Antenna device and electronic device

Abstract

The application discloses an antenna device and an electronic device, the antenna device comprising: a feed source and a first matching circuit; a first antenna comprising a first radiating branch and a second radiating branch; a feed point being arranged between a first end and a second end of the first radiating branch, the second end being provided with a first grounding point for grounding, one end of the first matching circuit being connected with the feed point and the other end being connected with the feed source, the first matching circuit being used for adjusting the matching impedance of the first radiating branch so that the first radiating branch generates a first resonant mode and a second resonant mode; the second radiating branch being used for generating a third resonant mode; the first resonant mode supporting a first frequency band, the second resonant mode supporting a second frequency band, and the third resonant mode supporting a third frequency band, the first frequency band and the second frequency band being lower than the third frequency band; the first resonant mode, the second resonant mode and the third resonant mode being respectively used for supporting signal transceiving of the first frequency band, the second frequency band and the third frequency band under excitation of the feed source.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of communication, and more particularly, to an antenna device and an electronic device. BACKGROUND

[0002] With the development of electronic technology, electronic devices (such as mobile phones, tablet computers, etc.) are applied more and more widely. In order to improve the convenience of use of electronic devices, the electronic devices can support more and more functions. This results in that the number of antennas to be set is also increasing, and the number of antennas in the electronic device increases from several to tens or even dozens.

[0003] At present, with the development of thin and light electronic devices, the internal space of the electronic device is smaller, which results in a very poor environment for the antenna and low antenna efficiency. Therefore, how to improve the radiation efficiency of the antenna becomes a problem to be solved. SUMMARY

[0004] Embodiments of the present application provide an electronic device. The antenna device and the electronic device related to the embodiments of the present application are introduced below.

[0005] In a first aspect, an antenna device is provided, comprising: a feed source and a first matching circuit; a first antenna comprising a first radiating branch and a second radiating branch; the first radiating branch comprises a first end and a second end, a feed point is arranged between the first end and the second end, the second end is provided with a first ground point, the first ground point is used for grounding, one end of the first matching circuit is connected with the feed point, the other end of the first matching circuit is connected with the feed source, the first matching circuit is used for adjusting the matching impedance of the first radiating branch, so that the first radiating branch generates a first resonant mode and a second resonant mode; the second radiating branch comprises a third end and a fourth end, the fourth end is provided with a second ground point, the second ground point is used for grounding, an electric coupling gap is formed between the first end and the third end, the second radiating branch is used for generating a third resonant mode; the first resonant mode supports a first frequency band, the second resonant mode supports a second frequency band, the third resonant mode supports a third frequency band, the first frequency band and the second frequency band are lower than the third frequency band; the first resonant mode is used for supporting the transceiving of the first frequency band signal under the excitation of the feed source, the second resonant mode is used for supporting the transceiving of the second frequency band signal under the excitation of the feed source, and the third resonant mode is used for supporting the transceiving of the third frequency band signal under the excitation of the feed source.

[0006] In a second aspect, an electronic device is provided, comprising: a reference ground plate; the antenna device as described in the first aspect, the first ground point and the second ground point in the antenna device are used for connecting with the reference ground plate.

[0007] This application provides an antenna device, including: a feed source and a first matching circuit; a first antenna, including a first radiating stub and a second radiating stub; the first radiating stub includes a first end and a second end, a feed point is disposed between the first end and the second end, and a first ground point is disposed at the second end for grounding; one end of the first matching circuit is connected to the feed point, and the other end of the first matching circuit is connected to the feed source; the first matching circuit is used to adjust the matching impedance of the first radiating stub so that the first radiating stub generates a first resonant mode and a second resonant mode; the second radiating stub includes a third... The antenna has two terminals: a first terminal and a fourth terminal. The fourth terminal has a second grounding point for grounding. An electrical coupling gap is formed between the first and third terminals. The second radiating stub is used to generate a third resonant mode. The first resonant mode supports the first frequency band, the second resonant mode supports the second frequency band, and the third resonant mode supports the third frequency band. The first and second frequency bands are lower than the third frequency band. The first resonant mode is used to support the transmission and reception of signals in the first frequency band under feed excitation, the second resonant mode is used to support the transmission and reception of signals in the second frequency band under feed excitation, and the third resonant mode is used to support the transmission and reception of signals in the third frequency band under feed excitation. By setting a first matching circuit, this scheme allows the first radiating stub to support two lower frequency bands (i.e., the first and second frequency bands, and the first and second frequency bands are lower than the third frequency band), thereby enabling the first antenna to support more frequency bands. Furthermore, it can reduce the number of antennas required in electronic devices and the degree of interference to antenna performance, thus helping to reduce costs and improve antenna radiation efficiency. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the antenna device provided in one embodiment of this application.

[0009] Figure 2 for Figure 1 The diagram shows another possible structural schematic of the antenna device.

[0010] Figure 3 for Figure 2 The diagram shows another possible structural schematic of the antenna device.

[0011] Figure 4 for Figure 1 The diagram shows another possible structural schematic of the antenna device.

[0012] Figure 5 for Figure 2 The diagram shows another possible structural schematic of the antenna device.

[0013] Figure 6 for Figure 5 The diagram shows another possible structural schematic of the antenna device.

[0014] Figure 7 is a schematic diagram of an S parameter curve of the first antenna without the first matching circuit.

[0015] Figure 8 is a schematic diagram of an S parameter curve of the first antenna with the first matching circuit.

[0016] Figure 9 is a schematic diagram of an S parameter curve of the first antenna before and after the first tuning circuit is added according to an embodiment of the present application.

[0017] Figure 10 is a schematic diagram of an efficiency curve of the first antenna without the first tuning circuit according to an embodiment of the present application.

[0018] Figure 11 is a schematic diagram of an efficiency curve of the first antenna with the first tuning circuit according to an embodiment of the present application.

[0019] Figure 12 is a schematic diagram of a comparison of system radiation efficiency of the second radiation branch before and after the first matching circuit is added.

[0020] Figure 13 is a schematic diagram of an electronic device according to an embodiment of the present application.

[0021] Figure 14 is Figure 13 is another possible schematic diagram of an electronic device. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely 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, but not all the embodiments of the present application.

[0023] With the development of electronic technology, electronic devices (such as mobile phones, tablet computers, etc.) are applied more and more widely. In order to improve the convenience of use of electronic devices, electronic devices can support more and more functions. This results in an increasing number of antennas that need to be set. The number of antennas in an electronic device has increased from several to tens or even dozens, resulting in a higher cost of electronic devices.

[0024] At present, with the development of thin and light electronic devices, the internal space of electronic devices is smaller, which results in a very poor environment for antennas and low antenna efficiency. Therefore, how to improve the radiation efficiency of antennas and reduce the cost of electronic devices has become a problem to be solved.

[0025] To address the aforementioned problems, this application provides an antenna device, comprising: a feed source and a first matching circuit; a first antenna, including a first radiating stub and a second radiating stub; the first radiating stub includes a first end and a second end, a feed point is disposed between the first end and the second end, and a first ground point is disposed at the second end for grounding; one end of the first matching circuit is connected to the feed point, and the other end of the first matching circuit is connected to the feed source; the first matching circuit is used to adjust the matching impedance of the first radiating stub to enable the first radiating stub to generate a first resonant mode and a second resonant mode; the second radiating stub... The segment includes a third terminal and a fourth terminal. The fourth terminal is provided with a second grounding point for grounding. An electrical coupling gap is formed between the first and third terminals. The second radiating stub is used to generate a third resonant mode. The first resonant mode supports a first frequency band, the second resonant mode supports a second frequency band, and the third resonant mode supports a third frequency band. The first and second frequency bands are lower than the third frequency band. The first resonant mode is used to support the transmission and reception of signals in the first frequency band under feed excitation, the second resonant mode is used to support the transmission and reception of signals in the second frequency band under feed excitation, and the third resonant mode is used to support the transmission and reception of signals in the third frequency band under feed excitation. By setting a first matching circuit, this scheme allows the first radiating stub to support two lower frequency bands (i.e., the first and second frequency bands, and the first and second frequency bands are lower than the third frequency band), thereby enabling the first antenna to support more frequency bands. Furthermore, it can reduce the number of antennas required in electronic devices and the degree of interference to antenna performance, thus helping to reduce costs and improve antenna radiation efficiency.

[0026] The following text combines Figure 1 The antenna device provided in the embodiments of this application will be described in detail. For example... Figure 1 As shown, the antenna device 100 includes a feed 110, a first matching circuit 120, and a first antenna 130.

[0027] The feed source 110 can include, but is not limited to, a radio frequency transceiver chip and a radio frequency front-end circuit in an electronic device. The first antenna 130 includes a first radiating branch 140 and a second radiating branch 150; the first radiating branch 140 includes a first end 141 and a second end 142, a feed point 144 is arranged between the first end 141 and the second end 142, the second end 142 is provided with a first grounding point 143 for grounding, one end of the first matching circuit 120 is connected with the feed point 144, the other end of the first matching circuit 120 is connected with the feed source 110, and the first matching circuit 120 is used to adjust the matching impedance of the first radiating branch 140, so that the first radiating branch 140 generates a first resonant mode and a second resonant mode; the second radiating branch 150 includes a third end 151 and a fourth end 152, the fourth end 152 is provided with a second grounding point 153 for grounding, and an electrically coupled gap 131 is formed between the first end 141 and the third end 151, and the second radiating branch 150 is used to generate a third resonant mode; the first resonant mode can support a first frequency band, the second resonant mode can support a second frequency band, and the third resonant mode can support a third frequency band; the first frequency band and the second frequency band are lower than the third frequency band; the first resonant mode is used to support the transceiving of the first frequency band signal under the excitation of the feed source 110, the second resonant mode is used to support the transceiving of the second frequency band signal under the excitation of the feed source 110, and the third resonant mode is used to support the transceiving of the third frequency band signal under the excitation of the feed source 110. The first antenna 130 can support more frequency bands through the first matching circuit 120, so that the number of antennas in the electronic device and the degree of interference on the performance of the antennas can be reduced, thereby helping to reduce the cost and improve the radiation efficiency of the antennas.

[0028] It can be understood that the first frequency band and the second frequency band being lower than the third frequency band can mean that all frequencies in the first frequency band are lower than the frequencies (for example, the lowest frequency) in the third frequency band, and all frequencies in the second frequency band are lower than the frequencies (for example, the lowest frequency) in the third frequency band. Of course, the first frequency band and the second frequency band being lower than the third frequency band can mean that the center frequency of the first frequency band is lower than the center frequency of the third frequency band, and the center frequency of the second frequency band is lower than the center frequency of the third frequency band, which is not limited in the present application.

[0029] In some embodiments, the first frequency band and the second frequency band can be low frequency bands. As an example, the first frequency band can be a B28 frequency band, the second frequency band can be a B8 frequency band, and the third frequency band can be a Wi-Fi 2.4G frequency band.

[0030] In some embodiments, the first grounding point 143 can be grounded through a metal wire, a metal column or a metal spring, the second grounding point 153 can be grounded through a metal wire, a metal column or a metal spring, which is not limited in the present application.

[0031] To deepen the understanding of the antenna device 100 in the embodiments of this application, the following is combined with... Figure 2 A detailed example of the first matching circuit 120 is provided.

[0032] Figure 2 for Figure 1 Another possible structural schematic diagram of the antenna device 100 shown is illustrated below. Figure 2 As shown, the first matching circuit 120 includes a first capacitor C1 and a first inductor L1. One end of the first capacitor C1 is connected to the feed source, and the other end of the first capacitor C1 is connected to the feed point. One end of the first inductor L1 is connected to the feed source, and the other end of the first inductor L1 is used for grounding.

[0033] It should be noted that before the first matching circuit 120 is set, the first radiating stub 140 can typically only form a single wave in the low-frequency band. After setting the first matching circuit 120, the first radiating stub 140 can form two waves in the low-frequency band (i.e., the first radiating stub 140 can generate a first resonant mode and a second resonant mode). More specifically, in the first matching circuit 120, by setting the first capacitor C1 and the first inductor L1, the first radiating stub 140 can generate two resonant modes (i.e., form two waves).

[0034] In some embodiments, see Figure 3 The first matching circuit further includes: a second capacitor C2, a second capacitor C3, a second inductor L2, and a third inductor L3; one end of the second capacitor C2 is connected to the feed source, and the other end of the second capacitor C2 is used for grounding; one end of the second capacitor C3 is connected to the feed source, and the other end of the second capacitor C3 is connected to one end of the first capacitor C1; one end of the first inductor L1 is connected to the other end of the second capacitor C3, and the other end of the first inductor L1 is used for grounding; the other end of the first capacitor C1 is connected to one end of the third inductor L3; one end of the second inductor L2 is connected to the other end of the first capacitor C1, and the other end of the second inductor L2 is used for grounding; and the other end of the third inductor L3 is connected to the feed point. It should be understood that the capacitance values ​​of the capacitors and the inductance values ​​of the inductors can be set according to requirements, and this application does not impose specific limitations in this regard.

[0035] It should be noted that by setting the second capacitor C2, the second capacitor C3, the second inductor L2, and the third inductor L3, the waveform of the dual waves can be adjusted to obtain a suitable waveform.

[0036] In some embodiments, see Figure 4, the antenna device 100 further comprises a first tuning circuit 160. The second radiating branch 150 further comprises a third grounding point 154, which is disposed between the third end 151 and the fourth end 152, and can be used to connect with the first tuning circuit 160 and ground. The first tuning circuit 160 is used to adjust the third resonant mode, so as to improve the effective frequency band bandwidth corresponding to the third resonant mode, thereby improving the efficiency of the second radiating branch 150. In some embodiments, the position of the third grounding point 154 can be set close to the fourth end 152 of the second radiating branch 150. When the third grounding point 154 is close to the fourth end 152, the first tuning circuit 160 can achieve greater tuning of the effective frequency band bandwidth of the second radiating branch 150.

[0037] In some embodiments, referring to Figure 5 , the first tuning circuit 160 comprises a fourth inductor L4. One end of the fourth inductor L4 is connected with the third grounding point 154, and the other end of the fourth inductor L4 is used for grounding. The fourth inductor L4 can be used to adjust the third resonant mode, so as to improve the effective frequency band bandwidth corresponding to the third resonant mode, thereby improving the efficiency of the second radiating branch 150. The inductance value of the fourth inductor L4 can be set according to requirements, which is not limited in the present application.

[0038] In some embodiments, referring back to Figure 4 , the currents on the first radiating branch 140 and the second radiating branch 150 are in the same direction. The current direction on the first radiating branch 140 can be from the second end 142 to the first end 141, and the current direction on the second radiating branch 150 can be from the third end 151 to the fourth end 152.

[0039] In some embodiments, under the action of the first matching circuit 120, the first radiating branch 140 can generate a first resonant mode and a second resonant mode. The current corresponding to the first resonant mode is from the first grounding point 143 to the first end 141, and the current corresponding to the second resonant mode is from the feeding point 144 to the first end 141. In some embodiments, the first radiating branch 140 is a inverted-F antenna, and can also be an inverted-L antenna. When the first radiating branch 140 is an inverted-L antenna, referring to Figure 6 , a second matching circuit 170 can be provided in the antenna device 100. The first grounding point 143 is connected with the second matching circuit 170 and grounded. The second matching circuit 170 can be used to adjust the matching impedance of the second radiating branch 150. In some embodiments, the second matching circuit 170 can comprise a fifth inductor L5. One end of the fifth inductor L5 is connected with the first grounding point 143, and the other end of the fifth inductor L5 is used for grounding. The inductance value of the fifth inductor L5 can be set according to requirements, which is not limited in the present application.

[0040] It should be noted that when the first radiating branch 140 is an inverted F antenna, the first grounding point 143 can be grounded through a metal wire, a metal column or a metal sheet, and the equivalent circuit of the metal wire, the metal column or the metal sheet is an inductor. That is, "the first radiating branch 140 is an inverted F antenna, and the first grounding point 143 is grounded through a metal wire, a metal column or a metal sheet" is equivalent to "the first radiating branch 140 is an inverted L antenna, and the first grounding point 143 is grounded through the fifth inductor L5".

[0041] In some embodiments, the radiator of the first radiating branch 140 and the radiator of the second radiating branch 150 can be the same or different. For example, the radiator of the first radiating branch 140 can be a metal frame with good electrical conductivity, or can be a flexible printed circuit (FPC) or a laser direct structuring (LDS). The radiator of the second radiating branch 150 can be a metal frame, an FPC or an LDS.

[0042] In some embodiments, when the radiator of the first radiating branch 140 and the radiator of the second radiating branch 150 are metal frames, the first radiating branch 140 and the second radiating branch 150 are formed by slitting the metal frames.

[0043] In order to verify the resonance modes generated by the first radiating branch 140 before and after adding the first matching circuit 120, the following examples are given. Figure 7 and Figure 8 are given.

[0044] Figure 7 is a schematic diagram of the S parameter curve of the first antenna 130 without the first matching circuit 120. Referring to Figure 7 , the first radiating branch 140 can generate two resonance modes. One resonance mode corresponds to a resonance frequency point, which is resonance point 3, and the resonance point 3 is a resonance point generated by 1 / 4 wavelength of the frequency band corresponding to the resonance mode of the first radiating branch 140. The other resonance mode corresponds to a resonance frequency point, which is resonance point 2, and the resonance point 2 is a resonance point generated by 3 / 4 wavelength of the frequency band corresponding to the resonance mode of the first radiating branch 140. It can be seen that the resonance point 2 is (2.5911, -6.7093), the resonance point 3 is (0.836, -3.6149), and the frequency of the resonance point 2 is about 3 times the frequency of the resonance point 3. Further, it can be seen that the frequency bands of the two resonance modes generated by the first radiating branch 140 are relatively far apart. The second radiating branch 150 can generate one resonance mode, and the resonance frequency point of the resonance mode is resonance point 1, which is (2.428, -18.328).

[0045] Figure 8 is a schematic diagram of S parameter curve of the first antenna 130 with the first matching circuit 120 added. Referring to Figure 8 , the first radiating branch 140 can generate three resonance modes, the first radiating branch 140 can generate two resonance modes (which can be referred to as a first resonance mode and a second resonance mode) in a low frequency band, a resonance point of the first resonance mode is resonance point 1, a resonance point of the second resonance mode is resonance point 2, the resonance point 1 is a resonance point generated by 1 / 4 wavelength of a frequency band corresponding to the first resonance mode, and the resonance point 2 is a resonance point generated by 1 / 4 wavelength of a frequency band corresponding to the second resonance mode; the first radiating branch 140 can also generate one resonance mode in a high frequency band, a resonance point of the resonance mode is resonance point 4, and the resonance point 4 is a resonance point generated by 3 / 4 wavelength of a frequency band corresponding to the second resonance mode. It can be seen that the resonance point 1 is (0.763, -7.7259), the resonance point 2 is (0.93565, -7.064), and the resonance point 4 is (2.902, -3.2318). Further, it can be seen that the first radiating branch 140 generates double waves in the low frequency band, and the frequency bands of the two resonance modes in the low frequency band are close. The second radiating branch 150 can generate one resonance mode, a resonance frequency point of the resonance mode is resonance point 3, and the resonance point 3 is (2.4449, -22.249).

[0046] To verify the change of the frequency band corresponding to the third resonance mode before and after the first tuning circuit 160 is added, the following will be illustrated by taking Figure 9 as an example.

[0047] Figure 9 is a schematic diagram of S parameter curve of the first antenna 130 before and after the first tuning circuit 160 is added. As shown in Figure 9 , the first tuning circuit 160 has little effect on the effective bandwidth of the frequency bands corresponding to the first resonance mode and the second resonance mode. When the return loss is less than -5 dB, the bandwidth of the frequency band corresponding to the third resonance mode is significantly increased in the case that the first tuning circuit 160 is added. It should be noted that, generally, the frequency band corresponding to the return loss less than -5 dB is the effective bandwidth.

[0048] To verify the change of the radiation efficiency of the first antenna 130 before and after the first tuning circuit 160 is added, the following will be illustrated by taking Figures 10 to 12 as an example.

[0049] Figure 10is a schematic diagram of the efficiency curve of the first antenna 130 without the first tuning circuit 160 provided by the embodiment of the present application. By adding the first matching circuit 120, the first radiating branch 140 can generate two resonance modes (i.e., a first resonance mode and a second resonance mode) in the low frequency band. As shown in Figure 10 , the maximum system total efficiency value of the first radiating branch 140 in the first resonance mode (i.e., corresponding to the B28 frequency band) is about -9.8 dB, the maximum system total efficiency value of the first radiating branch 140 in the second resonance mode (i.e., corresponding to the B8 frequency band) is about -9.2 dB, and the maximum system total efficiency value of the second radiating branch 150 in the third resonance mode (i.e., corresponding to the Wi-Fi 2.4G frequency band) is about -5.7 dB.

[0050] Figure 11 is a schematic diagram of the efficiency curve of the first antenna 130 with the first tuning circuit 160 provided by the embodiment of the present application. As shown in Figure 11 , the maximum system total efficiency value of the first radiating branch 140 in the first resonance mode (i.e., corresponding to the B28 frequency band) is about -11.3 dB, the maximum system total efficiency value of the first radiating branch 140 in the second resonance mode (i.e., corresponding to the B8 frequency band) is about -8.9 dB, and the maximum system total efficiency value of the second radiating branch 150 in the third resonance mode (i.e., corresponding to the Wi-Fi 2.4G frequency band) is about -5.8 dB.

[0051] According to Figure 10 and Figure 11 , it can be seen that the maximum system total efficiency of the second radiating branch 150 is slightly enhanced after adding the first tuning circuit 160. In order to understand the influence of the first tuning circuit 160 on the radiation efficiency of the second radiating branch 150 in more detail, the following will be illustrated by taking Figure 12 as an example.

[0052] Figure 12 is a schematic diagram of the system radiation efficiency of the second radiating branch 150 before and after adding the first matching circuit 120. As shown in Figure 12As shown, before the first matching circuit 120 is added, the maximum system radiation efficiency of the second radiation branch 150 is about -5.5 dB, and the beam bandwidth of 0.3 dB reduction in the maximum system radiation efficiency is (2.5102-2.4417) GHz, i.e., about 68 MHz. After the first matching circuit 120 is added, the maximum system radiation efficiency of the second radiation branch 150 is about -5.4 dB, and the beam bandwidth of 0.3 dB reduction in the maximum system radiation efficiency is (2.5766-2.488) GHz, i.e., about 88 MHz. That is, the 0.3 dB beam width can increase the bandwidth from 68 MHz to 88 MHz, and the bandwidth is obviously widened. In addition, although the maximum system radiation efficiency of the second radiation branch 150 is slightly improved before and after the first matching circuit 120 is added, in the bandwidth of 2.5 GHz-2.7 GHz, the system radiation efficiency of the second radiation branch 150 is significantly improved after the first matching circuit 120 is added.

[0053] According to the above, the scheme achieves a double-low-frequency resonance mode on the first radiation branch 140 by setting the first matching circuit 120, so that the first antenna 130 can work in multiple modes and multiple frequency bands at the same time (for example, Wi-Fi 2.4G, B28, and B8 frequency bands can work at the same time). Further, by setting the first tuning circuit 160, the effective working bandwidth of the second radiation branch 150 can be increased, and the working efficiency of the second radiation branch 150 can be improved.

[0054] Referring to Figure 13 The embodiments of the present application also provide an electronic device 1300, which can include a reference ground plate 1310 and an antenna device 100 as described above. The first grounding point 143 and the second grounding point 153 in the antenna device 100 can be used to connect with the reference ground plate 1310.

[0055] In some embodiments, referring to Figure 14 The electronic device 1300 can also include a metal frame 1320, and the first radiation branch 140 and the second radiation branch 150 can be formed by slitting the frame 1320.

[0056] In some embodiments, the first radiation branch 140 has a gap with the reference ground plate 1310, and the second radiation branch 150 has a gap with the reference ground plate 1310.

[0057] In some embodiments, the first antenna 130 in the antenna device can be located on the left side of the metal frame 1320.

[0058] In some embodiments, the first radiation branch 140 is parallel to the reference ground plate 1310, and the second radiation branch 150 is parallel to the reference ground plate 1310.

[0059] In some embodiments, the reference ground plate 1310 can provide a grounding function for the antenna device 100 to ensure stability and safety of the first antenna 130. In some embodiments, the reference ground plate 1310 can be a metal ground plate or an artificial magnetic conductor (AMC). The out-of-phase reflection capability of the AMC structure can reduce the profile height of the antenna, so that the far-field electric field can be superimposed in phase in a limited space, thereby further improving the efficiency of the first antenna 130.

[0060] The electronic device 1300 in the embodiments of the present application can be any type of electronic device with wireless communication function. The electronic device can be a portable mobile terminal, and can also be a handheld mobile terminal. For example, the electronic device can be a mobile phone, a tablet computer (Pad), a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, etc., which are not limited in the present application.

[0061] It should be understood that, in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that the determination of B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0062] It should be understood that the term "and / or" in the present application is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after it.

[0063] It should be understood that, in various embodiments of the present application, the size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0064] In several embodiments provided in the present application, it should be understood that the disclosed system and device can be implemented in other manners. For example, the embodiments of the device described above are merely schematic; the division of the units is only a logical function division; there can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0065] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0066] In addition, each functional unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0067] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium readable by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as digital video disc (DVD)) or semiconductor media (such as solid state disk (SSD)) and the like.

[0068] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An antenna device, characterized by The antenna device comprises: a feed source and a first matching circuit; a first antenna comprising a first radiating branch and a second radiating branch; the first radiating branch comprises a first end and a second end, a feed point is arranged between the first end and the second end, the second end is provided with a first grounding point, the first grounding point is used for grounding, one end of the first matching circuit is connected with the feed point, the other end of the first matching circuit is connected with the feed source, and the first matching circuit is used for adjusting the matching impedance of the first radiating branch, so that the first radiating branch generates a first resonant mode and a second resonant mode; the second radiating branch comprises a third end and a fourth end, the fourth end is provided with a second grounding point, the second grounding point is used for grounding, and a capacitive coupling gap is formed between the first end and the third end, and the second radiating branch is used for generating a third resonant mode under the action of the capacitive coupling; the first resonant mode supports a first frequency band, the second resonant mode supports a second frequency band, and the third resonant mode supports a third frequency band, and the first frequency band and the second frequency band are lower than the third frequency band; the first resonant mode is used for supporting the transceiving of the first frequency band signal under the excitation of the feed source, the second resonant mode is used for supporting the transceiving of the second frequency band signal under the excitation of the feed source, and the third resonant mode is used for supporting the transceiving of the third frequency band signal under the excitation of the feed source.

2. The antenna device of claim 1, wherein The first matching circuit comprises: a first capacitor and a first inductor; one end of the first capacitor is connected with the feed source, the other end of the first capacitor is connected with the feed point, one end of the first inductor is connected with the feed source, and the other end of the first inductor is used for grounding.

3. The antenna device of claim 2, wherein, The first matching circuit further comprises: a second capacitor, a third capacitor, a second inductor and a third inductor; one end of the second capacitor is connected with the feed source, the other end of the second capacitor is used for grounding, one end of the third capacitor is connected with the feed source, the other end of the third capacitor is connected with one end of the first capacitor, one end of the first inductor is connected with the other end of the third capacitor, the other end of the first inductor is used for grounding, the other end of the first capacitor is connected with one end of the third inductor, one end of the second inductor is connected with the other end of the first capacitor, the other end of the second inductor is used for grounding, and the other end of the third inductor is connected with the feed point.

4. The antenna device of claim 1, wherein The antenna device further comprises: a first tuning circuit; the second radiating branch further comprises a third grounding point arranged between the third end and the fourth end, the third grounding point is used for being connected with the first tuning circuit and grounding, and the first tuning circuit is used for adjusting the third resonant mode.

5. The antenna device of claim 4, wherein, The first tuning circuit comprises: a fourth inductor; one end of the fourth inductor is connected with the third grounding point, the other end of the fourth inductor is used for grounding, and the fourth inductor is used for adjusting the third resonant mode.

6. The antenna device of claim 1, wherein, The currents on the first radiating branch and the second radiating branch are the same direction currents.

7. The antenna device of claim 6, wherein, The current direction on the first radiating branch is from the second end to the first end, and the current direction on the second radiating branch is from the third end to the fourth end.

8. The antenna device of claim 7, wherein, The current corresponding to the first resonant mode is from the first grounding point to the first end, and the current corresponding to the second resonant mode is from the feed point to the first end.

9. The antenna device according to any of claims 1-8, characterized by The first radiating branch is an inverted L antenna, and the antenna device further comprises: a second matching circuit; The first grounding point is connected with the second matching circuit and grounded, and the second matching circuit is used for adjusting the matching impedance of the second radiating branch.

10. The antenna device of claim 9, wherein, The second matching circuit comprises: a fifth inductor; One end of the fifth inductor is connected with the first grounding point, and the other end of the fifth inductor is used for grounding.

11. The antenna device according to any of claims 1-8, characterized by The first radiating branch is an inverted F antenna.

12. The antenna device according to any of claims 1-8, characterized by The radiators of the first radiating branch and the second radiating branch are metal frames, FPCs or LDSs.

13. The antenna device of claim 12, wherein, The radiators of the first radiating branch and the second radiating branch are metal frames, and the first radiating branch and the second radiating branch are formed by slitting the metal frames.

14. The antenna device according to any of claims 1-8, characterized by The first frequency band is a B28 frequency band, the second frequency band is a B8 frequency band, and the third frequency band is a Wi-Fi 2.4G frequency band.

15. An electronic device, comprising: comprises: a reference floor; The antenna device according to any one of claims 1-14, wherein the first grounding point and the second grounding point in the antenna device are used to be connected with the reference floor.

16. The electronic device of claim 15, wherein, The first radiating branch in the antenna device has a gap with the reference floor, and the second radiating branch in the antenna device has a gap with the reference floor.

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