Antenna and terminal device

Abstract

Embodiments of the present application disclose an antenna and a terminal device, which improve the utilization rate of the antenna aperture on the premise of keeping the number of antennas unchanged, effectively save the internal space of the terminal device, and are beneficial to better stacking of the whole machine. The method of the embodiments of the present application includes: a first antenna, a second antenna, a third antenna, and a fourth antenna; the first antenna and the second antenna are designed with double feeding mouth to mouth; the first antenna uses inductive feeding, the second antenna uses capacitive feeding, the third antenna uses capacitive feeding, and the fourth antenna uses capacitive feeding or inductive feeding.

Description

Technical Field

[0001] This application relates to the field of antennas, and particularly to an antenna and a terminal device. Background Art

[0002] The existing antenna solution is a mouth-to-mouth dual-feed solution, and the feeding form is capacitive feeding. As Figure 1 shown, it is a design schematic diagram of an antenna solution in an implementation manner. The matching circuit of ANT (antenna) 1' needs to achieve isolation of ANT2' in wireless fidelity (WiFi) 2.4G, WiFi5G, and Global Positioning System (GPS) L1, and also needs to achieve impedance tuning of its own operating frequency band GPS L5. Particularly, there is a multiplexing relationship between circuits such as C1', L1', and C3' in terms of isolation and tuning. The band-stop circuit composed of L1', C1', and C2' in the matching circuit of ANT2' mainly plays the role of impedance tuning to meet the segmented tuning of WiFi2.4G and WiFi5G. However, the utilization rate of the antenna aperture space is low, the antenna occupies a large space, and it is not conducive to the stacking of the whole machine. Summary of the Invention

[0003] Embodiments of this application provide an antenna and a terminal device, which are used to improve the utilization rate of the antenna aperture on the premise of keeping the number of antennas unchanged, effectively save the internal space of the terminal device, and are conducive to better stacking of the whole machine.

[0004] The first aspect of this application provides an antenna, which may include:

[0005] A first antenna, a second antenna, a third antenna, and a fourth antenna;

[0006] The first antenna and the second antenna are designed with mouth-to-mouth dual-feed;

[0007] The first antenna uses inductive feeding, the second antenna uses capacitive feeding, the third antenna uses capacitive feeding, and the fourth antenna uses capacitive feeding or inductive feeding.

[0008] The second aspect of this application provides a terminal device, which may include the antenna described in the first aspect.

[0009] From the above technical solutions, it can be seen that the embodiments of this application have the following advantages:

[0010] In an embodiment of the present application, the provided antenna may include: a first antenna, a second antenna, a third antenna, and a fourth antenna; the first antenna and the second antenna are designed with double feeds mouth-to-mouth; the first antenna uses inductive feeding, the second antenna uses capacitive feeding, the third antenna uses capacitive feeding, and the fourth antenna uses capacitive feeding or inductive feeding. On the premise that the number of antennas remains unchanged, the utilization rate of the antenna aperture is improved, the internal space of the terminal device is effectively saved, and it is beneficial to better stack the whole machine. Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments and the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings.

[0012] Figure 1 A design schematic diagram of the antenna solution in one implementation manner;

[0013] Figure 2A A schematic diagram of the ANT1' matching circuit in one implementation manner;

[0014] Figure 2B A schematic diagram of the ANT2' matching circuit in one implementation manner;

[0015] Figure 3 A design schematic diagram of the antenna solution in the present application;

[0016] Figure 4A A schematic diagram of the ANT1 matching circuit in the embodiment of the present application;

[0017] Figure 4B A schematic diagram showing the influence of the change of the ANT1 shunt inductance on the radiation efficiency of ANT2 in the embodiment of the present application;

[0018] Figure 4C A schematic diagram showing the influence of the change of the ANT1 shunt inductance on the ANT1 / 2 isolation in the embodiment of the present application;

[0019] Figure 5A A schematic diagram of the ANT2 matching circuit in the embodiment of the present application;

[0020] Figure 5B A schematic diagram showing the influence of the change of the ANT2 shunt capacitance on the ANT1 S11 in the embodiment of the present application;

[0021] Figure 5C A schematic diagram showing the influence of the change of the ANT2 shunt capacitance on the ANT1 WiFi5G radiation efficiency in the embodiment of the present application;

[0022] Figure 5D It is a schematic diagram of the influence of the change of the ANT2 parallel capacitance on the WiFi5G isolation degree in the embodiment of the present application;

[0023] Figure 6A It is a schematic diagram of the influence of ANT3 / 4 on the efficiency of ANT1 in WiFi5G in the embodiment of the present application;

[0024] Figure 6B It is a schematic diagram of the influence of the change of the ANT3 parallel capacitance and the distance from the feeding point to the end on the efficiency of ANT1 in WiFi5G in the embodiment of the present application;

[0025] Figure 6C It is a schematic diagram of the change curve of ANT1 S1 after the parallel capacitance is connected to the ANT3 port in the embodiment of the present application. Detailed implementation manners

[0026] The embodiment of the present application provides an antenna and a terminal device, which improve the utilization rate of the antenna aperture on the premise of keeping the number of antennas unchanged, effectively save the internal space of the terminal device, and are beneficial to better stacking of the whole machine.

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All embodiments based on the embodiments of the present application should fall within the protection scope of the present application.

[0028] The following will describe Figure 1 the frequency bands covered by each antenna shown below:

[0029] The left-handed circular mode (CRLH) from the feeding point of ANT (antenna) 1' to the ground only covers the Global Positioning System (GPS) L5.

[0030] The CRLH mode from the feeding point of ANT2' to the ground covers GPS L1, the quarter-wavelength mode from the ground to the end covers wireless fidelity (WiFi) 2.4G, and the three-quarter-wavelength mode from the ground to the end and the quarter-wavelength mode from the feeding point to the end cover WiFi5G.

[0031] ANT3' covers N79, and covers the middle high band (MHB) and N78 through switching. Among them, MHB is the inverted F antenna (IFA) mode, N78 is the quarter-wavelength mode from the switch to the end, and N79 is the three-quarter-wavelength mode from the ground to the end.

[0032] ANT4' covers B20, WiFi 2.4G, and WiFi 5G. Among them, B20 is the CRLH mode from the location to the end, WiFi 2.4G is the three-quarter wavelength mode from the location to the end, and WiFi 5G is the quarter wavelength mode from the feed point to the end.

[0033] As Figure 2A shown, it is a schematic diagram of the matching circuit of ANT1' in one implementation. As Figure 2B shown, it is a schematic diagram of the matching circuit of ANT2' in one implementation.

[0034] The matching circuit of ANT1' should not only achieve isolation for ANT2 in WiFi 2.4G, WiFi 5G, and GPS L1, but also achieve impedance tuning for its own operating frequency band GPS L5. In particular, there is a multiplexing relationship between circuits such as C1', L1', and C3' in terms of isolation and tuning.

[0035] In the matching circuit of ANT2', the band-stop circuit composed of L5' and C5', C6' mainly plays the role of impedance tuning to meet the segmented tuning of WiFi 2.4G and WiFi 5G.

[0036] However, the space utilization rate of the antenna aperture is low, the antenna occupies a large space, which is not conducive to the stacking of the whole machine; the scheme cannot support the stacking design of the side game mode antenna.

[0037] Next, the technical solution of the present application will be further described by way of embodiments. As Figure 3 shown, it is a design schematic diagram of the antenna scheme in the present application.

[0038] The first antenna (ANT1, also referred to as antenna 1), the second antenna (ANT2, also referred to as antenna 2), the third antenna (ANT3, also referred to as antenna 3), and the fourth antenna (ANT4, also referred to as antenna 4);

[0039] The first antenna (ANT1) and the second antenna (ANT2) are designed with double feeds mouth-to-mouth;

[0040] The first antenna (ANT1) uses inductive feeding, the second antenna (ANT2) uses capacitive feeding, the third antenna (ANT3) uses capacitive feeding, and the fourth antenna (ANT4) uses capacitive feeding or inductive feeding.

[0041] The technical solution of the present application adopts a frequency band splitting scheme to fully release the potential of antenna 1 and antenna 2. It is designed with a double feed mouth-to-mouth scheme. Among them, ANT1 uses inductive feeding, ANT2 uses capacitive feeding, ANT3 uses capacitive feeding, and ANT4 can use capacitive feeding or inductive feeding.

[0042] Optionally, the first antenna (ANT1) covers the WiFi 5G, N78, and WiFi 2.4G frequency bands;

[0043] The second antenna (ANT2) covers the WiFi 5G, N78, WiFi 2.4G, and GPS L1 frequency bands.

[0044] Optionally, the quarter - wavelength mode from the feed point to the end of the first antenna (ANT1) covers WiFi 5G, the quarter - wavelength mode from the end to the location covers N78, and the quarter - parasitic mode covers WiFi 2.4G.

[0045] Optionally, the high - order parasitic mode of the second antenna (ANT2) covers WiFi 5G, the quarter - wavelength mode from the feed point to the end covers N78 and WiFi 2.4G, and the quarter - wavelength mode from the location to the end covers GPS L1.

[0046] It can be understood that in this application, WiFi 5G can also be written as 5GWiFi; WiFi 2.4G can also be written as 2.4GWiFi.

[0047] Optionally, the third antenna (ANT3) covers the GPS L5, N78, and N79 frequency bands;

[0048] The fourth antenna (ANT4) covers the game mode, B3, N41, N78, and N79 frequency bands.

[0049] Optionally, the left - handed loop mode CRLH from the location to the end of the third antenna (ANT3) covers GPS L5, and the high - order parasitic mode covers N78 and N79.

[0050] Optionally, the IFA and parasitic mode of the fourth antenna (ANT4) cover the game mode, B3, and B41, and the high - order parasitic mode covers N78 and N79.

[0051] That is, it can be understood that the quarter - wavelength mode from the feed point to the end of ANT1 and the high - order parasitic mode of ANT2 cover WiFi 5G. The quarter - wavelength mode from the end of ANT1 to the location and the quarter - wavelength mode from the feed point to the end of ANT2 cover N78.

[0052] The quarter - wavelength mode from the location to the end of ANT2 covers GPS L1, and the quarter - wavelength mode from the feed point to the end and the quarter - parasitic mode of ANT1 cover WiFi 2.4G.

[0053] The CRLH coverage from the ANT3 location to the end covers GPS L5. Particularly, the quarter-wavelength mode excitation from the ANT3 end to the feed point can solve the compatibility problems of the higher-order modes of ANT3 and ANT4 and the WiFi 5G mode of ANT1.

[0054] ANT4 is in the IFA + parasitic mode to cover the game mode, B3 + B41, and the higher-order modes of ANT3 and ANT4 cover N78 and N79.

[0055] In the embodiment of the present application, on the premise of keeping the number of antennas unchanged, the utilization rate of the antenna aperture is improved, effectively saving the internal space of the mobile phone, which is beneficial to better stacking of the whole machine. Further, the design of the game mode antenna is realized, and at the same time, the influence of the higher-order mode of the side antenna on WiFi 5G is effectively solved.

[0056] The current flow directions of several frequency bands can be described as follows:

[0057] (1) The current flow direction of GPS L1 is mainly from the ANT2 location to the end.

[0058] (2) The current flow direction of WiFi 2.4G is mainly from the ANT2 feed point to the end and from the ANT1 end to the location; the currents of ANT1 and ANT2 are in the same direction.

[0059] (3) The current flow direction of N78 is mainly from the ANT1 end to the location and from the ANT2 end to the feed point; the currents of ANT1 and ANT2 are in the same direction.

[0060] (4) The current flow direction of WiFi 5G is mainly from the ANT1 feed point to the end and from the ANT2 feed point to the end. The currents of ANT1 and ANT2 are in the same direction.

[0061] Optionally, the first matching circuit corresponding to the first antenna (ANT1) includes: a first isolation circuit and a first tuning circuit;

[0062] The first isolation circuit is used to isolate near field communication (NFC), isolate GPS L1 of the second antenna (ANT2), and isolate the first antenna (ANT1) and the second antenna (ANT2) in WiFi 2.4G;

[0063] The first tuning circuit is used to tune the frequency bands covered by the first antenna (ANT1).

[0064] It can be understood that the first isolation circuit can also tune some frequency bands covered by the first antenna (ANT1).

[0065] Optionally, the first isolation circuit includes: a first capacitor, a second capacitor, a first inductor, and a second inductor;

[0066] One end of the first capacitor is connected to the first antenna (ANT1), and the other end is connected to the first inductor. The other end of the first inductor is grounded;

[0067] The first capacitor is used to isolate near field communication (NFC);

[0068] The first inductor is used to isolate the GPS L1 of the second antenna (ANT2);

[0069] The second capacitor is connected in parallel with the second inductor and is used to isolate the first antenna (ANT1) and the second antenna (ANT2) in the WiFi 2.4G band.

[0070] It should be noted that the first capacitor and the second capacitor can be obtained by connecting multiple capacitors in series or in parallel. The first inductor and the second inductor can also be obtained by connecting multiple inductors in series or in parallel. No specific limitation is made here.

[0071] It can be understood that for the mouth-to-mouth dual-feed design antenna form, the circuit design should take into account the mode compatibility problem, the port isolation problem, and the impedance matching problem. There is a certain reuse relationship among the three in the LC circuit. In particular, the role of the first LC at port 1 not only can adjust the parasitic mode on port 2 at the field level, but also has an important impact on the isolation of the operating frequency bands of port 1 and port 2 and the impedance tuning of the operating frequency band of port 1 at the circuit level.

[0072] Exemplarily, as Figure 4A shown, it is a schematic diagram of the ANT1 matching circuit in the embodiment of the present application. As shown in Figure 4A , C1 mainly realizes the isolation effect on NFC, and has an equivalent through state for the operating frequency band of this ANT1, with no obvious influence. The shunt inductor L1 can adjust the mode for ANT2 to solve the influence of the loop mode on WiFi 2.4G, and for ANT1, it also solves the isolation problem of the GPS L1 of ANT2 at the same time. The main function of the band-stop circuit L2 / C2 is to solve the isolation problem of ANT1 and ANT2 in the WiFi 2.4G band. Here, its stop-band effect is mainly utilized. Since the two ends of the stop band show different reactance characteristics for different frequencies, this circuit has a certain influence on the tuning of the operating frequency band of ANT1, and the selection of L2 / C2 should be appropriate.

[0073] It can be understood that the circuit composed of C1, L1, C2, and L2 can be called an isolation circuit. The circuit composed of L3, C3, and C4 can be called a tuning circuit, which has a certain influence on the tuning of the operating frequency band of ANT1.

[0074] As Figure 4B shown, it is a schematic diagram of the influence of the change of the shunt inductor of ANT1 on the radiation efficiency of ANT2 in the embodiment of the present application. In Figure 4B the shown figure, adding the shunt inductor L1 to ANT1 can adjust the parasitic loop mode generated with ANT2 to outside the WiFi 2.4G high-frequency band in the field layer, reducing the influence on the efficiency of WiFi 2.4G.

[0075] As Figure 4C shown, it is a schematic diagram of the influence of the change of the shunt inductor of ANT1 on the isolation degree between ANT1 / 2 in the embodiment of the present application. In Figure 4C the shown figure, adding the shunt inductor L1 to ANT1 can improve the isolation degree between the ANT1 port and the ANT2 port at GPS L1 in the circuit layer.

[0076] Optionally, the second matching circuit corresponding to the second antenna (ANT2) includes: a second isolation circuit and a second tuning circuit;

[0077] The second isolation circuit is used to excite N78 of the first antenna (ANT1), isolate the second antenna (ANT2) and the first antenna (ANT1) at WiFi 5G, and isolate the second antenna (ANT2) and the first antenna (ANT1) at N78;

[0078] The second tuning circuit is used to tune the frequency band covered by the second antenna (ANT2).

[0079] It can be understood that the second isolation circuit can also tune some frequency bands covered by the second antenna (ANT2).

[0080] Optionally, the second isolation circuit includes: a third capacitor, a fourth capacitor, and a third inductor;

[0081] One end of the third capacitor is connected to the second antenna (ANT2), and the other end is grounded. The third capacitor is used to excite N78 of the first antenna (ANT1) and isolate the second antenna (ANT2) and the first antenna (ANT1) at WiFi 5G;

[0082] The fourth capacitor and the third inductor are connected in parallel and are used to isolate the second antenna (ANT2) and the first antenna (ANT1) at WiFi 5G.

[0083] It should be noted that the third capacitor and the fourth capacitor can be obtained by connecting multiple capacitors in series or in parallel, and the third inductor can also be obtained by connecting multiple inductors in series or in parallel. No specific limitation is made here.

[0084] Exemplarily, as Figure 5A shown, it is a schematic diagram of the ANT2 matching circuit in an embodiment of the present application. In Figure 5A the shown figure, the shunt capacitor C5 completes the excitation of N78 of ANT1 while solving the isolation problem between ANT2 in WiFi5G and ANT1, realizing multiplexing. The function of the band-stop circuit L5 / C7 is mainly to realize the isolation problem between ANT2 and ANT1 in N78. Since the stop band is in N78, it has an equivalent inductance for WiFi2.4G and GPS L1, and realizes multiplexing for the tuning of WiFi2.4G.

[0085] It can be understood that the circuit composed of C5, C7, and L5 can be called an isolation circuit. The circuit composed of L4, C6, and C8 can be called a tuning circuit, which has a certain influence on the tuning of the operating frequency band of ANT2.

[0086] As Figure 5B shown, it is a schematic diagram of the influence of the change of the ANT2 shunt capacitor on the S11 of ANT1 in an embodiment of the present application. In Figure 5B the shown figure, the change of the value of the first shunt capacitor C5 at the input end of ANT2 can realize the excitation of N78 of ANT1.

[0087] As Figure 5C shown, it is a schematic diagram of the influence of the change of the ANT2 shunt capacitor on the radiation efficiency of ANT1 in WiFi5G in an embodiment of the present application. In Figure 5C the shown figure, the parallel capacitor C5 of ANT2 can tune the high-order mode to the out-of-band in the field plane to improve the WiFi5G efficiency, for example, by 2 dB.

[0088] As Figure 5D shown, it is a schematic diagram of the influence of the change of the ANT2 shunt capacitor on the WiFi5G isolation degree in an embodiment of the present application. In Figure 5D the shown figure, adding the shunt capacitor C5 to ANT2 can improve the isolation degree between the port of ANT2 and ANT1 in WiFi5G to, for example, below -20 dB at the circuit level.

[0089] As Figure 6A shown, it is a schematic diagram of the influence of ANT3 / 4 on the efficiency of ANT1 in WiFi5G in an embodiment of the present application. In Figure 6A the shown figure, the high-order mode generated by ANT3 will fall into the WiFi5G band of ANT1, affecting the efficiency, for example, by 2 dB.

[0090] As Figure 6BAs shown, it is a schematic diagram of the influence of the parallel capacitance of ANT3 and the change of the distance from the feeding point to the end on the efficiency of ANT1 WiFi 5G in the embodiment of the present application. In Figure 6B As shown, adding a parallel capacitance to the input end of ANT3 can excite the quarter mode from the feeding point to the end to improve the influence of the high-order loop mode in the band, and the radiation efficiency is increased by, for example, 2 dB.

[0091] As Figure 6C shown, it is a schematic diagram of the change curve of ANT1 S1 after the parallel capacitance at the ANT3 port in the embodiment of the present application. In Figure 6C As shown, adding a parallel capacitance to the ANT3 port results in a new resonance at 6 GHz when viewed from the input end of antenna 1.

[0092] It can be understood that when the parallel capacitance is not added to the matching circuit corresponding to ANT3, it is the high-order mode from the location to the end and WiFi 5G; after the parallel capacitance is added to the matching circuit corresponding to ANT3, it is the quarter fundamental mode from the feeding point to the end.

[0093] From the efficiency curve and current distribution, it can be seen that the high-order mode of ANT3 will fall into the WiFi 5G band and affect the efficiency by, for example, 2 dB. After adding a small capacitance to ANT3, the quarter-wavelength mode fed to the end can be excited, forming a co-directional current with WiFi 5G, solving the mode compatibility problem between the high-order mode of ANT3 and the WiFi 5G of ANT1.

[0094] The present application adopts a frequency band splitting scheme, improving the utilization rate of the antenna aperture. The influence of the high-order mode generated by the game mode antenna on the WiFi 5G of antenna 1 is solved by exciting the fundamental mode from the end to the feeding point of ANT3, realizing the compatibility design of the mode, and providing good reference significance for subsequent projects. A systematic analysis and summary of the multiplexing relationship between mode adjustment, isolation, and tuning of the LC circuit in the mouth-to-mouth multi-feed antenna scheme is carried out.

[0095] Optionally, the design schemes of the game mode antenna and the small antenna can be continuously iterated in subsequent projects to continuously optimize the performance and improve the user experience. In addition, the mode compatibility design between multiple antennas can be solved by constructing the fundamental mode. The multiplexing principle of the LC circuit between mode adjustment, isolation, and tuning in the mouth-to-mouth multi-feed antenna scheme provides a normalized theoretical guidance for the optimized design of subsequent multi-feed antenna schemes.

[0096] The present application also includes a terminal device, which may include an antenna as Figure 3 shown.

[0097] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0098] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0099] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0100] In addition, in each embodiment of the present application, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0101] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0102] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present application.

Claims

1. An antenna, characterized in that, Including: The first antenna, the second antenna, the third antenna and the fourth antenna; The first antenna and the second antenna are designed with mouth-to-mouth dual-feed; The first antenna uses inductive feeding, the second antenna uses capacitive feeding, the third antenna uses capacitive feeding, and the fourth antenna uses capacitive feeding or inductive feeding; The first antenna covers WiFi 5G, N78 and WiFi 2.4G; The quarter-wavelength mode from the feed point to the end of the first antenna covers WiFi 5G, the quarter-wavelength mode from the end to the location covers N78, and the quarter parasitic mode covers WiFi 2.4G; The second antenna covers WiFi 5G, N78, WiFi 2.4G and GPS L1; The high-order parasitic mode of the second antenna covers WiFi 5G, the quarter-wavelength mode from the feed point to the end covers N78 and WiFi 2.4G, and the quarter-wavelength mode from the location to the end covers GPS L1; The first matching circuit corresponding to the first antenna includes: a first isolation circuit and a first tuning circuit; The first isolation circuit is used to isolate near field communication (NFC), isolate the GPS L1 of the second antenna, and isolate the first antenna and the second antenna in WiFi 2.4G; The first tuning circuit is used to tune the frequency bands covered by the first antenna.

2. The antenna according to claim 1, wherein The third antenna covers GPS L5, N78 and N79; The fourth antenna covers the game mode, B3, N41, N78 and N79.

3. The antenna according to claim 2, characterized in that, The left-handed loop mode CRLH from the location to the end of the third antenna covers GPS L5, and the high-order parasitic mode covers N78 and N79.

4. The antenna according to claim 2, wherein The IFA and parasitic mode of the fourth antenna cover the game mode, B3 and N41, and the high-order parasitic mode covers N78 and N79.

5. The antenna according to claim 1, characterized in that, The first isolation circuit includes: a first capacitor, a second capacitor, a first inductor and a second inductor; One end of the first capacitor is connected to the first antenna, the other end is connected to the first inductor, and the other end of the first inductor is grounded; The first capacitor is used to isolate near field communication (NFC); The first inductor is used to isolate the GPS L1 of the second antenna; The second capacitor is connected in parallel with the second inductor and is used to isolate the first antenna and the second antenna in WiFi 2.4G.

6. The antenna according to claim 1, characterized in that, The second matching circuit corresponding to the second antenna includes: a second isolation circuit and a second tuning circuit; The second isolation circuit is used to excite the N78 of the first antenna, isolate the first antenna and the second antenna in WiFi 5G, and isolate the first antenna and the second antenna in N78; The second tuning circuit is used to tune the frequency bands covered by the second antenna.

7. The antenna according to claim 6, wherein The second isolation circuit includes: A third capacitor, a fourth capacitor and a third inductor; One end of the third capacitor is connected to the second antenna, and the other end is grounded. The third capacitor is used to excite N78 of the first antenna and isolate the second antenna and the first antenna in WiFi 5G. The fourth capacitor and the third inductor are connected in parallel and are used to isolate the second antenna and the first antenna in WiFi 5G.

8. A terminal device, characterized in that, It includes the antenna according to any one of claims 1-7.

Images