Antenna device, electronic device, and antenna switching method

Abstract

This application provides an antenna device, electronic device, and antenna switching method. The antenna device includes: a first radiator, including a first feed point and a second feed point; a second radiator coupled to the first radiator through a first gap; and a third radiator coupled to the first radiator through a second gap. When an excitation signal is fed into the first feed point, the second feed point is grounded, and the antenna device generates a first resonant mode and a second resonant mode. When an excitation signal is fed into the second feed point, the first feed point is grounded, and the antenna device generates a third resonant mode and a fourth resonant mode. The antenna device of this application can switch feed points when the user's hand grips the antenna, affecting its communication performance, thereby switching the resonant modes of the antenna device, reducing the impact of the user's hand grip on the antenna, and improving the communication performance of the antenna device.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to an antenna device, electronic device, and antenna switching method. Background Technology

[0002] Electronic devices such as smartphones typically have multiple antennas, such as LB (Lower Band) antennas, MHB (Middle High Band) antennas, and WIFI antennas, to achieve corresponding communication functions.

[0003] During actual use of electronic devices, users may grip the antenna area, causing it to become stuck and affecting the communication performance of the electronic device. Summary of the Invention

[0004] This application provides an antenna device, electronic device, and antenna switching method, which can reduce the impact of the user's hand grip on the antenna and improve the communication performance of the antenna device.

[0005] This application provides an antenna device, including:

[0006] The first radiator includes a first end, a second end, and a first feed point and a second feed point disposed between the first end and the second end, wherein the second feed point is located between the first feed point and the second end;

[0007] A second radiator has a first gap between one end of the second radiator and the first end, the second radiator is coupled to the first radiator through the first gap, and the other end of the second radiator is grounded.

[0008] A third radiator has a second gap between one end of the third radiator and the second end, the third radiator is coupled to the first radiator through the second gap, and the other end of the third radiator is grounded;

[0009] When the excitation signal is fed into the first feed point, the second feed point is grounded. The antenna device generates a first resonant mode and a second resonant mode. The first resonant mode is generated by the first radiator, and the second resonant mode is generated by the first radiator and the second radiator together. In the second resonant mode, the resonant current intensity generated on the second radiator is greater than the resonant current intensity generated on the first radiator.

[0010] When the excitation signal is fed into the second feed point, the first feed point is grounded, and the antenna device generates a third resonant mode and a fourth resonant mode. The third resonant mode is generated by the first radiator, and the fourth resonant mode is generated by the first radiator and the third radiator together. In the fourth resonant mode, the resonant current intensity generated on the third radiator is greater than the resonant current intensity generated on the first radiator.

[0011] This application also provides an electronic device including the antenna device described above.

[0012] This application also provides an antenna switching method, applied to the above-mentioned electronic device, the antenna switching method including:

[0013] When feeding the excitation signal to the first radiator through the first feed point, it is determined whether the first end is being held. If the first end is being held, the excitation signal is switched to be fed to the first radiator through the second feed point; or

[0014] When the excitation signal is fed to the first radiator through the second feed point, it is determined whether the second end is held. If the second end is held, the excitation signal is switched to be fed to the first radiator through the first feed point.

[0015] The antenna device provided in this application embodiment, by setting dual feed points, that is, setting a first feed point and a second feed point on the first radiator, can feed an excitation signal to the first radiator through both the first feed point and the second feed point. Therefore, when the user's hand affects the communication performance of the antenna device, the feed point can be switched, for example, switching the excitation signal from the first feed point to the second feed point, or vice versa, thereby switching the resonant mode of the antenna device, reducing the impact of the user's hand on the antenna, and improving the communication performance of the antenna device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first structure of the antenna device according to an embodiment of this application.

[0018] Figure 2 for Figure 1The diagram shows the first type of resonant current distribution of the antenna device.

[0019] Figure 3 for Figure 1 The diagram shows the second type of resonant current distribution of the antenna device.

[0020] Figure 4 This is a schematic diagram of a second structure of the antenna device according to an embodiment of this application.

[0021] Figure 5 for Figure 4 The diagram shows the structure of the first matching module of the antenna device.

[0022] Figure 6 for Figure 4 The diagram shows the structure of the second matching module of the antenna device.

[0023] Figure 7 This is a schematic diagram of a third structure of the antenna device according to an embodiment of this application.

[0024] Figure 8 This is a schematic diagram of a fourth structure of the antenna device according to an embodiment of this application.

[0025] Figure 9 This is a schematic diagram of the structure of the third matching module and the fourth matching module of the antenna device according to an embodiment of this application.

[0026] Figure 10 This is a schematic diagram of the simulation results of the antenna device according to an embodiment of this application.

[0027] Figure 11 This is a schematic diagram illustrating the application scenario of the antenna device according to an embodiment of this application.

[0028] Figure 12 This is a schematic diagram comparing the antenna efficiency of the antenna device according to an embodiment of this application before and after switching the feed point.

[0029] Figure 13 This is a schematic diagram of the first structure of an electronic device according to an embodiment of this application.

[0030] Figure 14 This is a schematic diagram of a second structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] This application provides an antenna device that can be applied to electronic devices. These electronic devices may include, for example, smartphones, tablets, gaming devices, AR (Augmented Reality) devices, laptops, desktop computing devices, and other devices with wireless communication capabilities.

[0033] refer to Figure 1 , Figure 1 This is a schematic diagram of a first structure of the antenna device 10 according to an embodiment of this application. The antenna device 10 includes a first radiator 11, a second radiator 12, a third radiator 13, a first feed source P1, and a second feed source P2.

[0034] The first radiator 11, the second radiator 12, and the third radiator 13 can all be antenna radiators in the form of FPC (Flexible Printed Circuit), LDS (Laser Direct Structure), or PDS (Printing Direct Structure), or they can be antenna radiators formed by conductor structures inside electronic devices, metal traces on circuit boards, etc. In practical applications, the first radiator 11, the second radiator 12, and the third radiator 13 can be antenna radiators of different or the same form. The shape and size of the first radiator 11, the second radiator 12, and the third radiator 13 can be set according to actual needs.

[0035] The first radiator 11 includes a first end 111, a second end 112, a first feed point 113, and a second feed point 114. For example, when the first radiator 11 is elongated, the first end 111 and the second end 112 can be two opposite ends of the first radiator 11. The first feed point 113 and the second feed point 114 are both located between the first end 111 and the second end 112. The second feed point 114 is located between the first feed point 113 and the second end 112, or it can be understood that the first feed point 113 is located between the second feed point 114 and the first end 111. Both the first feed point 113 and the second feed point 114 can be used to feed in an excitation signal to excite the first radiator 11 to resonate and radiate a wireless signal. Furthermore, the first feed point 113 and the second feed point 114 can also be grounded to achieve grounding of the first radiator 11.

[0036] The second radiator 12 is disposed at a distance from the first radiator 11. A first gap 10a is formed between one end of the second radiator 12 and the first end 111 of the first radiator 11. The second radiator 12 is coupled to the first radiator 11 through the first gap 10a. The other end of the second radiator 12 is grounded, that is, the end of the second radiator 12 away from the first gap 10a is grounded. Therefore, after an excitation signal is fed into the first radiator 11, a coupling current is generated on the second radiator 12 through the coupling between the first radiator 11 and the second radiator 12, causing the second radiator 12 to also resonate and radiate a wireless signal.

[0037] The third radiator 13 is spaced apart from the first radiator 11. A second gap 10b is formed between one end of the third radiator 13 and the second end 112 of the first radiator 11. The third radiator 13 is coupled to the first radiator 11 through the second gap 10b. The other end of the third radiator 13 is grounded, that is, the end of the third radiator 13 furthest from the second gap 10b is grounded. Therefore, after an excitation signal is fed into the first radiator 11, a coupling current is generated on the third radiator 13 through the coupling between the first radiator 11 and the third radiator 13, causing the third radiator 13 to also resonate and radiate a wireless signal.

[0038] The first feed source P1 and the second feed source P2 can be mounted on the circuit board of the electronic device, such as on the motherboard, or on a separate small board. Both the first feed source P1 and the second feed source P2 can provide the aforementioned excitation signal. It should be noted that the first feed source P1 and the second feed source P2 provide the same excitation signal. This excitation signal can be a 4G, 5G, or WIFI type excitation signal. For example, in one application example, this excitation signal can be a 4G MHB (frequency range between 1000MHz and 3000MHz) band excitation signal.

[0039] The first feed source P1 is electrically connected to the first feed point 113, and this electrical connection can also be disconnected. The second feed source P2 is electrically connected to the second feed point 114, and this electrical connection can also be disconnected. In practical applications, the excitation signal can be fed to the first radiator 11 from the first feed source P1 through the first feed point 113, or the excitation signal can be fed to the first radiator 11 from the second feed source P2 through the second feed point 114.

[0040] In this embodiment, when the excitation signal is fed into the first feed point 113, the second feed point 114 is grounded. At this time, the antenna device 10 generates a first resonant mode and a second resonant mode. The first resonant mode is generated by the first radiator 11, and the second resonant mode is generated jointly by the first radiator 11 and the second radiator 12. In the second resonant mode, the resonant current intensity generated on the second radiator 12 is greater than the resonant current intensity generated on the first radiator 11.

[0041] When the excitation signal is fed into the second feed point 114, the first feed point 113 is grounded. At this time, the antenna device 10 generates a third resonant mode and a fourth resonant mode. The third resonant mode is generated by the first radiator 11, and the fourth resonant mode is generated jointly by the first radiator 11 and the third radiator 13. In the fourth resonant mode, the resonant current intensity generated on the third radiator 13 is greater than the resonant current intensity generated on the first radiator 11.

[0042] Also refer to Figure 2 , Figure 2 for Figure 1 The diagram shows a first type of resonant current distribution for the antenna device 10. When the first feed source P1 is connected to the first feed point 113, the second feed source P2 is disconnected from the second feed point 114, and the second feed point 114 is grounded. In this case, the excitation signal is fed from the first feed source P1 to the first radiator 11 through the first feed point 113. At this time, the antenna device 10 generates the aforementioned first and second resonant modes and radiates wireless signals to the outside. Figure 2 As shown, in the first resonant mode, a first resonant current I1 is generated on the first radiator 11; in the second resonant mode, a second resonant current I2 is generated on the first radiator 11, and a third resonant current I3 is generated on the second radiator 12. The intensity of the third resonant current I3 generated on the second radiator 12 is greater than the intensity of the second resonant current I2 generated on the first radiator 11.

[0043] In practical applications, the first resonant mode can be a half-wavelength mode of the first radiator 11, meaning the length of the first radiator 11 is half the wavelength of the first resonant mode, which is the wavelength corresponding to the center frequency of the first resonant mode. In one application example, the frequency band of the first resonant mode can be the B3 band (uplink frequency range of 1710MHz~1785MHz, downlink frequency range of 1805MHz~1880MHz), the B1 band (uplink frequency range of 1920MHz~1980MHz, downlink frequency range of 2110MHz~2170MHz), etc.

[0044] In the second resonant mode, the first radiator 11 generates a quarter-wavelength mode from the first feed point 113 to the first end 111, meaning the length from the first feed point 113 to the first end 111 is one-quarter of the wavelength of the second resonant mode, which is the wavelength corresponding to the center frequency of the second resonant mode. In one application example, the frequency band of the second resonant mode can be the B40 band (frequency range of 2300MHz to 2400MHz), the B41 band (frequency range of 2496MHz to 2690MHz), or the 2.4GHz band of WIFI (frequency range of 2.4GHz to 2.5GHz).

[0045] In this configuration, antenna device 10 can simultaneously radiate wireless signals in both the first and second resonant modes, such as simultaneously radiating wireless signals in the B3 and B41 bands. Antenna device 10 can simultaneously cover both the B3 and B41 bands, forming a carrier aggregation (CA) mode for the B3 and B41 bands. Therefore, the bandwidth of antenna device 10 can be extended, improving the communication capabilities of the electronic device.

[0046] Also refer to Figure 3 , Figure 3 for Figure 1 The diagram shows a second type of resonant current distribution for the antenna device 10. When the second feed source P2 is connected to the second feed point 114, the first feed source P1 is disconnected from the first feed point 113, and the first feed point 113 is grounded. In this case, the excitation signal is fed from the second feed source P2 through the second feed point 114 to the first radiator 11. At this time, the antenna device 10 generates the aforementioned third and fourth resonant modes and radiates wireless signals to the outside. Figure 3 As shown, in the third resonant mode, a fourth resonant current I4 is generated on the first radiator 11; in the fourth resonant mode, a fifth resonant current I5 is generated on the first radiator 11, and a sixth resonant current I6 is generated on the third radiator 13. The intensity of the sixth resonant current I6 generated on the third radiator 13 is greater than the intensity of the fifth resonant current I5 generated on the first radiator 11.

[0047] In practical applications, the third resonant mode can also be a half-wavelength mode of the first radiator 11, meaning the length of the first radiator 11 is half the wavelength of the third resonant mode, which is the wavelength corresponding to the center frequency of the third resonant mode. In one application example, the frequency band of the third resonant mode can be the B3 band, the B1 band, etc.

[0048] In the fourth resonant mode, the first radiator 11 generates a quarter-wavelength mode from the second feed point 114 to the second end 112, meaning the length from the second feed point 114 to the second end 112 is one-quarter of the wavelength of the fourth resonant mode, which is the wavelength corresponding to the center frequency of the fourth resonant mode. In one application example, the frequency band of the fourth resonant mode can be the B40 band, the B41 band, or the 2.4G band of WIFI.

[0049] In this configuration, antenna device 10 can simultaneously radiate wireless signals in both the third and fourth resonant modes. For example, it can also simultaneously radiate wireless signals in both the B3 and B41 bands. Antenna device 10 can also simultaneously cover both the B3 and B41 bands, forming a carrier aggregation (CA) mode for the B3 and B41 bands. Therefore, it can also extend the bandwidth of antenna device 10 and improve the communication capabilities of electronic devices.

[0050] In practical applications, the antenna device 10 can switch between two feeding methods, namely, it can switch between being fed through the first feeding point 113 and being fed through the second feeding point 114. For example, the user's hand gripping part can be detected by a sensor, and the switching can be performed based on the user's hand gripping part; or the wireless signal radiation efficiency of the antenna device 10 can be detected, and the switching can be performed when the wireless signal radiation efficiency drops significantly.

[0051] When the user's hand is near the first end 111, that is, near the first gap 10a, it will block the first end 111, thereby affecting the wireless signal radiation efficiency of the first resonant mode and the second resonant mode, resulting in a significant decrease in the wireless signal radiation efficiency of the first resonant mode and the second resonant mode. In this case, the excitation signal can be switched from the second feed source P2 to the first radiator 11 through the second feed point 114, so that the antenna device 10 generates the third resonant mode and the fourth resonant mode, thereby avoiding the part held by the user's hand and improving the wireless communication performance.

[0052] When the user's hand is near the second end 112, that is, near the second gap 10b, it will block the second end 112, thereby affecting the wireless signal radiation efficiency of the third and fourth resonant modes, resulting in a significant decrease in the wireless signal radiation efficiency of the third and fourth resonant modes. In this case, the excitation signal can be switched from the first feed source P1 to the first radiator 11 through the first feed point 113, so that the antenna device 10 generates the first resonance and the second resonance, thereby avoiding the part held by the user's hand and improving the wireless communication performance.

[0053] In some embodiments, reference Figure 4 , Figure 4 This is a schematic diagram of a second structure of the antenna device 10 according to an embodiment of this application. The antenna device 10 also includes a first switch K1, a second switch K2, a first matching module M1, and a second matching module M2.

[0054] The first feed source P1 is electrically connected to the first feed point 113 via a first switch K1. The first switch K1 can be a single-pole single-throw switch, such as a switch formed from a semiconductor device like a transistor or switching transistor, which functions as a single-pole single-throw switch. The first switch K1 is used to connect or disconnect the first feed source P1 from the first feed point 113. One end of the first matching module M1 is connected between the first switch K1 and the first feed point 113, and the other end is grounded. The first matching module M1 can be used to switch the resonant frequency band of the antenna device 10.

[0055] The second feed source P2 is electrically connected to the second feed point 114 via a second switch K2. The second switch K2 can be a single-pole single-throw switch, such as a switch formed from a transistor, switching transistor, or other semiconductor device with single-pole single-throw functionality. The second switch K2 is used to connect or disconnect the second feed source P2 from the second feed point 114. One end of the second matching module M2 is connected between the second switch K2 and the second feed point 114, and the other end is grounded. The second matching module M2 can also be used to switch the resonant frequency band of the antenna device 10.

[0056] In practical applications, the antenna device 10 can be switched using the first switch K1 and the second switch K2.

[0057] In the first operating mode, the first switch K1 can be turned on and the second switch K2 can be turned off. In this case, the excitation signal is fed to the first radiator 11 by the first feed source P1 through the first feed point 113, and the second feed point 114 is grounded through the second matching module M2. In addition, the first matching module M1 can be adjusted to the required impedance so that the antenna device 10 matches the required communication frequency band.

[0058] In the second operating mode, the second switch K2 can be turned on, and the first switch K1 can be turned off. In this case, the excitation signal is fed to the first radiator 11 by the second feed source P2 through the second feed point 114, and the first feed point 113 is grounded through the first matching module M1. In addition, the second matching module M2 can be adjusted to the required impedance so that the antenna device 10 matches the required communication frequency band.

[0059] Understandably, in practical applications, both the first matching module M1 and the second matching module M2 are used to switch the resonant frequency band of the antenna device 10. In some scenarios, such as in areas where switching the resonant frequency band of the antenna device 10 is not required, both the first matching module M1 and the second matching module M2 can be replaced with inductors. Therefore, when the first switch K1 is open, the first feed point 113 can be grounded through an inductor; when the second switch K2 is open, the second feed point 114 can be grounded through an inductor.

[0060] In some embodiments, reference Figure 5 , Figure 5 for Figure 4 The diagram shows the structure of the first matching module M1 of the antenna device.

[0061] The first matching module M1 includes multiple first matching paths M11 and a first switching switch K3. Each of the multiple first matching paths M11 has a different impedance, and the specific impedance of each first matching path M11 can be set according to actual needs. In practical applications, each first matching path M11 can include one or more inductors and capacitors. When a first matching path M11 includes both inductors and capacitors, the inductors and capacitors can be connected in series or in parallel. All multiple first matching paths M11 are grounded.

[0062] The first switching switch K3 is a single-pole multi-throw switch, such as a switch with single-pole multi-throw function formed by semiconductor devices such as transistors and switching transistors. One end of the first switching switch K3 is connected between the first switch K1 and the first feed point 113, and the other end is used to select and connect one of the multiple first matching paths M11 to realize the switching of the resonant frequency band of the antenna device 10, for example, switching the above-mentioned first resonant frequency band to the B3 frequency band or the B1 frequency band.

[0063] In some embodiments, reference Figure 6 , Figure 6 for Figure 4 A schematic diagram of the structure of the second matching module of the antenna device 10 shown.

[0064] The second matching module M2 includes multiple second matching paths M21 and a second switching switch K4. Each of the multiple second matching paths M21 has a different impedance, and the specific impedance of each second matching path M21 can be set according to actual needs. In practical applications, each second matching path M21 can include one or more inductors and capacitors. When a second matching path M21 includes both inductors and capacitors, the inductors and capacitors can be connected in series or in parallel. All multiple second matching paths M21 are grounded.

[0065] The second switching switch K4 is a single-pole multi-throw switch, such as a switch with single-pole multi-throw function formed by semiconductor devices such as transistors and switching transistors. One end of the second switching switch K4 is connected between the second switch K2 and the second feed point 114, and the other end is used to select and connect one of the multiple second matching paths M21 to realize the switching of the resonant frequency band of the antenna device 10, for example, switching the above-mentioned second resonant frequency band to the B3 frequency band or the B1 frequency band.

[0066] In some embodiments, reference Figure 7 , Figure 7 This is a schematic diagram of the third structure of the antenna device 10 according to an embodiment of this application.

[0067] A first capacitor C1 can be provided between the first feed source P1 and the first switch K1. The first capacitor C1 can filter the excitation signal provided by the first feed source P1. A second capacitor C2 can be provided between the second feed source P2 and the second switch K2. The second capacitor C2 can filter the excitation signal provided by the second feed source P2.

[0068] In some embodiments, reference Figure 8 , Figure 8 This is a schematic diagram of the fourth structure of the antenna device 10 according to an embodiment of this application.

[0069] The antenna device 10 also includes a third matching module M3 and a fourth matching module M4.

[0070] The second radiator 12 is grounded through the third matching module M3. The third matching module M3 can also switch the resonant frequency band of the antenna device 10 using different impedances, for example, switching the resonant frequency band of the second resonant mode to the B40 band or the B41 band. In practical applications, the specific circuit structure of the third matching module M3 can have various implementation forms.

[0071] The third radiator 13 is grounded through the fourth matching module 14. The fourth matching module M4 can also switch the resonant frequency band of the antenna device 10 through different impedances, for example, switching the frequency band of the above-mentioned fourth resonant mode to the B40 band or the B41 band. In practical applications, the specific circuit structure of the fourth matching module M4 can have various implementation forms.

[0072] It should be noted that in practical applications, only one of the third matching module M3 and the fourth matching module M4 may be provided. For example, the antenna device 10 may include the third matching module M3 but not the fourth matching module M4; or, the antenna device 10 may include the fourth matching module M4 but not the third matching module M3.

[0073] Also refer to Figure 9 , Figure 9This is a schematic diagram of the structure of the third matching module M3 and the fourth matching module M4 of the antenna device according to an embodiment of this application.

[0074] The third matching module M3 and the fourth matching module M4 may include one or more inductors and capacitors. When both inductors and capacitors are included, they can be connected in series or in parallel. The circuit structures of the third matching module M3 and the fourth matching module M4 may be the same or different. Specifically, the circuit structures of the third matching module M3 and the fourth matching module M4 can be... Figure 9 Any one of A to H shown.

[0075] In this diagram, A represents an inductor and capacitor connected in series. B represents a capacitor and inductor connected in parallel. C represents a capacitor and inductor connected in parallel to form a parallel unit, which is then connected in series with the capacitor. D represents a capacitor and inductor connected in parallel to form a parallel unit, which is then connected in series with the inductor. E represents an inductor and capacitor connected in series to form a series unit, which is then connected in parallel with the capacitor. F represents an inductor and capacitor connected in series to form a series unit, which is then connected in parallel with the inductor. G represents a capacitor and inductor connected in parallel to form a parallel unit, which is then connected in series with the two parallel units. H represents an inductor and capacitor connected in series to form a series unit, which is then connected in parallel with the two series units.

[0076] It should be noted that, Figure 9 The examples A through H shown are merely feasible examples. In practical applications, the third matching module M3 and the fourth matching module M4 can also be other circuit structures, which will not be listed here.

[0077] refer to Figure 10 , Figure 10 This is a schematic diagram of the simulation results of the antenna device 10 according to an embodiment of this application. L1 represents the S-parameter curves of the antenna device 10. The S-parameter curves when the excitation signal is fed into the first feed point 113 and the second feed point 114 are substantially coincident. Point 1 represents the resonant frequency band of the first and third resonant modes, for example, the B3 band; point 2 represents the resonant frequency band of the second and fourth resonant modes, for example, the B41 band. L2 represents the total radiation efficiency curve of the antenna device 10, where the total radiation efficiency curves when the excitation signal is fed into the first feed point 113 and the second feed point 114 are substantially coincident. L3 represents the theoretical radiation efficiency curve of the antenna device 10, where the theoretical radiation efficiency curves when the excitation signal is fed into the first feed point 113 and the second feed point 114 are substantially coincident.

[0078] refer to Figure 11 , Figure 11This is a schematic diagram illustrating an application scenario of the antenna device 10 according to an embodiment of this application. When a user is using an electronic device, their finger may press on the first gap 10a, which significantly impacts the communication performance when the excitation signal is fed into the first feed point 113. In this case, the excitation signal can be switched to the second feed point 114 to improve communication performance. In other application scenarios, the user's finger may press on the second gap 10b, which significantly impacts the communication performance when the excitation signal is fed into the second feed point 114. In this case, the excitation signal can be switched to the first feed point 113 to improve communication performance.

[0079] refer to Figure 12 , Figure 12 This is a schematic diagram comparing the antenna efficiency of the antenna device 10 before and after switching the feed point, according to an embodiment of this application. L4 represents the total radiation efficiency curve of the antenna device 10 without being affected by the user's grip; L5 represents the total radiation efficiency curve of the antenna device 10 under the influence of the user's grip; L6 represents the total radiation efficiency curve of the antenna device 10 after being affected by the user's grip and switching the feed point; L7 represents the theoretical radiation efficiency curve of the antenna device 10 without being affected by the user's grip; L8 represents the theoretical radiation efficiency curve of the antenna device 10 under the influence of the user's grip; and L9 represents the theoretical radiation efficiency curve of the antenna device 10 after being affected by the user's grip and switching the feed point. Point 1 represents the resonant frequency band of the first and third resonant modes, for example, the B3 band; point 2 represents the resonant frequency band of the second and fourth resonant modes, for example, the B41 band.

[0080] Taking the resonant frequency bands of the first and third resonant modes as B3 and the resonant frequency bands of the second and fourth resonant modes as B41 as examples, the relevant experimental data are shown in Table 1:

[0081] Table 1. Schematic diagram comparing total radiation efficiency

[0082]

[0083] As shown in Table 1, after the antenna device 10 was affected by the user's grip and the feed point was switched, the total radiation efficiency of the B3 band increased by 2.8 dB, and the total radiation efficiency of the B41 band increased by 5.6 dB. This indicates that after switching the feed point, the total radiation efficiency of the antenna device 10 was significantly improved, thus reducing the impact of the user's grip on the antenna and improving the communication performance of electronic devices.

[0084] The antenna device 10 provided in this application embodiment, by setting dual feed points—that is, a first feed point 113 and a second feed point 114—can feed an excitation signal to the first radiator 11 through both the first feed point 113 and the second feed point 114. Therefore, when the user's grip affects the communication performance of the antenna device 10, the feed points can be switched. For example, the excitation signal can be switched from the first feed point 113 to the second feed point 114, or vice versa. This allows the antenna device 10 to switch resonant modes, such as from the first and second resonant modes to the third and fourth resonant modes, or vice versa, thereby reducing the impact of the user's grip on the antenna and improving the communication performance of the antenna device 10.

[0085] This application also provides an electronic device. This electronic device may be, for example, a smartphone, tablet computer, gaming device, AR (Augmented Reality) device, laptop computer, desktop computing device, or any other device with wireless communication capabilities.

[0086] refer to Figure 13 , Figure 13 This is a schematic diagram of a first structure of an electronic device 100 according to an embodiment of this application. The electronic device 100 includes the antenna device 10 of any of the above embodiments.

[0087] In some embodiments, reference Figure 14 , Figure 14 This is a schematic diagram of a second structure of the electronic device 100 according to an embodiment of this application.

[0088] The electronic device 100 also includes a processor 20. The processor 20 can be mounted on the motherboard of the electronic device 100. The processor 20 is electrically connected to the antenna device 10; for example, the processor 20 can be electrically connected to the first switch K1 and the second switch K2 of the antenna device 10 to control the states of the first switch K1 and the second switch K2. Therefore, the processor 20 can control the switching of the feed point of the antenna device 10 by controlling the states of the first switch K1 and the second switch K2.

[0089] Specifically, the processor 20 can be used to: control the feeding of an excitation signal to the first radiator 11 through the first feed point 113, and control the second feed point 114 to be grounded; or control the feeding of an excitation signal to the first radiator 11 through the second feed point 114, and control the first feed point 113 to be grounded. For example, the processor 20 can control the first switch K1 and the second switch K2 to control the feeding of an excitation signal to the first radiator 11 through one of the first feed point 113 and the second feed point 114, and control the other of the first feed point 113 and the second feed point 114 to be grounded.

[0090] This application also provides an antenna switching method, applied to the aforementioned electronic device 100. The antenna switching method includes:

[0091] When an excitation signal is fed to the first radiator 11 through the first feed point 113, it is determined whether the first end 111 is being held. If the first end 111 is being held, the excitation signal is switched to be fed to the first radiator 11 through the second feed point 114; or

[0092] When feeding an excitation signal to the first radiator 11 through the second feed point 114, it is determined whether the second end 112 is being held. If the second end 112 is being held, the excitation signal is switched to be fed to the first radiator 11 through the first feed point 113.

[0093] Understandably, when feeding an excitation signal to the first radiator 11 through the first feed point 113, if it is determined that the first end 111 is not being held, then the feed point switching need not be performed. Similarly, when feeding an excitation signal to the first radiator 11 through the second feed point 114, if it is determined that the second end 112 is not being held, then the feed point switching need not be performed.

[0094] In practical applications, sensors such as photoelectric sensors, pressure sensors, and capacitance sensors can be set in electronic devices to detect the user's gripping part and determine whether the first end 111 or the second end 112 is being gripped based on the detected gripping part.

[0095] It should be noted that in some embodiments, the wireless signal radiation efficiency of the antenna device 10 can also be detected in real time, and the first end 111 or the second end 112 can be indirectly determined by the wireless signal radiation efficiency. For example, when an excitation signal is fed to the first radiator 11 through the first feed point 113, if a significant decrease in the wireless signal radiation efficiency of the antenna device 10 is detected, such as the decrease in wireless signal radiation efficiency exceeding a preset threshold, it can be determined that the first end 111 is being held; when an excitation signal is fed to the first radiator 11 through the second feed point 114, if a significant decrease in the wireless signal radiation efficiency of the antenna device 10 is detected, such as the decrease in wireless signal radiation efficiency exceeding a preset threshold, it can be determined that the second end 112 is being held.

[0096] In the description of this application, it should be understood that terms such as “first” and “second” are used only to distinguish similar objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0097] The antenna device, electronic device, and antenna switching method provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An antenna device, characterized in that, include: The first radiator includes a first end, a second end, and a first feed point and a second feed point disposed between the first end and the second end, wherein the second feed point is located between the first feed point and the second end; A second radiator has a first gap between one end of the second radiator and the first end, the second radiator is coupled to the first radiator through the first gap, and the other end of the second radiator is grounded. A third radiator has a second gap between one end of the third radiator and the second end, the third radiator is coupled to the first radiator through the second gap, and the other end of the third radiator is grounded; When the excitation signal is fed into the first feed point, the second feed point is grounded. The antenna device generates a first resonant mode and a second resonant mode. The first resonant mode is generated by the first radiator, and the second resonant mode is generated by the first radiator and the second radiator together. In the second resonant mode, the resonant current intensity generated on the second radiator is greater than the resonant current intensity generated on the first radiator. When the excitation signal is fed into the second feed point, the first feed point is grounded, and the antenna device generates a third resonant mode and a fourth resonant mode. The third resonant mode is generated by the first radiator, and the fourth resonant mode is generated by the first radiator and the third radiator together. In the fourth resonant mode, the resonant current intensity generated on the third radiator is greater than the resonant current intensity generated on the first radiator.

2. The antenna device according to claim 1, characterized in that: Both the first resonant mode and the third resonant mode are half-wavelength modes of the first radiator. In the second resonant mode, the first radiator generates a quarter-wavelength mode from the first feed point to the first end. In the fourth resonant mode, the first radiator generates a quarter-wavelength mode from the second feed point to the second end.

3. The antenna device according to claim 1 or 2, characterized in that, Also includes: The first feed source is electrically connected to the first feed point via a first switch. The first switch is used to connect or disconnect the first feed source from the first feed point. The first feed source is used to provide the excitation signal. The first matching module is connected at one end between the first switch and the first power supply point, and at the other end is grounded.

4. The antenna device according to claim 3, characterized in that, The first matching module includes: Multiple first matching paths, each with a different impedance, and each of the multiple first matching paths is grounded; The first switching switch has one end connected between the first switch and the first power supply point, and the other end used to select and connect one of the plurality of first matching paths.

5. The antenna device according to claim 3, characterized in that, Also includes: The second feed source is electrically connected to the second feed point via a second switch. The second switch is used to connect or disconnect the second feed source from the second feed point. The second feed source is used to provide the excitation signal. The second matching module is connected at one end between the second switch and the second feed point, and at the other end to ground.

6. The antenna device according to claim 5, characterized in that, The second matching module includes: Multiple second matching paths, each with a different impedance, and each of the multiple second matching paths is grounded; The second switching switch has one end connected between the second switch and the second power supply point, and the other end used to select and connect one of the plurality of second matching paths.

7. The antenna device according to claim 5, characterized in that: When the first switch is turned on, the second switch is turned off, so that the first feed source feeds the excitation signal through the first feed point, and the second feed point is grounded; When the second switch is turned on, the first switch is turned off, so that the second feed source feeds the excitation signal through the second feed point and grounds the first feed point.

8. The antenna device according to claim 1 or 2, characterized in that, Also includes: The third matching module is used to ground the other end of the second radiator.

9. The antenna device according to claim 1 or 2, characterized in that, Also includes: The fourth matching module is used to ground the other end of the third radiator.

10. An electronic device, characterized in that, Includes the antenna device according to any one of claims 1 to 9.

11. The electronic device according to claim 10, characterized in that, It also includes a processor, which is electrically connected to the antenna device, and the processor is used for: Control the feeding of the excitation signal to the first radiator through the first feed point, and control the second feed point to be grounded; or The excitation signal is fed into the first radiator through the second feed point, and the first feed point is grounded.

12. An antenna switching method, characterized in that, Applied to the electronic device of claim 10 or 11, the antenna switching method includes: When feeding the excitation signal to the first radiator through the first feed point, it is determined whether the first end is being held. If the first end is being held, the excitation signal is switched to be fed to the first radiator through the second feed point; or When the excitation signal is fed to the first radiator through the second feed point, it is determined whether the second end is held. If the second end is held, the excitation signal is switched to be fed to the first radiator through the first feed point.

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