A high isolation terminal antenna system

Abstract

The embodiment of the application discloses a terminal antenna system with high isolation, relates to the technical field of antennas, and can provide better isolation and better radiation performance. The specific scheme is as follows: the terminal antenna system comprises a first antenna pair, the first antenna pair comprises a first antenna and a second antenna, the first antenna and the second antenna are current loop antennas, or the first antenna and the second antenna are magnetic current loop antennas. The feed port of the first antenna is a first port, the feed port of the second antenna is a second port, and the feed signals fed into the first port and the second port simultaneously comprise symmetric feed signals and antisymmetric feed signals.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, and in particular to a terminal antenna system with high isolation. BACKGROUND

[0002] In electronic devices, multiple antennas can be provided to support the increasingly high wireless communication requirements of electronic devices. When multiple antennas are working simultaneously, they can interfere with each other, thereby affecting the overall radiation performance. By improving the isolation between antennas, the influence during the operation of multiple antennas can be effectively improved. SUMMARY

[0003] The terminal antenna system with high isolation provided by the embodiments of the present application provides a working mode of an antenna system based on different feeding forms. The antenna pair in the antenna system can excite orthogonal currents on the floor due to different feeding modes, and can also generate orthogonal spatial field distributions, and therefore has good isolation. In addition, the antenna system includes a current loop antenna and / or a magnetic current loop antenna, and therefore can obtain good radiation performance in a limited space, such as better bandwidth, radiation efficiency, system efficiency, lower SAR, and better directional diagram.

[0004] To achieve the above object, the embodiments of the present application adopt the following technical solutions:

[0005] In a first aspect, a terminal antenna system with high isolation is provided, and is applied to an electronic device. The terminal antenna system includes a first antenna pair, the first antenna pair includes a first antenna and a second antenna, and the first antenna and the second antenna are both current loop antennas, or the first antenna and the second antenna are both magnetic current loop antennas. A feeding port of the first antenna is a first port, a feeding port of the second antenna is a second port, and feeding signals fed into the first port and the second port include symmetric feeding signals and anti-symmetric feeding signals.

[0006] Based on the scheme, a scheme of an antenna system with high isolation characteristics is provided. In the present example, the antenna system can include at least one antenna pair (such as the first antenna pair), and the first antenna pair can be composed of two antennas. The two antennas in the first antenna pair can be current loop antennas or magnetic current loop antennas. When the two antennas of the first antenna pair work in a symmetric feeding state under the excitation of symmetric feeding, and the two antennas of the first antenna pair work in an anti-symmetric feeding state under the excitation of anti-symmetric feeding, due to the high isolation characteristics of the two states, the two high-isolation working characteristics are obtained when symmetric feeding and anti-symmetric feeding are performed on the first antenna pair at the same time, thereby obtaining high isolation. Based on the scheme,

[0007] In a possible design, when the feeding signals fed into the first port and the second port are symmetric feeding signals, the first antenna pair operates in a symmetric feeding state. When the feeding signals fed into the first port and the second port are anti-symmetric feeding signals, the first antenna pair operates in an anti-symmetric feeding state. The current direction for exciting the ground plane in the symmetric feeding state is a first direction, and the current direction for exciting the ground plane in the anti-symmetric feeding state is a second direction, the first direction and the second direction being orthogonal. Based on this scheme, a specific definition of high isolation characteristics in two feeding states is provided. For example, in the two states, a transverse current and a longitudinal current on the ground plane can be excited respectively, and due to the orthogonality of the excited ground plane current, high isolation characteristics in the two feeding states are obtained.

[0008] In a possible design, the symmetric feeding signals and the anti-symmetric feeding signals are equal-amplitude anti-phase feeding signals. Based on this scheme, a specific example of symmetric feeding signals and anti-symmetric feeding signals is provided. For example, when symmetric feeding excitation is performed, the feeding signals input into the two antenna ports can be equal-amplitude in-phase signals. When anti-symmetric feeding excitation is performed, the feeding signals input into the two antenna ports can be equal-amplitude anti-phase signals. In this example, to obtain two orthogonal operating states, symmetric feeding and anti-symmetric feeding can be used to feed the first antenna pair at the same time.

[0009] In a possible design, the structures of the first antenna and the second antenna are mirror-symmetric. Based on this scheme, a structure definition of the first antenna and the second antenna is provided. For example, the first antenna and the second antenna can be arranged symmetrically with respect to each other on the electronic device, and / or the structures of the first antenna and the second antenna, such as feeding structures, radiation structures and the like, can also have the feature of mutual symmetry.

[0010] In a possible design, the first antenna and the second antenna are in a straight feeding form, or the first antenna and the second antenna are in a coupled feeding form. Based on this scheme, an example of a feeding form of a high-isolation antenna pair is provided.

[0011] In a possible design, when the first antenna and the second antenna are both in a straight feeding form, the feeding ports of the first antenna and the second antenna are arranged at antenna radiator ends close to each other or at antenna radiator ends far away from each other. Based on this scheme, a feeding point arrangement definition in a straight feeding case of a high-isolation antenna pair is provided. For example, the two feeding points can be arranged close to each other, and for another example, the two feeding points can be arranged far away from each other.

[0012] In a possible design, the first antenna and the second antenna are arranged at a same side of the electronic device, when both the first antenna and the second antenna are straight feed, a feed point of the first antenna is arranged at a left end of a radiator of the first antenna, and a feed point of the second antenna is arranged at a left end of a radiator of the second antenna. Alternatively, the feed point of the first antenna is arranged at a right end of the radiator of the first antenna, and the feed point of the second antenna is arranged at a right end of the radiator of the second antenna. Alternatively, the feed point of the first antenna is arranged at an upper end of the radiator of the first antenna, and the feed point of the second antenna is arranged at an upper end of the radiator of the second antenna. Alternatively, the feed point of the first antenna is arranged at a lower end of the radiator of the first antenna, and the feed point of the second antenna is arranged at a lower end of the radiator of the second antenna. Based on this scheme, another example of arrangement of the feed point in the straight feed case is provided. For example, when the two antennas are at the top edge or the bottom edge, the feed points can be arranged at the left side of the two radiators, or at the right side. When the two antennas are at the side edge, the feed points can be arranged at the upper side of the two radiators, or at the lower side.

[0013] In a possible design, when both the first antenna and the second antenna are current loop antennas with coupled feed, the first antenna includes a first radiating branch, and a first feed branch configured to feed the first radiating branch in a coupled manner, and at least one end of the first radiating branch is grounded in a capacitive manner. Based on this scheme, a limitation on the antenna itself is provided when the current loop antennas with coupled feed are used. In some embodiments, the second antenna can also have the same structural features as the first antenna.

[0014] In a possible design, when both the first antenna and the second antenna are magnetic current loop antennas with coupled feed, the first antenna includes a second radiating branch, and a second feed branch configured to feed the second radiating branch in a coupled manner, and at least one end of the second radiating branch is grounded in an inductive manner. Based on this scheme, a limitation on the antenna itself is provided when the magnetic current loop antennas with coupled feed are used. In some embodiments, the second antenna can also have the same structural features as the first antenna.

[0015] In a possible design, the first antenna and the second antenna are both current loop antennas, and a radiator of the current loop antenna is connected in parallel with at least one first capacitor to ground. Alternatively, the first antenna and the second antenna are both current loop slot antennas, and a radiator of the current loop slot antenna is connected in series with at least one second capacitor. Based on this scheme, an example of a specific current loop antenna is provided. By connecting a capacitor in parallel on a wire antenna, or connecting a capacitor in series on a slot antenna, a uniform magnetic field distribution can be obtained, thereby obtaining the distribution characteristics of a current loop antenna. In this example, the first antenna and the second antenna can be the same type of current loop antenna, or different types of current loop antennas.

[0016] In a possible design, the first antenna and the second antenna are of the same antenna form, and the antenna form includes any one of the following: a current loop monopole antenna, a current loop dipole antenna, a current loop left-handed antenna, and a current loop slot antenna. Based on this scheme, several examples of specific current loop antennas are provided.

[0017] In a possible design, the first antenna and the second antenna are both magnetic loop antennas, and a radiator of the magnetic loop antenna is connected in parallel with at least one first inductor to ground. Alternatively, the first antenna and the second antenna are both magnetic loop slot antennas, and a radiator of the magnetic loop slot antenna is connected in series with at least one second inductor. Based on this scheme, an example of a specific magnetic loop antenna is provided. By connecting an inductor in parallel on a wire antenna, or connecting an inductor in series on a slot antenna, a uniform electric field distribution can be obtained, thereby obtaining the distribution characteristics of a magnetic loop antenna. In this example, the first antenna and the second antenna can be the same type of magnetic loop antenna, or different types of magnetic loop antennas.

[0018] In a possible design, the first antenna and the second antenna are of the same antenna form, and the antenna form includes any one of the following: a magnetic loop monopole antenna, a magnetic loop dipole antenna, a magnetic loop left-handed antenna, and a magnetic loop slot antenna. Based on this scheme, several examples of specific magnetic loop antennas are provided.

[0019] In a second aspect, an electronic device is provided, which includes at least one processor, a radio frequency module, and the terminal antenna system as described in the first aspect and any possible design thereof. The electronic device performs signal transmission or reception by using the radio frequency module and the terminal antenna system.

[0020] It should be understood that the technical features of the technical scheme provided in the second aspect above can correspond to the technical scheme provided in the first aspect and any possible design thereof, and thus the beneficial effects that can be achieved are similar, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of a multi-antenna working scenario;

[0022] Figure 2 is a schematic diagram of an electronic device provided by an embodiment of the present application;

[0023] Figure 3 is a schematic diagram of a metal shell provided by an embodiment of the present application;

[0024] Figure 4 is a schematic diagram of an electronic device provided by an embodiment of the present application;

[0025] Figure 5 is a schematic diagram of working of a current loop antenna provided by an embodiment of the present application;

[0026] Figure 6 is a schematic diagram of specific implementation of a current loop antenna provided by an embodiment of the present application;

[0027] Figure 7 is a schematic diagram of a current loop antenna with coupled feed provided by an embodiment of the present application;

[0028] Figure 8 is a schematic diagram of working of a magnetic current loop antenna provided by an embodiment of the present application;

[0029] Figure 9 is a schematic diagram of specific implementation of a magnetic current loop antenna provided by an embodiment of the present application;

[0030] Figure 10 is a schematic diagram of a magnetic current loop antenna with coupled feed provided by an embodiment of the present application;

[0031] Figure 11 is a schematic diagram of anti-symmetrical feed provided by an embodiment of the present application;

[0032] Figure 12 is a schematic diagram of a high-isolation antenna pair composed of current loop antennas provided by an embodiment of the present application;

[0033] Figure 13 is a schematic diagram of different feed states provided by an embodiment of the present application;

[0034] Figure 14 is a comparative schematic diagram of current distribution provided by an embodiment of the present application;

[0035] Figure 15 is a comparative schematic diagram of floor electric field distribution provided by an embodiment of the present application;

[0036] Figure 16 is a comparative schematic diagram of far field pattern provided by an embodiment of the present application;

[0037] Figure 17 A simulation diagram of S parameters provided for an embodiment of the present application;

[0038] Figure 18A A simulation diagram of efficiency provided for an embodiment of the present application;

[0039] Figure 18B A diagram of a high-isolation antenna pair of current loop antennas provided for an embodiment of the present application;

[0040] Figure 19 A diagram of a high-isolation antenna pair of magnetic current loop antennas provided for an embodiment of the present application;

[0041] Figure 20 A diagram of different feed states provided for an embodiment of the present application;

[0042] Figure 21 A diagram of comparison of magnetic current distribution provided for an embodiment of the present application;

[0043] Figure 22 A diagram of comparison of floor electric field distribution provided for an embodiment of the present application;

[0044] Figure 23 A diagram of comparison of far field pattern provided for an embodiment of the present application;

[0045] Figure 24 A simulation diagram of S parameters provided for an embodiment of the present application;

[0046] Figure 25A A simulation diagram of efficiency provided for an embodiment of the present application;

[0047] Figure 25B A diagram of a high-isolation antenna pair of magnetic current loop antennas provided for an embodiment of the present application;

[0048] Figure 26 A diagram of an antenna pair of existing left-handed antennas provided for an embodiment of the present application;

[0049] Figure 27 A diagram of comparison of patterns of a left-handed antenna pair provided for an embodiment of the present application;

[0050] Figure 28 A diagram of an antenna pair of existing IFA antennas provided for an embodiment of the present application;

[0051] Figure 29 A diagram of comparison of patterns of an IFA antenna pair provided for an embodiment of the present application;

[0052] Figure 30A schematic diagram of an antenna pair formed by an existing ILA antenna is provided for an embodiment of the present application.

[0053] Figure 31 A comparison diagram of the directional pattern of an ILA antenna pair is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0054] With the development of wireless communication technology, multiple antennas are usually required to be arranged in an electronic device to meet the requirements of the wireless communication function of the electronic device. The working frequency bands of some antennas can partially or completely overlap, thereby improving the communication capability of the corresponding frequency bands.

[0055] For example, in combination with Figure 1 For example, in combination with

[0056] It can be understood that, since the working frequency bands of E1 and E2 are the same, the signal emitted by E1 can be included in the signal received by E2. This part of the signal is obviously not needed to be received by the electronic device, and thus this part of the signal can be an invalid signal for the work of E2. That is, when E1 and E2 work at the same time, the mutual influence between the two antennas can occur, thereby reducing the wireless communication efficiency of the antennas.

[0057] In the above example, the scenario of E1 emission and E2 reception is taken as an example, and in other scenarios, similar problems can also exist, which reduces the wireless communication efficiency of the antennas. For example, in the scenario of E1 reception and E2 emission, the same problem can also occur due to similar mechanisms. In addition, when the working frequency bands of E1 and E2 are different, for example, when the working frequency band of E1 is lower than that of E2, although the working frequency band of E1 does not overlap with that of E2, the corresponding resonance frequency of E1 can also affect the work of E2.

[0058] To solve the problem of mutual influence in the multi-antenna scenario, the influence between antennas can be reduced by improving the isolation between antennas. The better the isolation between antennas, the smaller the mutual influence between antennas. The isolation can be identified by a normalized value. For example, taking the two-port isolation as an example, the isolation can be identified by S21 (or S12) in the S parameter, and the value of S21 at different frequency points corresponds to the isolation of the two-port at the current frequency point. After normalization, the maximum value of the isolation is not more than 0, and the greater the absolute value of the isolation, the better the isolation and the smaller the influence between antennas. Correspondingly, the smaller the absolute value of the isolation, the worse the isolation and the greater the influence between antennas. For ease of illustration, in the following examples, the absolute value of the isolation is simply referred to as the isolation. For example, the absolute value of the isolation is large, which is simply referred to as the isolation is large. For example, the absolute value of the isolation is small, which is simply referred to as the isolation is small.

[0059] It should be understood that the strength of the antenna radiation performance will also affect the isolation between antennas. Continue to combine the example shown in the above Figure 1 It should be understood that the strength of the antenna radiation performance will also affect the isolation between antennas. Continue to combine the example shown in the above

[0060] To solve the above problems, an embodiment of the present application provides a high-isolation antenna scheme. The scheme can be applied to an antenna system. The antenna system can include a plurality of antennas. At least two of the plurality of antennas can form a high-isolation antenna pair. At least one of the high-isolation antenna pair is a current loop antenna / magnetic current loop antenna. Through the control of the feed form, such as symmetric feed and anti-symmetric feed, the plurality of antennas in the antenna system can include an antenna pair formed by two antennas to form a high-isolation characteristic. For example, the two antennas in the antenna pair can work in two states corresponding to the feed form, such as symmetric feed state and anti-symmetric feed state, and the respective modes in the two states can have a high-isolation characteristic. For another example, the two antennas in the antenna pair can be symmetrically fed, and the high-isolation characteristic can be achieved through the difference in the respective working characteristics of the two antennas. In an embodiment of the present application, when symmetric feed and anti-symmetric feed are performed on two ports at the same time, the symmetric feed signal and the anti-symmetric feed signal are equal-amplitude opposite-phase feed signals, and the two signals are simultaneously fed to the two antennas. For example, taking two ports as an example, port A of antenna A and port B of antenna B. When symmetric feed is performed, the feed signals to port A and port B can have an amplitude X and a phase Y. When anti-symmetric feed is performed, the feed signals to port A and port B can have an amplitude X and a phase -Y.

[0061] It should be noted that the radiation performance involved in the embodiments of the present application can refer to the radiation efficiency and / or system efficiency of the corresponding antenna. The radiation efficiency can be used to identify the maximum radiation capability of the antenna system, and the system efficiency can be used to identify the efficiency that the antenna can provide under the current environment and port matching.

[0062] The following first describes the implementation scenario of the high-isolation antenna scheme provided by the embodiments of the present application.

[0063] The antenna scheme provided by the embodiments of the present application can be applied to a user's electronic device to support the wireless communication function of the electronic device. For example, the electronic device can be a mobile phone, a tablet computer, a personal digital assistant (PDA), an augmented reality (AR) \ virtual reality (VR) device, a media player, and the like. The electronic device can also be a smart watch or other wearable electronic device. The embodiments of the present application do not specially limit the specific form of the device.

[0064] Please refer to Figure 2 , a structural schematic diagram of an electronic device 200 provided by an embodiment of the present application. As shown in Figure 2As shown, the electronic device 200 provided in this application embodiment can be arranged in the following order from top to bottom along the z-axis: screen and cover plate 201, metal housing 202, internal structure 203, and back cover 204.

[0065] The screen and cover plate 201 can be used to realize the display function of the electronic device 200. The metal housing 202 can serve as the main frame of the electronic device 200, providing rigid support for the electronic device 200. The internal structure 203 can include a collection of electronic and mechanical components that realize the various functions of the electronic device 200. For example, the internal structure 203 can include shielding covers, screws, reinforcing ribs, etc. The back cover 204 can be the rear exterior surface of the electronic device 200, and the back cover 204 can be made of glass, ceramic, plastic, etc. in different implementations.

[0066] The antenna solution provided in this application embodiment can be applied to, for example... Figure 2 The illustrated electronic device 200 is used to support its wireless communication function. In some embodiments, the antenna involved in this antenna scheme may be disposed on the metal housing 202 of the electronic device 200. In other embodiments, the antenna involved in this antenna scheme may be disposed on the rear cover 204 of the electronic device 200, etc.

[0067] As an example, taking the metal housing 202 with a metal frame architecture as an example, Figure 3 A schematic diagram of the composition of a metal casing 202 is shown. In this example, the metal casing 202 can be made of a metallic material, such as an aluminum alloy. Figure 3 As shown, a reference ground can be provided on the metal housing 202. This reference ground can be a large-area metal material, used to provide most of the rigid support while providing a zero-potential reference for various electronic components. In... Figure 3 In the example shown, a metal frame may also be provided around the reference ground. This metal frame can be a completely closed metal frame, or it may include a partially or completely suspended metal strip. In other implementations, the metal frame may also be as follows: Figure 3 The image shows a metal frame interrupted by one or more gaps. For example, in... Figure 3 In the example, gaps 1, 2, and 3 can be set at different locations on the metal frame. These gaps can break the metal frame, thereby obtaining independent metal stubs. In some embodiments, some or all of these metal stubs can be used as radiating stubs of an antenna, thereby achieving structural reuse in the antenna setup process and reducing the difficulty of antenna setup. When the metal stubs are used as radiating stubs of an antenna, the positions of the gaps set at one or both ends of the metal stubs can be flexibly selected according to the antenna setup.

[0068] In suchFigure 3 In the example shown, one or more metal pins can also be arranged on the metal frame. In some examples, screw holes can be arranged on the metal pins for fixing other structural members by screws. In other examples, the metal pins can be coupled with the feeding points, so as to feed the antenna through the metal pins when the metal branch connected with the metal pin is used as the radiating branch of the antenna. In other examples, the metal pins can also be coupled with other electronic components to realize corresponding electrical connection functions.

[0069] In the example, the arrangement of the printed circuit board (PCB) on the metal shell is also shown. For example, the main board and the sub board are designed separately. In other examples, the main board and the sub board can also be connected, such as an L-shaped PCB design. In some embodiments of the present application, the main board (such as PCB1) can be used to carry electronic components for realizing various functions of the electronic device 200. For example, a processor, a memory, a radio frequency module, etc. The sub board (such as PCB2) can also be used to carry electronic components. For example, a universal serial bus (USB) interface and related circuits, a speak box, etc. For example, the sub board can also be used to carry the radio frequency circuit corresponding to the antenna arranged at the bottom (i.e. the y-axis negative direction part of the electronic device).

[0070] The antenna scheme provided by the embodiments of the present application can be applied to an electronic device composed of, for example, Figure 2 or Figure 3 as shown.

[0071] It should be noted that the electronic device 200 in the above example is only one possible composition. In other embodiments of the present application, the electronic device 200 can also have other logical compositions. For example, in order to realize the wireless communication function of the electronic device 200, a communication module as shown in Figure 4 may be arranged in the electronic device. The communication module can include an antenna, a radio frequency module for signal interaction with the antenna, and a processor for signal interaction with the radio frequency module. For example, the signal interaction between the radio frequency module and the antenna can be analog signal interaction. The signal interaction between the radio frequency module and the processor can be analog signal or digital signal. In some implementations, the processor can be a baseband processor.

[0072] In the example, the antenna arranged in the electronic device can be a plurality of antennas to form an antenna system. For example, as shown in Figure 4 , the antenna system can include antenna 1 to antenna n. Among the n antennas, one or more magnetic current loop antennas and / or current loop antennas can be included.

[0073] The following first in conjunction with the drawings, a simple description of the magnetic current loop antenna and the current loop antenna.

[0074] Exemplary, the scheme provided by the embodiments of the application involves the current loop antenna, which can be composed of features, so that the antenna has a current and magnetic field distribution as shown in Figure 5 In the embodiments of the application, the radiation characteristics with current distribution and / or magnetic field distribution as shown in Figure 5

[0075] As shown in Figure 5 The current direction on the radiation branch of the current loop antenna can be opposite to the current direction of the floor as the reference ground (such as the floor close to the edge of the current loop antenna). Thus forming a current loop composed of the radiation branch and the floor, and performing radiation with the current loop antenna radiation characteristics. In some embodiments, the above-mentioned current loop radiation characteristics can be obtained by setting series and / or parallel capacitors on the radiation branch. For example, in conjunction with Figure 5 A capacitor or the like can be set at position 1. It should be understood that through the energy storage characteristics of the capacitor for electrical energy, the change of the current on the radiation branch can be made to tend to be gentle, and the magnetic field corresponding to the current can also be made to tend to be gentle in the area near the radiation branch (such as the area between the radiation branch and the reference ground), thereby obtaining a more uniform distribution of the magnetic field. It should be noted that in the embodiments of the application, the capacitor can be a lumped capacitor or a distributed capacitor. In some other embodiments of the application, the function of the capacitor can also be realized in other forms, for example, the function of the capacitor can be realized by setting a structure with the same or similar distributed capacitor value. As a possible implementation, the distributed capacitor structure can be an interdigital structure or the like.

[0076] Through experiments, it is verified that the current loop antenna with uniform magnetic field distribution can provide better radiation performance under the same space conditions. For example, better radiation efficiency, system efficiency, bandwidth, etc.

[0077] As an example, Figure 6 Several possible specific implementations of the current loop antenna are shown. It should be noted that in different implementations of the application, according to the differences in the composition structure of the current loop antenna, the current loop antenna can be divided into current loop wire antennas and current loop slot antennas. Among them, the current loop wire antenna can include a current loop monopole antenna, a current loop dipole antenna, etc. The current loop slot antenna can include a current loop left-handed antenna, a current loop slot antenna, etc.

[0078] On the current loop wire antenna, a parallel first capacitor can be provided, thereby realizing a current and magnetic field distribution as shown in Figure 5 ​The working mechanism is shown in (a) of FIG. 1. In some implementations, one or more capacitors can be further connected in series on the radiator of the current loop line antenna, so as to improve the radiation performance of the current loop line antenna.

[0079] Corresponding to the current loop line antenna, a second capacitor can be arranged in series on the current loop slot antenna, so as to realize the working mechanism as shown in (a) of FIG. 2. Figure 5 In some implementations, more capacitors can be further connected in series on the radiator of the current loop slot antenna, so as to improve the radiation performance of the current loop line antenna.

[0080] Figure 6 (a) of FIG. 1 shows a schematic of a current loop monopole antenna. The current loop monopole antenna can include a radiator B1. In the case where the current loop monopole antenna works in a fundamental mode (such as a 1 / 4 wavelength mode), the length of the radiator B1 can correspond to 1 / 4 of the working wavelength. For example, the length of B1 can be less than 1 / 4 of the working wavelength. One end of B1 can be electrically connected with a feed point, and the other end of B1 can be grounded through a first capacitor (such as capacitor C M1 ).

[0081] Figure 6 (b) of FIG. 1 shows a schematic of a current loop dipole antenna. The current loop dipole antenna can include radiators B2 and B3. B2 and B3 can be connected through a feed point, and one end of B2 away from B3 can be grounded through a capacitor C D1 , and one end of B3 away from B2 can be grounded through a capacitor C D2 . In the case where the current loop dipole antenna works in a fundamental mode (such as a 1 / 4 wavelength mode), the length of B2 and the length of B3 can respectively correspond to 1 / 4 of the working wavelength. For example, the length of B2 can be less than 1 / 4 of the working wavelength. For another example, the length of B3 can be less than 1 / 4 of the working wavelength. That is, the length of the radiation branch (such as B2 plus B3) of the current loop dipole antenna can be less than 1 / 2 of the working wavelength. In some embodiments, the sum of the lengths of B2 and B3 can be greater than 1 / 4 of the working wavelength. It can be understood that the capacitor C D1 and the capacitor C D2 may correspond to the first capacitor on the current loop line antenna.

[0082] Figure 6 (c) of FIG. 1 shows a schematic of a current loop left-handed antenna. The current loop left-handed antenna can include a radiator B4. A capacitor C C1One end of B4 can be grounded, and the other end can be connected to a left-handed feed. In the present example, the left-handed feed can include a feed point, and a left-handed capacitor connected in series with the feed point. The left-handed capacitor can be used to excite a left-handed mode on B4. The structure and working mechanism of the left-handed antenna can refer to CN201380008276.8 and CN201410109571.9, which will not be described here. It can be understood that the capacitor C C1 can correspond to the second capacitor on the current loop slot antenna.

[0083] Figure 6 (d) shows a schematic of a current loop slot antenna. The current loop slot antenna can include radiators B5 and B6. B5 and B6 can be connected through a feed point. One end of B5 away from B6, and one end of B6 away from B5 can be grounded respectively. Thus B5 and B6 and the reference ground can form a slot for radiation. In the present example, a capacitor C S1 may be connected in series on B5, and a capacitor C S2 may be connected in series on B6. It can be understood that the capacitor C C1 and the capacitor C S2 can correspond to the second capacitor on the current loop slot antenna.

[0084] In the examples as shown in Figure 6 , all are fed by direct feeding. In other implementations of the present application, the above-mentioned current loop antenna can also be excited by coupling feeding. Exemplary, Figure 7 shows a schematic of a current loop monopole antenna with coupling feeding.

[0085] As shown in Figure 7 , the current loop monopole antenna can include a radiating branch and a feeding branch. The radiating branch can include a radiator B12, both ends of B12 are grounded through capacitors C CM1 and C CM2 respectively. The feeding branch can be used for coupling feeding, and the feeding branch can include a first feeding part CB12 and a second feeding part CB13, CB13 and CB12 can be connected through a feed point, and the other end of CB12 and CB13 are both grounded. The feeding branch can be arranged between the radiating branch and the reference ground. Thus the radiating branch is excited to radiate with current loop radiation characteristics.

[0086] It should be understood that for other current loop antennas, excitation can also be performed in the form of coupling feed. The structure of the feed branch can also be various. For details, please refer to the following patent applications: Application No. 202110961752.4, Application No. 202110963510.9, Application No. 202110961755.8, and Application No. 202110962491.8. Here, no further description is given.

[0087] The above Figure 5 , Figure 6 and Figure 7 The current loop antenna is exemplarily described, and the following Figure 8 and Figure 9 The magnetic current loop antenna is briefly described.

[0088] Exemplarily, in combination with Figure 8 , a schematic of the magnetic current loop antenna is provided. As Figure 8 indicated, the magnetic current loop antenna can include at least one radiation branch. The radiation branch can be used to perform radiation with the radiation characteristics of the magnetic current loop antenna. Among them, the radiation characteristics of the magnetic current loop antenna described in the embodiments of the present application can include: generating a uniform electric field distribution between the radiation branch and the reference ground. For example, as Figure 8 indicated, a uniform downward electric field can be distributed between the antenna radiation branch and the reference ground. Of course, in other scenarios, due to the continuous change of the feed signal, the electric field can also be uniformly distributed upward.

[0089] As a possible implementation, the magnetic current loop antenna provided by the embodiments of the present application can be based on the existing electric field type antenna, and inductors are connected in series and / or parallel on the radiation branch, so that the position with high potential on the radiator can be connected to the ground through the inductor, thereby reducing the potential of this part, and further reducing the electric field near the high potential; Correspondingly, by setting the energy storage characteristics of the inductor to the magnetic energy, the electric field change and the current change of the low electric field region appear time difference, and then when the current is enhanced according to the current provided by the feed point, the electric field of the original low electric field region can be quickly enhanced, while the electric field of the original high electric field region still maintains high electric field in the subsequent period of time. Thus, a uniformly distributed electric field is obtained near the radiation branch. Similar to the foregoing description of the capacitor, in the embodiments of the present application, the inductors are all exemplarily described in the form of lumped inductors. In other embodiments of the present application, the function of the inductor can also be realized in other forms, such as distributed inductor.

[0090] It should be understood that in the case of uniform electric field distribution, a magnetic current loop with closed characteristics can be formed in the space near the radiation branch. That is, the radiation characteristics of the magnetic current loop antenna involved in the embodiments of the present application can also include: generating a closed magnetic current loop distribution near the radiation branch. For example, asFigure 8 As shown, near the antenna radiation branch, a closed magnetic current loop in the counterclockwise direction can be formed. Similar to the above description of the electric field distribution, in other scenarios, due to the feed signal being in constant change, the magnetic current loop can also be a clockwise closed distribution.

[0091] Based on the above description of the characteristics of the magnetic current loop antenna in operation (such as the radiation characteristics of the magnetic current loop antenna), since the magnetic current loop antenna provided by the embodiment of the present application can generate a uniform electric field (or a closed magnetic current loop) for radiation during operation, combined with the foregoing description, the magnetic current loop antenna can provide better radiation performance than general electric field type antennas with non-uniform electric fields.

[0092] Figure 9 Several possible magnetic current loop antennas are shown. It should be noted that in different implementations of the present application, according to the differences in the composition structure of the magnetic current loop antenna, the magnetic current loop antenna can be divided into a magnetic current loop wire antenna and a magnetic current loop slot antenna. Among them, the magnetic current loop wire antenna can include a magnetic current loop monopole antenna, a magnetic current loop dipole antenna, etc. The magnetic current loop slot antenna can include a magnetic current loop left-handed antenna, a magnetic current loop slot antenna, etc.

[0093] On the magnetic current loop wire antenna, a parallel first inductor can be provided, thereby realizing the working mechanism as shown in Figure 8 In some implementations, one or more inductors can also be connected in series on the radiator of the magnetic current loop wire antenna, thereby improving the radiation performance of the magnetic current loop wire antenna.

[0094] Corresponding to the magnetic current loop wire antenna, on the magnetic current loop slot antenna, a series second inductor can be provided, thereby realizing the working mechanism as shown in Figure 8 In some implementations, more inductors can also be connected in series on the radiator of the magnetic current loop slot antenna, thereby improving the radiation performance of the magnetic current loop wire antenna.

[0095] Figure 9 (a) in FIG. 1 shows a magnetic current loop monopole antenna. The magnetic current loop monopole antenna can include a radiator B1, one end of B1 can be grounded through an inductor L M1 , and the other end of B1 can be connected with a feed point. In the case of the antenna operating in the fundamental mode, the length of B1 can be related to 1 / 4 of the operating wavelength. For example, the length of B1 can be less than 1 / 4 of the operating wavelength. It can be understood that the inductor L M1 can correspond to the first inductor on the magnetic current loop wire antenna.

[0096] Figure 9B3. The end of B2 away from B3 can be connected to ground through an inductor L D1 B3 can be connected to ground through an inductor L D2 In some embodiments, the arrangement of B2 and B3 can be symmetric with respect to the feed point. In the case that the antenna operates in the fundamental mode, the length of B2 (or B3) can be related to ¼ of the operating wavelength. For example, the length of B2 can be less than ¼ of the operating wavelength. For another example, the length of B3 can be less than ¼ of the operating wavelength. For yet another example, the length of the antenna that consists of B2 and B3 can be less than ½ of the operating wavelength and greater than ¼ of the operating wavelength. It can be appreciated that the inductor L D1 The inductor L D2 may correspond to the first inductor on the magnetic current loop wire antenna.

[0097] Figure 9 (c) of FIG. 1 shows a magnetic current loop left-handed antenna. The magnetic current loop left-handed antenna can include a radiator B4. One end of the B4 can be connected to ground and the other end can be connected to a left-handed feed. The form of the left-handed feed can refer to the left-handed feed shown in Figure 6 The inductor L C1 may be connected in series on the B4. It can be appreciated that the inductor L C1 may correspond to the second inductor on the magnetic current loop slot antenna.

[0098] Figure 9 (d) of FIG. 1 shows a magnetic current loop slot antenna. The magnetic current loop slot antenna can include radiators B5 and B6. The B5 and B6 can be connected through a feed point. The end of B5 away from B6 can be connected to ground and the end of B6 away from B5 can be connected to ground. In this way, B5 and B6 can form a slot with the reference ground for radiation. In this example, an inductor L S1 may be connected in series on the B5 and an inductor L S2 may be connected in series on the B6. It can be appreciated that the inductor L S1 The inductor L S2 may correspond to the second inductor on the magnetic current loop slot antenna.

[0099] In the examples of Figure 9 , excitation is described by way of direct feeding. In other embodiments of the present application, the magnetic current loop antenna can also be excited by way of coupled feeding. An exemplary Figure 10 shows a schematic diagram of a coupled feeding magnetic current loop monopole antenna. As shown in Figure 10 , both ends of the radiator B11 of the antenna can be connected through inductors (such as L CM1 and LCM2 )Ground. A feed branch CB11 can be provided between the radiation branch and the reference ground, both ends of the CB11 can be provided in suspension, the CB11 can be connected with the feed point, and the feed point can be provided at the center position of the CB11. Thus, the excitation of the magnetic current loop antenna can be realized, so that the B11 performs radiation with the magnetic current loop radiation characteristics. It should be understood that for other magnetic current loop antennas, excitation can also be performed in the form of coupled feeding. The structure of the feed branch can also be various. For details, please refer to the following patent applications: application number 202111034604.4, application number 202111034603.X, application number 202111034611.4, and application number 202111033384.3. Here, no longer described.

[0100] The high-isolation antenna scheme provided by the embodiments of the present application can be used in an antenna system including multiple antennas. The antenna system can include an antenna pair with high-isolation characteristics. The high-isolation antenna pair is described below in conjunction with specific embodiments.

[0101] It should be noted that in the embodiments of the present application, the feed method of the antenna can be direct feeding or coupled feeding. Regardless of direct feeding or coupled feeding, symmetric feeding or anti-symmetric feeding can be used to input signals to the feed point of the antenna to excite the antenna.

[0102] The feed signal of symmetric feeding (referred to as symmetric feed signal) and the feed signal of anti-symmetric feeding (referred to as anti-symmetric feed signal) can have the characteristic of phase inversion. For example, the phase of the symmetric feed signal and the anti-symmetric feed signal can differ by 180 degrees.

[0103] In some embodiments, the symmetric feed signal and the anti-symmetric feed signal can also come from the same feed source. The signal of the feed source can be directly input to the port requiring symmetric feeding as the symmetric feed signal. The signal of the feed source can also be inverted through an inverter or the like to obtain the corresponding anti-symmetric feed signal, so that the anti-symmetric feed signal can be input to the corresponding port to achieve anti-symmetric feeding.

[0104] For example, in conjunction with Figure 11 , the feed source 1 can provide an original feed signal. The original feed signal can be directly transmitted to the port A of the antenna A and the port B of the antenna B without phase inversion processing, to achieve symmetric feeding of the antenna A and the antenna B. In addition, the original feed signal can also be processed by an inverter before being transmitted to the port A of the antenna A and the port B of the antenna B, to obtain an anti-symmetric signal after phase inversion, and the anti-symmetric signal is transmitted to the port A and the port B, thereby achieving anti-symmetric feeding of the antenna A and the antenna B.

[0105] Similarly, the two states (e.g., the symmetric feeding state of the antenna A and the antenna B, and the anti-symmetric feeding state of the antenna A and the antenna B) can respectively excite the transverse current and the longitudinal current on the floor, so as to have orthogonality in the field distribution, and thus better isolation is obtained.

[0106] It should be noted that the symmetric feeding and the anti-symmetric feeding can be relative, for example, the symmetric feeding and the anti-symmetric feeding can indicate that the two feeding signals have the characteristics of equal amplitude and opposite phase. In the case of two or more antennas being symmetrically fed, the feeding signals of the antennas can have the characteristics of equal amplitude and same phase.

[0107] The scheme provided by the embodiments of the present application will be described below in combination with specific examples.

[0108] The antenna scheme provided by the embodiments of the present application can be used to cover at least one working frequency band. The covered working frequency band can include the overlapping coverage frequency band of each antenna in an antenna pair (e.g., an antenna pair composed of the antenna A and the antenna B).

[0109] The working frequency band can include a low frequency (Low band, LB), a middle frequency (middle band, MB), and / or a high frequency (high band, HB). In some embodiments, the low frequency can include a frequency band range of 450M-1GHz. The middle frequency can include a frequency band range of 1G-3GHz. The high frequency can include a frequency band range of 3GHz-10GHz. It can be understood that in different embodiments, the low, middle and high frequency bands can include the working frequency bands required by communication technologies such as Bluetooth (BT), global positioning system (GPS), wireless fidelity (Wi-Fi), global system for mobile communications (GSM), wideband code division multiple access (WCDMA), long term evolution (LTE), 5G, SUB-6G and other future communication technologies, etc. As an example, the LB frequency band can cover 450MHz-1GHz, the MB frequency band can cover 1GHz-3GHz, and the HB frequency band can cover 3GHz-10GHz. In some implementations, the LB, MB and HB can include common frequency bands such as 5G NR, WiFi 6E, UWB, etc.

[0110] Please refer toFigure 12 This is a schematic diagram of a high-isolation antenna pair provided in an embodiment of this application. In this example, the high-isolation antenna pair may include antenna 1 and antenna 2. Antenna 1 and antenna 2 may be current loop antennas. The current loop antenna may have any of the possible implementations of a current loop antenna described in the above example.

[0111] The following example uses a current-loop monopole antenna where both antenna 1 and antenna 2 are directly fed. For instance, antenna 1 can be a current-loop antenna 1, and antenna 2 can be a current-loop antenna 2. Exemplarily, combined with... Figure 12 Antenna 1 may include a radiator B11, one end of which may have a port 1 for feeding power to B11. The other end of B11 may be grounded through a capacitor CM11. When antenna 1 operates in fundamental mode, the length of B11 may be less than 1 / 4 of the corresponding operating wavelength. Correspondingly, antenna 2 may include a radiator B12, one end of which may have a port 2 for feeding power to B12. The other end of B12 may be grounded through a capacitor CM12. When antenna 2 operates in fundamental mode, the length of B12 may be less than 1 / 4 of the corresponding operating wavelength.

[0112] Both antenna 1 and antenna 2 can operate in symmetrical feeding mode and antisymmetrical feeding mode, respectively. For example, combining... Figure 13 .like Figure 13 As shown in (a) above, under symmetrical feeding conditions, both port 1 of antenna 1 and port 2 of antenna 2 can be excited by symmetrical feeding signals. Figure 13 As shown in (b), under antisymmetric feeding conditions, both port 1 of antenna 1 and port 2 of antenna 2 can be excited by antisymmetric feeding signals. The acquisition of symmetrical and antisymmetric feeding signals can be found in [reference needed]. Figure 11 as well as Figure 12 The following description is provided. In some embodiments, antenna 1 and antenna 2 can operate simultaneously in a symmetrical feed state and an antisymmetric feed state. That is, port 1 can be excited by a symmetrical feed while also receiving an antisymmetric feed signal. Similarly, port 2 can be excited by a symmetrical feed while also receiving an antisymmetric feed signal. In this way, the antenna pair consisting of antenna 1 and antenna 2 can simultaneously provide both symmetrical feed mode and antisymmetric feed mode.

[0113] It should be noted that, in cases such as Figure 12 and Figure 13 The example uses a mirrored configuration of antenna 1 and antenna 2. (By...) Figure 12 and Figure 13As can be seen from the examples, the feeding point can be arranged close to the center of the electronic device, i.e. the feeding point of the antenna 1 can be arranged on the side of the antenna 1 close to the center of the electronic device, and the feeding point of the antenna 2 can be arranged on the side of the antenna 2 close to the center of the electronic device. In other embodiments of the present application, the feeding points of the antenna 1 and / or the antenna 2 can also be arranged on the other side of the examples shown in Figure 12 . Alternatively, the feeding points can also be arranged flexibly according to the specific design of the current loop antenna.

[0114] In the present example, the mode of the symmetric feeding state can be referred to as symmetric feeding mode, and the mode of the anti-symmetric feeding state can be referred to as anti-symmetric feeding mode. The symmetric feeding mode and the anti-symmetric feeding mode can respectively excite orthogonal currents on the ground plane. For example, as shown in Figure 14 , in the symmetric feeding mode, a longitudinal (e.g. upward) current can be excited on the ground plane. In the anti-symmetric feeding mode, a transverse (e.g. rightward) current can be excited on the ground plane. The currents can correspond to the electric field distributions shown in Figure 15 . As shown in Figure 15 , in the symmetric feeding mode, the electric field direction of the head of the electronic device can be a direction from the outside to the electronic device. In the anti-symmetric feeding mode, the electric field direction of the head of the electronic device can be a direction from the left side of the electronic device to the right side of the electronic device. With the excitation of the current distribution and the electric field distribution as shown in Figure 14 or Figure 15 , the spatial field distribution can also have orthogonality in the two different modes. For example, referring to Figure 16 , the far field distribution is shown. In the anti-symmetric feeding mode, the far field distribution can be close to a longitudinal distribution. In the symmetric feeding mode, the far field distribution can be close to a transverse distribution. Thus, in the anti-symmetric feeding mode and the symmetric feeding mode of the antenna pair, the two modes can obtain orthogonal field distributions, thereby obtaining better isolation.

[0115] The following further describes in combination with S parameter and efficiency simulation.

[0116] As shown in Figure 17 , in the anti-symmetric feeding mode and the symmetric feeding mode, both can work near 1.8 GHz, and the deepest point of S11 is more than -10 dB. At the same time, the bandwidth is sufficient to cover at least one working frequency band. In addition, in Figure 17In the diagram illustrating the isolation, under both operating modes, although antenna 1 is simultaneously excited by both symmetrical and antisymmetric feed signals, and antenna 2 is also simultaneously excited by both symmetrical and antisymmetric feed signals, the symmetrical feed mode formed by both antennas 1 and 2, and the antisymmetric feed mode formed by both antennas 1 and 2, still exhibit very good isolation, with the highest point being below -120dB. Therefore, the two operating modes have excellent isolation and virtually no mutual interference during operation.

[0117] Figure 18A Efficiency simulation diagrams for two operating modes are shown. For example... Figure 18A As shown in (a), in terms of radiation efficiency, the radiation efficiency of the antisymmetric feeding mode exceeds -1 dB, while the radiation efficiency of the symmetric feeding mode exceeds -4 dB. Figure 18A As shown in (b), from the perspective of system efficiency, the system efficiency of the antisymmetric feeding mode has exceeded -2dB and is close to -1dB, while the system efficiency of the symmetric feeding mode has exceeded -4dB and is close to -3dB. Therefore, both modes can provide good radiation performance.

[0118] Therefore, through the above Figure 12- Figure 18A As can be seen from the explanation, in the presence of such Figure 12 The antenna pair shown, consisting of antenna 1 and antenna 2, can operate in symmetrical feeding mode and antisymmetric feeding mode through symmetrical feeding and antisymmetric feeding mode. The radiation performance in both modes can be guaranteed due to the good radiation performance of the current loop antenna. At the same time, the isolation between the two modes is also very good, thus forming a high-isolation antenna pair.

[0119] It should be noted that the above example uses a direct-fed current loop monopole antenna as an example. In other embodiments of this application, the current loop antennas corresponding to antenna 1 and / or antenna 2 can also be other forms of current loop antennas provided in the above examples. For example, a direct-fed current loop dipole antenna, a direct-fed current loop slot antenna, or a direct-fed left-handed current loop antenna. Other examples include a coupled-fed current loop monopole antenna, a coupled-fed current loop dipole antenna, a coupled-fed current loop slot antenna, and a coupled-fed left-handed current loop antenna. Specific implementations can be found in the aforementioned examples and will not be repeated here.

[0120] For example, Figure 18B A schematic diagram of a high-isolation antenna pair consisting of a coupled-fed current loop antenna is shown. The coupled-fed current loop antenna has, for example,... Figure 7 The components shown are used as an example. For instance... Figure 18BAs shown, the antenna 1 in the electronic device can be a current loop antenna 1-1 with coupled feed. Correspondingly, the antenna 2 in the electronic device can be a current loop antenna 1-2 with coupled feed. The current loop antenna 1-1 can include a radiating branch B12-1, and the two ends of the radiating branch can be grounded by capacitors respectively. For example, C CM1-1 and C CM2-1 can be arranged at the two ends of the radiating branch respectively. The current loop antenna 1-1 can further include a feeding branch composed of CB12-1 and CB13-1. One end of CB12-1 and CB13-1 is grounded respectively, and the opposite ends of CB12-1 and CB13-1 are connected by a feeding port (e.g., port 1). Similarly, the current loop antenna 1-2 can include a radiating branch B12-2, and the two ends of the radiating branch can be grounded by capacitors respectively. For example, C CM1-2 and C CM2-2 can be arranged at the two ends of the radiating branch respectively. The current loop antenna 1-2 can further include a feeding branch composed of CB12-2 and CB13-2. One end of CB12-2 and CB13-2 is grounded respectively, and the opposite ends of CB12-2 and CB13-2 are connected by a feeding port (e.g., port 2).

[0121] It should be understood that, similar to the high isolation and high radiation performance characteristics of the high-isolation antenna pair composed of the aforementioned direct-fed current loop antennas, the antenna pair composed of the coupled-fed antennas as shown in Figure 18B also has the effect of high isolation and good radiation characteristics.

[0122] In the above examples, the antenna pair is composed of two current loop antennas. In some embodiments of the present application, the antenna pair can also be composed of two magnetic current loop antennas, which can also work in symmetric feeding mode and anti-symmetric feeding mode respectively to form a high-isolation antenna pair.

[0123] For example, please refer to Figure 19 , which is a schematic diagram of a high-isolation antenna pair provided by an embodiment of the present application. In this example, the high-isolation antenna pair can include an antenna 3 and an antenna 4. The antenna 3 and the antenna 4 can be magnetic current loop antennas. The magnetic current loop antennas can have any possible implementation of the magnetic current loop antennas described in the above examples.

[0124] In the following, the antenna 3 and the antenna 4 are taken as examples of direct-fed magnetic current loop monopole antennas. For example, in combination with Figure 19Antenna 3 (i.e., magnetic flux loop antenna 1) may include a radiator 13, one end of which may be provided with a port 3 for feeding B13. The other end of B13 can be grounded through an inductor LM11. When antenna 3 operates in fundamental mode, the length of B13 can be less than 1 / 4 of the corresponding operating wavelength. Correspondingly, antenna 4 (i.e., magnetic flux loop antenna 2) may include a radiator B14, one end of which may be provided with a port 4 for feeding B14. The other end of B14 can be grounded through an inductor LM12. When antenna 4 operates in fundamental mode, the length of B14 can be less than 1 / 4 of the corresponding operating wavelength.

[0125] Both antenna 3 and antenna 4 can operate in symmetrical feeding mode and antisymmetrical feeding mode, respectively. For example, in combination... Figure 20 .like Figure 20 As shown in (a), under symmetrical feeding conditions, both port 3 of antenna 3 and port 4 of antenna 4 can be excited by symmetrical feeding signals. Figure 20 As shown in (b), under antisymmetric feeding conditions, both port 3 of antenna 3 and port 4 of antenna 4 can be excited by antisymmetric feeding signals. The acquisition of symmetric and antisymmetric feeding signals can be found in [reference needed]. Figure 11 as well as Figure 12 The following description is provided. In some embodiments, antennas 3 and 4 can operate simultaneously in a symmetrical feed state and an antisymmetric feed state. That is, port 3 can be excited by symmetrical feeding while also receiving antisymmetric feed signals. Similarly, port 4 can be excited by symmetrical feeding while also receiving antisymmetric feed signals. In this way, the antenna pair consisting of antennas 3 and 4 can simultaneously provide both symmetrical feed mode and antisymmetric feed mode.

[0126] It should be noted that, in cases such as Figure 19 and Figure 20 The example uses a mirrored configuration of antennas 3 and 4. Figure 19 and Figure 20 As can be seen from the examples, the feed points can be positioned close together; that is, the feed point of antenna 3 can be located on the side of antenna 3 closer to the center of the electronic device, and the feed point of antenna 4 can be located on the side of antenna 4 closer to the center of the electronic device. In some other embodiments of this application, the feed points of antenna 3 and / or antenna 4 can also be positioned differently than those shown above. Figure 19 The other side of the example shown. Alternatively, the feed point can be flexibly set according to the specific design of the magnetic flux loop antenna.

[0127] In this example, similar to the aforementioned current loop antenna, the symmetric feeding mode and the anti-symmetric feeding mode can respectively excite the orthogonal currents on the floor. For example, as shown in Figure 21 , in the symmetric feeding mode, the longitudinal (e.g. upward) current can be excited on the floor. In the anti-symmetric feeding mode, the transverse (e.g. leftward) current can be excited on the floor. The currents can correspond to the electric field distributions shown in Figure 22 . As shown in Figure 22 , in the symmetric feeding mode, the electric field direction of the electronic device head can be from the electronic device to the outside of the electronic device. In the anti-symmetric feeding mode, the electric field direction of the electronic device head can be from the left side of the electronic device to the right side of the electronic device. With the excitation of the current distribution and the electric field distribution shown in Figure 21 or Figure 22 , the spatial field distribution can also have orthogonality in the two different modes. For example, referring to Figure 23 , the far field distribution is shown. In the anti-symmetric feeding mode, the far field distribution can be close to the longitudinal distribution. In the symmetric feeding mode, the far field distribution can be close to the transverse distribution. Thus, in the anti-symmetric feeding mode and the symmetric feeding mode, the two modes can obtain orthogonal field distributions, thereby obtaining better isolation.

[0128] The following further describes the S parameter and the efficiency simulation.

[0129] As shown in Figure 24 , in the anti-symmetric feeding mode and the symmetric feeding mode, the S11 deepest point is more than -15 dB near 1.8 GHz. At the same time, the bandwidth is sufficient to cover at least one working frequency band. In addition, in the isolation diagram shown in Figure 24 , in the two working modes, although the antenna 3 is excited by the symmetric feeding signal and the anti-symmetric feeding signal, and the antenna 4 is also excited by the symmetric feeding signal and the anti-symmetric feeding signal, the symmetric feeding mode formed by the symmetric feeding antenna 3 and the symmetric feeding antenna 4 and the anti-symmetric feeding mode formed by the anti-symmetric feeding antenna 3 and the anti-symmetric feeding antenna 4 still have very good isolation, and the highest point is also lower than -120 dB. Therefore, the two working modes have very good isolation, and basically do not affect each other during working.

[0130] Figure 25A Efficiency simulation diagrams in the two working modes are shown. As shown in Figure 25A (a), in terms of radiation efficiency, the radiation efficiency of the anti-symmetric feeding mode is close to -1 dB, and the radiation efficiency of the symmetric feeding mode is more than -4 dB. As shown in Figure 25AAs shown in (b) of FIG. 6, from the perspective of system efficiency, the system efficiency of the anti-symmetry feeding mode has exceeded -2dB, close to -1dB, and the system efficiency of the symmetry feeding mode has also exceeded -4dB, close to -3dB. Therefore, both modes can provide better radiation performance.

[0131] As such, by the above Figure 19- Figure 25A description, it can be seen that, in the antenna pair including the antenna 3 and the antenna 4 with the composition as shown in Figure 19 , the antenna pair can work in the symmetry feeding mode and the anti-symmetry feeding mode through the symmetry feeding and the anti-symmetry feeding, and the radiation performance in both modes can be guaranteed due to the good radiation performance of the magnetic current loop antenna, and the isolation in both modes is also very good, thereby forming a high-isolation antenna pair.

[0132] It should be noted that in the above examples, the magnetic current loop antenna is taken as an example for illustration. In other embodiments of the present application, the magnetic current loop antenna corresponding to the antenna 3 and / or the antenna 4 can also be in the form of other magnetic current loop antennas provided in the above examples. For example, a directly-fed magnetic current loop monopole antenna, a directly-fed magnetic current loop dipole antenna, a directly-fed magnetic current loop slot antenna, a directly-fed magnetic current loop left-handed antenna. For another example, a coupled-fed magnetic current loop monopole antenna, a coupled-fed magnetic current loop dipole antenna, a coupled-fed magnetic current loop slot antenna, a coupled-fed magnetic current loop left-handed antenna. The specific implementation can be referred to the foregoing examples, which will not be described here.

[0133] An exemplary Figure 25B high-isolation antenna pair composed of a coupled-fed magnetic current loop antenna is shown. In the example, the coupled-fed magnetic current loop antenna has the composition as shown in Figure 10 . As shown in Figure 25B , the antenna 3 in the electronic device can be a coupled-fed magnetic current loop antenna 1-1. Correspondingly, the antenna 4 in the electronic device can be a coupled-fed magnetic current loop antenna 1-2. The magnetic current loop antenna 1-1 can include a radiation branch B11-1, and the two ends of the radiation branch can be respectively grounded through inductance. For example, L CM1-1 and L CM2-1 can be respectively arranged at the two ends of the radiation branch to ground. The magnetic current loop antenna 1-1 can further include a feeding branch CB11-1. The two ends of the feeding branch CB11-1 can be suspended, and a feeding point can be arranged at the center position of the feeding branch to be connected with the port 3. Similarly, the magnetic current loop antenna 1-2 can include a radiation branch B11-2, and the two ends of the radiation branch can be respectively grounded through inductance. For example, L CM1-2 and L CM2-2Ground. In the magnetic current loop antenna 1-2, a feed branch CB11-2 can also be included. The feed branch CB11-2 can be suspended at both ends, and a feed point can be provided at the center of the feed branch, connected with the port 4.

[0134] It should be understood that, similar to the high isolation and high radiation performance characteristics of the high-isolation antenna pair composed of the aforementioned direct-fed magnetic current loop antenna, the antenna pair composed of the coupling-fed magnetic current loop antenna also has high isolation and good radiation characteristics. Figure 25B

[0135] From the above description, those skilled in the art should understand that, by symmetrically feeding and anti-symmetrically feeding the antenna pair composed of the electric current loop antenna or the antenna pair composed of the magnetic current loop antenna respectively, two good-isolation working states, such as the symmetrically-fed state and the anti-symmetrically-fed state, can be obtained in a limited space. In combination with the analysis of the floor current in the aforementioned two embodiments (such as the corresponding current distribution shown in Figure 14 and the far-field pattern distribution shown in Figure 16 , and the corresponding current distribution shown in Figure 21 and the far-field pattern distribution shown in Figure 23 , the high-isolation effect can be proved from the perspective of current distribution and far-field pattern.

[0136] The following provides the far-field patterns of the existing antenna pair in the symmetrically-fed state and the anti-symmetrically-fed state, compared with the scheme provided by the present application, to further illustrate the effect of the scheme provided by the present application.

[0137] For example, Figure 26 is a schematic of a symmetrically-distributed left-handed antenna pair. The left-handed antenna pair can include a left-handed antenna A and a left-handed antenna B. The left-handed antenna A can be fed through a port 5A. The port 5A can be provided with a feed point 5A and a left-handed capacitor 5A. The left-handed antenna B can be fed through a port 5B. The port 5B can be provided with a feed point 5B and a left-handed capacitor 5B.

[0138] In some implementations, referring to the aforementioned symmetrically-fed and anti-symmetrically-fed descriptions, symmetrically-fed signals can be fed into the port 5A and the port 5B respectively, so that the left-handed antenna pair works in the symmetrically-fed state. In addition, anti-symmetrically-fed signals can also be fed into the port 5A and the port 5B respectively, so that the left-handed antenna pair works in the anti-symmetrically-fed state. The symmetrically-fed state and the anti-symmetrically-fed state can also have good isolation. For example, Figure 27 shows the far-field patterns in the two states. It can be seen that the left-handed antenna pair composed of Figure 26 ​The IFA antenna pair composed of the left-hand antenna pair has a far-field pattern in which, in the anti-symmetrical feeding state, the strong gain region is distributed on the upper and lower edges of the floor. In the symmetrical feeding state, the strong gain region is distributed on the lower part of the floor.

[0139] Figure 28 The figure is a schematic of a symmetrical IFA antenna pair. The IFA antenna pair can include IFA antenna A and IFA antenna B. IFA antenna A can be fed through port 6A. The port 6A can be provided with a feeding point 6A. IFA antenna B can be fed through port 6B. The port 6B can be provided with a feeding point 6B.

[0140] In some implementations, referring to the foregoing descriptions of the symmetrical feeding and the anti-symmetrical feeding, symmetrical feeding signals can be fed into the port 6A and the port 6B respectively, so that the IFA antenna pair works in the symmetrical feeding state. In addition, anti-symmetrical feeding signals can also be fed into the port 6A and the port 6B respectively, so that the IFA antenna pair works in the anti-symmetrical feeding state. The symmetrical feeding state and the anti-symmetrical feeding state can also have good isolation. Exemplarily, Figure 29 The far-field patterns in the two states are shown. It can be seen that, in the symmetrical feeding state, the IFA antenna pair has a far-field pattern as shown in Figure 28 The IFA antenna pair composed of the left-hand antenna pair has a far-field pattern in which, in the anti-symmetrical feeding state, the strong gain region is distributed on the lower edge of the floor, and there is also a strong gain distribution in the region close to the middle of the floor. In the symmetrical feeding state, the strong gain region is distributed on the lower part of the floor.

[0141] Figure 30 The figure is a schematic of a symmetrical ILA antenna pair. The ILA antenna pair can include ILA antenna A and ILA antenna B. ILA antenna A can be fed through port 7A. The port 7A can be provided with a feeding point 7A. ILA antenna B can be fed through port 7B. The port 7B can be provided with a feeding point 7B.

[0142] In some implementations, referring to the foregoing descriptions of the symmetrical feeding and the anti-symmetrical feeding, symmetrical feeding signals can be fed into the port 7A and the port 7B respectively, so that the ILA antenna pair works in the symmetrical feeding state. In addition, anti-symmetrical feeding signals can also be fed into the port 7A and the port 7B respectively, so that the ILA antenna pair works in the anti-symmetrical feeding state. The symmetrical feeding state and the anti-symmetrical feeding state can also have good isolation. Exemplarily, Figure 31 The far-field patterns in the two states are shown. It can be seen that, in the symmetrical feeding state, the IFA antenna pair has a far-field pattern as shown in Figure 30 The ILA antenna pair composed of the left-hand antenna pair has a far-field pattern in which, in the anti-symmetrical feeding state, the strong gain region is distributed on the lower edge of the floor. In the symmetrical feeding state, the strong gain region is distributed on the lower part of the floor.

[0143] It can be seen that the above-mentioned three antenna pairs composed of existing antennas, such as the left-hand antenna pair, the IFA antenna pair, and the ILA antenna pair. Better isolation can also be achieved by symmetric feeding and anti-symmetric feeding. However, it can be seen from the radiation pattern that due to poor ground excitation, the strength distribution of the radiation pattern is uneven, and there is a significant low-gain area. The corresponding low-gain area has poor radiation performance.

[0144] In contrast, the current loop antenna pair provided by the present application Figure 16 The radiation pattern of the high-isolation current loop antenna pair shown in the figure is longitudinally distributed more uniformly in size due to the better ground current excitation of the current loop antenna in the anti-symmetric feeding state, and there is no significant low-gain area. Correspondingly, in the symmetric feeding state, the size of the gain is distributed more uniformly in the transverse direction due to the better ground current excitation of the current loop antenna, and there is no significant low-gain area. That is, the radiation pattern distribution of the current loop antenna pair provided by the embodiments of the present application is more uniform than the radiation pattern distribution of the above-mentioned three existing antenna pairs, so the radiation performance in each direction can be better, thereby providing better isolation and better radiation performance. For example, better bandwidth, efficiency, and SAR, etc.

[0145] Similar to the above-mentioned current loop antenna pair, referring to the far-field radiation pattern of the magnetic current loop antenna pair provided by the present application Figure 23 As can be seen from the far-field radiation pattern of the magnetic current loop antenna pair provided by the present application, due to the better ground current excitation of the magnetic current loop antenna, the gain distribution of the radiation pattern in each direction is good in both working modes, thereby providing better isolation and better radiation performance. For example, better bandwidth, efficiency, and SAR, etc.

[0146] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of the present application. Accordingly, the present specification and drawings are merely illustrative of the exemplary embodiments of the present application and are to be regarded as covering all modifications, variations, combinations or equivalents that are within the scope of the present application. Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A high isolation terminal antenna system, characterized by, The terminal antenna system is applied to an electronic device, and comprises a first antenna pair, the first antenna pair comprising a first antenna and a second antenna, the first antenna and the second antenna being current loop antennas, or the first antenna and the second antenna being magnetic current loop antennas; The current loop antenna radiates through a uniform magnetic field between a radiation branch and a reference ground; The magnetic current loop antenna radiates through a uniform electric field between a radiation branch and a reference ground; A feeding port of the first antenna is a first port, a feeding port of the second antenna is a second port, and a feeding signal fed into the first port and the second port simultaneously comprises a symmetric feeding signal and an anti-symmetric feeding signal; When the feeding signal fed into the first port and the second port is the symmetric feeding signal, the first antenna pair works in a symmetric feeding state; When the feeding signal fed into the first port and the second port is the anti-symmetric feeding signal, the first antenna pair works in an anti-symmetric feeding state; A current direction of an excited ground plane in the symmetric feeding state is a first direction, and a current direction of an excited ground plane in the anti-symmetric feeding state is a second direction, the first direction and the second direction being orthogonal.

2. The terminal antenna system according to claim 1, characterized in that, The symmetric feeding signal and the anti-symmetric feeding signal are equal-amplitude and opposite-phase feeding signals.

3. The terminal antenna system according to claim 1 or 2, characterized in that, Structures of the first antenna and the second antenna are mirror-symmetrical.

4. The terminal antenna system according to claim 3, characterized in that, The first antenna and the second antenna are in a straight feeding mode, or The first antenna and the second antenna are in a coupled feeding mode.

5. The terminal antenna system according to claim 4, characterized in that, When the first antenna and the second antenna are both in the straight feeding mode, Feeding ports of the first antenna and the second antenna are arranged at antenna radiator ends close to each other or at antenna radiator ends far away from each other.

6. The terminal antenna system according to claim 1 or 2, characterized in that, The first antenna and the second antenna are arranged at a same side of the electronic device, When the first antenna and the second antenna are both in the straight feeding mode, A feeding point of the first antenna is arranged at a left end of a radiator of the first antenna, and a feeding point of the second antenna is arranged at a left end of a radiator of the second antenna; or A feeding point of the first antenna is arranged at a right end of a radiator of the first antenna, and a feeding point of the second antenna is arranged at a right end of a radiator of the second antenna; or A feeding point of the first antenna is arranged at an upper end of a radiator of the first antenna, and a feeding point of the second antenna is arranged at an upper end of a radiator of the second antenna; or A feeding point of the first antenna is arranged at a lower end of a radiator of the first antenna, and a feeding point of the second antenna is arranged at a lower end of a radiator of the second antenna.

7. The terminal antenna system according to claim 4, characterized in that, ​ ​ when the first antenna and the second antenna are both current loop antennas fed by coupling, the first antenna comprises a first radiating branch and a first feeding branch for coupling feeding the first radiating branch, at least one end of the first radiating branch being grounded by a capacitance.

8. The terminal antenna system according to claim 4, wherein, when the first antenna and the second antenna are both magnetic current loop antennas fed by coupling, the first antenna comprises a second radiating branch and a second feeding branch for coupling feeding the second radiating branch, at least one end of the second radiating branch being grounded by an inductance.

9. The terminal antenna system according to any one of claims 1-8, wherein, the first antenna and the second antenna are both current loop antennas, the radiators of the current loop antennas being connected in parallel with at least one first capacitance; or, the first antenna and the second antenna are both current loop slot antennas, the radiators of the current loop slot antennas being connected in series with at least one second capacitance.

10. The terminal antenna system of claim 9, wherein, the first antenna and the second antenna are of the same antenna form, the antenna form comprising any one of the following: a current loop monopole antenna, a current loop dipole antenna, a current loop left-handed antenna, a current loop slot antenna.

11. The terminal antenna system according to any one of claims 1-8, wherein, the first antenna and the second antenna are both magnetic current loop antennas, the radiators of the magnetic current loop antennas being connected in parallel with at least one first inductance; or, the first antenna and the second antenna are both magnetic current loop slot antennas, the radiators of the magnetic current loop slot antennas being connected in series with at least one second inductance.

12. The terminal antenna system of claim 11, wherein, the first antenna and the second antenna are of the same antenna form, the antenna form comprising any one of the following: a magnetic current loop monopole antenna, a magnetic current loop dipole antenna, a magnetic current loop left-handed antenna, a magnetic current loop slot antenna.

13. An electronic device, comprising: the electronic device is provided with at least one processor, a radio frequency module, and a terminal antenna system as claimed in any one of claims 1-12; the electronic device transmits or receives signals through the radio frequency module and the terminal antenna system when transmitting or receiving signals.

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