Antenna device and electronic equipment

Abstract

The embodiment of the invention provides an antenna device and electronic equipment, and the antenna device comprises a second radiator which comprises a second feeding point, and the second feeding point is used for feeding a second excitation signal; the third radiator and the second radiator are arranged at an interval, the third radiator and the second radiator are electromagnetically coupled, and the third radiator is suspended; the third radiator and the second radiator are used for transmitting a second excitation signal together, and when the second excitation signal is transmitted together, the current strong point is located on the second radiator. In the antenna device, the third radiator is suspended, and no return path exists at the third radiator, so that no current strong point exists at the third radiator, SAR hot spots of the third radiator can be reduced, the overall SAR value of the antenna device can be reduced, power rollback caused by the fact that the SAR value exceeds the standard can be reduced, and even power rollback is not needed. Therefore, the communication performance of the electronic equipment can be improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an antenna device and an electronic device. Background Art

[0002] When electronic devices such as smartphones and tablets are communicating wirelessly, the human body will absorb some of the electromagnetic wave energy. In order to protect human health and safety, electronic devices need to meet the SAR (Specific Absorption Rate) compliance requirements of the region in which they are located. When the SAR value of an electronic device exceeds the regional regulatory standard, measures need to be taken to reduce the SAR value. Currently, the most common mechanism to reduce the SAR value is the power back-off mechanism, which is to reduce the antenna's transmit power so that the SAR value of the electronic device meets the regulatory standards.

[0003] However, when the transmission power of the antenna is reduced, the communication performance of the electronic device will be reduced. Summary of the invention

[0004] The embodiments of the present application provide an antenna device and an electronic device, which can reduce the SAR value of the antenna device, thereby reducing power back-off and improving communication performance.

[0005] An embodiment of the present application provides an antenna device, including:

[0006] A second radiator, comprising a second feeding point, wherein the second feeding point is used to feed a second excitation signal;

[0007] a third radiator, spaced apart from the second radiator and electromagnetically coupled to the second radiator, the third radiator being suspended;

[0008] The third radiator and the second radiator are used to jointly transmit the second excitation signal. When the second excitation signal is jointly transmitted, the current intensity point is located at the second radiator.

[0009] An embodiment of the present application further provides an electronic device, comprising the above-mentioned antenna device.

[0010] In the antenna device provided in the embodiment of the present application, the second radiator and the third radiator can jointly radiate the wireless signal corresponding to the second excitation signal, and the third radiator is suspended in the air, and there is no return path to the ground at the third radiator, so there is no strong current point at the third radiator, thereby reducing the SAR hotspot of the third radiator and reducing the overall SAR value of the antenna device. Therefore, when the user actually uses the electronic device, since the overall SAR value is reduced, the power backoff caused by the SAR value exceeding the standard can be reduced, and even no power backoff is required, thereby improving the communication performance of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0012] Figure 1 A first structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0013] Figure 2 A first structural schematic diagram of an antenna device provided in an embodiment of the present application.

[0014] Figure 3 A second structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0015] Figure 4 for Figure 2 An example of a structure of the antenna device shown.

[0016] Figure 5 for Figure 4 A first current transmission schematic diagram of the antenna device is shown.

[0017] Figure 6 for Figure 4 A second current transmission schematic diagram of the antenna device shown.

[0018] Figure 7 A third structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0019] Figure 8 A fourth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0020] Fig. 9 A fifth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0021] Fig.10 for Figure 8 An example of a structure of the antenna device shown.

[0022] Fig.11 A sixth structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0023] Fig.12 for Fig.11 A first current transmission schematic diagram of the antenna device is shown.

[0024] Fig.13 for Fig.11 A second current transmission schematic diagram of the antenna device shown.

[0025] Fig.14 This is a seventh structural schematic diagram of the antenna device provided in an embodiment of the present application.

[0026] Fig.15 A second structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0027] Fig.16 A schematic diagram of the structure of a metal frame of an electronic device provided in an embodiment of the present application.

[0028] Fig.17 This is a schematic diagram of S11 simulation of the antenna device provided in an embodiment of the present application transmitting a low-frequency signal.

[0029] Fig.18 This is a schematic diagram of S11 simulation of the antenna device provided in an embodiment of the present application transmitting medium and high frequency signals.

[0030] Fig.19 A schematic diagram of current distribution when the antenna device provided in an embodiment of the present application radiates wireless signals in the B3 frequency band.

[0031] Fig. 20 A schematic diagram of current distribution when the antenna device provided in an embodiment of the present application radiates wireless signals in the B1 frequency band.

[0032] Fig.21 A schematic diagram of SAR hotspots of the antenna device provided in an embodiment of the present application at the B3 frequency band.

[0033] Fig. 22 A schematic diagram of SAR hotspots of the antenna device provided in an embodiment of the present application at the B1 frequency band. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] The present application provides an electronic device, which may be a smart phone, a tablet computer, or a gaming device, an AR (Augmented Reality) device, a data storage device, an audio player, a video player, a laptop, a desktop computing device, or the like.

[0036] refer to Figure 1 , Figure 1The first structural diagram of the electronic device 100 provided in the embodiment of the present application is as follows. The electronic device 100 includes a housing 10 and an antenna device 20 .

[0037] The housing 10 is used to form the outer contour of the electronic device 100, so as to accommodate the electronic devices and functional components of the electronic device 100, and to seal and protect the electronic devices and functional components inside the electronic device. For example, the camera, circuit board, display screen and other functional components of the electronic device 100 can be arranged in the housing 10.

[0038] The antenna device 20 can be used to implement the wireless communication function of the electronic device 100, for example, the antenna device 20 can be used to implement LTE (Long Term Evolution) communication, 5G (5th Generation Mobile Communication Technology) communication and other functions. Among them, the antenna device 20 is arranged in the shell 10. It can be understood that some components of the antenna device 20 can be integrated inside the shell 10, for example, the signal processing chip and the signal processing circuit can be integrated on the circuit board inside the shell 10. In addition, some components of the antenna device 20 can also be directly arranged inside the shell 10 or on the shell 10, for example, the radiator for radiating the signal can be arranged inside the shell 10 or on the shell 10.

[0039] refer to Figure 2 , Figure 2 The first structural diagram of the antenna device 20 provided in the embodiment of the present application is as follows. The antenna device 20 includes a first radiator 21 , a second radiator 22 , a third radiator 23 , a first tuning switch 24 , a first feed source 25 and a second feed source 26 .

[0040] The first radiator 21, the second radiator 22, and the third radiator 23 can all be used to radiate wireless signals. Among them, the first radiator 21, the second radiator 22, and the third radiator 23 can all be radiators in the form of FPC (Flexible Printed Circuit), LDS (Laser Direct Structure), PDS (Printing Direct Structure), etc., or they can be radiators formed by structures such as conductor structures inside the electronic device 100 and metal traces on a circuit board. In practical applications, the first radiator 21, the second radiator 22, and the third radiator 23 can be radiators of different forms or radiators of the same form. The shape, size, etc. of the first radiator 21, the second radiator 22, and the third radiator 23 can be set according to actual needs.

[0041] The first radiator 21 includes a first feeding point 21a and a first tuning point 21b. The first feeding point 21a is spaced apart from the first tuning point 21b. The first feeding point 21a is used to feed a first excitation signal. The first excitation signal is used to excite the first radiator 21 to resonate and radiate a wireless signal corresponding to the first excitation signal to the outside. In practical applications, the first excitation signal may be a cellular excitation signal, such as an LTE, 5G or other excitation signal. In an application example, the first excitation signal is a low-frequency signal, and the frequency range of the low-frequency signal includes 698MHz to 960MHz.

[0042] In some embodiments, the first radiator 21 includes a first radiating section 211 and a second radiating section 212. The first feeding point 21a is located in the first radiating section 211, and the first tuning point 21b is located in the second radiating section 212. The second radiating section 212 is connected to the first radiating section 211 and is perpendicular to each other. The first radiating section 211 includes a first free end 21c that is away from the second radiating section 212, and the second radiating section 212 includes a second free end 21d that is away from the first radiating section 211.

[0043] The second radiator 22 is spaced from the first radiator 21. The second radiator 22 includes a second feeding point 22a. The second feeding point 22a is used to feed the second excitation signal. In practical applications, the second excitation signal may be a cellular excitation signal, such as an excitation signal of LTE, 5G, etc. In an application example, the second excitation signal is a medium-high frequency signal, and the frequency range of the medium-high frequency signal includes 1710MHz to 3800MHz.

[0044] The third radiator 23 is spaced apart from the first radiator 21 and the second radiator 22. The third radiator 23 is located between the first radiator 21 and the second radiator 22. The third radiator 23 is suspended. It can be understood that the third radiator 23 is suspended, which means that the third radiator 23 is neither grounded nor connected to the first feed source 25 or the second feed source 26.

[0045] Among them, the third radiator 23 is electromagnetically coupled with the second radiator 22. Therefore, energy can be transferred between the third radiator 23 and the second radiator 22 through electromagnetic coupling. When the second excitation signal is fed to the second radiator 22 through the second feeding point 22a, the third radiator 23 and the second radiator 22 can jointly transmit the second excitation signal, generate resonance corresponding to the second excitation signal, and radiate a wireless signal corresponding to the second excitation signal to the outside. Since the third radiator 23 is suspended, there is no return path at the third radiator 23. When the third radiator 23 and the second radiator 22 jointly transmit the second excitation signal, the current strong point is located at the second radiator 22, and there is no current strong point at the third radiator 23.

[0046] The first tuning switch 24 can be represented as SW1. The first tuning switch 24 is electrically connected to the first tuning point 21b, and the first tuning switch 24 is grounded. The first tuning switch 24 is used to switch the frequency band of the wireless signal radiated by the first radiator 21 when transmitting the first excitation signal. Therefore, the first radiator 21 can radiate wireless signals of multiple frequency bands, thereby expanding the bandwidth of the antenna device 20.

[0047] The first feed source 25 is electrically connected to the first feeding point 21 a and is used to provide a first excitation signal and feed the first excitation signal to the first radiator 21 through the first feeding point 21 a.

[0048] The second feed source 26 is electrically connected to the second feeding point 22a. The second feed source 26 is used to provide a second excitation signal and feed the second excitation signal to the second radiator 22 through the second feeding point 22a.

[0049] The first feed source 25 and the second feed source 26 may both be disposed on a circuit board of the electronic device 100 .

[0050] In actual applications, in the scenario where the user uses the electronic device 100 for wireless communication, since the dielectric constant of human tissue is much greater than the dielectric constant of air, according to Maxwell's equations, the normal component of the electric field in human tissue is much smaller than the normal component of the electric field in air, the tangential component of the electric field in human tissue is equal to the tangential component of the electric field in air, and the magnetic field in human tissue is equal to the magnetic field in air. Therefore, the electric field is not easy to penetrate the human body, while the magnetic field can freely penetrate the human body. It can be seen from this that SAR hotspots correspond to points with strong magnetic fields, and magnetic fields are generated by electric currents, so SAR hotspots correspond to points with strong currents.

[0051] In the antenna device 20 provided in the embodiment of the present application, the first radiator 21 can radiate the wireless signal corresponding to the first excitation signal, the second radiator 22 and the third radiator 23 can jointly radiate the wireless signal corresponding to the second excitation signal, and the third radiator 23 is suspended, and there is no return path to the ground at the third radiator 23, so there is no strong current point at the third radiator 23, thereby reducing the SAR hotspot of the third radiator 23 and reducing the overall SAR value of the antenna device 20. Therefore, when the user actually uses the electronic device 100, since the overall SAR value is reduced, the power backoff caused by the SAR value exceeding the standard can be reduced, and even no power backoff is required, thereby improving the communication performance of the electronic device 100.

[0052] In some embodiments, reference Figure 3 , Figure 3 A second structural schematic diagram of the antenna device 20 provided in an embodiment of the present application. Figure 3 The antenna device 20 is shown with Figure 2The difference of the antenna device 20 shown is that the antenna device 20 includes a second radiator 22, a third radiator 23 and a second feed source 26, but may not include a first radiator 21, a first tuning switch 24 and a first feed source 25. The specific implementation of the second radiator 22, the third radiator 23 and the second feed source 26 can refer to the description in the above embodiment, which will not be repeated here.

[0053] In the embodiment of the present application, the third radiator 23 and the second radiator 22 of the antenna device 20 can jointly transmit the second excitation signal, generate resonance corresponding to the second excitation signal, and radiate the wireless signal corresponding to the second excitation signal to the outside. Similarly, since the third radiator 23 is suspended, there is no return path to the ground at the third radiator 23. When the third radiator 23 and the second radiator 22 jointly transmit the second excitation signal, the current strong point is located at the second radiator 22, and there is no current strong point at the third radiator 23. Therefore, the SAR hotspot of the third radiator 23 can be reduced, thereby reducing the overall SAR value of the antenna device 20. When the user actually uses the electronic device 100, since the overall SAR value is reduced, the power backoff caused by the SAR value exceeding the standard can be reduced, and even power backoff is not required, thereby improving the communication performance of the electronic device 100.

[0054] In some embodiments, reference Figure 4 , Figure 4 for Figure 2 An example of a structure of the antenna device 20 is shown.

[0055] The first tuning switch 24 includes a plurality of tuning paths, for example, a first tuning path 1, a second tuning path 2, and a third tuning path 3. The first tuning path 1, the second tuning path 2, and the third tuning path 3 are all electrically connected to the first tuning point 21b. For example, the first tuning path 1 is electrically connected to the first tuning point 21b through the first inductor L1, the second tuning path 2 is electrically connected to the first tuning point 21b through the second inductor L2, and the third tuning path 3 is directly electrically connected to the first tuning point 21b. The inductance values ​​of the first inductor L1 and the second inductor L2 may be the same or different. Each tuning path can be connected or disconnected. When the tuning path is connected, it means that the tuning path is grounded, and when it is disconnected, it means that the tuning path is disconnected from the ground.

[0056] In practical applications, tuning of different frequency bands can be achieved by combining the states of the first tuning path 1, the second tuning path 2, and the third tuning path 3. Specifically, when the first tuning path 1, the second tuning path 2, and the third tuning path 3 are all disconnected, the first radiator 21 is used to radiate wireless signals of the first frequency band. When the first tuning path 1 is connected, and the second tuning path 2 and the third tuning path 3 are all disconnected, the first radiator 21 is used to radiate wireless signals of the second frequency band. When the first tuning path 1, the second tuning path 2 are all connected, and the third tuning path 3 is disconnected, the first radiator 21 is used to radiate wireless signals of the third frequency band. When the first tuning path 1, the second tuning path 2, and the third tuning path 3 are all connected, the first radiator 21 is used to radiate wireless signals of the fourth frequency band.

[0057] In an application example, the first frequency band is the B28 frequency band, and the frequency range is: uplink frequency 703MHz~748MHz, downlink frequency 758MHz~803MHz. The second frequency band is the B20 frequency band, and the frequency range is: uplink frequency 832MHz~862MHz, downlink frequency 791MHz~821MHz. The third frequency band is the B5 frequency band, and the frequency range is: uplink frequency 824MHz~849MHz, downlink frequency 869MHz~894MHz. The fourth frequency band is the B8 frequency band, and the frequency range is: uplink frequency 880MHz~915MHz, downlink frequency 925MHz~960MHz.

[0058] The switch states of each tuning path of the first tuning switch 24 and the corresponding frequency bands are shown in Table 1.

[0059] Table 1 Correspondence between the first tuning switch state and frequency band

[0060] Frequency band Switch Status Switch logic value Status Description B28 all off 0 All channels are disconnected B20 RF1 1 Path 1 connected B5 RF1+2 3 Path 1 and 2 are both connected B8 RF1+2+3 7 Paths 1, 2, and 3 are all connected

[0061] Also refer to Figure 5 and Figure 6 , Figure 5 for Figure 4 The first current transmission schematic diagram of the antenna device 20 is shown, Figure 6 for Figure 4 A second current transmission schematic diagram of the antenna device 20 is shown.

[0062] When the first radiator 21 operates in the B28 frequency band, the first radiator 21 generates a first current I 1 and the second current I 2 The first current I 1 The first current I flows from the first feeding point 21a to the second free end 21d. 1 is the current in the quarter-wavelength mode. The second current I 2 Flows from the first feeding point 21a to the first free end 21c.

[0063] When the first radiator 21 operates in any frequency band among B20, B5, and B8, the second radiator 21 generates a third current I 3 The third current I 3 The third current I flows from the first feeding point 21a to the first free end 21c. 3 is the current in the quarter-wavelength mode.

[0064] In some embodiments, continue to refer to Figure 4 The first tuning switch 24 further includes a fourth tuning path 4. The fourth tuning path 4 is electrically connected to the first tuning point 21b. For example, the fourth tuning path 4 is electrically connected to the first tuning point 21b through the third inductor L3. The fourth tuning path 4 can be turned on or off.

[0065] The fourth tuning path 4 is used to switch the frequency band of the wireless signal radiated when the first radiator 21 transmits the first excitation signal, or to switch to isolate the transmission path and the receiving path when the first radiator 21 transmits the wireless signal. For example, the fourth tuning path 4 can cooperate with the first tuning path 1, the second tuning path 2, and the third tuning path 3. When the first tuning path 1, the second tuning path 2, the third tuning path 3, and the fourth tuning path 4 are all connected, the first radiator 21 can radiate wireless signals different from the B28, B20, B5, and B8 frequency bands. For another example, when the first radiator 21 transmits a wireless signal to the outside world, the fourth tuning path 4 is connected; when the first radiator 21 receives a wireless signal from the outside world, the fourth tuning path 4 is disconnected to isolate the transmission path and the receiving path when the first radiator 21 transmits a wireless signal.

[0066] In some embodiments, reference Figure 7 , Figure 7 This is a third structural schematic diagram of the antenna device 20 provided in an embodiment of the present application.

[0067] The antenna device 20 further includes a first matching circuit 27. The first matching circuit 27 is electrically connected to the first feeding point 21a. The first feed source 25 is electrically connected to the first matching circuit 27 to achieve electrical connection with the first feeding point 21a. The first matching circuit 27 is used to provide impedance matching for the first radiator 21 to transmit the first excitation signal.

[0068] In some embodiments, the first matching circuit 27 includes a fourth inductor L4, a fifth inductor L5 and a first capacitor C1. One end of the fifth inductor L5 is electrically connected to the first feed point 21a, and the other end is electrically connected to the first feed source 25. One end of the fourth inductor L4 is connected between the first feed point 21a and the fifth inductor L5, and the other end is grounded. One end of the first capacitor C1 is connected between the fifth inductor L5 and the first feed source 25, and the other end is grounded.

[0069] In some embodiments, reference Figure 8 , Figure 8 This is a fourth structural schematic diagram of the antenna device 20 provided in an embodiment of the present application.

[0070] The second radiator 22 further includes a second tuning point 22b and a grounding point 22c, wherein the grounding point 22c is grounded. The second feeding point 22a is close to the third radiator 23, the grounding point 22c is far away from the third radiator 23, and the second tuning point 22b is located between the second feeding point 22a and the grounding point 22c.

[0071] The antenna device 20 further includes a second tuning switch 28. The second tuning switch 28 can be represented as SW2. The second tuning switch 28 is electrically connected to the second tuning point 22b, and the second tuning switch 28 is grounded. The second tuning switch 28 is used to switch the frequency band of the wireless signal radiated when the second radiator 22 and the third radiator 23 jointly transmit the second excitation signal. Therefore, the second radiator 22 and the third radiator 23 can radiate wireless signals of multiple frequency bands, thereby further expanding the bandwidth of the antenna device 20.

[0072] In some embodiments, reference Fig. 9 , Fig. 9 This is a fifth structural schematic diagram of the antenna device 20 provided in an embodiment of the present application.

[0073] The second radiator 22 includes a third radiating section 221 and a fourth radiating section 222, and the third radiating section 221 is connected to the fourth radiating section 222. The second feeding point 22a, the second tuning point 22b, and the grounding point 22c are all arranged in the third radiating section 221. The fourth radiating section 222 is provided with a grounding point 222a, and the grounding point 222a is grounded. In practical applications, the third radiating section 221 and the fourth radiating section 222 can be perpendicular to each other.

[0074] In some embodiments, reference Fig.10 , Fig.10 for Figure 8 An example of a structure of the antenna device 20 is shown.

[0075] The second tuning switch 28 includes a fifth tuning path 5, a sixth tuning path 6, and a seventh tuning path 7. The fifth tuning path 5, the sixth tuning path 6, and the seventh tuning path 7 are all electrically connected to the second tuning point 22b. For example, the fifth tuning path 5 is electrically connected to the second tuning point 22b through the sixth inductor L6, the sixth tuning path 6 is electrically connected to the second tuning point 22b through the seventh inductor L7, and the seventh tuning path 7 is electrically connected to the second tuning point 22b through the eighth inductor L8. The inductance values ​​of the sixth inductor L6, the seventh inductor L7, and the eighth inductor L8 can be the same or different. Each tuning path can be connected or disconnected.

[0076] In practical applications, tuning of different frequency bands can be achieved by combining the states of the fifth tuning path 5, the sixth tuning path 6, and the seventh tuning path 7. Specifically, when the fifth tuning path 5, the sixth tuning path 6, and the seventh tuning path 7 are all disconnected, the second radiator 22 and the third radiator 23 are used to radiate wireless signals in the fifth frequency band. When the fifth tuning path 5 is connected, and the sixth tuning path 6 and the seventh tuning path 7 are all disconnected, the second radiator 22 and the third radiator 23 are used to radiate wireless signals in the sixth frequency band. When the fifth tuning path 5, the sixth tuning path 6, and the seventh tuning path 7 are all connected, the second radiator 22 and the third radiator 23 are used to radiate wireless signals in the seventh frequency band. When the fifth tuning path 5, the sixth tuning path 6, and the seventh tuning path 7 are all connected, the second radiator 22 and the third radiator 23 are used to radiate wireless signals in the eighth frequency band.

[0077] In an application example, the fifth frequency band is the B3 frequency band, and the frequency range is: uplink frequency 1710MHz~1785MHz, downlink frequency 1805MHz~1880MHz. The sixth frequency band is the B1 frequency band, and the frequency range is: uplink frequency 1920MHz~1980MHz, downlink frequency 2110MHz~2170MHz. The seventh frequency band is the B40 frequency band, and the frequency range is 2300MHz~2400MHz. The eighth frequency band is the B41 frequency band, and the frequency range is 2496MHz~2690MHz.

[0078] The switch states of each tuning path of the second tuning switch 28 and the corresponding frequency bands are shown in Table 2.

[0079] Table 2 Correspondence between the second tuning switch state and frequency band

[0080] Frequency band Switch Status Switch logic value Status Description B3 all off 0 All channels are disconnected B1 RF5 1 Path 5 connected B40 RF5+6 3 Paths 5 and 6 are both connected B41 RF5+6+7 7 Paths 5, 6, and 7 are all connected

[0081] In some embodiments, reference Fig.11 , Fig.11 This is a sixth structural schematic diagram of the antenna device 20 provided in an embodiment of the present application.

[0082] The second radiator 22 includes a third free end 22d facing the third radiator 23. The second feeding point 22a, the second tuning point 22b, and the grounding point 22c are respectively away from the third free end 22d. The third radiator 23 includes a first end 23a facing the second radiator 22 and a second end 23b away from the second radiator 22. It can be understood that the second end 23b faces the first radiator 21.

[0083] Also refer to Fig.12 and Fig.13 , Fig.12 for Fig.11The first current transmission schematic diagram of the antenna device 20 is shown, Fig.13 for Fig.11 A second current transmission schematic diagram of the antenna device 20 is shown.

[0084] When the second radiator 22 and the third radiator 23 operate in the B3 or B1 frequency band, a fourth current I 4 and the fifth current I 5 The fourth current I 4 The fourth current I 4 is the current in the quarter-wavelength mode. The fifth current I 5 The fifth current I is transmitted on the third radiator 23 and flows from the first end 23a to the second end 23b. 5 For a weaker current.

[0085] When the second radiator 22 and the third radiator 23 operate in the B40 or B41 frequency band, a sixth current I 6 , the seventh current I 7 and the eighth current I 8 The sixth current I 6 The sixth current I is transmitted on the second radiator 22 and flows from the ground point 22c to the third free end 22d. 6 is the current of the quarter-wavelength mode. The seventh current I 7 The seventh current I is transmitted on the second radiator 22 and flows from the second tuning point 22b to the third free end 22d. 7 is the current of the quarter-wavelength mode. 8 The eighth current I is transmitted on the third radiator 23 and flows from the first end 23a to the second end 23b. 8 For stronger current.

[0086] It can be understood that the fifth current I 5 is a weaker current, the eighth current I 8 is a stronger current, so the fifth current I 5 Less than the eighth current I 8 .

[0087] In some embodiments, continue to refer to Fig.10 The second tuning switch 28 further includes an eighth tuning path 8. The eighth tuning path 8 is suspended.

[0088] In some embodiments, reference Fig.14 , Fig.14 This is a seventh structural schematic diagram of the antenna device 20 provided in an embodiment of the present application.

[0089] The antenna device 20 further includes a second matching circuit 29. The second matching circuit 29 is electrically connected to the second feeding point 22a. The second feed source 26 is electrically connected to the second matching circuit 29 to achieve electrical connection with the second feeding point 22a. The second matching circuit 29 is used to provide impedance matching for the second radiator 22 and the third radiator 23 to transmit the second excitation signal.

[0090] In some embodiments, the second matching circuit 29 includes a second capacitor C2 . One end of the second capacitor C2 is electrically connected to the second feeding point 22 a , and the other end of the second capacitor C2 is electrically connected to the second feed source 26 .

[0091] In some embodiments, reference Fig.15 , Fig.15 A second structural diagram of the electronic device 100 provided in an embodiment of the present application.

[0092] The housing 10 includes a metal frame 11 and a metal middle frame 12. The metal frame 11 may form the outer periphery of the electronic device 100. The metal middle frame 12 may form the overall framework of the electronic device 100.

[0093] In the embodiment of the present application, at least one of the first radiator 21, the second radiator 22, and the third radiator 23 of the antenna device 20 can be formed by the metal frame 11. In the case where the antenna device 20 includes the second radiator 22 and the third radiator 23 but does not include the first radiator 21, at least one of the second radiator 22 and the third radiator 23 can be formed by the metal frame 11. For example, Fig.15 As shown, the metal frame 11 includes a first metal branch 111, a second metal branch 112 and a third metal branch 113, for example, the first metal branch 111, the second metal branch 112 and the third metal branch 113 can be formed by opening a gap on the metal frame 11. Among them, the first metal branch 111 can form a first radiator 21, the second metal branch 112 can form a second radiator 22, and the third metal branch 113 can form a third radiator 23.

[0094] Therefore, the metal frame 11 can be reused without separately providing the first radiator 21 , the second radiator 22 and the third radiator 23 , which can reduce the number of radiators in the electronic device 100 and thus reduce the internal layout space occupied by the electronic device 100 .

[0095] It is understandable that in some other embodiments, one or two metal branches may be formed on the metal frame 11. When one metal branch is formed on the metal frame 11, any one of the first radiator 21, the second radiator 22, and the third radiator 23 may be formed by the metal branch. When two metal branches are formed on the metal frame 11, any two of the first radiator 21, the second radiator 22, and the third radiator 23 may be formed by the two metal branches.

[0096] In some embodiments, reference Fig.16 , Fig.16 A schematic diagram of the structure of a metal frame 11 of an electronic device provided in an embodiment of the present application.

[0097] The metal frame 11 includes a first side 11a, a second side 11b, a third side 11c, and a fourth side 11d connected in sequence. The first side 11a is opposite to the third side 11c, and the first side 11a and the third side 11c are the long sides of the metal frame 11. The second side 11b is opposite to the fourth side 11d, and the second side 11b and the fourth side 11d are the short sides of the metal frame 11. In the scenario where the user uses the electronic device in portrait mode, the first side 11a and the third side 11c are located on the left and right sides of the electronic device, and the second side 11b and the fourth side 11d are located on the upper and lower ends of the electronic device.

[0098] The second radiator 22 and the third radiator 23 of the antenna device 20 are both formed by the metal frame 11. The second radiator 22 and the third radiator 23 are both formed on the second side 11b or the fourth side 11d of the metal frame 11. Fig.16 As shown, the second radiator 22 and the third radiator 23 may both be formed on the fourth side 11d.

[0099] In some embodiments, the first radiator 21 of the antenna device 20 may also be formed by the metal frame 11. Fig.16 As shown, the first radiation section 211 of the first radiator 21 may be formed on the first side 11 a , and the second radiation section 212 of the first radiator 21 may be formed on the fourth side 11 d .

[0100] refer to Figures 17 to 22 , Fig.17 This is a schematic diagram of S11 simulation of the antenna device 20 transmitting a low-frequency signal according to an embodiment of the present application. Fig.18 This is a schematic diagram of S11 simulation of the antenna device 20 transmitting medium and high frequency signals provided in an embodiment of the present application. Fig.19 This is a schematic diagram of current distribution when the antenna device 20 provided in an embodiment of the present application radiates wireless signals in the B3 frequency band. Fig. 20This is a schematic diagram of current distribution when the antenna device 20 provided in an embodiment of the present application radiates wireless signals in the B1 frequency band. Fig.21 This is a schematic diagram of SAR hot spots of the antenna device 20 provided in an embodiment of the present application at the B3 frequency band. Fig. 22 A schematic diagram of SAR hotspots of the antenna device 20 provided in an embodiment of the present application at the B1 frequency band.

[0101] like Fig.17 As shown, Fig.17 The midpoint 1 is the resonant frequency of the B5 frequency band, the point 2 is the resonant frequency of the B8 frequency band, the point 3 is the resonant frequency of the B20 frequency band, and the point 4 is the resonant frequency of the B28 frequency band.

[0102] like Fig.18 As shown, Fig.18 The midpoint 1 is the resonant frequency of the B1 frequency band, the point 2 is the resonant frequency of the B3 frequency band, the point 3 is the resonant frequency of the B40 frequency band, and the point 4 is the resonant frequency of the B41 frequency band.

[0103] like Fig.19 and Fig. 20 As can be seen from the figure, the current distribution at the third radiator 23 is weak and there is no strong current point.

[0104] like Fig.21 and Fig. 22 As can be seen from the figure, the SAR hotspot at the third radiator 23 is relatively weak, which can reduce the overall SAR value of the antenna device 20.

[0105] It should be noted that in the embodiments of the present application, "electrical connection" can be achieved by direct connection between two electrical components to achieve electrical connection, or it can be achieved by indirect connection to achieve electrical connection. For example, A and B are electrically connected, which can be achieved by direct connection between A and B, or it can be achieved by indirect connection between A and B through one or more other electrical components.

[0106] In the description of this application, it should be understood that terms such as "first" and "second" are only used to distinguish similar objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0107] The antenna device and electronic device provided in the embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. An antenna device, characterized in that: include: A second radiator, comprising a second feeding point, wherein the second feeding point is used to feed a second excitation signal; a third radiator, spaced apart from the second radiator and electromagnetically coupled to the second radiator, the third radiator being suspended; The third radiator and the second radiator are used to jointly transmit the second excitation signal. When the second excitation signal is jointly transmitted, the current intensity point is located at the second radiator.

2. The antenna device according to claim 1, characterized in that The second radiator also includes a second tuning point; The antenna device also includes a second tuning switch electrically connected to the second tuning point, the second tuning switch is grounded, and the second tuning switch is used to switch the frequency band of the wireless signal radiated when the second radiator and the third radiator jointly transmit the second excitation signal.

3. The antenna device according to claim 2, characterized in that The second tuning switch includes a fifth tuning path, a sixth tuning path, and a seventh tuning path, and the fifth tuning path, the sixth tuning path, and the seventh tuning path are all electrically connected to the second tuning point.

4. The antenna device according to claim 3, characterized in that: When the fifth tuning path, the sixth tuning path, and the seventh tuning path are all disconnected, the second radiator and the third radiator are used to radiate wireless signals in the fifth frequency band; When the fifth tuning path is connected, and the sixth tuning path and the seventh tuning path are disconnected, the second radiator and the third radiator are used to radiate wireless signals in the sixth frequency band; When the fifth tuning path and the sixth tuning path are both connected and the seventh tuning path is disconnected, the second radiator and the third radiator are used to radiate wireless signals in the seventh frequency band; When the fifth tuning path, the sixth tuning path, and the seventh tuning path are all connected, the second radiator and the third radiator are used to radiate wireless signals in the eighth frequency band.

5. The antenna device according to claim 4, characterized in that: The fifth frequency band is the B3 frequency band, the sixth frequency band is the B1 frequency band, the seventh frequency band is the B40 frequency band, and the eighth frequency band is the B41 frequency band.

6. The antenna device according to claim 5, characterized in that The second radiator further includes a grounding point, the grounding point is grounded, the second radiator includes a third free end facing the third radiator, the second feeding point, the second tuning point, and the grounding point are sequentially away from the third free end, and the third radiator includes a first end facing the second radiator and a second end away from the second radiator; When the second radiator and the third radiator operate in the B3 or B1 frequency band, a fourth current and a fifth current are generated, wherein the fourth current flows from the ground point to the third free end, the fourth current is a current in a quarter-wavelength mode, and the fifth current flows from the first end to the second end; When the second radiator and the third radiator operate in the B40 or B41 frequency band, a sixth current, a seventh current and an eighth current are generated, the sixth current flows from the ground point to the third free end, the sixth current is a current in a quarter-wavelength mode, the seventh current flows from the second tuning point to the third free end, the seventh current is a current in a quarter-wavelength mode, and the eighth current flows from the first end to the second end; Wherein, the fifth current is smaller than the eighth current.

7. The antenna device according to any one of claims 2 to 6, characterized in that: The second tuning switch further includes an eighth tuning path, and the eighth tuning path is suspended.

8. The antenna device according to any one of claims 1 to 6, characterized in that: Also includes: a second matching circuit, electrically connected to the second feeding point; A second feed source is electrically connected to the second matching circuit, and the second feed source is used to provide the second excitation signal.

9. The antenna device according to any one of claims 1 to 6, characterized in that: Also includes: a first radiator, spaced apart from the third radiator, the third radiator being located between the first radiator and the second radiator, the first radiator comprising a first feeding point and a first tuning point, the first feeding point being used to feed a first excitation signal; A first tuning switch is electrically connected to the first tuning point, the first tuning switch is grounded, and the first tuning switch is used to switch the frequency band of the wireless signal radiated by the first radiator when transmitting the first excitation signal.

10. The antenna device according to claim 9, characterized in that: The first tuning switch includes a first tuning path, a second tuning path, and a third tuning path. The first tuning path, the second tuning path, and the third tuning path are all electrically connected to the first tuning point.

11. The antenna device according to claim 10, characterized in that: When the first tuning path, the second tuning path, and the third tuning path are all disconnected, the first radiator is used to radiate wireless signals in the first frequency band; When the first tuning path is connected, and the second tuning path and the third tuning path are disconnected, the first radiator is used to radiate wireless signals in the second frequency band; When the first tuning path and the second tuning path are both connected and the third tuning path is disconnected, the first radiator is used to radiate wireless signals in a third frequency band; When the first tuning path, the second tuning path, and the third tuning path are all connected, the first radiator is used to radiate wireless signals in a fourth frequency band.

12. The antenna device according to claim 11, characterized in that: The first frequency band is the B28 frequency band, the second frequency band is the B20 frequency band, the third frequency band is the B5 frequency band, and the fourth frequency band is the B8 frequency band.

13. The antenna device according to claim 12, characterized in that: The first radiator includes a first radiating section and a second radiating section, the first feeding point is located in the first radiating section, the first tuning point is located in the second radiating section, the second radiating section is connected to the first radiating section and is perpendicular to each other, the first radiating section includes a first free end facing away from the second radiating section, and the second radiating section includes a second free end facing away from the first radiating section; When the first radiator operates in the B28 frequency band, a first current and a second current are generated, the first current flows from the first feeding point to the second free end, the first current is a quarter-wavelength mode current, and the second current flows from the first feeding point to the first free end; When the first radiator operates in any frequency band among B20, B5, and B8, a third current is generated. The third current flows from the first feeding point to the first free end. The third current is a quarter-wavelength mode current.

14. The antenna device according to claim 9, characterized in that The first tuning switch further includes a fourth tuning path, wherein the fourth tuning path is electrically connected to the first tuning point; The fourth tuning path is used to switch the frequency band of the wireless signal radiated by the first radiator when transmitting the first excitation signal, or to switch to isolate the transmitting path and the receiving path when the first radiator transmits the wireless signal.

15. The antenna device according to claim 9, characterized in that Also includes: a first matching circuit, electrically connected to the first feeding point; A first feed source is electrically connected to the first matching circuit, and the first feed source is used to provide the first excitation signal.

16. An electronic device, characterized in that: The antenna device comprises any one of claims 1 to 15.

17. The electronic device according to claim 16, characterized in that: The electronic device comprises a metal frame, and at least one of the second radiator and the third radiator of the antenna device is formed by the metal frame.

18. The electronic device according to claim 17, characterized in that: The metal frame includes a first side, a second side, a third side and a fourth side connected in sequence, the first side and the third side are long sides of the metal frame, and the second side and the fourth side are short sides of the metal frame; Wherein, the second radiator and the third radiator are both formed by the metal frame, and the second radiator and the third radiator are both formed on the second side or the fourth side.

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