Antenna assembly and electronic device

Abstract

Embodiments of the present application provide an antenna assembly and an electronic device, aiming at solving the problem that the antenna assembly exhibits poor antenna efficiency due to a pronounced dip in an antenna efficiency curve of the antenna assembly. The antenna assembly comprises: a floating stub, wherein the floating stub has a first open end and a second open end which are arranged opposite to each other, a feed point is further provided on the floating stub, and the feed point is located between the first open end and the second open end; and a matching circuit coupled to the feed point, wherein the matching circuit is configured to feed the feed point, so that the antenna assembly generates a first resonance and a second resonance, and the matching circuit comprises a first matching capacitor, wherein one end of the first matching capacitor is coupled to the feed point, and the other end of the first matching capacitor is configured to be grounded. The floating stub is weakly grounded by means of the first matching capacitor, so that a dip in an antenna efficiency curve is eliminated at the first resonance and the second resonance, thereby improving the communication performance of the antenna assembly.

Description

Antenna assembly and electronic device

[0001] This application claims priority to the Chinese Patent Application No. 202411392991.2, filed on September 30, 2024, and entitled "Antenna assembly and electronic device", the content of which is incorporated herein by reference in its entirety. This application also claims priority to the Chinese Patent Application No. 202411748783.1, filed on November 29, 2024, and entitled "Antenna assembly and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of communication technology, and in particular to an antenna assembly and an electronic device. BACKGROUND

[0003] Electronic devices (such as mobile phones, tablets, etc.) generally have an antenna assembly, which realizes wireless communication between the electronic device and a communication base station, a satellite, and the like. The antenna assembly includes an antenna branch and a ground plate, the antenna branch and the ground plate are arranged at intervals, the antenna branch is coupled between the ground plate through a grounding branch; a radio frequency device is used to couple a signal to a feed point on the antenna branch, so that the antenna assembly can produce a first resonance and a second resonance, the resonance frequency of the first resonance is less than the resonance frequency of the second resonance. However, the antenna branch has a current reversal point under the first resonance, which causes the antenna efficiency curve of the antenna assembly to have a significant dent, thereby causing the antenna efficiency of the antenna assembly to be poor, which affects the communication performance of the antenna assembly. SUMMARY

[0004] Embodiments of the present application provide an antenna assembly and an electronic device to eliminate or reduce the dent in the antenna efficiency curve of the antenna assembly, so as to improve the communication performance of the electronic device.

[0005] In a first aspect, an embodiment of the present application provides an antenna assembly, comprising: a ground plate, a floating branch, and a matching circuit, the floating branch is arranged at intervals with the ground plate, the floating branch comprises a first open end and a second open end arranged oppositely, and the floating branch further comprises a feed point, the feed point is located between the first open end and the second open end; the matching circuit is coupled with the feed point, and the matching circuit is used to feed the feed point, so that the antenna assembly produces a first resonance and a second resonance; the matching circuit comprises a first matching capacitor, one end of the first matching capacitor is coupled with the feed point, and the other end of the first matching capacitor is configured to be grounded.

[0006] Through the above arrangement, the floating branch is weakly grounded through the first matching capacitor, so as to reduce the coupling amount between the floating branches on both sides of the feeding point (weak coupling), and thus the currents on the floating branches are in the same direction under the first resonance and the second resonance, the current reverse point is eliminated, and thus the pits in the antenna efficiency curve are reduced or eliminated, and the communication performance of the antenna assembly is improved.

[0007] In some embodiments which can include the above embodiments, the distance between the feeding point and the midpoint of the floating branch along the extension direction of the floating branch is less than or equal to one fourth of the length of the floating branch along the extension direction of the floating branch, the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than or equal to 300 MHz, and thus the resonance frequency band of the first resonance and the resonance frequency band of the second resonance jointly cover the same communication frequency band. In this way, the bandwidth of the antenna assembly can be increased, and the communication performance of the antenna assembly can be improved.

[0008] In some embodiments which can include the above embodiments, the distance between the feeding point and the midpoint can be 2mm-6mm (such as 2mm, 4mm, 6mm, etc.), so as to avoid the distance between the feeding point and the midpoint being too large or too small while ensuring that the first resonance and the second resonance jointly cover the same communication frequency band. It can be understood that as the distance between the feeding point and the midpoint gradually increases, the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance gradually increases, and reasonable selection of the distance between the feeding point and the midpoint can ensure that the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is moderate.

[0009] In some embodiments which can include the above embodiments, the matching circuit further includes a first matching inductor, one end of the first matching inductor is coupled to one end of the first matching capacitor, the one end of the first matching inductor is also used to receive the radio frequency signal, and the other end of the first matching inductor is coupled to the feeding point. In this way, the antenna matching of the antenna assembly can be performed through the first matching inductor, and the performance of the antenna assembly can be improved.

[0010] In some embodiments which can comprise the above-mentioned embodiments, the distance between the feed point and the first open end is less than or equal to one fourth of the length of the floating stub along the extending direction thereof, and the frequency difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is greater than 300 MHz. The frequency difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is large, and the resonant frequency band of the first resonance and the resonant frequency band of the second resonance cover different communication frequency bands respectively, so that the antenna assembly can cover different communication frequency bands and increase the bandwidth of the antenna assembly. For example, the resonant frequency band of the first resonance covers a first communication frequency band, and the first communication frequency band can be a B1 frequency band (1920-1980 MHz) or a B3 frequency band (1710-1785 MHz); the resonant frequency band of the second resonance covers a second communication frequency band, and the second communication frequency band can be a B40 frequency band (2300-2400 MHz) or a B41 frequency band (2496-2690 MHz).

[0011] In some embodiments which can comprise the above-mentioned embodiments, the matching circuit further comprises a first matching inductor, one end of the first matching inductor is coupled to the other end of the first matching capacitor, and the other end of the first matching inductor is configured to be grounded; and the other end of the first matching capacitor is further configured to receive the radio frequency signal. In this way, the floating stub is weakly grounded through the first matching capacitor and the first matching inductor, so as to ensure that the currents on the floating stub under the first resonance and the second resonance are both unidirectional currents, while the first resonance and the second resonance cover different communication frequency bands, so as to avoid the occurrence of a notch in the antenna efficiency curve of the antenna assembly and improve the communication performance of the antenna assembly. In addition, the first matching inductor can be provided to achieve impedance matching of the antenna assembly.

[0012] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a first grounding capacitor, and the floating stub is provided with a first connection point, one end of the first grounding capacitor is coupled to the first connection point, and the other end of the first grounding capacitor is configured to be grounded. The shortest distance between the first connection point and the midpoint of the floating stub along the extending direction thereof is less than or equal to one eighth of the length of the floating stub along the extending direction thereof, and the shortest distance between the first connection point and the feed point is greater than or equal to 2 mm, so that the first connection point is arranged at the electric field reversal point on the floating stub under the first resonance and the second resonance, and the currents on the floating stub under the first resonance and the second resonance will not flow to the ground through the first grounding capacitor, thereby ensuring that the directions of the currents on the floating stub under the first resonance and the second resonance are the same and avoiding the occurrence of a current reversal point.

[0013] By providing the first grounding capacitor, the antenna assembly can generate a third resonance, the resonant frequency of the third resonance is greater than the first resonant frequency and the second resonant frequency, and the communication frequency band covered by the resonant frequency band of the third resonance can be different from the communication frequency bands covered by the first resonance and the second resonance, so as to further increase the bandwidth of the antenna assembly.

[0014] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a first tuning device, one end of the first tuning device is coupled with the second connection point on the floating branch, and the other end of the first tuning device is configured to be grounded; the distance between the second connection point and the first open end is 1 / 16-3 / 16 of the length of the floating branch along its extension direction, and since the signal under the second resonance is mainly radiated outward by the floating branch between the feeding point and the first open end, the first tuning device can adjust the resonance frequency of the second resonance. In this way, the resonance frequency of the second resonance can be adjusted by the first tuning device, and the communication frequency band covered by the second resonance frequency band is adjusted, so that the antenna assembly can adapt to different communication frequency bands.

[0015] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a second tuning device, one end of the second tuning device is coupled with the third connection point on the floating branch, and the other end of the second tuning device is configured to be grounded; the distance between the third connection point and the second open end is 1 / 16-3 / 16 of the length of the floating branch along its extension direction, and since the signal under the second resonance is mainly radiated outward by the floating branch between the feeding point and the first open end, the first tuning device can adjust the resonance frequency of the second resonance. In this way, the resonance frequency of the second resonance can be adjusted by the first tuning device, and the communication frequency band covered by the second resonance frequency band is adjusted, so that the antenna assembly can adapt to different communication frequency bands.

[0016] In some implementations, the antenna assembly can further comprise a first switching device, the first tuning device is coupled with the second connection point through the first switching device, and in this way, whether the first tuning device is coupled with the second connection point or not can be controlled by the first switching device, and thus the control of the second resonance frequency can be realized.

[0017] In some embodiments, the antenna assembly further comprises a second tuning device, one end of the second tuning device is coupled with the third connection point on the floating branch, and the other end of the second tuning device is configured to be grounded; the third connection point is arranged between the midpoint and the second open end, and since the signal under the first resonance is mainly radiated outward by the floating branch between the feeding point and the second open end, the second tuning device can adjust the resonance frequency of the first resonance. In this way, the resonance frequency of the first resonance can be adjusted by the second tuning device, and the communication frequency band covered by the first resonance frequency band is adjusted, so that the antenna assembly can adapt to different communication frequency bands.

[0018] In some implementations, the antenna assembly can further comprise a second switching device, the second tuning device is coupled with the third connection point through the second switching device, and in this way, whether the second tuning device is coupled with the third connection or not can be controlled by the second switching device, and thus the control of the first resonance frequency can be realized.

[0019] In some embodiments which can include the above embodiments, the antenna assembly further comprises a first ground branch and a first tuning device, one end of the first ground branch is between the first open end and the first gap, and the other end of the first ground branch is a ground end; for example, the first ground branch is arranged in parallel with the suspended branch, and one end of the first ground branch faces the first open end. One end of the first tuning device is coupled between the first open end and the other end of the first tuning device is coupled to one end of the first ground branch. The first tuning device can include a capacitor and / or an inductor, and embodiments of the present application do not limit the first tuning device. In some implementations, the first tuning device can also be coupled to the first ground branch through a first switching device, so as to control whether the first tuning device is coupled to the first ground branch through the first switching device.

[0020] For example, the length of the first ground branch along its extension direction is less than or equal to one fourth of the wavelength corresponding to the communication frequency, such as one sixth or one eighth of the wavelength corresponding to the communication frequency.

[0021] Through the above arrangement, under the first resonance and the second resonance, the antenna structure including the ground plate, the first ground branch, the first gap, and the suspended branch is a slot antenna, the current direction on the first ground branch is the same as the current direction on the suspended branch, so that the mode of the slot antenna is a CM mode, and under the second resonance, the signal of the antenna assembly is mainly radiated outward by the suspended branch between the feed point and the first open end, so as to increase the antenna efficiency and the bandwidth (efficiency bandwidth) of the antenna assembly under the second resonance, and also to adjust the resonance frequency of the second resonance.

[0022] In some embodiments which can include the above embodiments, the antenna assembly further comprises a second ground branch and a second tuning device, one end of the second ground branch is between the second open end and the second gap, and the other end of the second ground branch is a ground end; for example, the second ground branch is arranged in parallel with the suspended branch, and one end of the second ground branch faces the second open end. One end of the second tuning device is coupled between the second open end and the other end of the second tuning device is coupled to one end of the second ground branch. The second tuning device can include a capacitor and / or an inductor, and embodiments of the present application do not limit the second tuning device. In some implementations, the second tuning device can also be coupled to the second ground branch through a second switching device, so as to control whether the second tuning device is connected to the second ground branch through the second switching device.

[0023] For example, the length of the second ground branch along its extension direction is less than or equal to one fourth of the wavelength corresponding to the communication frequency, such as one sixth or one eighth of the wavelength corresponding to the communication frequency.

[0024] Through the above arrangement, under the first resonance and the second resonance, the antenna structure including the floor, the second ground branch, the second gap and the floating branch is a slot antenna, the current direction on the second ground branch is the same as the current direction on the floating branch, so that the mode of the slot antenna is a CM mode; and under the first resonance, the signal of the antenna assembly is mainly radiated outward by the floating branch between the feeding point and the second open end, so that the efficiency bandwidth of the antenna assembly under the first resonance can be increased, and the resonant frequency of the first resonance can also be adjusted.

[0025] In some embodiments which can include the above embodiments, the first ground branch and the second ground branch are arranged in parallel, the floating branch is parallel to the first ground branch and the second ground branch, and the floating branch is arranged to be spaced from the first ground branch and the second ground branch, and the first ground branch and the second ground branch have a third gap therebetween. That is, the floating branch can be arranged between the first ground branch and the second ground branch and the floor, or the floating branch is arranged on the side of the first ground branch and the second ground branch away from the floor, and the embodiments of the present application do not limit this. In this way, the floating branch can be arranged on the inner side or the outer side of the first ground branch and the second ground branch, so that the size of the antenna assembly along the extension direction of the floating branch can be reduced, and the miniaturization of the antenna assembly can be realized.

[0026] In some embodiments which can include the above embodiments, the first ground branch includes a first branch, a second branch and a third branch, the first branch is parallel to the floating branch, and the first branch has a first gap between one end of the first branch and the first open end; one end of the second branch is coupled to the other end of the first branch, and the other end of the second branch is a ground end; the third branch is parallel to the floating branch, the first branch is located between the third branch and the floating branch, one end of the third branch is coupled to the other end of the second branch, and the other end of the third branch is an open end; the antenna assembly further includes a third tuning device, one end of the third tuning device is coupled to the third branch, and the other end of the third tuning device is configured to be grounded.

[0027] The third branch can improve the efficiency bandwidth of the second resonance, thereby improving the performance of the antenna assembly. The third tuning device can tune the second resonance.

[0028] In some embodiments which can include the above embodiments, the second ground branch includes a fourth branch, a fifth branch and a sixth branch, wherein the fourth branch is parallel to the floating branch, and the fourth branch has a second gap between one end of the fourth branch and the second open end; one end of the fifth branch is coupled to the other end of the fourth branch, and the other end of the fifth branch is a ground end; one end of the fifth branch is coupled to the fourth branch, and the other end of the fifth branch is coupled to the floor; the sixth branch is parallel to the floating branch, the fourth branch is located between the sixth branch and the floating branch, one end of the sixth branch is coupled to the other end of the fifth branch, and the other end of the sixth branch is an open end.

[0029] The sixth branch can improve the efficiency bandwidth of the first resonance, thereby improving the performance of the antenna assembly. The fourth tuning device can tune the first resonance.

[0030] In some embodiments, which can include the above-mentioned embodiments, the antenna assembly further comprises a second matching inductor, one end of the second matching inductor being coupled to one end of the first ground branch, and the other end of the second matching inductor being coupled to one end of the second ground branch. The second matching inductor can achieve antenna matching of the antenna assembly, and in addition, the second matching inductor can also adjust the coupling amount between the first ground branch and the second ground branch, achieve weak coupling, and further eliminate or reduce the efficiency dip.

[0031] When the width of the third gap is small, the third gap and the branches on both sides are equivalent to a capacitance, and at this time, the second matching inductor can be provided to reduce the coupling amount between the first ground branch and the second ground branch, to achieve weak coupling. When the width of the third gap is large, the third gap and the branches on both sides are equivalent to an inductance, and at this time, the coupling amount between the first ground branch and the second ground branch is small, and the second matching inductor can not be provided.

[0032] In a second aspect, the embodiments of the present application provide an antenna assembly, comprising: a ground plate, a first branch, a second branch, and a matching circuit; the first branch is spaced apart from the ground plate, and the first branch comprises a first open end and a first ground end; the second branch is spaced apart from the ground plate, and the second branch comprises a second open end and a second ground end, and the first open end and the second open end have a first gap therebetween; the matching circuit is coupled to the first open end and the second open end, and the matching circuit feeds signals to the first open end and the second open end in the form of anti-symmetrical feeding, so that the antenna assembly generates a first resonance and a second resonance; the matching circuit comprises a first inductor, one end of the first inductor being coupled to the first open end, and the other end of the first inductor being coupled to the second open end.

[0033] Through the above-mentioned arrangement, the coupling amount between the first branch and the second branch can be small (weak coupling), and thus the magnetic current directions on the first branch and the second branch can be the same under the first resonance, i.e., the mode of the antenna assembly is a DM mode (slot DM mode). Similarly, the magnetic current directions on the first branch and the second branch can be the same under the second resonance, i.e., the mode of the antenna assembly is a DM mode (slot DM mode). Since the magnetic current directions on the first branch and the second branch are the same under the first resonance and the second resonance, the dip in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, thereby improving the communication performance of the antenna assembly.

[0034] In some embodiments which can comprise the above-mentioned embodiments, the first branch and the second branch can have different lengths, the length of the first branch can be less than the length of the second branch, or the length of the first branch can be greater than the length of the second branch, and the present embodiments are not limited in this regard. In the implementation where the length of the first branch is less than the length of the second branch, the difference between the length of the first branch and the length of the second branch can be 2mm-6mm (such as 2mm, 4mm, 6mm, etc.). It can be understood that, as the length of the first branch gradually increases, the resonant frequency of the second resonance gradually decreases; as the length of the second branch gradually increases, the resonant frequency of the first resonance gradually decreases.

[0035] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a first capacitor, one end of the first capacitor is coupled to the first open end, and the other end of the first capacitor is coupled to the second open end, and impedance matching of the antenna assembly can be achieved through the first capacitor.

[0036] In a third aspect, the present embodiments further provide an antenna assembly, comprising: a ground plate, a first branch and a second branch which are spaced apart from the ground plate, the first branch comprising a first open end and a first ground end, the second branch comprising a second open end and a second ground end, the first open end and the second open end having a first gap therebetween; and a matching circuit coupled to the first open end and the second open end, the matching circuit feeding signals to the first open end and the second open end in the form of anti-symmetrical feeding, so that the antenna assembly generates a first resonance and a second resonance; the matching circuit comprising a first capacitor, one end of the first capacitor being coupled to the first open end, and the other end of the first capacitor being coupled to the second open end.

[0037] Through the above arrangement, the coupling amount between the first branch and the second branch can be small (weak coupling), and thus the magnetic current directions on the first branch and the second branch can be the same at the first resonance, i.e., the mode of the antenna assembly is DM mode (slot DM mode); similarly, the magnetic current directions on the first branch and the second branch can be the same at the second resonance, i.e., the mode of the antenna assembly is DM mode (slot DM mode). Since the magnetic current directions on the first branch and the second branch are the same at the first resonance and the second resonance, the dips in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, and thus the communication performance of the antenna assembly can be improved.

[0038] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a first inductor, one end of the first inductor is coupled to the first open end, and the other end of the first inductor is coupled to the second open end, and impedance matching of the antenna assembly can be achieved through the first inductor.

[0039] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a first tuning device, one end of the first tuning device is coupled with the first branch, and the other end of the first tuning device is configured to be grounded, and the first tuning device is used to adjust the resonant frequency of the second resonance. In this way, the resonant frequency of the second resonance can be adjusted by the first tuning device, and the communication frequency band covered by the second resonant frequency band is adjusted, so that the antenna assembly can adapt to different communication frequency bands.

[0040] In some implementations, the antenna assembly can further comprise a first switching device, and the first tuning device is coupled with the first branch through the first switching device. In this way, whether the first tuning device is coupled with the first branch can be controlled by the first switching device, and thus the control of the second resonant frequency can be realized.

[0041] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a second tuning device, one end of the second tuning device is coupled with the second branch, and the other end of the second tuning device is configured to be grounded, and the second tuning device is used to adjust the resonant frequency of the first resonance. In this way, the resonant frequency of the first resonance can be adjusted by the second tuning device, and the communication frequency band covered by the first resonant frequency band is adjusted, so that the antenna assembly can adapt to different communication frequency bands.

[0042] In some implementations, the antenna assembly can further comprise a second switching device, and the second tuning device is coupled with the second branch through the second switching device. In this way, whether the second tuning device is coupled with the second branch can be controlled by the second switching device, and thus the control of the first resonant frequency can be realized.

[0043] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a second inductor and a third branch, and the first ground end is grounded through the second inductor; one end of the third branch is coupled with the first ground end, and the other end of the third branch is an open end. In this way, under the first resonance and the second resonance, the magnetic current direction on the third branch is the same as the magnetic current direction on the first branch, which can improve the efficiency bandwidth of the antenna assembly. It can be understood that, since the signal under the second resonance is mainly radiated outward by the first branch, the efficiency bandwidth of the second resonance can be significantly improved by setting the third branch; in addition, the resonant frequency of the second resonance can be changed by adjusting the inductance value of the second inductor, and as the inductance value of the second inductor gradually increases, the resonant frequency of the second resonance gradually decreases.

[0044] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a third inductor and a fourth stub, the second ground end is grounded through the third inductor; one end of the fourth stub is coupled with the second ground end, and the other end of the fourth stub is an open end. In this way, under the first resonance and the second resonance, the direction of the magnetic current on the fourth stub is the same as that on the second stub, which can improve the efficiency bandwidth of the antenna assembly. It can be understood that, since the signal under the first resonance is mainly radiated outward by the second stub, the fourth stub can significantly improve the efficiency bandwidth of the first resonance; in addition, by adjusting the inductance value of the third inductor, the resonant frequency of the first resonance can be changed, and as the inductance value of the third inductor gradually increases, the resonant frequency of the first resonance gradually decreases.

[0045] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a third tuning device, one end of the third tuning device is coupled with the third stub, and the other end of the third tuning device is configured to be grounded, and the third tuning device is used to adjust the resonant frequency of the second resonance. In this way, the resonant frequency of the first resonance is adjusted, and the communication frequency of the antenna assembly can be adjusted.

[0046] In some embodiments which can include the above-mentioned embodiments, the antenna assembly further comprises a fourth tuning device, one end of the fourth tuning device is coupled with the fourth stub, and the other end of the fourth tuning device is configured to be grounded, and since the signal under the first resonance is mainly radiated outward by the second stub coupled with the fourth stub, the fourth tuning device can be arranged to adjust the resonant frequency of the second resonance. In this way, the resonant frequency of the second resonance is adjusted, and the communication frequency of the antenna assembly can be adjusted.

[0047] In some embodiments which can include the above-mentioned embodiments, the antenna assembly comprises a third tuning device and a fourth tuning device, one end of the third tuning device is coupled with the first stub, and the other end of the third tuning device is configured to be grounded, one end of the fourth tuning device is coupled with the second stub, and the other end of the fourth tuning device is configured to be grounded. In this way, the resonant frequency of the second resonance can be adjusted by the third tuning device, and the resonant frequency of the first resonance can be adjusted by the fourth tuning device.

[0048] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a fifth branch and a fifth tuning device, the fifth branch is arranged on the side of the third branch away from the first branch, and the fifth branch has a second gap between one end of the fifth branch and the other end of the third branch; one end of the fifth tuning device is coupled with the fifth branch, and the other end of the fifth tuning device is configured to be grounded, and the fifth tuning device is used to adjust the resonant frequency of the second resonance. In this way, under the first resonance and the second resonance, the direction of the magnetic current on the fifth branch is the same as the direction of the magnetic current on the first branch and the third branch, which can improve the efficiency bandwidth of the antenna assembly. It can be understood that, since the signal under the second resonance is mainly radiated outward by the first branch, the arrangement of the fifth branch can significantly improve the efficiency bandwidth of the second resonance; in addition, the resonant frequency of the second resonance can be adjusted by the fifth tuning device.

[0049] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a sixth branch and a sixth tuning device, the sixth branch is arranged on the side of the fourth branch away from the second branch, and the sixth branch has a third gap between one end of the sixth branch and the other end of the fourth branch; one end of the sixth tuning device is coupled with the sixth branch, and the other end of the sixth tuning device is configured to be grounded, and the sixth tuning device is used to adjust the resonant frequency of the first resonance. In this way, under the first resonance and the second resonance, the direction of the magnetic current on the sixth branch is the same as the direction of the magnetic current on the second branch and the fourth branch, which can improve the efficiency bandwidth of the antenna assembly. It can be understood that, since the signal under the first resonance is mainly radiated outward by the second branch, the arrangement of the sixth branch can significantly improve the efficiency bandwidth of the first resonance; in addition, the resonant frequency of the first resonance can be adjusted by the sixth tuning device.

[0050] In some embodiments which can comprise the above-mentioned embodiments, the other end of the fifth branch is an open end or a grounded end.

[0051] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a sixth tuning device, under the first resonance and the second resonance, the second branch has a current minimum point, and a break is arranged at the current minimum point; the second branch on both sides of the break is coupled by the sixth tuning device. In this way, the antenna assembly can also excite a third resonance, the resonant frequency of the third resonance can be higher than the resonant frequency of the first resonance and the resonant frequency of the second resonance, the mode of the third resonance can be a CM mode, the third resonance can cover the same communication frequency band as the first resonance and / or the second resonance, or the third resonance covers a different communication frequency band from the first resonance and the second resonance, thereby increasing the bandwidth of the antenna assembly.

[0052] In a fourth aspect, the embodiments of the present application further provide an antenna assembly, comprising: a ground plane, a first branch, a second branch, and a matching circuit, the first branch comprising a first ground terminal and a second ground terminal arranged oppositely; the second branch is arranged spaced apart from the first branch, and the first branch has a first connection point and a second connection point arranged spaced apart along a length direction thereof, one end of the second branch is coupled to the first connection point, and the other end of the second branch is coupled to the second connection point; the second branch is provided with a first slot; the matching circuit is coupled to the second branch on both sides of the first slot, and the matching circuit feeds signals to the second branch on both sides of the first slot in an anti-symmetrical feeding mode, so that the antenna assembly generates a first resonance and a second resonance; and the matching circuit comprises a first capacitor, and the second branch on both sides of the first slot is coupled through the first capacitor.

[0053] Through the above arrangement, the first capacitor can make the coupling amount between the first branch and the second branch smaller (weak coupling), and thus can make the magnetic current directions on the first branch and the second branch the same under the first resonance, i.e., the mode of the antenna assembly is DM mode (slot DM mode); similarly, the magnetic current directions on the first branch and the second branch are the same under the second resonance, i.e., the mode of the antenna assembly is DM mode (slot DM mode). Since the magnetic current directions on the first branch and the second branch are the same under the first resonance and the second resonance, the dips in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, and thus the communication performance of the antenna assembly can be improved.

[0054] In some embodiments which can comprise the above embodiments, the antenna assembly further comprises a first inductor, one end of the first inductor is coupled to the second branch on one side of the first slot, and the other end of the first inductor is coupled to the second branch on the other side of the first slot, and impedance matching of the antenna assembly can be achieved.

[0055] In some embodiments which can comprise the above embodiments, the antenna assembly further comprises a first tuning device, one end of the first tuning device is coupled to the second ground terminal, and the other end of the first tuning device is grounded; and the first tuning device is used to adjust the resonance frequency of the second resonance. The resonance frequency of the second resonance can be adjusted through the first tuning device, and thus the corresponding communication frequency band of the second resonance can be adjusted. Exemplarily, the first tuning device can comprise a capacitor and / or an inductor, and the embodiments of the present application do not limit the first tuning device. When the resonance frequency of the second resonance is adjusted, the resonance frequency of the first resonance hardly changes, and in the implementation manner in which the first tuning device is an inductor, the resonance frequency of the second resonance can be reduced by increasing the inductance value of the first tuning device.

[0056] And / or, the antenna assembly further comprises a second tuning device, one end of the second tuning device is coupled with the first ground end, and the other end of the second tuning device is grounded; the second tuning device is used to adjust the resonant frequency of the first resonance. The resonant frequency of the first resonance can be adjusted through the second tuning device, and then the corresponding communication frequency band of the first resonance can be adjusted. Exemplarily, the second tuning device can comprise a capacitance and / or an inductance, and the embodiments of the present application do not limit the second tuning device. When the resonant frequency of the first resonance is adjusted, the resonant frequency of the second resonance hardly changes, and in the implementation manner in which the second tuning device is a capacitance, the resonant frequency of the first resonance can be reduced by increasing the capacitance value of the first tuning device.

[0057] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a first connecting branch, the first connecting branch is arranged in parallel with the first branch, one end of the first connecting branch close to the first ground end is coupled with the first ground end, and the other end of the first connecting branch is an open end; the efficiency bandwidth of the second resonance can be adjusted through the first connecting branch.

[0058] And / or, the antenna assembly further comprises a second connecting branch, the second connecting branch is arranged in parallel with the second branch, one end of the second connecting branch close to the second ground end is coupled with the second ground end, and the other end of the second connecting branch is an open end; the efficiency bandwidth of the first resonance can be adjusted through the second connecting branch.

[0059] In the fifth aspect, the embodiments of the present application further provide an antenna assembly, comprising: a ground plate, a first branch, a second branch, a feeding structure, and a first capacitance, the first branch and the second branch are arranged in parallel, the first branch comprises a first ground end and a first open end arranged oppositely, the second branch comprises a second ground end and a second open end arranged oppositely, and the first ground end is arranged to face the second ground end; the feeding structure feeds the first branch and the second branch in the form of anti-symmetrical feeding, so that the antenna assembly generates a first resonance and a second resonance; one end of the first capacitance is coupled with the first ground end, and the other end of the first capacitance is coupled with the second ground end.

[0060] By arranging the first capacitance, the coupling amount between the first branch and the second branch can be small (weak coupling), and then the magnetic current directions on the first branch and the second branch under the first resonance can be the same; similarly, the magnetic current directions on the first branch and the second branch under the second resonance can be the same. Since the magnetic current directions on the first branch and the second branch under the first resonance and the second resonance are the same, the dips in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, and then the communication performance of the antenna assembly can be improved.

[0061] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a ground branch, one end of the ground branch is coupled with the first ground end and the second ground end, and the other end of the ground branch is grounded. In this way, the first ground end and the second ground end are grounded through the same ground branch, which can simplify the structure of the antenna assembly and facilitate the manufacture of the antenna assembly.

[0062] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a first ground branch and a second ground branch, the first ground end and the second ground end are spaced apart, one end of the first ground branch is coupled with the first ground end, and the other end of the first ground branch is grounded, one end of the second ground branch is coupled with the second ground end, and the other end of the second ground branch is grounded. In this way, the first ground end is grounded through the first ground branch, and the second ground end is grounded through the second ground branch, and the distance between the first branch and the second branch can be adjusted by adjusting the positions of the first ground branch and the second ground branch.

[0063] In some embodiments which can comprise the above-mentioned embodiments, the feeding structure comprises a matching circuit, the matching circuit comprises a first inductor, one end of the first inductor is coupled with the first ground end, and the other end of the first inductor is coupled with the second ground end. The impedance matching of the antenna assembly can be achieved through the first inductor.

[0064] In some embodiments which can comprise the above-mentioned embodiments, the feeding structure comprises a floating branch and a matching circuit, the floating branch is parallel to and spaced apart from the first branch and the second branch, one end of the floating branch is coupled with the first ground end, and the other end of the floating branch is coupled with the second ground branch; the floating branch is provided with a first gap, and the matching circuit feeds signals to the floating branch on both sides of the first gap in the form of anti-symmetrical feeding. By feeding the first branch and the second branch through the floating branch, the difference (frequency ratio) between the resonant frequency of the first resonance and the resonant frequency of the second resonance can be further adjusted by adjusting the feeding position on the floating branch.

[0065] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a first tuning device, one end of the floating branch is coupled with the first ground end through the first tuning device; in this way, the coupling amount of the first branch and the second branch can be adjusted through the first tuning device, and the impedance matching of the antenna assembly can also be achieved. Exemplarily, the first tuning device can comprise a capacitor and / or an inductor, and the embodiments of the present application do not limit the first tuning device.

[0066] And / or, the antenna assembly further comprises a second tuning device, the other end of the floating branch is coupled with a second ground end through the second tuning device. In this way, the coupling amount of the first branch and the second branch can be adjusted through the second tuning device, and meanwhile the impedance matching of the antenna assembly can be realized. Exemplarily, the second tuning device can comprise a capacitance and / or an inductance, and the embodiments of the present application do not limit the second tuning device.

[0067] In some embodiments which can comprise the above-mentioned embodiments, the antenna assembly further comprises a first parasitic branch and a third tuning device, the first parasitic branch is arranged on the side of the first branch away from the second branch, and the first parasitic branch is arranged in parallel with the first branch; the first parasitic branch and the first open end have a second gap therebetween, one end of the third tuning device is coupled with the first parasitic branch, and the other end of the third tuning device is grounded; the first branch can couple signals to the first parasitic branch, thereby adjusting the efficiency bandwidth of the second resonance.

[0068] And / or, the antenna assembly further comprises a second parasitic branch and a fourth tuning device, the second parasitic branch is arranged on the side of the second branch away from the first branch, and the second parasitic branch is arranged in parallel with the second branch; the second parasitic branch and the second open end have a third gap therebetween, one end of the fourth tuning device is coupled with the second parasitic branch, and the other end of the fourth tuning device is grounded. The second branch can couple signals to the second parasitic branch, thereby adjusting the efficiency bandwidth of the first resonance.

[0069] In a sixth aspect, the embodiments of the present application further provide an electronic device, comprising: a radio frequency device and an antenna assembly as described above, the radio frequency device being coupled with the matching circuit.

[0070] The electronic device in the embodiments of the present application comprises the antenna assembly in any of the above-mentioned embodiments, and thus the same technical effects can be achieved, and the same technical problems can be solved, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0071] FIG. 1 is a structural schematic diagram of an electronic device provided by the embodiments of the present application;

[0072] FIG. 2 is a structural schematic diagram of an antenna assembly in the related art;

[0073] FIG. 3 is a return loss curve diagram of the antenna assembly shown in FIG. 2;

[0074] FIG. 4 is a current schematic diagram of the antenna assembly shown in FIG. 2 at the first resonance;

[0075] FIG. 5 is a current schematic diagram of the antenna assembly shown in FIG. 2 at the second resonance;

[0076] FIG. 6 is an antenna efficiency diagram of the antenna assembly shown in FIG. 2;

[0077] FIG. 7 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0078] FIG. 8 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0079] FIG. 9 is a return loss curve of the antenna assembly shown in FIG. 8;

[0080] FIG. 10 is an antenna efficiency diagram of the antenna assembly shown in FIG. 8;

[0081] FIG. 11 is a current schematic diagram of the antenna assembly shown in FIG. 8 at a first resonance;

[0082] FIG. 12 is a current schematic diagram of the antenna assembly shown in FIG. 8 at a second resonance;

[0083] FIG. 13 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0084] FIG. 14 is a current schematic diagram of the antenna assembly shown in FIG. 13 at a first resonance;

[0085] FIG. 15 is a current schematic diagram of the antenna assembly shown in FIG. 13 at a second resonance;

[0086] FIG. 16 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0087] FIG. 17 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0088] FIG. 18 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0089] FIG. 19 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0090] FIG. 20 is a return loss curve of an antenna assembly according to an embodiment of the present application when first and second tuning devices are in different states;

[0091] FIG. 21 is an antenna efficiency diagram of an antenna assembly according to an embodiment of the present application when first and second tuning devices are in different states;

[0092] FIG. 22 is a return loss curve of an antenna assembly according to an embodiment of the present application when first and second tuning devices are in different states;

[0093] FIG. 23 is an antenna efficiency diagram of an antenna assembly according to an embodiment of the present application when first and second tuning devices are in different states;

[0094] FIG. 24 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0095] FIG. 25 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0096] FIG. 26 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0097] FIG. 27 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0098] FIG. 28 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0099] FIG. 29 is a return loss curve diagram of whether a first ground branch and a second ground branch are provided;

[0100] FIG. 30 is an antenna efficiency diagram of whether a first ground branch and a second ground branch are provided;

[0101] FIG. 31 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0102] FIG. 32a is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0103] FIG. 32b is a structural schematic diagram of an antenna assembly according to an embodiment of the present application, in which a second matching inductor is provided;

[0104] FIG. 33 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0105] FIG. 34 is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0106] FIG. 35a is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0107] FIG. 35b is a structural schematic diagram of an antenna assembly according to an embodiment of the present application, in which a first tuning device and a second tuning device are provided;

[0108] FIG. 35c is a return loss diagram of the first tuning device of the antenna assembly shown in FIG. 35b when the second tuning device is not provided and the inductance value of the first tuning device is different;

[0109] FIG. 35d is a return loss diagram of the second tuning device of the antenna assembly shown in FIG. 35b when the first tuning device is not provided and the capacitance value of the second tuning device is different;

[0110] FIG. 36a is a structural schematic diagram of an antenna assembly according to an embodiment of the present application;

[0111] FIG. 36b is a structural schematic diagram of an antenna assembly according to an embodiment of the present application, in which a matching circuit includes a first capacitor;

[0112] FIG. 36c is a structure diagram of an antenna assembly provided by the embodiment of the present application, in which a first tuning device and a second tuning device are arranged;

[0113] FIG. 36d is a structure diagram of an antenna assembly provided by the embodiment of the present application, in which a sixth tuning device is arranged;

[0114] FIG. 37 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0115] FIG. 38 is a return loss curve diagram of the antenna assembly shown in FIG. 37;

[0116] FIG. 39 is an antenna efficiency curve diagram of the antenna assembly shown in FIG. 37;

[0117] FIG. 40 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0118] FIG. 41 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0119] FIG. 42 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0120] FIG. 43 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0121] FIG. 44 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0122] FIG. 45 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0123] FIG. 46 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0124] FIG. 47 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0125] FIG. 48 is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0126] FIG. 49a is a structure diagram of an antenna assembly provided by the embodiment of the present application;

[0127] FIG. 49b is a structure diagram of an antenna assembly provided by the embodiment of the present application, in which a first tuning device and a second tuning device are arranged;

[0128] FIG. 49c is a return loss diagram of the antenna assembly shown in FIG. 49b, in which the first tuning device is not arranged, and the capacitance values of the first tuning device are different;

[0129] FIG. 49d is a return loss diagram of the antenna assembly shown in FIG. 49b, in which the first tuning device is not arranged, and the inductance values of the second tuning device are different.

[0130] Fig. 50 is a schematic diagram of a thirtyth structure of an antenna assembly according to an embodiment of the application;

[0131] Fig. 51 is a schematic diagram of a thirtyfirst structure of an antenna assembly according to an embodiment of the application;

[0132] Fig. 52a is a schematic diagram of a thirtysecond structure of an antenna assembly according to an embodiment of the application;

[0133] Fig. 52b is a schematic diagram of the thirtysecond structure of the antenna assembly provided with a first tuning device and a second tuning device according to an embodiment of the application;

[0134] Fig. 52c is a return loss diagram of the thirtysecond structure of the antenna assembly shown in Fig. 52b without the second tuning device and with different inductance values of the first tuning device;

[0135] Fig. 52d is a return loss diagram of the thirtysecond structure of the antenna assembly shown in Fig. 52b without the first tuning device and with different capacitance values of the second tuning device;

[0136] Fig. 53 is a schematic diagram of a thirtythird structure of an antenna assembly according to an embodiment of the application;

[0137] Fig. 54 is a schematic diagram of a thirtyfourth structure of an antenna assembly according to an embodiment of the application;

[0138] Fig. 55 is a schematic diagram of an antenna structure corresponding to a line common mode;

[0139] Fig. 56 is a current and electric field distribution diagram of the antenna structure shown in Fig. 55;

[0140] Fig. 57 is a schematic diagram of an antenna structure corresponding to a line differential mode;

[0141] Fig. 58 is a current and electric field distribution diagram of the antenna structure shown in Fig. 57;

[0142] Fig. 59 is a schematic diagram of an antenna structure corresponding to a slot common mode;

[0143] Fig. 60 is a current and electric field distribution diagram of the antenna structure shown in Fig. 59;

[0144] Fig. 61 is a schematic diagram of an antenna structure corresponding to a slot differential mode;

[0145] Fig. 62 is a current and electric field distribution diagram of the antenna structure shown in Fig. 61.

[0146] Explanation of reference signs: 10: electronic device; 110: middle frame; 111: middle plate; 112: frame; 113: first frame; 114: second frame; 115: third frame; 120: display panel; 130: mainboard; 201: antenna branch; 202: ground plate; 203: ground branch; a: feeding point; 204: capacitance structure; 205: floating branch; 2051: first open end; 2052: second open end; 206: matching circuit; 2061: first matching capacitance; 2062: first matching inductance; 2063: second matching capacitance; 2064: first capacitance; 2065: first inductance; 2066: second matching inductance; 207: first ground capacitance; b: first connecting point; 208: first tuning device; 209: second tuning device; 210: first ground branch; 2101: first branch; 2102: second branch; 2103: third branch; 211: first slit; 212: second ground branch; 2121: fourth branch; 2122: fifth branch; 2123: sixth branch; 213: second slit; 214: third slit; 215: third tuning device; 216: fourth tuning device; 2105: first ground end; 2107: second ground end; 217: second inductance; 218: third inductance; 222: fifth tuning device; 224: sixth tuning device; 225: break; 226: first connecting branch; 227: second connecting branch; 228: first parasitic branch; 229: second parasitic branch; 230: first tuning arrangement; 231: second tuning arrangement. DETAILED DESCRIPTION

[0147] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0148] Hereinafter, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features.

[0149] In addition, in the embodiments of the present application, the orientation terms "upper", "lower", "left", "right", "horizontal", and "vertical" are defined with respect to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0150] Hereinafter, the terms that may appear in the embodiments of the present application are explained.

[0151] Connect / connected: should be understood in a broad sense, for example, "connected" can be fixed connection, electrical connection, or detachable connection, or integrated; can be directly connected, or indirectly connected through intermediate media.

[0152] Coupling: can be understood as direct coupling and / or indirect coupling, "coupling connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be referred to as "electrical connection", which means that the components are in physical contact and electrically conductive; it can also be understood as the form of connection between different components in the circuit structure through the entity circuit of the copper foil or wire of the printed circuit board (PCB) that can transmit electrical signals; "indirect coupling" can be understood as the electrical conduction of two conductors through space / non-contact. In an embodiment, indirect coupling can also be referred to as capacitive coupling, for example, through the coupling between the gap between two conductive parts to form an equivalent capacitor to realize signal transmission.

[0153] Opposite / relative arrangement: A and B opposite arrangement can mean that A and B are arranged face to face (opposite or face to face). For example, when two radiators are arranged opposite to each other, the two radiators are arranged with at least part of the area overlapping in a certain direction. In an embodiment, the two radiators arranged opposite to each other are arranged adjacent to each other without arranging other radiators therebetween, and no conductive body other than the antenna structure is arranged therebetween.

[0154] Lumped element / device: refers to the collective name of elements whose size is much smaller than the relative wavelength of the circuit operating frequency. For signals, at any time, the characteristics of the element remain fixed and are independent of frequency.

[0155] Distributed element / device: unlike lumped elements, if the size of the element is similar to or larger than the relative wavelength of the circuit operating frequency, then when the signal passes through the element, the characteristics of each point in the element will be different due to the change of the signal, and at this time the element as a whole cannot be regarded as a single body with fixed characteristics, but should be called a distributed element.

[0156] Capacitance / capacitive structure: can be understood as lumped capacitance and / or distributed capacitance. Lumped capacitance refers to capacitive components, such as capacitive elements; distributed capacitance (or distributed capacitance) refers to the equivalent capacitance formed by spacing a certain gap between two conductive parts.

[0157] Inductance / inductive structure: can be understood as lumped inductance and / or distributed inductance. Lumped inductance refers to inductive components, such as inductive elements; distributed inductance (or distributed inductance) refers to the equivalent inductance formed by a certain length of conductive part, such as the equivalent inductance formed by the curling or rotation of the conductor.

[0158] Radiating element, or antenna element: a device in an antenna for receiving / transmitting electromagnetic wave radiation. In some cases, "antenna" is understood in a narrow sense as a radiating element, which converts guided wave energy from a transmitter into radio waves, or converts radio waves into guided wave energy for radiation and reception of radio waves. The modulated high frequency current energy (or guided wave energy) generated by the transmitter is delivered to the transmitting radiating element via feed lines, which converts it into some polarized electromagnetic wave energy and radiates it in the desired direction. The receiving radiating element converts the electromagnetic wave energy from a certain polarization in a certain direction into modulated high frequency current energy, which is delivered to the input terminal of the receiver via the feed line.

[0159] The radiating element (or antenna element) can include a conductor with a certain shape and size, such as a wire, or a patch, etc., which is not limited in the specific shape. In an embodiment, the wire radiating element can be referred to as a wire antenna. In an embodiment, the wire radiating element can be implemented by a conductive frame, which can also be referred to as a frame antenna. In an embodiment, the wire radiating element can be implemented by a bracket conductor, which can also be referred to as a bracket antenna. In an embodiment, the wire radiating element, or the wire diameter (e.g., including thickness and width) of the radiating element of the wire antenna is much smaller (e.g., less than 1 / 16 of the wavelength) than the wavelength (e.g., the medium wavelength), and the length can be comparable to the wavelength (e.g., the length is around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). The main forms of wire antennas include dipole antennas, half-wave dipole antennas, monopole antennas, loop antennas, inverted F antennas (also referred to as IFA, Inverted F Antenna). For example, for a dipole antenna, each dipole antenna generally includes two radiating elements, each of which is fed by a feed from the feed end of the radiating element. For example, the inverted F antenna (Inverted-F Antenna, IFA) can be regarded as an inverted F antenna obtained by adding a ground path to a monopole antenna. The IFA antenna has a feed point and a ground point, and is called an inverted F antenna because its side view is in the shape of an inverted F. In an embodiment, the patch radiating element can include a microstrip antenna, or a patch antenna, such as a planar inverted F antenna (also referred to as PIFA, Planar Inverted F Antenna). In an embodiment, the patch radiating element can be implemented by a planar conductor (e.g., a conductive patch or a conductive coating, etc.). In an embodiment, the patch radiating element can include a conductive patch, such as a copper patch, etc. In an embodiment, the patch radiating element can include a conductive coating, such as silver paste, etc. The shape of the patch radiating element includes a circle, a rectangle, a ring, etc., which is not limited in the specific shape. The structure of the microstrip antenna is generally composed of a dielectric substrate, a radiating element, and a ground plate, wherein the dielectric substrate is arranged between the radiating element and the ground plate.

[0160] The radiators (or antenna elements) can also include slots or gaps formed on the conductors, for example, closed or semi-closed slots or gaps formed on the grounded conductor plane. In one embodiment, the slotted or gapped radiators can be referred to as slot antennas or gap antennas. In one embodiment, the slots or gaps of the slot antennas / gap antennas have a radial dimension (e.g., including width) much smaller than the wavelength (e.g., dielectric wavelength) (e.g., less than 1 / 16 of the wavelength), and a length dimension comparable to the wavelength (e.g., dielectric wavelength) (e.g., around 1 / 8 of the wavelength, or 1 / 8 to 1 / 4, or 1 / 4 to 1 / 2, or longer). In one embodiment, the radiators with closed slots or gaps can be referred to as closed slot antennas. In one embodiment, the radiators with semi-closed slots or gaps (e.g., with openings added to the closed slots or gaps) can be referred to as open slot antennas. In some embodiments, the gap shape is long and thin. In some embodiments, the length of the gap is about half a wavelength (e.g., dielectric wavelength). In some embodiments, the length of the gap is about an integer number of wavelengths (e.g., one dielectric wavelength). In some embodiments, the gap can be fed by a transmission line bridging one or both sides of the gap, whereby a radio frequency electromagnetic field is excited on the gap and electromagnetic waves are radiated into space. In one embodiment, the radiators of the slot antennas or gap antennas can be implemented by conductive frames grounded at both ends, which can also be referred to as frame antennas; in this embodiment, the slot antennas or gap antennas can be considered to include linear radiators spaced apart from the ground plane and grounded at both ends, thereby forming closed or semi-closed slots or gaps. In one embodiment, the radiators of the slot antennas or gap antennas can be implemented by bracket conductors grounded at both ends, which can also be referred to as bracket antennas.

[0161] The feed circuit / structure is a combination of all components of an antenna for the purpose of reception and transmission of radio waves. In the case of a receiving antenna, the feed circuit can be considered as the antenna part from the first amplifier to the front-end transmitter. In a transmitting antenna, the feed circuit can be considered as the part after the last power amplifier. In some cases, the "feed circuit" is understood in a narrow sense as the radio frequency chip, or the transmission path including the radio frequency chip to the feed point on the radiator or transmission line. The feed circuit has the function of converting radio waves into electrical signals and sending them to the receiver components. In general, it is considered as part of the antenna for converting radio waves into electrical signals and vice versa. The antenna should be designed to maximize the possibility of power transmission and efficiency. To this end, the antenna feed impedance must be matched to the load resistance. The antenna feed impedance is a combination of resistance, capacitance, and inductance. To ensure maximum power transfer conditions, the two impedances (load resistance and feed impedance) should be matched. The matching can be done by considering the frequency requirements and the design parameters of the antenna (such as gain, directivity, and radiation efficiency).

[0162] Ground / Ground Plate: Refers to at least one part of any ground layer, or ground plate, or ground metal layer, or any combination of the above in an electronic device (such as a mobile phone), which can be used for grounding of components in the electronic device. In one embodiment, the ground / Ground Plate can include any one or more of the following: a ground layer of a circuit board of the electronic device, a ground plate formed by a middle frame of the electronic device, a ground metal layer formed by a metal film under the screen, a conductive ground layer of a battery, and a conductive or metal part electrically connected to the above ground layer / ground plate / metal layer. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14 layer board with 8, 10, 12, 13, or 14 layers of conductive material, or elements separated and electrically insulated by a dielectric or insulating layer such as fiberglass, polymer, etc. In one embodiment, the circuit board includes a dielectric substrate, a ground layer, and a trace layer, and the trace layer and the ground layer are electrically connected by a via. In one embodiment, components such as the display 120, touch screen, input button, transmitter, processor, memory, battery, charging circuit, system on chip (SoC) structure, etc. can be mounted on or connected to the circuit board; or electrically connected to the trace layer and / or the ground layer in the circuit board. For example, the radio frequency source is disposed on the trace layer.

[0163] Any ground layer, or ground plate, or ground metal layer described above is made of a conductive material. In one embodiment, the conductive material can be any one of the following: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-plated copper, graphite powder impregnated cloth, graphite coated substrate, copper plated substrate, brass plated substrate, and aluminum plated substrate. Those skilled in the art can understand that the ground layer / ground plate / ground metal layer can also be made of other conductive materials.

[0164] Grounding: Refers to coupling with the above ground / Ground Plate in any way. In one embodiment, grounding can be physical grounding, such as physical grounding (or called physical ground) at a specific position on the bezel through a part of the structure of the middle frame. In one embodiment, grounding can be component grounding, such as component grounding (or called component ground) through capacitors / inductors / resistors in series or parallel.

[0165] Resonant frequency: Resonant frequency is also called resonance frequency. Resonant frequency can have a frequency range, i.e., a frequency range in which resonance occurs. Resonant frequency can be a frequency range in which return loss characteristic is less than -6 dB. The frequency corresponding to the strongest resonance point is the center frequency point frequency. The return loss characteristic of the center frequency can be less than -20 dB.

[0166] Resonant frequency band: The range of resonant frequencies is the resonant frequency band, and the return loss characteristic of any frequency point in the resonant frequency band can be less than -6 dB or -5 dB.

[0167] Communication frequency band / working frequency band: Regardless of the type of antenna, it always works in a certain frequency range (bandwidth). For example, an antenna supporting B40 frequency band has a working frequency band including frequencies in the range of 2300 MHz to 2400 MHz, or in other words, the working frequency band of the antenna includes the B40 frequency band. The frequency range that meets the index requirements can be regarded as the working frequency band of the antenna. The width of the working frequency band is called the working bandwidth. The working bandwidth of an omnidirectional antenna can reach 3-5% of the center frequency. The working bandwidth of a directional antenna can reach 5-10% of the center frequency. The bandwidth can be considered as a range of frequencies on both sides of the center frequency (for example, the resonant frequency of a dipole), in which the antenna characteristics are within the acceptable value range of the center frequency.

[0168] The resonant frequency band and the working frequency band can be the same or can partially overlap. In one embodiment, one or more resonant frequency bands of an antenna can cover one or more working frequency bands of the antenna.

[0169] Electric length: The electric length can refer to the physical length (i.e., mechanical length or geometric length) multiplied by the ratio of the transmission time of an electric or electromagnetic signal in a medium to the time required for this signal to pass through the same distance in free space as the physical length of the medium, and the electric length can satisfy the following formula:

[0170] Where L is the physical length, a is the transmission time of an electric or electromagnetic signal in a medium, and b is the transmission time in free space.

[0171] Alternatively, the electric length can also refer to the ratio of the physical length (i.e., mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave, and the electric length can satisfy the following formula:

[0172] Where L is the physical length, and λ is the wavelength of the electromagnetic wave.

[0173] In some embodiments of the present application, the physical length of the radiator can be understood as within ±20%, or within ±10%, or within ±5% of the electric length of the radiator.

[0174] In the embodiments of the present application, the wavelength in a certain wavelength mode (such as the half-wavelength mode) of the antenna can refer to the wavelength of the signal radiated by the antenna. For example, the half-wavelength mode of the suspended metal antenna can generate a resonance in the 1.575 GHz frequency band, where the wavelength in the half-wavelength mode refers to the wavelength of the signal radiated by the antenna in the 1.575 GHz frequency band.

[0175] Wavelength: or operating wavelength, can be the wavelength corresponding to the center frequency of the resonance frequency or the center frequency of the operating frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonance frequency of 1920-1980 MHz) is 1955 MHz, the operating wavelength can be the wavelength calculated using the frequency of 1955 MHz. Without being limited to the center frequency, the "operating wavelength" can also refer to the wavelength corresponding to a non-center frequency of the resonance frequency or the operating frequency band.

[0176] It should be understood that the wavelength of the radiated signal in the air can be calculated as follows: (air wavelength, or vacuum wavelength) = speed of light / frequency, where the frequency is the frequency (MHz) of the radiated signal, and the speed of light can be taken as 3x10 8 m / s. The wavelength of the radiated signal in the medium can be calculated as follows: where ε is the relative permittivity of the medium. The wavelength in the embodiments of the present application generally refers to the medium wavelength, which can be the medium wavelength corresponding to the center frequency of the resonance frequency, or the medium wavelength corresponding to the center frequency of the operating frequency band supported by the antenna. For example, assuming that the center frequency of the B1 uplink frequency band (resonance frequency of 1920-1980 MHz) is 1955 MHz, the wavelength can be the medium wavelength calculated using the frequency of 1955 MHz. Without being limited to the center frequency, the "medium wavelength" can also refer to the medium wavelength corresponding to a non-center frequency of the resonance frequency or the operating frequency band. For ease of understanding, the medium wavelength mentioned in the embodiments of the present application can be simply calculated by the relative permittivity of the medium filled on one side or multiple sides of the radiator.

[0177] End / point: the "end / point" in the first end / second end / feed end / ground end / feed point / ground point / connection point of the antenna radiator, which cannot be understood as a point or end physically disconnected from other radiators, but can also be considered as a certain point or section on a continuous radiator. In an embodiment, the "end / point" can include a connection / coupling area on the antenna radiator for coupling other conductive structures, for example, the feed end / feed point can be a coupling area (for example, an area facing a part of the feed circuit) on the antenna radiator for coupling a feed structure or a feed circuit, and for another example, the ground end / ground point can be a connection / coupling area on the antenna radiator for coupling a ground structure or a ground circuit.

[0178] Open end, closed end: In some embodiments, open end and closed end are relative to ground, for example, closed end is grounded, open end is not grounded. In some embodiments, open end and closed end are relative to other conductive body, for example, closed end is electrically connected to other conductive body, open end is not electrically connected to other conductive body. In one embodiment, open end can also be called floating end, free end, open end, or open circuit end. In one embodiment, closed end can also be called grounded end, or short circuit end. It should be understood that, in some embodiments, other conductive body can be coupled to open end to transfer coupling energy (it can be understood as transferring current).

[0179] In some embodiments, the understanding of "closed end" can also be from the perspective of current distribution, closed end or grounded end, etc. can be understood as a large current point on the radiator, or a small electric field point on the radiator; in one embodiment, coupling electronic devices (such as capacitors, inductors, etc.) at the closed end can not change the current distribution characteristics of the large current point / small electric field point; in one embodiment, opening a slot (such as a gap filled with insulating material) at or near the closed end can not change the current distribution characteristics of the large current point / small electric field point.

[0180] In some embodiments, the understanding of "open end" can also be from the perspective of current distribution, open end or floating end, etc. can be understood as a small current point on the radiator, or a large electric field point on the radiator; in one embodiment, coupling electronic devices (such as capacitors, inductors, etc.) at the open end can not change the current distribution characteristics of the small current point / large electric field point.

[0181] It should be understood that, coupling electronic devices (such as capacitors, inductors, etc.) at the radiator end of a gap (from the structure of the radiator, similar to the radiator at the opening of the open end or floating end) can make the radiator end a large current point / small electric field point, in which case, it should be understood that the radiator end of the gap is actually a closed end or a grounded end, etc.

[0182] The intermediate or intermediate position mentioned in the embodiments of the present application and other such position or distance limitations all represent a certain range. For example, the middle (position) of the conductor can be a conductor portion including a midpoint on the conductor, or a conductor portion of one-eighth wavelength including the midpoint of the conductor, where the wavelength can be the wavelength corresponding to the operating frequency band of the antenna, the wavelength corresponding to the center frequency of the operating frequency band, or the wavelength corresponding to the resonance point. For another example, the middle (position) of the conductor can be a conductor portion on the conductor that is less than a predetermined threshold (such as 1mm, 2mm, or 2.5mm) from the midpoint. The middle position of the slot or the middle position of one side of the slot refers to the middle position of one side of the slot.

[0183] The co-linear, co-axial, co-planar, symmetric (e.g., axisymmetric, or centrosymmetric, etc.), parallel, perpendicular, identical (e.g., identical length, identical width, etc.) and the like mentioned in the embodiments of the present application are relative to the current process level, rather than the absolute definition in the mathematical sense. There can be a deviation less than a predetermined threshold (e.g., 1 mm, 0.5 m, or 0.1 mm) in the line width direction between the edges of two radiating branches or two antenna elements that are co-linear. There can be a deviation less than a predetermined threshold in the direction perpendicular to the co-planar plane between the edges of two radiating branches or two antenna elements that are co-planar. There can be a deviation of a predetermined angle between two antenna elements that are parallel or perpendicular to each other. In an embodiment, the predetermined threshold can be less than or equal to 1 mm, for example, the predetermined threshold can be 0.5 mm, or can be 0.1 mm. In an embodiment, the predetermined angle can be an angle within the range of ±10°, for example, the predetermined angle deviation is ±5°.

[0184] The current co-directional / reversal distribution mentioned in the embodiments of the present application should be understood as the direction of the main current on the same side of the conductor is co-directional / reversal. For example, when co-directional distribution current (e.g., the current path is also bent or ring-shaped) is excited on the conductor in a bent shape or a ring shape, it should be understood that, for example, the main current excited on the conductors on both sides of the ring-shaped conductor (e.g., the conductors around a gap, on both sides of the gap) is opposite in direction, but still belongs to the definition of co-directional distribution current in the present application. In an embodiment, the co-directional current on a conductor can mean that the current on the conductor has no reversal point. In an embodiment, the reversal current on a conductor can mean that the current on the conductor has at least one reversal point. In an embodiment, the co-directional current on two conductors can mean that the currents on the two conductors have no reversal point and flow in the same direction. In an embodiment, the reversal current on two conductors can mean that the currents on the two conductors have no reversal point and flow in opposite directions. The co-directional / reversal of the current on multiple conductors can be understood accordingly.

[0185] Antenna gain: used to characterize the degree of concentration of input power radiated by the antenna. Generally, the narrower the main lobe of the antenna pattern, the smaller the side lobe, and the higher the antenna gain.

[0186] System efficiency: refers to the ratio of the power radiated by the antenna into space (i.e., the power of the part effectively converted into electromagnetic waves) to the input power of the antenna. The system efficiency is the actual efficiency after considering the antenna port matching, i.e., the system efficiency of the antenna is the actual efficiency (i.e., the efficiency) of the antenna.

[0187] Radiation efficiency: refers to the ratio of the power radiated by the antenna into space (i.e. the power effectively converted into electromagnetic waves) to the active power input into the antenna. The active power input into the antenna = input power of the antenna - loss power; the loss power mainly includes the return loss power and the ohmic loss power of the metal and / or the dielectric loss power. The metal loss and the dielectric loss are both factors affecting the radiation efficiency.

[0188] As understood by those skilled in the art, efficiency is generally expressed in percentage, which has a corresponding conversion relationship with dB, and the closer the efficiency is to 0dB, the better the efficiency of the antenna is represented.

[0189] dB: is decibel, which is a logarithmic concept with base 10. Decibel is only used to evaluate the ratio between one physical quantity and another physical quantity, and it itself has no physical dimension. The ratio between two quantities increases by 10 times, and their difference can be expressed as 10 decibels. For example: A = "100", B = "10", C = "5", D = "1", then A / D = 20dB; B / D = 10dB; C / D = 7dB; B / C = 3dB. That is, a difference of 10 decibels between two quantities means a difference of 10 times, a difference of 20 decibels means a difference of 100 times, and so on. A difference of 3dB means a difference of 2 times between two quantities.

[0190] dBi: generally mentioned together with dBd. dBi and dBd are units of power gain, both of which are relative values, but the reference bases are different. The reference base of dBi is omnidirectional antenna; the reference base of dBd is dipole. It is generally believed that dBi and dBd represent the same gain, and the value represented by dBi is 2.15dBi larger than that represented by dBd. For example: for an antenna with a gain of 16dBd, its gain converted into dBi is 18.15dBi, generally ignoring the decimal place, it is 18dBi.

[0191] Antenna return loss: can be understood as the ratio of the signal power reflected back to the antenna port through the antenna circuit to the antenna port transmission power. The smaller the reflected signal, the greater the signal radiated by the antenna into space, and the greater the antenna radiation efficiency. The greater the reflected signal, the smaller the signal radiated by the antenna into space, and the smaller the antenna radiation efficiency.

[0192] Antenna return loss can be represented by S11 parameter, which belongs to S parameters. S11 represents the reflection coefficient, which can represent the advantages and disadvantages of antenna transmission efficiency.

[0193] In one embodiment, the S11 diagram can be understood as a schematic diagram for representing the resonance generated by the antenna. In one embodiment, the resonance shown in the S11 diagram in the part less than -6dB can be understood as the resonance frequency / frequency range / operating frequency band generated by the antenna. The S11 parameter is generally negative, the smaller the S11 parameter, the smaller the antenna return loss, the smaller the energy reflected back by the antenna itself, that is, the more energy actually entering the antenna, the higher the system efficiency of the antenna; the larger the S11 parameter, the larger the antenna return loss, the lower the system efficiency of the antenna.

[0194] It should be noted that in engineering, -6dB is generally taken as a standard for the S11 value, and when the S11 value of the antenna is less than -6dB, it can be considered that the antenna can work normally, or it can be considered that the transmission efficiency of the antenna is better.

[0195] The electronic device provided in the embodiments of the present application can include a mobile phone, a tablet computer, a notebook computer, a remote information processor, and the like. The electronic device includes an antenna assembly (antenna), and wireless communication between the electronic device and a communication base station, other electronic devices, a satellite, and the like can be achieved through the antenna assembly.

[0196] Please refer to FIG. 1. In an implementation in which the electronic device 10 includes a mobile phone, the mobile phone includes a middle frame 110, a display panel 120, and a mainboard 130. The middle frame 110 includes a middle plate 111 and a bezel 112 surrounding the outer periphery of the middle plate 111. The bezel 112 is surrounded to form a mounting cavity, and the mainboard 130 is arranged in the mounting cavity. The display panel 120 is covered on the bezel 112 to enclose the mounting cavity. The display panel 120 is electrically connected to the mainboard 130 to control the display panel 120 to display images through the mainboard 130. The antenna assembly can be arranged on the bezel 112. For example, the antenna assembly can be an integral structure with the bezel 112, that is, part of the bezel 112 serves as the antenna assembly. Of course, the antenna assembly can also be installed on the bezel 112 through a patch, a bolt connection, or the like. The embodiments of the present application do not limit this.

[0197] In the embodiments of the present application, the electronic device 10 further includes a radio frequency device. The radio frequency device is coupled to the antenna assembly. The radio frequency device can feed radio frequency signals to the antenna assembly, so that the antenna assembly can transmit signals to the outside world or receive signals from the outside world. For example, the radio frequency device can include a radio frequency chip or the like capable of emitting radio frequency signals. In the implementation in which the electronic device 10 includes a mobile phone, the radio frequency device can be arranged on the mainboard 130.

[0198] In the related art, referring to FIG. 2, the antenna assembly includes an antenna branch 201 and a ground plate 202, the antenna branch 201 and the ground plate 202 are arranged in a spaced manner, the antenna branch 201 is coupled between the ground plate 202 and a ground branch 203; the antenna branch 201 has a feed point a for receiving a radio frequency signal, the feed point a is located on one side of the ground branch 203. The antenna assembly further includes a capacitive structure 204, one end of the capacitive structure 204 is coupled to the antenna branch 201 on the other side of the ground branch 203, and the other end of the capacitive structure 204 is configured to be grounded.

[0199] Referring to FIG. 3, FIG. 3 is a return loss curve diagram of the antenna assembly shown in FIG. 2, when the antenna assembly is in operation, a first resonance and a second resonance are generated, a resonance frequency band of the first resonance and a resonance frequency band of the second resonance can jointly cover a same communication frequency band. FIG. 4 and FIG. 5 are current schematic diagrams of the antenna assembly shown in FIG. 2 in the first resonance and the second resonance, respectively. Referring to FIG. 4 and FIG. 5, in the first resonance, the antenna branch 201 has a current reversal point, the current directions on the antenna branch 201 on both sides of the current reversal point are opposite (reversal current), that is, the mode of the antenna assembly is a common mode (CM mode for short); in the second resonance, the current directions on the antenna branch 201 are the same (same direction current), that is, the mode of the antenna assembly is a differential mode (DM mode for short). FIG. 6 is an antenna efficiency diagram of the antenna assembly shown in FIG. 2. Referring to FIG. 6, due to the current reversal point on the antenna branch 201 in the first resonance, the antenna efficiency curve of the antenna assembly has an obvious pit (obvious grooves exist in the radiation efficiency and the system efficiency), which further causes poor antenna efficiency of the antenna assembly and affects the communication performance of the antenna assembly.

[0200] To this end, the embodiment of the present application provides an antenna assembly, which can eliminate or reduce the pit of the antenna efficiency curve in the antenna assembly, and further improve the communication performance of the antenna assembly.

[0201] Referring to FIG. 7, the antenna assembly provided by the embodiment of the present application includes a ground plate 202 and a suspended branch 205 arranged in a spaced manner with the ground plate 202. In an implementation manner in which the electronic device 10 (as shown in FIG. 1) includes a mobile phone, the ground plate 202 can include a ground structure such as a middle plate 111, a ground layer on a main plate 130, and the like. The embodiment of the present application does not limit the ground plate 202.

[0202] In the implementation manners above, the floating branch 205 can include oppositely arranged first and second open ends 2051 and 2052, which can be two ends of the floating branch 205 along the extension direction (length direction), and the floating branch 205 is further provided with a feeding point a between the first and second open ends 2051 and 2052, which is configured to receive a radio frequency signal. For example, the floating branch 205 can be arranged on the frame 112 (as shown in FIG. 1), and in some implementation manners, the floating branch 205 can be in an integrated structure with the frame 112, that is, part of the frame 112 serves as the floating branch 205, so as to simplify the structure of the electronic device 10; in other implementation manners, the floating branch 205 can be connected to the frame 112 or the middle plate by means of bolting or clamping, so as to fix the floating branch 205.

[0203] In the embodiments of the present application, the antenna assembly further includes a matching circuit 206 coupled to the feeding point a to feed a signal to the feeding point a, so that the antenna assembly can generate a first resonance and a second resonance, both of which can be a quarter mode (the length of the floating branch 205 is one quarter of the corresponding resonance frequency), and the resonance frequency of the first resonance can be less than that of the second resonance. The matching circuit 206 includes a first matching capacitor 2061, one end of which is coupled to the feeding point a, and the other end is configured to be grounded.

[0204] The floating branch 205 in the embodiments of the present application is suspended above the floor 202, that is, the floating branch 205 is arranged in a spaced manner from the floor 202, and no solid structure (metal sheet, wire, etc.) is connected between the floating branch 205 and the floor 202. The flow path of the current on the floating branch 205 to the floor 202 needs to pass through the first matching capacitor 2061, that is, there is no current on the floating branch 205 that does not flow to the floor 202 through the first matching capacitor 2061. Through the above arrangement, the floating branch 205 is weakly grounded through the first matching capacitor 2061, and the coupling amount of the floating branch 205 on both sides of the feeding point a under the first and second resonances is small (weak coupling), so that the current on the floating branch 205 under the first and second resonances is all in the same direction. Compared with the related art shown in FIG. 2, the current reversal point is eliminated, thereby reducing or eliminating the pits in the antenna efficiency curve, and improving the communication performance of the antenna assembly.

[0205] With reference back to FIG. 7, at the first resonance, the antenna assembly is a linear antenna, and the signal is mainly radiated outward by the suspended branch 205 between the feeding point a and the second open end 2052, i.e., the antenna assembly is a DM mode of the right-side branch radiation at the first resonance; similarly, at the second resonance, the antenna assembly is a linear antenna, and the signal is mainly radiated outward by the suspended branch 205 between the feeding point a and the first open end 2051, i.e., the antenna assembly is a DM mode of the left-side branch radiation at the second resonance.

[0206] Correspondingly, at the first resonance, the suspended branch 205 between the feeding point a and the second open end 2052 couples the signal to the suspended branch 205 between the feeding point a and the first open end 2051, and since the feeding point a is weakly grounded through the first matching capacitor 2061, the coupling amount between the suspended branches 205 on both sides of the feeding point a can be reduced (weak coupling), so as to ensure that the currents on the suspended branches 205 are all in the same direction at the first resonance. Similarly, at the second resonance, the suspended branch 205 between the feeding point a and the first open end 2051 couples the signal to the suspended branch 205 between the feeding point a and the second open end 2052, and since the feeding point a is weakly grounded through the first matching capacitor 2061, the coupling amount between the suspended branches 205 on both sides of the feeding point a can be reduced (weak coupling), so as to ensure that the currents on the suspended branches 205 are all in the same direction at the second resonance.

[0207] It can be understood that the matching circuit 206 in the embodiment of the present application is not limited to including the first matching capacitor 2061, and the matching circuit 206 can also include other capacitors and / or inductors, and the embodiment of the present application does not limit the matching circuit 206.

[0208] In the above embodiment, the suspended branch 205 has a midpoint p along the extension direction thereof, and the feeding point a can be arranged between the first open end 2051 and the midpoint p, or the feeding point a is arranged between the second open end 2052 and the midpoint p, and the embodiment of the present application does not limit this. It can be understood that, as the distance between the feeding point a and the midpoint p gradually decreases, the frequency ratio between the first resonance and the second resonance increases, i.e., the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance increases; on the contrary, as the distance between the feeding point a and the midpoint p gradually increases, the frequency ratio between the first resonance and the second resonance decreases, i.e., the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance decreases.

[0209] In some embodiments, the distance between the feeding point a and the midpoint p of the floating branch 205 along the extending direction of the floating branch 205 is less than or equal to one fourth of the length of the floating branch 205 along the extending direction of the floating branch 205, so that the frequency comparison between the resonant frequency of the first resonance and the resonant frequency of the second resonance is small, the frequency difference between the first resonance and the second resonance is small (for example, the frequency difference can be less than or equal to 300 MHz, such as 100 MHz, 200 MHz, etc.), and the resonant frequency band of the first resonance and the resonant frequency band of the second resonance jointly cover the same communication frequency band. In this way, the bandwidth of the antenna assembly can be increased, and the communication performance of the antenna assembly can be improved.

[0210] For example, the distance between the feeding point a and the midpoint p can be 2 mm-6 mm (such as 2 mm, 4 mm, 6 mm, etc.), so as to avoid that the distance between the feeding point a and the midpoint p is too large or too small while ensuring that the first resonance and the second resonance jointly cover the same communication frequency band. It can be understood that as the distance between the feeding point a and the midpoint p gradually increases, the frequency difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance gradually increases, and reasonable selection of the distance between the feeding point a and the midpoint p can ensure that the frequency difference between the resonant frequency of the first resonance and the resonant frequency of the second resonance is moderate.

[0211] In some implementations, the matching circuit 206 further includes a first matching inductor 2062, one end of the first matching inductor 2062 is coupled with one end of the first matching capacitor 2061, the other end of the first matching inductor 2062 is also used for receiving the radio frequency signal, and the other end of the first matching inductor 2062 is coupled with the feeding point a; that is, one end of the first matching capacitor 2061 is coupled with the feeding point a through the first matching inductor 2062, and the other end of the first matching capacitor 2061 is grounded; the signal from the radio frequency chip is fed into the feeding point a through the first matching inductor 2062. In this way, the antenna matching of the antenna assembly can be performed through the first matching inductor 2062, and the performance of the antenna assembly can be improved.

[0212] Please refer to FIG. 8, the distance between the feeding point a and the midpoint p is 4 mm, and correspondingly, the matching circuit 206 can further include a second matching capacitor 2063, one end of the first matching inductor 2062 is coupled with the feeding point a, the other end of the first matching inductor 2062 is coupled with one end of the first matching capacitor 2061 and the second matching capacitor 2063, the other end of the first matching capacitor 2061 is grounded, and the other end of the second matching capacitor 2063 is used for receiving the radio frequency signal.

[0213] FIG. 9 and FIG. 10 are respectively a return loss curve and an antenna efficiency curve of the antenna assembly shown in FIG. 8 when the inductance value of the first matching inductor 2062 is 2nH, the capacitance value of the first matching capacitor 2061 is 0.5pF, and the capacitance value of the second matching capacitor 2063 is 1pF. As shown in FIG. 9, the antenna assembly can generate a first resonance and a second resonance, the resonance frequency of the first resonance is about 2.45GHz, the resonance frequency of the second resonance is about 2.9GHz, and the resonance frequency band of the first resonance and the resonance frequency band of the second resonance collectively cover the same communication frequency band. As shown in FIG. 10, under the first resonance and the second resonance, the radiation efficiency curve and the system efficiency curve of the antenna assembly do not have obvious notches, and the antenna efficiency of the antenna assembly does not have obvious pits, thereby improving the communication performance of the antenna assembly.

[0214] FIG. 11 is a current schematic diagram of the antenna assembly shown in FIG. 8 under the first resonance. As shown in FIG. 11, under the first resonance, the current on the floating branch 205 is a unidirectional current, and the signal is mainly radiated outward by the floating branch 205 between the feeding point a and the second open end 2052, i.e., the antenna assembly under the first resonance is a DM mode of the right-side branch radiation. FIG. 12 is a current schematic diagram of the antenna assembly shown in FIG. 8 under the second resonance. As shown in FIG. 12, under the second resonance, the current on the floating branch 205 is a unidirectional current, and the signal is mainly radiated outward by the floating branch 205 between the feeding point a and the first open end 2051, i.e., the antenna assembly under the second resonance is a DM mode of the left-side branch radiation.

[0215] In other embodiments, the distance between the feeding point a and the first open end 2051 is less than or equal to one fourth of the length of the floating branch 205 along its extension direction, i.e., the feeding point a is arranged close to the first open end 2051, so that the resonance frequency of the first resonance and the resonance frequency of the second resonance have a large frequency comparison, the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is large (for example, the frequency difference can be greater than 300MHz, such as 400MHz, 500MHz, etc.), and the resonance frequency band of the first resonance and the resonance frequency band of the second resonance cover different communication frequency bands, respectively, so that the antenna assembly can cover different communication frequency bands and increase the bandwidth of the antenna assembly. For example, the resonance frequency band of the first resonance covers a first communication frequency band, and the first communication frequency band can be a B1 frequency band (1920MHz to 1980MHz) or a B3 frequency band (1710MHz to 1785MHz); the resonance frequency band of the second resonance covers a second communication frequency band, and the second communication frequency band can be a B40 frequency band (2300MHz to 2400MHz) or a B41 frequency band (2496MHz to 2690MHz).

[0216] Please refer to FIG. 13, in some implementations, the feeding point a is arranged between the first open end 2051 and the midpoint p, and the matching circuit 206 can include a first matching capacitor 2061 and a first matching inductor 2062, one end of the first matching capacitor 2061 is coupled with the feeding point a, the other end of the first matching capacitor 2061 is coupled with the first matching inductor 2062, the other end of the first matching inductor 2062 is configured to be grounded, and the other end of the first matching capacitor 2061 is also configured to receive the radio frequency signal. In this way, the floating branch 205 is weakly grounded through the first matching capacitor 2061 and the first matching inductor 2062, so as to ensure that the currents on the floating branch 205 in the first resonance and the second resonance are both unidirectional currents, thereby avoiding the occurrence of a notch in the antenna efficiency curve of the antenna assembly and improving the communication performance of the antenna assembly. In addition, the first matching inductor 2062 can be arranged to achieve impedance matching of the antenna assembly.

[0217] Please refer to FIG. 14, which is a schematic diagram of the current of the antenna assembly shown in FIG. 13 in the first resonance. In the first resonance, the current on the floating branch 205 is unidirectional, and the signal is mainly radiated outward by the floating branch 205 between the feeding point a and the second open end 2052, i.e., the antenna assembly in the first resonance is in the DM mode of the right-side branch radiation. FIG. 15 is a schematic diagram of the current of the antenna assembly shown in FIG. 13 in the second resonance. As shown in FIG. 15, in the second resonance, the current on the floating branch 205 is unidirectional, and the signal is mainly radiated outward by the floating branch 205 between the feeding point a and the first open end 2051, i.e., the antenna assembly in the second resonance is in the DM mode of the left-side branch radiation.

[0218] Please refer to FIG. 16 and FIG. 17, in some embodiments, the antenna assembly further includes a first grounding capacitor 207, and the floating branch 205 is provided with a first connection point b, one end of the first grounding capacitor 207 is coupled with the first connection point b, and the other end of the first grounding capacitor 207 is configured to be grounded. The shortest distance between the first connection point b and the midpoint p of the floating branch 205 along the extension direction of the floating branch 205 is less than or equal to one-eighth of the length of the floating branch 205 along the extension direction, and the shortest distance between the first connection point b and the feeding point a is greater than or equal to 2 mm, so that the first connection point b is arranged at the electric field reversal point on the floating branch 205 in the first resonance and the second resonance, and the currents on the floating branch 205 in the first resonance and the second resonance will not flow to the ground plane 202 through the first grounding capacitor 207, thereby ensuring that the directions of the currents on the floating branch 205 in the first resonance and the second resonance are the same, and avoiding the occurrence of a travel current reversal point.

[0219] By setting the first grounding capacitor 207, the antenna assembly can generate a third resonance, the resonance frequency of the third resonance is greater than the first resonance frequency and the second resonance frequency, and the communication frequency band covered by the third resonance frequency band can be different from the communication frequency bands covered by the first resonance and the second resonance, so as to further increase the bandwidth of the antenna assembly.

[0220] In the above implementation manner, the capacitance value of the first grounding capacitor 207 can be less than or equal to 2 pF (such as 2 pF, 1 pF, etc.), so as to ensure that the capacitance value of the first grounding capacitor 207 is moderate. It can be understood that by adjusting the capacitance value of the first grounding capacitor, the resonance frequency of the third resonance can be adjusted, and as the capacitance value of the first grounding capacitor gradually increases, the resonance frequency of the third resonance gradually decreases.

[0221] Continuing to refer to FIGS. 16 and 17, under the first resonance, the current on the floating branch 205 is a same-direction current, and the signal is mainly radiated outward by the floating branch 205 between the feed point a and the second open end 2052, that is, under the first resonance, the antenna assembly is a DM mode of a right-side branch radiation. Under the second resonance, the current on the floating branch 205 is a same-direction current, and the signal is mainly radiated outward by the floating branch 205 between the feed point a and the first open end 2051, that is, under the second resonance, the antenna assembly is a DM mode of a left-side branch radiation. Under the third resonance, the current directions on the floating branches 205 on both sides of the first connection point b are opposite, and the signal is mainly radiated outward by the entire floating branch 205, that is, under the third resonance, the antenna assembly is a CM mode of a whole-branch radiation.

[0222] Please refer to FIG. 18, in some embodiments, the antenna assembly further includes a first tuning device 208, one end of the first tuning device 208 is coupled with the second connection point on the floating branch 205, and the other end of the first tuning device 208 is configured to be grounded; the second connection point is arranged between the midpoint p and the first open end 2051, since the signal is mainly radiated outward by the floating branch 205 between the feed point a and the first open end 2051 under the second resonance, the first tuning device 208 can adjust the resonance frequency of the second resonance. In this way, by the first tuning device 208, the resonance frequency of the second resonance can be adjusted, and the communication frequency band covered by the second resonance frequency band is adjusted, so that the antenna assembly can adapt to different communication frequency bands.

[0223] It can be understood that the embodiments of the present application do not limit the first tuning device 208, and the first tuning device 208 can include a capacitor and / or an inductor. In the implementation manner in which the first tuning device 208 includes a capacitor and an inductor, the capacitor and the inductor can be connected in series or in parallel.

[0224] In the above implementation, the distance between the second connection point and the first open end 2051 is 1 / 16-3 / 16 (such as 1 / 16, 1 / 8, 3 / 16, etc.) of the length of the floating branch 205 along its extension direction, so that the electric field at the second connection point under the first resonance and the second resonance is larger, so as to avoid the current on the floating branch 205 flowing to the floor 202 through the first tuning device 208, thereby avoiding the formation of a current reversal point on the floating branch 205.

[0225] In some implementations, the antenna assembly can further include a first switch device, and the first tuning device 208 is coupled to the second connection point through the first switch device. In this way, whether the first tuning device 208 is coupled to the second connection point can be controlled through the first switch device, thereby realizing control over the second resonance frequency.

[0226] Continuing to refer to FIG. 18, in some embodiments, the antenna assembly further includes a second tuning device 209, one end of the second tuning device 209 is coupled to a third connection point on the floating branch 205, and the other end of the second tuning device 209 is configured to be grounded; the third connection point is arranged between the midpoint and the second open end 2052. Since the signal under the first resonance is mainly radiated outward by the floating branch 205 between the feed point a and the second open end 2052, the second tuning device 209 can adjust the resonance frequency of the first resonance.

[0227] In this way, the resonance frequency of the first resonance can be adjusted through the second tuning device 209, thereby adjusting the communication frequency band covered by the first resonance frequency band, so that the antenna assembly can adapt to different communication frequency bands.

[0228] It can be understood that the embodiments of the present application do not limit the second tuning device 209, and the second tuning device 209 can include a capacitor and / or an inductor. In the implementation in which the second tuning device 209 includes a capacitor and an inductor, the capacitor and the inductor can be connected in series or in parallel.

[0229] In the above implementation, the distance between the third connection point and the second open end 2052 is 1 / 16-3 / 16 (such as 1 / 16, 1 / 8, 3 / 16, etc.) of the length of the floating branch 205 along its extension direction, so that the electric field at the third connection point under the first resonance and the second resonance is larger, so as to avoid the current on the floating branch 205 flowing to the floor 202 through the second tuning device 209, thereby avoiding the formation of a current reversal point on the floating branch 205.

[0230] In some implementations, the antenna assembly can further include a second switch device, and the second tuning device 209 is coupled to the third connection point through the second switch device. In this way, whether the second tuning device 209 is coupled to the third connection can be controlled through the second switch device, thereby realizing control over the first resonance frequency.

[0231] In some implementations, the antenna assembly can include a first tuning device 208 coupled to the second connection point through a first switch device and a second tuning device 209 coupled to the third connection point through a second switch device. The resonance frequency of the first resonance and the second resonance can be adjusted individually through the first switch device and the second switch device.

[0232] Please refer to FIG. 19 and FIG. 20, the curves in FIG. 20 are respectively the return loss curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 and the second tuning device 209 both disconnected; the return loss curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 disconnected and the second tuning device 209 being 0.3 pF; the return loss curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 disconnected and the second tuning device 209 being 0.6 pF. As shown in FIG. 19 and FIG. 20, the resonance frequency of the first resonance can be adjusted through the second tuning device 209, and the resonance frequency of the first resonance gradually increases as the capacitance value of the second tuning device 209 increases.

[0233] Please refer to FIG. 19 and FIG. 21, the curves in FIG. 21 are respectively the system efficiency curves and the radiation efficiency curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 and the second tuning device 209 both disconnected; the system efficiency curves and the radiation efficiency curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 disconnected and the second tuning device 209 being 0.6 pF. As shown in FIG. 21, the second tuning device 209 does not cause obvious dips in the antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0234] Please refer to FIG. 22, the curves in FIG. 22 are respectively the return loss curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 disconnected and the second tuning device 209 being 0.3 pF; the return loss curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 being 0.3 pF and the second tuning device 209 being 0.6 pF. As shown in FIG. 22, the resonance frequency of the second resonance can be adjusted through the first tuning device 208. The curves in FIG. 23 are respectively the system efficiency curves and the radiation efficiency curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 disconnected and the second tuning device 209 being 0.3 pF; the system efficiency curves and the radiation efficiency curves of the antenna assembly shown in FIG. 19 with the first tuning device 208 being 0.3 pF and the second tuning device 209 being 0.6 pF. As shown in FIG. 23, the first tuning device 208 does not cause obvious dips in the antenna efficiency, ensuring that the antenna assembly has good communication performance.

[0235] Please refer to FIG. 24, in the implementation mode in which the antenna assembly comprises the first tuning device 208 and the second tuning device 209, the antenna assembly can also comprise a first grounding capacitor 207, one end of the first grounding capacitor 207 is coupled with the first connection point b, and the other end of the first grounding capacitor 207 is configured to be grounded. Through the setting, the first grounding capacitor 207 can make the antenna assembly generate a third resonance, the resonance frequency of the third resonance is greater than the first resonance frequency and the second resonance frequency, and the communication frequency band covered by the resonance frequency of the third resonance can be different from the communication frequency bands covered by the first resonance and the second resonance, so as to further increase the bandwidth of the antenna assembly.

[0236] Please refer to FIG. 25, in some embodiments, the antenna assembly further comprises a first grounding branch 210 and the first tuning device 208, one end of the first grounding branch 210 has a first gap 211 between the first open end 2051, and the other end of the first grounding branch 210 is a grounded end; for example, the first grounding branch 210 is arranged in parallel with the suspended branch 205, and one end of the first grounding branch 210 faces the first open end 2051. One end of the first tuning device 208 is coupled with the first open end 2051, and the other end of the first tuning device 208 is coupled with one end of the first grounding branch 210, and the first tuning device 208 can comprise a capacitor and / or an inductor, and the embodiments of the present application do not limit the first tuning device 208. In some implementation modes, the first tuning device 208 can also be coupled with the first grounding branch 210 through a first switching device, so as to control whether the first tuning device 208 is coupled with the first grounding branch 210 through the first switching device.

[0237] For example, the length of the first grounding branch 210 along its extension direction is less than or equal to one fourth of the wavelength corresponding to the communication frequency, such as one sixth, one eighth, etc. of the wavelength corresponding to the communication frequency.

[0238] Through the above setting, under the first resonance and the second resonance, the antenna structure comprising the ground plate 202, the first grounding branch 210, the first gap 211 and the suspended branch 205 is a slot antenna, the current direction on the first grounding branch 210 is the same as the current direction on the suspended branch 205, so that the mode of the slot antenna is the CM mode, and under the second resonance, the signal of the antenna assembly is mainly radiated outward by the suspended branch 205 between the feeding point a and the first open end 2051, so that the antenna efficiency and the bandwidth (efficiency bandwidth) of the antenna assembly under the second resonance can be increased, and the resonance frequency of the second resonance can also be adjusted.

[0239] Please refer to FIG. 26, in some embodiments, the antenna assembly further comprises a second ground branch 212 and a second tuning device 209, the second ground branch 212 has a second gap 213 between one end of the second ground branch 212 and the second open end 2052, and the other end of the second ground branch 212 is a ground end; for example, the second ground branch 212 is arranged in parallel with the floating branch 205, and one end of the second ground branch 212 faces the second open end 2052. One end of the second tuning device 209 is coupled with the second open end 2052, and the other end of the second tuning device 209 is coupled with one end of the second ground branch 212, and the second tuning device 209 can include capacitance and / or inductance, and the embodiments of the present application do not limit the second tuning device 209. In some implementations, the second tuning device 209 can also be coupled with the second ground branch 212 through a second switching device, so as to control whether the second tuning device 209 is connected with the second ground branch 212 through the second switching device.

[0240] For example, the length of the second ground branch 212 along the extension direction thereof is less than or equal to one fourth of the wavelength corresponding to the communication frequency, such as one sixth, one eighth, etc. of the wavelength corresponding to the communication frequency.

[0241] Through the above arrangement, under the first resonance and the second resonance, the antenna structure including the ground plate 202, the second ground branch 212, the second gap 213 and the floating branch 205 is a slot antenna, the current direction on the second ground branch 212 is the same as the current direction on the floating branch 205, so that the mode of the slot antenna is the CM mode; and under the first resonance, the signal of the antenna assembly is mainly radiated outward by the floating branch 205 between the feeding point a and the second open end 2052, so that the efficiency bandwidth of the antenna assembly under the first resonance can be increased, and the resonance frequency of the first resonance can also be adjusted.

[0242] Please refer to FIG. 27 and FIG. 28, in some embodiments, the antenna assembly comprises a first ground branch 210 and a second ground branch 212, the first ground branch 210 has a first gap 211 between one end of the first ground branch 210 and the first open end 2051, the second ground branch 212 has a second gap 213 between one end of the second ground branch 212 and the second open end 2052, one end of the first tuning device 208 is coupled with the first open end 2051, the other end of the first tuning device 208 is coupled with one end of the first ground branch 210, one end of the second tuning device 209 is coupled with the second open end 2052, and the other end of the second tuning device 209 is coupled with one end of the second ground branch 212.

[0243] In this way, the efficiency bandwidths of the first resonance and the second resonance can be increased simultaneously. In the implementation where the first tuning device 208 is coupled to the first ground branch 210 through the first switch device, and the second tuning device 209 is coupled to the second ground branch 212 through the second switch device, the communication frequency bands covered by the antenna assembly can be adjusted through the first switch device and the second switch device.

[0244] Referring to FIG. 29, the curves in FIG. 29 are respectively the return loss curves of the antenna assembly without the first ground branch 210 and the second ground branch 212 (as shown in FIG. 8), the antenna assembly with the first ground branch 210 (as shown in FIG. 25), the antenna assembly with the second ground branch 212 (as shown in FIG. 26), and the antenna assembly with the first ground branch 210 and the second ground branch 212 (as shown in FIG. 27). As shown in FIG. 28, the resonant frequency of the second resonance can be adjusted through the first ground branch 210 and the first tuning device 208, and the resonant frequency of the first resonance can be adjusted through the second ground branch 212 and the second tuning device 209.

[0245] Referring to FIG. 30, the curves in FIG. 30 are respectively the system efficiency curves of the antenna assembly without the first ground branch 210 and the second ground branch 212 (as shown in FIG. 8), the antenna assembly with the first ground branch 210 (as shown in FIG. 25), the antenna assembly with the second ground branch 212 (as shown in FIG. 26), and the antenna assembly with the first ground branch 210 and the second ground branch 212 (as shown in FIG. 27). As shown in FIG. 29, the system efficiency of the second resonance can be improved through the first ground branch 210 and the first tuning device 208, and the system efficiency of the first resonance can be improved through the second ground branch 212 and the second tuning device 209.

[0246] Referring to FIG. 28 and FIG. 31, in the implementation where the antenna assembly includes the first ground branch 210 and the second ground branch 212, the floating branch 205 is arranged between the first ground branch 210 and the second ground branch 212, and the length of the floating branch 205 is not limited in the embodiments of the present application. It can be understood that appropriately reducing the length of the floating branch 205 can reduce the size of the antenna assembly along the extension direction of the floating branch 205, thereby realizing the miniaturization of the antenna assembly. In some implementations, the first ground branch 210 and the second ground branch 212 can be respectively grounded through corresponding tuning devices. The tuning device coupled to the first ground branch 210 can tune the second resonance, and the tuning device coupled to the second ground branch 212 can tune the first resonance.

[0247] Please refer to FIG. 32a, in the implementation mode in which the antenna assembly includes the first ground branch 210 and the second ground branch 212, the first ground branch 210 and the second ground branch 212 are arranged in parallel, for example, the first ground branch 210 and the second ground branch 212 can be located on the same line. The floating branch 205 is parallel to the first ground branch 210 and the second ground branch 212, and the floating branch 205 is arranged to be spaced from the first ground branch 210 and the second ground branch 212, and the third gap 214 is between the first ground branch 210 and the second ground branch 212. That is, the floating branch 205 can be arranged between (inside) the first ground branch 210 and the second ground branch 212 and the floor 202, or the floating branch 205 is arranged on the side (outside) of the first ground branch 210 and the second ground branch 212 away from the floor 202, and the embodiments of the present application do not limit this. In the vertical direction in the orientation shown in FIG. 32a, the floating branch 205 covers the third gap 214. In this way, the floating branch 205 can be arranged on the inside or outside of the first ground branch 210 and the second ground branch 212, which can reduce the size of the antenna assembly in the direction in which the floating branch 205 extends, and achieve miniaturization of the antenna assembly.

[0248] In the above implementation mode, the antenna assembly is a slot antenna, and accordingly, the magnetic current directions on the first ground branch 210 and the second ground branch 212 are the same at the first resonance and the second resonance, and the mode of the antenna assembly is the CM mode, so as to avoid the efficiency dip.

[0249] In some implementation modes, please refer to FIG. 32b, the antenna assembly further includes a second matching inductor 2066, one end of the second matching inductor 2066 is coupled to one end of the first ground branch 210, and the other end of the second matching inductor 2066 is coupled to one end of the second ground branch 212. The antenna matching of the antenna assembly can be achieved through the second matching inductor 2066, in addition, the second matching inductor 2066 can also adjust the coupling amount between the first ground branch 210 and the second ground branch 212, achieve weak coupling, and further eliminate or reduce the efficiency dip. When the width of the third gap 214 is small, the third gap 214 and the branches on both sides are equivalent to a capacitance, at this time, the second matching inductor 2066 is arranged, which can reduce the coupling amount between the first ground branch 210 and the second ground branch 212, and achieve weak coupling; when the width of the third gap 214 is large, the third gap 214 and the branches on both sides are equivalent to an inductor, at this time, the coupling amount between the first ground branch 210 and the second ground branch 212 is small, and the second matching inductor 2066 can not be arranged.

[0250] It can be understood that, in some implementations, the antenna assembly further includes a first switch device and a second switch device, the first tuning device 208 is coupled with the first ground branch 210 through the first switch device, so as to control whether the first tuning device 208 is coupled with the first ground branch 210 through the first switch device. The second tuning device 209 is coupled through the second switch device, so as to control whether the second tuning device 209 is coupled with the second ground branch 212 through the second switch device. Since the first tuning device 208 can adjust the resonant frequency of the second resonance, and the second tuning device 209 can adjust the resonant frequency of the first resonance, the communication frequency band of the antenna assembly can be adjusted through the first switch device and the second switch device.

[0251] Please refer to FIG. 33, in some implementations, the first ground branch 210 includes a first branch 2101, a second branch 2102 and a third branch 2103, wherein the first branch 2101 is parallel to the floating branch 205, and the first branch 2101 has a first gap 211 between one end of the first branch 2101 and the first open end 2051; one end of the second branch 2102 is coupled with the other end of the first branch 2101, and the other end of the second branch 2102 is a ground end. For example, the second branch 2102 can be arranged vertically with the first branch 2101, and the second branch 2102 is arranged between the first branch 2101 and the ground plate 202, one end of the second branch 2102 is coupled with the first branch 2101, and the other end of the second branch 2102 is coupled with the ground plate 202; the third branch 2103 is parallel to the floating branch 205, the first branch 2101 is located between the third branch 2103 and the floating branch 205, one end of the third branch 2103 is coupled with the other end of the second branch 2102, and the other end of the third branch 2103 is an open end. For example, the third branch 2103 can be arranged on the same line with the first branch 2101. The third branch 2103 can improve the efficiency bandwidth of the second resonance, thereby improving the performance of the antenna assembly.

[0252] In the above implementations, the antenna assembly further includes a third tuning device 215, one end of the third tuning device 215 is coupled with the third branch 2103, and the other end of the third tuning device 215 is configured to be grounded. The third tuning device can tune the second resonance.

[0253] It can be understood that the third tuning device 215 can include capacitance and / or inductance, and in the implementation where the third tuning device 215 includes capacitance and inductance, the capacitance and the inductance can be connected in series or in parallel, and the embodiments of the present application do not limit this. In some implementations, the antenna assembly can further include a third switching device, and the third tuning device 215 is coupled to the third branch 2103 through the third switching device. Whether the third tuning device 215 is coupled to the third branch 2103 can be controlled through the third switching device, so as to facilitate control.

[0254] Please refer to FIG. 34 and FIG. 35a, and similarly, in some implementations, the second ground branch 212 includes a fourth branch 2121, a fifth branch 2122, and a sixth branch 2123. The fourth branch 2121 is parallel to the floating branch 205, and the fourth branch 2121 has a second gap 213 between one end of the fourth branch 2121 and the second open end 2052. One end of the fifth branch 2122 is coupled to the other end of the fourth branch 2121, and the other end of the fifth branch 2122 is a ground end. For example, the fifth branch 2122 can be arranged vertically to the fourth branch 2121. The fifth branch 2122 is arranged between the fourth branch 2121 and the ground plate 202. One end of the fifth branch 2122 is coupled to the fourth branch 2121, and the other end of the fifth branch 2122 is coupled to the ground plate 202. The sixth branch 2123 is parallel to the floating branch 205. The fourth branch 2121 is between the sixth branch 2123 and the floating branch 205. One end of the sixth branch 2123 is coupled to the other end of the fifth branch 2122, and the other end of the sixth branch 2123 is an open end. For example, the sixth branch 2123 can be arranged on the same line as the fourth branch 2121. The sixth branch 2123 can improve the efficiency bandwidth of the first resonance, thereby improving the performance of the antenna assembly.

[0255] In the above implementation, the antenna assembly further includes a fourth tuning device 216. One end of the fourth tuning device 216 is coupled to the sixth branch 2123, and the other end of the fourth tuning device 216 is configured to be grounded. The first resonance can be tuned through the fourth tuning device 216. It can be understood that the fourth tuning device 216 can include capacitance and / or inductance, and in the implementation where the fourth tuning device 216 includes capacitance and inductance, the capacitance and the inductance can be connected in series or in parallel, and the embodiments of the present application do not limit this.

[0256] In some implementations, the antenna assembly can further include a fourth switching device, and the fourth tuning device 216 is coupled to the sixth branch 2123 through the fourth switching device. Whether the fourth tuning device 216 is coupled to the sixth branch 2123 can be controlled through the fourth switching device, so as to facilitate control.

[0257] Referring to FIG. 35b, in some embodiments, the antenna assembly further includes a first tuning device 230, one end of the first tuning device 230 is coupled with the first branch 2101, and the other end of the first tuning device 230 is grounded, and the resonant frequency of the second resonance can also be adjusted through the first tuning device 230. In some implementations, the antenna assembly further includes a second tuning device 231, one end of the second tuning device 231 is coupled with the fourth branch 2121, and the other end of the second tuning device 231 is grounded, and the resonant frequency of the first resonance can be adjusted through the second tuning device 231. For example, the first tuning device 230 and the second tuning device 231 can include capacitance and / or inductance.

[0258] Referring to FIG. 35c, the return loss diagram when the first tuning device 230 is 5nH and 10nH without the second tuning device 231, it can be known from FIG. 35c that the resonant frequency of the second resonance gradually decreases as the inductance value of the first tuning device gradually increases. Referring to FIG. 35d, the return loss diagram when the second tuning device 231 is 0.3pF and 0.6pF without the first tuning device 230, it can be known from FIG. 35d that the resonant frequency of the first resonance gradually decreases as the capacitance value of the second tuning device gradually increases.

[0259] Referring to FIG. 36a, in some embodiments, the antenna assembly can be a slot antenna, and accordingly, the antenna assembly includes the ground plate 202, the first branch 2101, and the second branch 2102, the first branch 2101 and the second branch 2102 are both arranged with a spacing from the ground plate 202, the first branch 2101 includes a first open end 2051 and a first ground end 2105, for example, the first open end 2051 and the first ground end 2105 can be two ends of the first branch 2101 along the length direction. The second branch 2102 includes a second open end 2052 and a second ground end 2107, for example, the second open end 2052 and the second ground end 2107 can be two ends of the second branch 2102 along the length direction. The extension directions of the first branch 2101 and the second branch 2102 can be arranged in parallel, and the first open end 2051 and the second open end 2052 are close to each other (the first open end 2051 and the second open end 2052 are arranged face to face), and the first open end 2051 and the second open end 2052 have a first slot 211 therebetween.

[0260] In the above implementations, the antenna assembly further includes a matching circuit 206, the matching circuit 206 is coupled with the first open end 2051 and the second open end 2052, the matching circuit 206 feeds signals to the first open end 2051 and the second open end 2052 in the form of anti-symmetrical feeding, so that the antenna assembly generates the first resonance and the second resonance, and the first resonance and the second resonance can both be quarter-mode. For example, the resonant frequency of the first resonance can be less than the resonant frequency of the second resonance.

[0261] It can be understood that the resonant frequency band of the first resonance and the resonant frequency band of the second resonance can cover the same communication frequency band to increase the bandwidth of the antenna assembly; or the resonant frequency band of the first resonance can cover the first communication frequency band, and the resonant frequency band of the second resonance can cover the second communication frequency band, the first communication frequency band and the second communication frequency band can be different, that is, the first resonance and the second resonance cover different communication frequency bands, which can also increase the bandwidth of the antenna assembly.

[0262] In the embodiment of the application, the matching circuit 206 feeds signals to the first open end 2051 and the second open end 2052 in the form of anti-symmetrical feeding. For example, the radio frequency device can feed the antenna assembly through a coaxial cable. Correspondingly, the inner conductor of the coaxial cable can be coupled with the second open end 2052, and the outer conductor of the coaxial cable can be coupled with the first open end 2051. The outer conductor can be grounded, and the inner conductor is used to feed the second open end 2052, so that the antenna assembly generates the first resonance and the second resonance. Of course, the radio frequency device can also feed the antenna assembly through a balun (balanced to unbalanced, Balun for short). The balun has a first output end and a second output end. The first output end is coupled with the first open end 2051, and the second output end is coupled with the second open end 2052 through the matching circuit 206. The signal output by the first output end is equal in amplitude and 180 degrees or so in phase to the signal output by the second output end, so that the antenna assembly can generate the first resonance and the second resonance.

[0263] The matching circuit 206 can include a first inductor 2065, one end of the first inductor 2065 coupled to the first open end 2051, and the other end of the first inductor 2065 coupled to the second open end 2052. The inner conductor of the coaxial cable or the second output end of the transducer can be coupled to the second open end 2052 through the first inductor 2065. By setting the first inductor 2065, the coupling between the first branch 2101 and the second branch 2102 can be small (weak coupling), and thus the magnetic current directions on the first branch 2101 and the second branch 2102 at the first resonance are the same, i.e., the mode of the antenna assembly is the DM mode (slot DM mode). Similarly, the magnetic current directions on the first branch 2101 and the second branch 2102 at the second resonance are the same, i.e., the mode of the antenna assembly is the DM mode (slot DM mode). Since the magnetic current directions on the first branch 2101 and the second branch 2102 at the first resonance and the second resonance are the same, the dips in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, and thus the communication performance of the antenna assembly can be improved. In some implementations, the matching circuit 206 further includes a first capacitor 2064, one end of the first capacitor 2064 coupled to the first open end 2151, and the other end of the first capacitor 2064 coupled to the second open end 2152. The impedance matching of the antenna assembly can be achieved through the first capacitor 2064.

[0264] With continued reference to FIG. 36a, at the first resonance, the signal is mainly radiated outward by the second branch 2102, i.e., the antenna assembly is the DM mode biased to the right branch radiation at the first resonance, and the antenna assembly is a quarter wavelength mode. At the second resonance, the signal is mainly radiated outward by the first branch 2101, i.e., the antenna assembly is the DM mode biased to the left branch radiation at the second resonance, and the antenna assembly is a quarter wavelength mode. At the first resonance and the second resonance, the first inductor 2065 can reduce the coupling between the first branch 2101 and the second branch 2102, and thus achieve weak coupling between the first branch 2101 and the second branch 2102.

[0265] Referring to FIG. 36b, in some embodiments, the antenna assembly can also be a slot antenna. Accordingly, the antenna assembly includes the ground plate 202, a first branch 2101 and a second branch 2102. The first branch 2101 and the second branch 2102 are both spaced apart from the ground plate 202. The first branch 2101 includes a first open end 2051 and a first ground end 2105. For example, the first open end 2051 and the first ground end 2105 can be two ends of the first branch 2101 along a length direction. The second branch 2102 includes a second open end 2052 and a second ground end 2107. For example, the second open end 2052 and the second ground end 2107 can be two ends of the second branch 2102 along the length direction. The first branch 2101 and the second branch 2102 can be arranged in parallel. The first open end 2051 and the second open end 2052 are close to each other (i.e., the first open end 2051 and the second open end 2052 are arranged face to face). The first open end 2051 and the second open end 2052 have a first slot 211 therebetween.

[0266] In the above implementation, the antenna assembly further includes a matching circuit 206. The matching circuit 206 is coupled to the first open end 2051 and the second open end 2052. The matching circuit 206 feeds signals to the first open end 2051 and the second open end 2052 in an anti-symmetrical feeding mode, so that the antenna assembly generates a first resonance and a second resonance. The first resonance and the second resonance can both be a quarter-mode resonance. For example, the resonance frequency of the first resonance can be less than the resonance frequency of the second resonance.

[0267] It can be understood that the resonance frequency band of the first resonance and the resonance frequency band of the second resonance can cover the same communication frequency band, so as to increase the bandwidth of the antenna assembly. Alternatively, the resonance frequency band of the first resonance can cover a first communication frequency band, and the resonance frequency band of the second resonance can cover a second communication frequency band. The first communication frequency band and the second communication frequency band can be different, i.e., the first resonance and the second resonance cover different communication frequency bands, which can also increase the bandwidth of the antenna assembly.

[0268] In the embodiments of the present application, the matching circuit 206 feeds signals to the first open end 2051 and the second open end 2052 in the form of anti-symmetrical feeding. For example, the radio frequency device can feed the antenna assembly through a coaxial cable. Correspondingly, the inner conductor of the coaxial cable can be coupled with the second open end 2052, and the outer conductor of the coaxial cable can be coupled with the first open end 2051. The outer conductor can be grounded, and the inner conductor feeds the second open end 2052, so that the antenna assembly generates the first resonance and the second resonance. Of course, the radio frequency device can also feed the antenna assembly through a balun (balanced to unbalanced, Balun for short). The balun has a first output end and a second output end. The first output end is coupled with the first open end 2051, and the second output end is coupled with the second open end 2052 through the matching circuit 206. The signal output by the first output end is equal in amplitude and 180 degrees out of phase with the signal output by the second output end, so that the antenna assembly can generate the first resonance and the second resonance.

[0269] The matching circuit 206 can include a first capacitor 2064. One end of the first capacitor 2064 is coupled with the first open end 2051, and the other end of the first capacitor 2064 is coupled with the second open end 2052. The inner conductor of the coaxial cable or the second output end of the balun can be coupled with the second open end 2052 through the first capacitor 2064. By setting the first capacitor 2064, the coupling between the first branch 2101 and the second branch 2102 can be small (weak coupling), so that the magnetic current directions on the first branch 2101 and the second branch 2102 are the same at the first resonance, that is, the mode of the antenna assembly is the DM mode (slot DM mode). Similarly, the magnetic current directions on the first branch 2101 and the second branch 2102 are the same at the second resonance, that is, the mode of the antenna assembly is the DM mode (slot DM mode). Since the magnetic current directions on the first branch 2101 and the second branch 2102 are the same at the first resonance and the second resonance, the dips in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, and the communication performance of the antenna assembly can be improved. In some implementations, the matching circuit 206 further includes a first inductor 2065. One end of the first inductor 2065 is coupled with the first open end 2151, and the other end of the first inductor 2065 is coupled with the second open end 2152. The impedance matching of the antenna assembly can be achieved through the first inductor 2065.

[0270] With reference back to FIG. 36b, at the first resonance, the signal is mainly radiated outward by the second branch 2102, i.e., the antenna assembly is a DM mode of the right-side branch radiation at the first resonance, and the antenna assembly is a quarter wavelength mode. At the second resonance, the signal is mainly radiated outward by the first branch 2101, i.e., the antenna assembly is a DM mode of the left-side branch radiation at the second resonance, and the antenna assembly is a quarter wavelength mode. At the first resonance and the second resonance, the first inductor 2065 can reduce the coupling amount between the first branch 2101 and the second branch 2102, thereby achieving weak coupling between the first branch 2101 and the second branch 2102.

[0271] With reference to FIGS. 36a and 36b, in some embodiments, the extension directions of the first branch 2101 and the second branch 2102 are parallel, and the lengths of the first branch 2101 and the second branch 2102 can be equal, i.e., the lengths of the antenna branches 201 on the left and right sides of the first gap 211 are equal.

[0272] Of course, in other embodiments, the lengths of the first branch 2101 and the second branch 2102 can also be unequal, the length of the first branch 2101 can be less than the length of the second branch 2102, or the length of the first branch 2101 can be greater than the length of the second branch 2102, which is not limited in the embodiments of the present application. In the implementation in which the length of the first branch 2101 is unequal to the length of the second branch 2102, the difference between the length of the first branch 2101 and the length of the second branch 2102 can be 2 mm-6 mm (such as 2 mm, 4 mm, 6 mm, etc.).

[0273] It can be understood that as the length of the first branch 2101 gradually increases, the resonance frequency of the second resonance gradually decreases; as the length of the second branch 2102 gradually increases, the resonance frequency of the first resonance gradually decreases.

[0274] With reference to FIG. 36c, in some embodiments which can include the above-mentioned embodiments, the antenna assembly further includes a first tuning device 208, one end of the first tuning device 208 is coupled with the first branch 2101, and the other end of the first tuning device 208 is configured to be grounded, and the first tuning device 208 is used to adjust the resonance frequency of the second resonance. In this way, the resonance frequency of the second resonance can be adjusted through the first tuning device 208, thereby adjusting the communication frequency band covered by the second resonance frequency band, so that the antenna assembly can adapt to different communication frequency bands.

[0275] In some implementations, the antenna assembly can further include a first switching device, and the first tuning device 208 is coupled with the first branch 2101 through the first switching device. In this way, whether the first tuning device 208 is coupled with the first branch 2101 can be controlled through the first switching device, thereby realizing control of the second resonance frequency.

[0276] In some embodiments, the antenna assembly can further comprise a second tuning device 209, one end of the second tuning device 209 is coupled with the second branch 2102, and the other end of the second tuning device 209 is configured to be grounded, and the second tuning device 209 is configured to adjust the resonant frequency of the first resonance. In this way, the resonant frequency of the first resonance can be adjusted by the second tuning device 209, and the communication frequency band covered by the first resonance frequency band can be adjusted, so that the antenna assembly can adapt to different communication frequency bands.

[0277] In some embodiments, the antenna assembly can further comprise a second switching device, and the second tuning device 209 is coupled with the second branch 2102 through the second switching device. In this way, the coupling between the second tuning device 209 and the second branch 2102 can be controlled by the second switching device, and the control of the first resonant frequency can be realized.

[0278] Please refer to FIG. 36d, in some embodiments, the antenna assembly further comprises a sixth tuning device 224, under the first resonance and the second resonance, the second branch 2102 has a current null point, and a gap 225 is arranged at the current null point; the second branch 2102 on both sides of the gap 225 is coupled through the sixth tuning device 224. In this way, the antenna assembly can also excite a third resonance, the resonant frequency of the third resonance can be higher than the resonant frequency of the first resonance and the resonant frequency of the second resonance, the mode of the third resonance can be CM mode, and the third resonance can cover the same communication frequency band as the first resonance and / or the second resonance, or the third resonance and the communication frequency bands covered by the first resonance and the second resonance are all different, thereby increasing the bandwidth of the antenna assembly.

[0279] In the above implementation, the current null point can be a region near the position where the current of the second branch 2102 is close to zero. It can be understood that the resonant frequency of the third resonance can be adjusted by the sixth tuning device 224, and the sixth tuning device 224 can include capacitance and / or inductance. In the implementation in which the sixth tuning device 224 includes inductance, as the inductance value of the inductance gradually increases, the resonant frequency of the third resonance gradually decreases.

[0280] Please refer to FIG. 37, in the implementation in which the antenna assembly is arranged in the bezel 112 shown in FIG. 1, the bezel 112 can include a first bezel 113, a second bezel 114, and a third bezel 115, the first bezel 113 is located between the second bezel 114 and the third bezel 115, and the second bezel 114 and the third bezel 115 are arranged in parallel; accordingly, the first branch 2101 can be located on the first bezel 113 and the second bezel 114, and the second branch 2102 can be located on the first bezel 113 and the third bezel 115, so as to ensure that the first branch 2101 and the second branch 2102 can have sufficient length.

[0281] Figure 38 is a return loss curve of the antenna assembly shown in Figure 37, from which it can be seen that the antenna assembly can generate a first resonance and a second resonance, the resonance frequency of the first resonance being about 0.71 GHz, and the resonance frequency of the second resonance being about 0.82 GHz. Figure 39 is an antenna efficiency curve of the antenna assembly shown in Figure 37, from which it can be seen that at the first resonance and the second resonance, there is no obvious dip in the radiation efficiency curve and the system efficiency curve of the antenna assembly, thereby improving the communication performance of the antenna assembly.

[0282] In some embodiments, the first grounding end 2105 can be directly coupled with the floor 202 (as shown in Figure 36a), and of course the first grounding end 2105 can also be coupled with the floor 202 through an inductor or the like, thereby achieving grounding. Referring to Figure 40, in the implementation manner in which the first grounding end 2105 is grounded through an inductor, the antenna assembly further includes a second inductor 217 and a third branch 2103, the first grounding end 2105 is grounded through the second inductor 217, one end of the third branch 2103 is coupled with the first grounding end 2105, and the other end of the third branch 2103 is an open end.

[0283] In this way, at the first resonance and the second resonance, the direction of the magnetic current on the third branch 2103 is the same as that on the first branch 2101, which can improve the efficiency bandwidth of the antenna assembly. It can be understood that since the signal at the second resonance is mainly radiated outward by the first branch 2101, the provision of the third branch 2103 can significantly improve the efficiency bandwidth of the second resonance; in addition, by adjusting the inductance value of the second inductor 217, the resonance frequency of the second resonance can be changed, and as the inductance value of the second inductor 217 gradually increases, the resonance frequency of the second resonance gradually decreases.

[0284] For example, the extension direction of the third branch 2103 can be parallel to the extension direction of the first branch 2101, and the first branch 2101 and the third branch 2103 can be located on substantially the same straight line, the length of the third branch 2103 being less than or equal to one quarter of the wavelength corresponding to the communication frequency, such as one sixth or one eighth of the wavelength corresponding to the communication frequency. It can be understood that the communication frequency can be the center frequency of the communication frequency band of the antenna assembly.

[0285] In the above implementation, the second ground end 2107 can be directly coupled with the floor 202 (as shown in FIG. 40), and of course the second ground end 2107 can also be coupled with the floor 202 through an inductor or the like to achieve grounding. Referring to FIGS. 41 and 42, in the implementation in which the second ground end 2107 is grounded through an inductor, the antenna assembly further includes a third inductor 218 and a fourth branch 2121, the second ground end 2107 is grounded through the third inductor 218, one end of the fourth branch 2121 is coupled with the second ground end 2107, and the other end of the fourth branch 2121 is an open end.

[0286] In this way, under the first resonance and the second resonance, the magnetic current direction on the fourth branch 2121 is the same as the magnetic current direction on the second branch 2102, which can improve the efficiency bandwidth of the antenna assembly. It can be understood that, since the signal under the first resonance is mainly radiated outward by the second branch 2102, the setting of the fourth branch 2121 can significantly improve the efficiency bandwidth of the first resonance; in addition, the resonant frequency of the first resonance can be changed by adjusting the inductance value of the third inductor 218, and as the inductance value of the third inductor 218 gradually increases, the resonant frequency of the first resonance gradually decreases.

[0287] For example, the extension direction of the fourth branch 2121 can be parallel to the extension direction of the second branch 2102, and the second branch 2102 and the fourth branch 2121 can be located on substantially the same straight line, and the length of the fourth branch 2121 is less than or equal to one quarter of the wavelength corresponding to the communication frequency, such as one sixth or one eighth of the wavelength corresponding to the communication frequency. It can be understood that the communication frequency can be the center frequency of the communication frequency band of the antenna assembly.

[0288] In some embodiments, the first ground end 2105 and the second ground end 2107 can also be grounded through a capacitor, and the magnetic current direction on the third branch 2103 can also be the same as the magnetic current direction on the first branch 2101 under the first resonance and the second resonance, and the magnetic current direction on the fourth branch 2121 can also be the same as the magnetic current direction on the second branch 2102; thereby improving the efficiency bandwidth of the antenna assembly.

[0289] It can be understood that the resonant frequency of the second resonance can be adjusted by adjusting the capacitance value of the capacitor coupled with the first ground end 2105, and as the capacitance value of the capacitor gradually increases, the resonant frequency of the second resonance gradually decreases; the resonant frequency of the first resonance can be adjusted by adjusting the capacitance value of the capacitor coupled with the second ground end 2107, and as the capacitance value of the capacitor gradually increases, the resonant frequency of the first resonance gradually decreases.

[0290] Please refer to FIG. 43, in some embodiments, the antenna assembly further comprises a third tuning device 215, one end of the third tuning device 215 is coupled with the third branch 2103, and the other end of the third tuning device 215 is configured to be grounded. Since the signal under the second resonance is mainly radiated outward by the first branch 2101 coupled with the third branch 2103, the third tuning device 215 is arranged to adjust the resonance frequency of the second resonance. In this way, the resonance frequency of the second resonance is adjusted, and the communication frequency of the antenna assembly is adjusted. For example, the third tuning device 215 can include a capacitor and / or an inductor. In the implementation where the third tuning device 215 includes a capacitor and an inductor, the capacitor and the inductor can be connected in series or in parallel, and the embodiments of the present application do not limit this.

[0291] In some implementations, the antenna assembly further comprises a fourth tuning device 216, one end of the fourth tuning device 216 is coupled with the fourth branch 2121, and the other end of the fourth tuning device 216 is configured to be grounded. Since the signal under the first resonance is mainly radiated outward by the second branch 2102 coupled with the fourth branch 2121, the fourth tuning device 216 is arranged to adjust the resonance frequency of the first resonance. In this way, the resonance frequency of the first resonance is adjusted, and the communication frequency of the antenna assembly is adjusted. For example, the fourth tuning device 216 can include a capacitor and / or an inductor. In the implementation where the fourth tuning device 216 includes a capacitor and an inductor, the capacitor and the inductor can be connected in series or in parallel, and the embodiments of the present application do not limit this.

[0292] Please refer to FIG. 44, in some embodiments, the antenna assembly comprises a third tuning device 215 and a fourth tuning device 216, one end of the third tuning device 215 is coupled with the first branch 2101, and the other end of the third tuning device 215 is configured to be grounded. One end of the fourth tuning device 216 is coupled with the second branch 2102, and the other end of the fourth tuning device 216 is configured to be grounded. In this way, the resonance frequency of the second resonance is adjusted by the third tuning device 215, and the resonance frequency of the first resonance is adjusted by the fourth tuning device 216.

[0293] For example, the third tuning device 215 can be coupled with the third branch 2103 through a third switching device to control whether the third tuning device 215 is coupled with the third branch 2103 or not. The fourth tuning device 216 can be coupled with the fourth branch 2121 through a fourth switching device to control whether the fourth tuning device 216 is coupled with the fourth branch 2121 or not.

[0294] Please refer to Figure 45, in the implementation manner that the antenna assembly comprises the third branch 2103, the antenna assembly further comprises a fifth branch 2122 and a fifth tuning device 222, the fifth branch 2122 is arranged on the side of the third branch 2103 away from the first branch 2101, and a second gap 213 is formed between one end of the fifth branch 2122 and the other end of the third branch 2103; one end of the fifth tuning device 222 is coupled with the fifth branch 2122, and the other end of the fifth tuning device 222 is configured to be grounded, and the fifth tuning device 222 is used for adjusting the resonant frequency of the second resonance.

[0295] In this way, under the first resonance and the second resonance, the magnetic current direction on the fifth branch 2122 is the same as the magnetic current direction on the first branch 2101 and the third branch 2103, and the efficiency bandwidth of the antenna assembly can be improved. It can be understood that, since the signal is mainly radiated outward by the first branch 2101 under the second resonance, the fifth branch 2122 can significantly improve the efficiency bandwidth of the second resonance; in addition, the resonant frequency of the second resonance can be adjusted through the fifth tuning device 222.

[0296] For example, the fifth tuning device 222 can comprise a capacitor and / or an inductor, and in the implementation manner that the fifth tuning device 222 comprises the capacitor and the inductor, the capacitor and the inductor can be connected in series or in parallel, and the embodiments of the present application do not make any limitation in this aspect.

[0297] Please refer to Figure 46, in the implementation manner that the antenna assembly comprises the fourth branch 2121, the antenna assembly further comprises a sixth branch 2123 and a sixth tuning device 224, the sixth branch 2123 is arranged on the side of the fourth branch 2121 away from the second branch 2102, and a third gap 214 is formed between one end of the sixth branch 2123 and the other end of the fourth branch 2121; one end of the sixth tuning device 224 is coupled with the sixth branch 2123, and the other end of the sixth tuning device 224 is configured to be grounded, and the sixth tuning device 224 is used for adjusting the resonant frequency of the first resonance. In this way, under the first resonance and the second resonance, the magnetic current direction on the sixth branch 2123 is the same as the magnetic current direction on the second branch 2102 and the fourth branch 2121, and the efficiency bandwidth of the antenna assembly can be improved.

[0298] It can be understood that, since the signal is mainly radiated outward by the second branch 2102 under the first resonance, the sixth branch 2123 can significantly improve the efficiency bandwidth of the first resonance; in addition, the resonant frequency of the first resonance can be adjusted through the sixth tuning device 224.

[0299] For example, the sixth tuning device 224 can comprise a capacitor and / or an inductor, and in the implementation manner that the sixth tuning device 224 comprises the capacitor and the inductor, the capacitor and the inductor can be connected in series or in parallel, and the embodiments of the present application do not make any limitation in this aspect.

[0300] For example, the fifth tuning device 222 can be coupled with the fifth branch 2122 through a fifth switch device to control whether the fifth tuning device 222 is coupled with the fifth branch 2122 or not; the sixth tuning device 224 can be coupled with the sixth branch 2123 through a sixth switch device to control whether the sixth tuning device 224 is coupled with the sixth branch 2123 or not.

[0301] Please refer to FIG. 47, in the above implementation, the other end of the fifth branch 2122 can be an open end, or the other end of the fifth branch 2122 can be a ground end, and the embodiments of the present application do not limit this. For example, in the implementation that the electronic device 10 (as shown in FIG. 1) is a mobile phone, the first branch 2101, the second branch 2102, the third branch 2103 and the fourth branch 2121 can be all arranged on the first bezel 113 which has a smaller length in the bezel 112, the fifth branch 2122 can be arranged on the second bezel 114 which has a larger length and is adjacent to the first bezel 113, the sixth branch 2123 can be arranged on the third bezel 115, the length of the third bezel 115 is equal to the length of the second bezel 114, and the first bezel 113 is located between the second bezel 114 and the third bezel 115.

[0302] Please refer to FIG. 48, in some embodiments, the antenna assembly includes the ground plate 202, the first branch 2101 and the second branch 2102, the first branch 2101 includes oppositely arranged first ground end and second ground end, the second branch 2102 is arranged in parallel and spaced apart from the first branch 2101, for example, the second branch 2102 can be located between the first branch 2101 and the ground plate 202 (the second branch 2102 is located on the inner side of the first branch 2101), or the second branch 2102 is located on the side of the first branch 2101 away from the ground plate 202 (the second branch 2102 is located on the outer side of the first branch 2101). The first branch 2101 is spaced apart along its length direction to arrange the first connection point and the second connection point, one end of the second branch 2102 is coupled with the first connection point, the other end of the second branch 2102 is coupled with the second connection point, and the first slot 211 is arranged on the second branch 2102.

[0303] In the above implementation, the antenna assembly further comprises a matching circuit 206, the matching circuit 206 is coupled with the second stub 2102 at two ends of the first slot 211, and the matching circuit 206 feeds signals to the second stub 2102 at two ends of the first slot 211 in the form of anti-symmetrical feeding, so that the antenna assembly generates the first resonance and the second resonance. For example, the radio device can feed the antenna assembly through a coaxial cable, and accordingly, the inner conductor of the coaxial cable can be coupled with the second stub 2102 at one end of the first slot 211, and the outer conductor of the coaxial cable can be coupled with the second stub 2102 at the other end of the first slot 211, so that the antenna assembly generates the first resonance and the second resonance. Of course, the radio device can also feed the antenna assembly through a balun (balanced to unbalanced, Balun for short), the balun has a first output end and a second output end, the first output end is coupled with the second stub 2102 at one end of the first slot 211, and the second output end is coupled with the second stub 2102 at the other end of the first slot 211 through the matching circuit 206, the signal output by the first output end is equal in amplitude and 180 degrees or so out of phase with the signal output by the second output end, so that the antenna assembly can generate the first resonance and the second resonance.

[0304] The matching circuit 206 can include a first capacitor 2064, the second stub 2102 at two sides of the first slot 211 is coupled through the first capacitor 2064, and the inner conductor of the coaxial cable or the second output end of the balun can be coupled with the second stub 2102 at one end of the first slot 211 through the first capacitor 2064. By setting the first capacitor 2064, the coupling amount between the first stub 2101 and the second stub 2102 can be small (weak coupling), and thus the magnetic current directions on the first stub 2101 and the second stub 2102 can be the same at the first resonance, that is, the mode of the antenna assembly is DM mode (slot DM mode); similarly, the magnetic current directions on the first stub 2101 and the second stub 2102 are the same at the second resonance, that is, the mode of the antenna assembly is DM mode (slot DM mode). Since the magnetic current directions on the first stub 2101 and the second stub 2102 are the same at the first resonance and the second resonance, the dip in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, and thus the communication performance of the antenna assembly can be improved.

[0305] In the above implementation, the difference between the first resonance frequency and the second resonance frequency can be adjusted by adjusting the position of the first slot 211 on the second stub 2102. For example, the first slot 211 can be located on one side of the midpoint of the extension direction of the second stub 2102, and thus the first resonance frequency and the second resonance frequency are not equal.

[0306] In some embodiments, the matching circuit 206 further includes a first inductor 2065, and the second stub 2102 on both sides of the first slot 211 is further coupled through the first inductor 2065, so as to realize impedance matching of the antenna assembly.

[0307] With continuous reference to FIG. 48, at the first resonance, the signal is mainly radiated outward by the first stub 2101 and the second stub 2102 on the right side of the first slot 211, i.e., the antenna assembly is in a DM mode of right-side stub radiation at the first resonance, and the antenna assembly is in a quarter wavelength mode. At the second resonance, the signal is mainly radiated outward by the first stub 2101 and the second stub 2102 on the left side of the first slot 211, i.e., the antenna assembly is in a DM mode of left-side stub radiation at the second resonance, and the antenna assembly is in a quarter wavelength mode.

[0308] Please refer to FIG. 49a, in some embodiments, the antenna assembly further includes a first tuning device 208, one end of the first tuning device 208 is coupled with the second ground terminal, and the other end of the first tuning device 208 is grounded; the first tuning device 208 is used for adjusting the resonance frequency of the second resonance. The resonance frequency of the second resonance can be adjusted through the first tuning device 208, and thus the corresponding communication frequency band of the second resonance can be adjusted. For example, the first tuning device 208 can include a capacitor and / or an inductor, and the embodiments of the present application do not limit the first tuning device 208. When the resonance frequency of the second resonance is adjusted, the resonance frequency of the first resonance hardly changes, and in the implementation mode in which the first tuning device 208 is an inductor, the resonance frequency of the second resonance can be reduced by increasing the inductance value of the first tuning device 208.

[0309] And / or, the antenna assembly further includes a second tuning device 209, one end of the second tuning device 209 is coupled with the first ground terminal, and the other end of the second tuning device 209 is grounded; the second tuning device 209 is used for adjusting the resonance frequency of the first resonance. The resonance frequency of the first resonance can be adjusted through the second tuning device 209, and thus the corresponding communication frequency band of the first resonance can be adjusted. For example, the second tuning device 209 can include a capacitor and / or an inductor, and the embodiments of the present application do not limit the second tuning device 209. When the resonance frequency of the first resonance is adjusted, the resonance frequency of the second resonance hardly changes, and in the implementation mode in which the second tuning device 209 is a capacitor, the resonance frequency of the first resonance can be reduced by increasing the capacitance value of the first tuning device 208.

[0310] It can be understood that, in the above implementation mode, the first tuning device 208 can be coupled with the first ground terminal through a first switch, and the second tuning device 209 can be coupled with the second ground terminal through a second switch, so as to facilitate control.

[0311] In some implementations, the antenna assembly further includes a first connecting branch 226, which is parallel to the first branch 2101, and coupled to the first ground end at one end close to the first ground end, and open at the other end. The efficiency bandwidth of the second resonance can be adjusted by the first connecting branch 226.

[0312] In some implementations, the antenna assembly further includes a second connecting branch 227, which is parallel to the second branch 2102, and coupled to the second ground end at one end close to the second ground end, and open at the other end. The efficiency bandwidth of the first resonance can be adjusted by the second connecting branch 227.

[0313] In other embodiments, as shown in FIG. 49b, one end of the first tuning device 208 can be coupled to the second branch 2102 at one end close to the second ground end, and the other end of the first tuning device 208 can be grounded; one end of the second tuning device 209 can be coupled to the second branch 2102 at one end close to the first ground end, and the other end of the second tuning device 209 can be grounded. The resonance frequency of the second resonance can be adjusted by the first tuning device 208, and the resonance frequency of the first resonance can be adjusted by the second tuning device 209. The first tuning device 208 and the second tuning device 209 can include a capacitor and / or an inductor.

[0314] In implementations without the second tuning device 209, and with the first tuning device 208 being an inductor, as the inductance of the first tuning device 208 increases, the resonance frequency of the second resonance decreases, as shown in FIG. 49c. In implementations without the first tuning device 208, and with the second tuning device 209 being a capacitor, as the capacitance of the second tuning device 209 increases, the resonance frequency of the first resonance decreases, as shown in FIG. 49d.

[0315] In some embodiments, as shown in FIG. 50, the antenna assembly includes a ground plane 202, and a first branch 2101 and a second branch 2102 disposed on the ground plane 202. The first branch 2101 includes a first ground end and a first open end disposed opposite to each other, and the second branch 2102 includes a second ground end and a second open end disposed opposite to each other. The first branch 2101 and the second branch 2102 can be parallel to each other, and the first ground end can be disposed facing the second ground end.

[0316] The antenna assembly further comprises a feeding structure, which feeds the first branch 2101 and the second branch 2102 in the form of anti-symmetrical feeding, so that the antenna assembly generates the first resonance and the second resonance. For example, the radio frequency device can feed the antenna assembly through a coaxial cable, and accordingly, the inner conductor of the coaxial cable can be coupled with the first branch 2101, and the outer conductor of the coaxial cable can be coupled with the second branch 2102, so that the antenna assembly generates the first resonance and the second resonance. Of course, the radio frequency device can also feed the antenna assembly through a balun (balanced to unbalanced, for short), which has a first output end and a second output end, the first output end is coupled with the first branch 2101, and the second output end is coupled with the second branch 2102, the signal output by the first output end has the same amplitude as the signal output by the second output end, and the phase difference is about 180°, so that the antenna assembly can generate the first resonance and the second resonance.

[0317] In the above implementation manner, the antenna assembly further comprises a first capacitor 2064, one end of the first capacitor 2064 is coupled with the first ground end, and the other end of the first capacitor 2064 is coupled with the second ground end. By arranging the first capacitor 2064, the coupling amount between the first branch 2101 and the second branch 2102 can be small (weak coupling), and thus the magnetic current directions on the first branch 2101 and the second branch 2102 can be the same at the first resonance; similarly, the magnetic current directions on the first branch 2101 and the second branch 2102 are the same at the second resonance. Since the magnetic current directions on the first branch 2101 and the second branch 2102 are the same at the first resonance and the second resonance, the dip in the antenna efficiency (radiation efficiency and / or system efficiency) curve can be reduced or eliminated, and thus the communication performance of the antenna assembly can be improved.

[0318] At the first resonance and the second resonance, the current directions on the first branch 2101 and the second branch 2102 are opposite, at the first resonance, the signal is mainly radiated outward by the second branch 2102, that is, the antenna assembly is biased to the right side branch at the first resonance. At the second resonance, the signal is mainly radiated outward by the first branch 2101, that is, the antenna assembly is biased to the left side branch at the second resonance.

[0319] It can be understood that the difference (frequency ratio) between the resonance frequency of the first resonance and the resonance frequency of the second resonance can be adjusted by adjusting the lengths of the first branch 2101 and the second branch 2102. For example, the length of the first branch 2101 can be smaller than the length of the second branch 2102, or the length of the first branch 2101 can be greater than the length of the second branch 2102, and the embodiments of the present application do not make a prior limitation in this regard.

[0320] In some embodiments, the antenna assembly further comprises a ground branch 203, one end of the ground branch 203 is coupled with the first ground terminal and the second ground terminal, and the other end of the ground branch 203 is grounded. In this way, the first ground terminal and the second ground terminal are grounded through the same ground branch 203, which can simplify the structure of the antenna assembly and facilitate the manufacture of the antenna assembly.

[0321] Please refer to FIG. 51, in other embodiments, the antenna assembly further comprises a first ground branch 210 and a second ground branch 212, the first ground terminal and the second ground terminal are spaced apart, one end of the first ground branch 210 is coupled with the first ground terminal, and the other end of the first ground branch 210 is grounded, one end of the second ground branch 212 is coupled with the second ground terminal, and the other end of the second ground branch 212 is grounded.

[0322] In this way, the first ground terminal is grounded through the first ground branch 210, and the second ground branch 212 is grounded through the second ground branch 212, and the distance between the first branch 2101 and the second branch 2102 can be adjusted by adjusting the position between the first ground branch 210 and the second ground branch 212.

[0323] In some implementations, the feed structure comprises a matching circuit, and the matching circuit comprises a first inductor 2065, one end of the first inductor 2065 is coupled with the first ground terminal, and the other end of the first inductor 2065 is coupled with the second ground terminal. The impedance matching of the antenna assembly can be realized through the first inductor 2065.

[0324] For example, the radio frequency device can feed the antenna assembly through a coaxial cable, and accordingly, the inner conductor of the coaxial cable can be coupled with the first branch 2101, and the outer conductor of the coaxial cable can be coupled with the second branch 2102 through the first inductor 2065, so that the antenna assembly can generate the first resonance and the second resonance. Of course, the radio frequency device can also feed the antenna assembly through a balun (balanced to unbalanced, Balun for short), the balun has a first output terminal and a second output terminal, the first output terminal is coupled with the first branch 2101, and the second output terminal is coupled with the second branch 2102 through the first inductor 2065, the signal output by the first output terminal is equal in amplitude and 180° or so out of phase with the signal output by the second output terminal, so that the antenna assembly can generate the first resonance and the second resonance.

[0325] Please refer to FIG. 52a and FIG. 53, in other implementations, the feeding structure includes a floating branch 205 and a matching circuit, the floating branch 205 is parallel to and spaced apart from the first branch 2101 and the second branch 2102, the floating branch 205 can be located between the first branch 2101 and the ground 202 (inside), or the floating branch 205 is located on the side of the first branch 2101 away from the ground 202 (outside), the floating branch 205 covers at least part of the first branch 2101 and part of the second branch 2102. One end of the floating branch 205 is coupled to the first ground, and the other end of the floating branch 205 is coupled to the second ground branch 212; the floating branch 205 is provided with a first gap 211, and the matching circuit feeds signals to the floating branch 205 on both sides of the first gap 211 in the form of anti-symmetrical feeding. By feeding the first branch 2101 and the second branch 2102 through the floating branch 205, the difference (frequency ratio) between the resonant frequency of the first resonance and the resonant frequency of the second resonance can be further adjusted by adjusting the feeding position on the floating branch 205.

[0326] For example, the floating branch 205 can be provided with a break 225, and the radio device can feed the antenna assembly through a coaxial cable. Correspondingly, the inner conductor of the coaxial cable can be coupled to the floating branch 205 on one side of the break 225, and the outer conductor of the coaxial cable can be coupled to the floating branch 205 on the other side of the break 225, so that the antenna assembly can generate the first resonance and the second resonance. Of course, the radio device can also feed the antenna assembly through a balun (balanced to unbalanced, Balun for short). The balun has a first output and a second output, the first output is coupled to the floating branch 205 on one side of the break 225, and the second output is coupled to the floating branch 205 on the other side of the break 225, the signal output by the first output is equal in amplitude and 180° out of phase with the signal output by the second output, so that the antenna assembly can generate the first resonance and the second resonance. By adjusting the position of the break 225 on the floating branch 205, the frequency ratio of the first resonance and the second resonance can be adjusted, for example, the break 225 can be located on one side of the midpoint of the extension direction of the floating branch 205, so that the resonant frequency of the first resonance is not equal to the resonant frequency of the second resonance. As the distance between the break 225 and the midpoint increases, the frequency ratio of the first resonance and the second resonance gradually increases.

[0327] In some embodiments, the floating stub 205 can be directly coupled with the first ground terminal and the second ground terminal. In other embodiments, the antenna assembly further comprises a first tuning device 208, one end of the floating stub 205 is coupled with the first ground terminal through the first tuning device 208. In this way, the coupling between the first stub 2101 and the second stub 2102 can be adjusted through the first tuning device 208, and the impedance matching of the antenna assembly can also be achieved. For example, the first tuning device 208 can comprise a capacitor and / or an inductor, and the embodiments of the present application do not limit the first tuning device 208.

[0328] In addition, the antenna assembly further comprises a second tuning device 209, the other end of the floating stub 205 is coupled with the second ground terminal through the second tuning device 209. In this way, the coupling between the first stub 2101 and the second stub 2102 can be adjusted through the second tuning device 209, and the impedance matching of the antenna assembly can also be achieved. For example, the second tuning device 209 can comprise a capacitor and / or an inductor, and the embodiments of the present application do not limit the second tuning device 209.

[0329] In the above-mentioned embodiments, the first tuning device 208 can be coupled with the first ground terminal through a first switch, and the second tuning device 209 can be coupled with the second ground terminal through a second switch, so as to facilitate control.

[0330] Please refer to FIG. 52b, in some embodiments, the antenna assembly further comprises a first tuning device 230, one end of the first tuning device 230 is coupled with the first stub 2101, and the other end of the first tuning device 230 is grounded, and the resonance frequency of the second resonance can also be adjusted through the first tuning device 230. In some embodiments, the antenna assembly further comprises a second tuning device 231, one end of the second tuning device 231 is coupled with the second stub 2102, and the other end of the second tuning device 231 is grounded, and the resonance frequency of the first resonance can be adjusted through the second tuning device 231. For example, the first tuning device 230 and the second tuning device 231 can comprise a capacitor and / or an inductor.

[0331] Please refer to FIG. 52c, the return loss graph when the first tuning device 230 is 3nH and 10nH without the second tuning device 231, it can be known from FIG. 52c that the resonance frequency of the second resonance gradually decreases as the inductance value of the first tuning device gradually increases. Please refer to FIG. 52d, the return loss graph when the second tuning device 231 is 0.3pF and 0.6pF without the first tuning device 230, it can be known from FIG. 52d that the resonance frequency of the first resonance gradually decreases as the capacitance value of the second tuning device gradually increases.

[0332] Referring to Figure 54, in some embodiments, the antenna assembly further includes a first parasitic stub 228 and a third tuning device 215. The first parasitic stub 228 is disposed on the side of the first stub 2101 opposite to the second stub 2102, and is arranged parallel to the first stub 2101. A second gap 213 is formed between one end of the first parasitic stub 228 and the first open end, and the other end of the first parasitic stub 228 is an open end. One end of the third tuning device 215 is coupled to the first parasitic stub 228, and the other end of the third tuning device 215 is grounded. The first stub 2101 can couple a signal to the first parasitic stub 228, thereby adjusting the efficiency bandwidth of the second resonance.

[0333] For example, the third tuning device 215 may include a capacitor and / or an inductor, and the embodiments of this application do not limit the third tuning device 215.

[0334] And / or, the antenna assembly further includes a second parasitic stub 229 and a fourth tuning device 216. The second parasitic stub 229 is disposed on the side of the second stub 2102 opposite to the first stub 2101, and is arranged parallel to the second stub 2102. A third gap 214 is formed between one end of the second parasitic stub 229 and the second open end. The other end of the second parasitic stub 229 is an open end. One end of the fourth tuning device 216 is coupled to the second parasitic stub 229, and the other end of the fourth tuning device 216 is grounded. The second stub 2102 can couple a signal to the second parasitic stub 229, thereby adjusting the efficiency bandwidth of the first resonance.

[0335] For example, the fourth tuning device 216 may include a capacitor and / or an inductor, and the embodiments of this application do not limit the fourth tuning device 216.

[0336] It should be understood that the "common mode" or "CM mode" in the embodiments of this application includes line common mode and slot common mode, while the "differential mode" or "DM mode" in the embodiments of this application includes line differential mode and slot differential mode, which can be determined according to the structure of the antenna.

[0337] 1. Wire common mode (CM) mode

[0338] Figure 55 shows that the radiator 40 of the antenna is open at both ends and is connected to a feed circuit (not shown) at a middle position 41. In one embodiment, the feed of the radiator 40 is in the form of a symmetrical feed. The feed circuit can be connected to the middle position 41 of the radiator 40 through a feed line 42. It should be understood that the symmetrical feed can be understood as the feed circuit being connected to the radiator at one end and being coupled to the ground plane at the other end to achieve grounding, wherein the connection point (feed point) of the feed circuit to the radiator 40 is located at the center of the radiator 40, wherein the center of the radiator 40 can be, for example, the geometric center or the electrical length center (or a region within a certain range of the above-mentioned center).

[0339] The middle position 41 of the radiator 40 can be, for example, the geometric center of the radiator or the electrical length center of the radiator. In one embodiment, the feed line 42 is connected to the radiator 40 through a connecting member such as a spring, and the connecting member is connected to the radiator 40 at a position covering the middle position 41.

[0340] Figure 56 shows the current and electric field distribution of the antenna 40. As shown in Figure 56, the current is distributed in opposite directions on both sides of the middle position 41, for example, symmetrically; the electric field is distributed in the same direction on both sides of the middle position 41. As shown in Figure 56, the current at the feed line 42 is distributed in the same direction. Based on the same direction distribution of the current at the feed line 42, this feed shown in Figures 55 and 56 can be referred to as a line CM feed. Based on the opposite direction distribution of the current on both sides of the radiator, the antenna mode shown in Figure 56 can be referred to as a line CM mode (which can also be referred to as a CM mode, for example, for a line antenna, the CM mode refers to the line CM mode). The current and electric field shown in Figure 56 can be referred to as the current and electric field of the line CM mode, respectively.

[0341] 2. Line differential mode (DM) mode

[0342] Figure 57 shows that the radiator 50 is open at both ends and is connected to a feed circuit at a middle position 51. In one embodiment, the feed of the radiator 50 is in the form of an anti-symmetrical feed. One end of the feed circuit is connected to one part of the radiator 50 through a feed line 52, and the other end of the feed circuit is connected to another part of the radiator 50 through a feed line 52. The middle position 51 can include the geometric center of the radiator 50.

[0343] It should be understood that the "center anti-symmetrical feed" mentioned in the embodiments of the present application can be understood as the positive and negative poles of the feed unit being connected to the two connection points near the above-mentioned center point of the radiator. In one embodiment, the signal amplitudes output by the positive and negative poles of the feed unit are the same, and the phases are opposite, for example, the phases differ by 180°±10°.

[0344] Figure 58 shows the current, electric field distribution of the radiator 50. As shown in Figure 58, the current presents a same direction distribution, for example, an anti-symmetrical distribution, on both sides of the middle position 51 of the radiator 50; the electric field presents an opposite distribution on both sides of the middle position 51. As shown in Figure 58, the current at the feed line 52 presents an opposite distribution. Based on the opposite distribution of the current at the feed line 52, this kind of feed shown in Figure 57 can be referred to as a line DM feed. Based on the same direction distribution of the current on both sides of the radiator, this kind of antenna mode shown in Figure 58 can be referred to as a line DM mode (also can be simply referred to as a DM mode, for example, for a line antenna, the DM mode refers to a line DM mode). The current, electric field shown in Figure 58 can be referred to as the current, electric field of the line DM mode respectively.

[0345] 3. Slot CM mode

[0346] Figure 59 shows that the radiator of the antenna has a hollow slot or gap 61, or can be regarded as that the radiator 60 of the antenna and the floor (for example, the ground layer of the PCB) enclose the slot or gap 61. In an embodiment, the slot 61 can be formed by slotting on the floor. In an embodiment, the slot 61 can be enclosed by coupling the two ends of the radiator 60 with the floor. The slot 61 is provided with an opening 62 on one side, and the opening 62 can be specifically opened at the middle position of the side. The middle position of the side of the slot 61 may, for example, be the geometric midpoint of the radiator 60, or the midpoint of the electrical length of the radiator, for example, the region where the opening 62 is opened on the radiator covers the middle position of the side. The opening 62 can be connected with a feed circuit, and an anti-symmetrical feed is adopted. It should be understood that the anti-symmetrical feed can be understood as that the positive and negative poles of the feed circuit are connected to the two ends of the radiator respectively. The signal amplitudes of the positive and negative poles of the feed circuit are the same, and the phases are opposite, for example, the phases are opposite by 180°±10°.

[0347] Figure 60 shows the current, electric field, and magnetic current distribution on the radiator 60 (may also include a ground plane). As shown in Figure 60, the current on the conductor (e.g., the ground plane, and / or the radiator 60) around the slot 61 is co-directional around the slot 61, the electric field is anti-directional on both sides of the opening 61 of the slot 61, and the magnetic current is anti-directional on both sides of the middle of the slot 61. As shown in Figure 60, the electric field at the opening 62 (e.g., the feed) is co-directional, and the magnetic current at the opening 62 (e.g., the feed) is co-directional. Based on the co-directional magnetic current at the opening 62 (the feed), this type of feed shown in Figure 60 can be referred to as a slot CM feed. Based on the co-directional current on the radiator on both sides of the opening 62 (e.g., anti-symmetrical distribution), or based on the co-directional current on the conductor around the slot 61 around the slot 61, this type of antenna mode shown in Figure 60 can be referred to as a slot CM mode (may also be referred to as a CM mode, e.g., for a slot antenna, the CM mode refers to the slot CM mode). The electric field, current, and magnetic current distribution shown in Figure 60 can be referred to as the electric field, current, and magnetic current of the slot CM mode.

[0348] 4. Slot DM Mode

[0349] As shown in Figure 61, the slot or gap 72 in the radiator of the antenna is hollow, or can be considered that the slot or gap 72 is enclosed by the radiator 70 and the ground plane (e.g., the ground plane of the PCB). In one embodiment, the slot 72 can be formed by cutting a slot in the ground plane. In one embodiment, the slot 72 can be enclosed by coupling the two ends of the radiator 70 to the ground plane. The middle of the slot 72 is connected to the feed circuit, and symmetric feeding is used. It should be understood that symmetric feeding can be understood as that one end of the feed circuit is connected to the radiator, and the other end is coupled to the ground plane to achieve grounding, wherein the connection point (feed point) of the feed circuit and the radiator is located at the center of the radiator, which can be, for example, the geometric midpoint, or the electrical length midpoint (or a region within a certain range of the above-mentioned midpoints). The middle of one side of the slot 72 is connected to the positive pole of the feed circuit, and the middle of the other side of the slot 72 is connected to the negative pole of the feed circuit. The middle of the side of the slot 72 can be, for example, the middle of the radiator 70 and / or the middle of the ground plane, such as the geometric midpoint of the radiator 70, or the electrical length midpoint of the radiator, for example, the connection of the feed circuit and the radiator covers the middle 71 of the side.

[0350] Figure 62 shows the current, electric field, and magnetic current distribution on the radiator 70 (may also include a floor). As shown in Figure 62, on the conductor (such as the floor, and / or the radiator 70) around the slot 72, the current is distributed around the slot 72, and is distributed in opposite directions on both sides of the middle position of the slot 72, the electric field is distributed in the same direction on both sides of the middle position 71, and the magnetic current is distributed in the same direction on both sides of the middle position 71. The magnetic current at the feeding circuit is distributed in opposite directions (not shown). Based on the magnetic current at the feeding circuit being distributed in opposite directions, this feeding shown in Figure 61 can be referred to as a slot DM feeding. Based on the current being distributed in opposite directions (for example, symmetrically) on both sides of the radiator 70, or, based on the current being distributed in opposite directions (for example, symmetrically) around the slot 71, this antenna mode shown in Figure 62 can be referred to as a slot DM mode (may also be referred to simply as a DM mode, for example, for a slot antenna, the DM mode refers to a slot DM mode). The electric field, current, and magnetic current distribution shown in Figure 62 can be referred to as the electric field, current, and magnetic current of the slot DM mode.

[0351] The above description is merely that of specific embodiments of the present application, but the scope of the protection of the present application is not limited thereto. It will be readily obvious to those skilled in the art that various changes and / or modifications can be made thereto without departing from the scope of the present application, and it is intended to cover all such changes and / or modifications as falling within the scope of the present application. Therefore, the scope of the protection of the present application shall be limited only by the scope of the claims thereof.

Claims

1. An antenna assembly, characterized by The antenna assembly comprises: a floor; a floating branch, which is arranged in spaced relation to the floor, the floating branch comprising oppositely arranged first and second open ends, and a feeding point being arranged on the floating branch between the first and second open ends; a matching circuit, which is coupled to the feeding point, the matching circuit being configured to feed the feeding point to cause the antenna assembly to generate a first resonance and a second resonance, the matching circuit comprising a first matching capacitor, one end of the first matching capacitor being coupled to the feeding point, and the other end of the first matching capacitor being configured to be grounded.

2. The antenna assembly of claim 1, wherein, The distance between the feeding point and the midpoint of the floating branch along the extension direction of the floating branch is less than or equal to one fourth of the length of the floating branch along the extension direction of the floating branch, and the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is less than or equal to 300 MHz.

3. The antenna assembly of claim 2, wherein, The matching circuit further comprises a first matching inductor, one end of the first matching inductor being coupled to one end of the first matching capacitor, and the other end of the first matching inductor being configured to receive a radio frequency signal, and the other end of the first matching inductor being coupled to the feeding point.

4. The antenna assembly of claim 1, wherein, The distance between the feeding point and the first open end is less than or equal to one fourth of the length of the floating branch along the extension direction of the floating branch, and the frequency difference between the resonance frequency of the first resonance and the resonance frequency of the second resonance is greater than 300 MHz.

5. The antenna assembly of claim 4, wherein, The matching circuit further comprises a first matching inductor, one end of the first matching inductor being coupled to the other end of the first matching capacitor, and the other end of the first matching inductor being configured to be grounded, and the other end of the first matching capacitor being configured to receive a radio frequency signal.

6. The antenna assembly of any of claims 1-5, wherein, The antenna assembly further comprises a first grounding capacitor, and a first connection point being arranged on the floating branch, one end of the first grounding capacitor being coupled to the first connection point, and the other end of the first grounding capacitor being configured to be grounded, and the shortest distance between the first connection point and the midpoint of the floating branch along the extension direction of the floating branch is less than or equal to one eighth of the length of the floating branch along the extension direction of the floating branch, and the shortest distance between the first connection point and the feeding point is greater than or equal to 2 mm.

7. The antenna assembly of any of claims 1-5, wherein, The antenna assembly further comprises a first tuning device, one end of the first tuning device being coupled to a second connection point on the floating branch, and the other end of the first tuning device being configured to be grounded, and the distance between the second connection point and the first open end is 1 / 16-3 / 16 of the length of the floating branch along the extension direction of the floating branch, and the first tuning device is configured to adjust the resonance frequency of the second resonance. And / or, the antenna assembly further comprises a second tuning device, one end of the second tuning device being coupled to a third connection point on the floating branch, and the other end of the second tuning device being configured to be grounded, and the distance between the third connection point and the second open end is 1 / 16-3 / 16 of the length of the floating branch along the extension direction of the floating branch, and the second tuning device is configured to adjust the resonance frequency of the first resonance.

8. The antenna assembly of any of claims 1-7, wherein, The antenna assembly further includes a first ground branch and a first tuning device, one end of the first ground branch has a first gap between the first open end, the other end of the first ground branch is a ground end; one end of the first tuning device is coupled between the first open end, the other end of the first tuning device is coupled to one end of the first ground branch; And / or, the antenna assembly further includes a second ground branch and a second tuning device, one end of the second ground branch has a second gap between the second open end, the other end of the second ground branch is a ground end; one end of the second tuning device is coupled between the second open end, the other end of the second tuning device is coupled to one end of the second ground branch.

9. The antenna assembly of claim 8, wherein, The first ground branch and the second ground branch are arranged in parallel, the suspended branch is parallel to the first ground branch and the second ground branch, and the suspended branch is arranged in parallel to the first ground branch and the second ground branch, and the first ground branch and the second ground branch are arranged in parallel, and the suspended branch is arranged in parallel to the first ground branch and the second ground branch, and the suspended branch is arranged in parallel to the first ground branch and the second ground branch, and the first ground branch and the second ground branch have a third gap between them.

10. The antenna assembly of claim 8 or 9, wherein, The first ground branch includes: A first branch parallel to the suspended branch, one end of the first branch having the first gap between the first open end; A second branch, one end of the second branch being coupled to the other end of the first branch, the other end of the second branch being a ground end; A third branch parallel to the suspended branch, the first branch being located between the third branch and the suspended branch, one end of the third branch being coupled to the other end of the second branch, the other end of the third branch being an open end; The antenna assembly further includes a third tuning device, one end of the third tuning device being coupled to the third branch, the other end of the third tuning device being configured to be grounded.

11. The antenna assembly of claim 9 or 10, wherein, The antenna assembly further includes a second matching inductor, one end of the second matching inductor being coupled to one end of the first ground branch, the other end of the second matching inductor being coupled to one end of the second ground branch.

12. An antenna assembly, characterized by Including: A floor; A first branch arranged in parallel to the floor, the first branch including a first open end and a first ground end; A second branch arranged in parallel to the floor, the second branch including a second open end and a second ground end, the first open end and the second open end having a first gap therebetween; A matching circuit coupled to the first open end and the second open end, the matching circuit feeding signals to the first open end and the second open end in the form of anti-symmetrical feeding, so that the antenna assembly generates a first resonance and a second resonance; The matching circuit includes a first inductor, one end of the first inductor being coupled to the first open end, the other end of the first inductor being coupled to the second open end.

13. The antenna assembly of claim 12, wherein, The antenna assembly further includes a first capacitor, one end of the first capacitor being coupled to the first open end, the other end of the first capacitor being coupled to the second open end.

14. An antenna assembly, characterized by Including: A floor; A first branch spaced apart from the ground plane, the first branch including a first open end and a first grounded end; A second branch spaced apart from the ground plane, the second branch including a second open end and a second grounded end, the first open end and the second open end having a first gap therebetween; A matching circuit coupled to the first open end and the second open end, the matching circuit feeding signals to the first open end and the second open end in an anti-symmetrical feeding manner, so that the antenna assembly generates a first resonance and a second resonance; The matching circuit includes a first capacitor, one end of the first capacitor being coupled to the first open end, and the other end of the first capacitor being coupled to the second open end.

15. The antenna assembly of claim 14, wherein, The antenna assembly further includes a first inductor, one end of the first inductor being coupled to the first open end, and the other end of the first inductor being coupled to the second open end.

16. The antenna assembly of claim 14 or 15, wherein, The antenna assembly further includes a first tuning device, one end of the first tuning device being coupled to the first branch, and the other end of the first tuning device being configured to be grounded, the first tuning device being used to adjust a resonance frequency of the second resonance. And / or, the antenna assembly further includes a second tuning device, one end of the second tuning device being coupled to the second branch, and the other end of the second tuning device being configured to be grounded, the second tuning device being used to adjust a resonance frequency of the first resonance.

17. The antenna assembly of any of claims 14-16, wherein, The antenna assembly further includes a second inductor and a third branch, the first grounded end being grounded through the second inductor; one end of the third branch being coupled to the first grounded end, and the other end of the third branch being an open end.

18. The antenna assembly of claim 17, wherein, The antenna assembly further includes a third inductor and a fourth branch, the second grounded end being grounded through the third inductor; one end of the fourth branch being coupled to the second grounded end, and the other end of the fourth branch being an open end.

19. The antenna assembly of claim 17 or 18, wherein, The antenna assembly further includes a third tuning device, one end of the third tuning device being coupled to the third branch, and the other end of the third tuning device being configured to be grounded, the third tuning device being used to adjust a resonance frequency of the second resonance.

20. The antenna assembly of any of claims 17-19, wherein, The antenna assembly further includes a fifth branch and a fifth tuning device, the fifth branch being disposed on a side of the third branch away from the first branch, the fifth branch having a second gap between one end of the fifth branch and the other end of the third branch; one end of the fifth tuning device being coupled to the fifth branch, and the other end of the fifth tuning device being configured to be grounded, the fifth tuning device being used to adjust a resonance frequency of the second resonance.

21. The antenna assembly of claim 20, wherein, The other end of the fifth branch is an open end or a grounded end.

22. The antenna assembly of any of claims 14-21, wherein, The antenna assembly further includes a sixth tuning device, the second branch having a current minimum point under the first resonance and the second resonance, a break being disposed at the current minimum point; the second branch on both sides of the break being coupled through the sixth tuning device.

23. An antenna assembly, characterized by Comprising: a ground plane: a first branch including a first grounded end and a second grounded end disposed opposite to each other; A second branch, the second branch being spaced apart from the first branch, the first branch having a first connection point and a second connection point spaced apart along a length of the first branch, one end of the second branch being coupled to the first connection point and another end of the second branch being coupled to the second connection point, the second branch having a first gap formed therein; a matching circuit, the matching circuit being coupled to the second branch on both sides of the first gap, the matching circuit feeding signals to the second branch on both sides of the first gap in an anti-symmetrical feeding manner, so that the antenna assembly generates a first resonance and a second resonance; the matching circuit comprising a first capacitor, the second branch on both sides of the first gap being coupled through the first capacitor.

24. The antenna assembly of claim 23, wherein, the antenna assembly further comprising a first inductor, one end of the first inductor being coupled to the second branch on one side of the first gap, and another end of the first inductor being coupled to the second branch on another side of the first gap.

25. The antenna assembly of claim 23 or 24, wherein, the antenna assembly further comprising a first tuning device, one end of the first tuning device being coupled to the second ground terminal, and another end of the first tuning device being grounded; the first tuning device being used to adjust a resonance frequency of the second resonance; and / or, the antenna assembly further comprising a second tuning device, one end of the second tuning device being coupled to the first ground terminal, and another end of the second tuning device being grounded; the second tuning device being used to adjust a resonance frequency of the first resonance.

26. The antenna assembly of any of claims 23-25, wherein, the antenna assembly further comprising a first connection branch, the first connection branch being arranged in parallel with the first branch, one end of the first connection branch being coupled to the first ground terminal, and another end of the first connection branch being an open end; and / or, the antenna assembly further comprising a second connection branch, the second connection branch being arranged in parallel with the second branch, one end of the second connection branch being coupled to the second ground terminal, and another end of the second connection branch being an open end.

27. An antenna assembly, characterized by comprising: a floor; a first branch and a second branch, the first branch and the second branch being arranged in parallel, the first branch comprising a first ground terminal and a first open end arranged oppositely, the second branch comprising a second ground terminal and a second open end arranged oppositely, the first ground terminal being arranged to face the second ground terminal; a feeding structure, the feeding structure feeding the first branch and the second branch in an anti-symmetrical feeding manner, so that the antenna assembly generates a first resonance and a second resonance; a first capacitor, one end of the first capacitor being coupled to the first ground terminal, and another end of the first capacitor being coupled to the second ground terminal.

28. The antenna assembly of claim 27, wherein, the antenna assembly further comprising a ground branch, one end of the ground branch being coupled to the first ground terminal and the second ground terminal, and another end of the ground branch being grounded.

29. The antenna assembly of claim 28, wherein, The antenna assembly further comprises a first ground branch and a second ground branch, the first ground end and the second ground end are arranged in a spaced manner, one end of the first ground branch is coupled with the first ground end, the other end of the first ground branch is grounded, one end of the second ground branch is coupled with the second ground end, the other end of the second ground branch is grounded.

30. The antenna assembly of any of claims 27-29, wherein, The feeding structure comprises a matching circuit, the matching circuit comprises a first inductor, one end of the first inductor is coupled with the first ground end, the other end of the first inductor is coupled with the second ground end.

31. The antenna assembly of any of claims 27-29, wherein, The feeding structure comprises a floating branch and a matching circuit, the floating branch is arranged in parallel and in a spaced manner with the first branch and the second branch, one end of the floating branch is coupled with the first ground end, the other end of the floating branch is coupled with the second ground branch; the floating branch is provided with a first gap, the matching circuit feeds signals to the floating branch on both sides of the first gap in the form of anti-symmetrical feeding.

32. The antenna assembly of claim 31, wherein, The antenna assembly further comprises a first tuning device, one end of the floating branch is coupled with the first ground end through the first tuning device; And / or, the antenna assembly further comprises a second tuning device, the other end of the floating branch is coupled with the second ground end through the second tuning device.

33. The antenna assembly of any of claims 27-32, wherein, The antenna assembly further comprises a first parasitic branch and a third tuning device, the first parasitic branch is arranged on a side of the first branch away from the second branch, the first parasitic branch is arranged in parallel with the first branch; the first parasitic branch and the first open end have a second gap, one end of the third tuning device is coupled with the first parasitic branch, the other end of the third tuning device is grounded; And / or, the antenna assembly further comprises a second parasitic branch and a fourth tuning device, the second parasitic branch is arranged on a side of the second branch away from the first branch, the second parasitic branch is arranged in parallel with the second branch; the second parasitic branch and the second open end have a third gap, one end of the fourth tuning device is coupled with the second parasitic branch, the other end of the fourth tuning device is grounded.

34. An electronic device, comprising: The antenna assembly comprises a radio frequency device and the antenna assembly according to any one of claims 1-33, the radio frequency device is coupled with the matching circuit.

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