Electronic device and control method thereof

Abstract

The present application discloses an electronic device and a control method, wherein the electronic device includes a conductive middle frame and multiple antenna units. The conductive middle frame includes multiple middle frame edges connected end to end in sequence; the multiple antenna units are respectively arranged on different middle frame edges of the conductive middle frame, and the two adjacent antenna units excite current distributions with intersecting directions on the conductive middle frame, and the two relatively arranged antenna units have opposite main radiation directions in the far field. The electronic device and the control method provided by the present application can effectively improve the isolation between the multiple antenna units, thereby improving the antenna performance of the multi-antenna system.

Description

Technical Field

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

[0002] With the miniaturization of electronic devices and the pursuit of high-speed transmission of Internet data, the number of antennas on electronic devices has increased. How to carry out structural design and layout design between multiple antenna units to improve the isolation between multiple antenna units and thereby improve the antenna performance of the multi-antenna system has become a key point that needs to be studied. Summary of the invention

[0003] The embodiments of the present application provide an electronic device and a control method thereof that can effectively improve the isolation between multiple antenna units, thereby improving the antenna performance of a multi-antenna system.

[0004] In a first aspect, an electronic device provided by an embodiment of the present application includes:

[0005] A conductive middle frame, comprising a plurality of middle frame edges connected end to end in sequence; and

[0006] Multiple antenna units, wherein the multiple antenna units are respectively arranged on different sides of the conductive middle frame, two adjacent antenna units excite current distributions with intersecting directions on the conductive middle frame, and the main radiation directions of the two relatively arranged antenna units in the far field are opposite.

[0007] In a second aspect, an embodiment of the present application provides a control method of an electronic device, which is applied to the electronic device, and the method includes:

[0008] receiving a trigger signal based on a signal transmission rate or a signal strength;

[0009] According to the trigger signal, the RF module is controlled to excite multiple antenna units to work in the first mode or the second mode. The first mode is that the multiple antenna units form a 4*4 MIMO antenna system, and the second mode is that the multiple antenna units form a 2*2 MIMO antenna system.

[0010] The electronic device provided by the present application, by respectively arranging multiple antenna units on different middle frame edges of a conductive middle frame, two adjacently arranged antenna units excite current distributions with intersecting directions on the conductive middle frame, so that the electric field polarization directions of the adjacently arranged antenna units intersect in the far field region, so as to reduce the correlation between the adjacently arranged antenna units; the main radiation directions of the two relatively arranged antenna units in the far field region are opposite, and the main radiation directions between the relatively arranged antenna units are different, so the energy distribution areas in the far field region between the relatively arranged antenna units are different, and the overlap is small, so as to reduce the correlation between the relatively arranged antenna units, thereby improving the spatial independence of each antenna unit, improving the isolation between the multiple antenna units, reducing the envelope correlation coefficient between the multiple antenna units, and improving the antenna performance of the multiple antenna units. BRIEF 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0013] Figure 2 yes Figure 1 A schematic diagram of the exploded structure of the electronic device provided;

[0014] Figure 3 is a top view of an antenna assembly provided by the present application;

[0015] Figure 4 yes Figure 3 A detailed view of the antenna assembly shown;

[0016] Figure 5 yes Figure 4 Current distribution diagram of the first antenna unit and the second antenna unit in the antenna assembly shown;

[0017] Figure 6 yes Figure 4 The structural schematic diagram and current distribution diagram of the first antenna unit shown;

[0018] Figure 7 yes Figure 6 A structural schematic diagram of the first switching circuit shown;

[0019] Figure 8 yes Figure 6 A far-field pattern of a first antenna element is provided;

[0020] Fig. 9 yes Figure 4 The structural schematic diagram and current distribution diagram of the second antenna unit shown;

[0021] Fig.10 yes Fig. 9 The far-field pattern of the second antenna element is shown;

[0022] Fig.11 yes Fig. 9 A reflection coefficient curve graph of the first antenna unit and the second antenna unit in the antenna assembly shown;

[0023] Fig.12 yes Fig. 9 A radiation performance curve diagram of the first antenna unit and the second antenna unit in the antenna assembly shown;

[0024] Fig.13 yes Figure 4 The structural schematic diagram and current distribution diagram of the third antenna unit shown;

[0025] Fig.14 yes Fig.13 The far-field pattern of the third antenna element shown;

[0026] Fig.15 yes Figure 4 The structural schematic diagram and current distribution diagram of the fourth antenna unit shown;

[0027] Fig.16 yes Fig.15 The far-field pattern of the fourth antenna element shown;

[0028] Fig.17 yes Figure 4 A schematic diagram of a first RF module configuration method of an antenna assembly is shown;

[0029] Fig.18 yes Figure 4 A schematic diagram of a second RF module configuration method of the antenna assembly shown;

[0030] Fig.19 yes Figure 4 A circuit block diagram of a control method of the antenna assembly shown;

[0031] Fig. 20 is a flow chart of a control method of an electronic device provided in an embodiment of the present application;

[0032] Fig.21 yes Fig. 20 Flow chart of a first implementation of step 200;

[0033] Fig. 22 yes Fig. 20Flow chart of a second implementation of step 200;

[0034] Fig.23 yes Fig. 20 Flow chart of a third implementation of step 200;

[0035] Fig.24 yes Fig.17 An ECC curve diagram between a first antenna unit and a second antenna unit in the antenna assembly shown;

[0036] Fig.25 yes Fig.18 An ECC curve diagram between the first antenna unit and the third antenna unit in the antenna assembly shown;

[0037] Fig.26 yes Fig.18 An ECC curve diagram between the second antenna element and the fourth antenna element in the antenna assembly is shown.

[0038] Description of Figure Numbers:

[0039] Electronic equipment 1000;

[0040] Antenna assembly 100; display screen 200; housing 300; frame 310; back cover 320; conductive middle frame 400; first side 401; second side 402; third side 403; fourth side 404;

[0041] Antenna unit 100a; first antenna unit 10; second antenna unit 20; third antenna unit 30; fourth antenna unit 40; first antenna unit group 10a; second antenna unit group 20a; third antenna unit group 30a; fourth antenna unit group 40a;

[0042] A first current Q1; a second current Q2; a third current Q3; a fourth current Q4;

[0043] first radiator 11; first matching circuit M1; first feed source 12; first free end 111; second free end 112; first tuning point B1; first switching circuit T1; switching switch K1; regulating circuit T11;

[0044] The second radiator 21; the second matching circuit M2; the second feed source 22; the third free end 211; the second feed point A2; the fourth free end 212; the second tuning point B2; the second switching circuit T2; the third radiator 31; the third matching circuit M3; the third feed source 32; the fifth free end 311; the third feed point A3; the sixth free end 312; the third tuning point B3; the third switching circuit T3; the fourth radiator 41; the fourth matching circuit M4; the fourth feed source 42; the seventh free end 411; the fourth feed point A4; the eighth free end 412; the fourth tuning point B4; the fourth switching circuit T4; the first RF module 510; the second RF module 520. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. In addition, the reference to "embodiment" or "implementation method" in the present application means that the specific features, structures or characteristics described in conjunction with the embodiments or implementation methods may be included in at least one embodiment of the present application. The appearance of the phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0046] As the requirements for Internet access speed of electronic devices increase, the requirements for data transmission throughput also increase. The Multiple Input Multiple Output (MIMO) system has great advantages in improving data rate. The system uses multiple transmitting antennas and multiple receiving antennas at the transmitting and receiving ends of the wireless communication system, respectively, so that the signal is transmitted and received through multiple antennas at the transmitting and receiving ends, creating multiple parallel spatial channels. Multiple information flows or multiple channels are transmitted simultaneously in the same frequency band, thereby increasing the system capacity. The MIMO system can make full use of spatial resources and achieve multiple transmissions and multiple receptions through multiple antennas. Without increasing spectrum resources and antenna transmission power, the spatial dimension is increased by using multiple antennas to achieve multi-dimensional signal processing, obtain spatial diversity gain or spatial multiplexing gain, and can increase the system channel capacity exponentially.

[0047] Since the MIMO system increases signal capacity by sending parallel spatially independent data streams, the MIMO system requires low mutual coupling between antenna units. The envelope correlation coefficient (ECC) is a quantitative indicator that reflects the spatial correlation between antenna units and can be used to evaluate the independence of radiation patterns and polarization between antenna units in the MIMO system. The smaller the envelope correlation coefficient, the smaller the correlation between antenna units, the higher the diversity gain of the MIMO system, the lower the data bit error rate demodulated by the receiving end of the MIMO antenna system, and the better the communication performance of the MIMO system.

[0048] In order to obtain better communication performance of the MIMO system, the MIMO system requires that the spacing between each antenna unit is more than half a wavelength. When the MIMO system is applied to low-frequency antennas, the MIMO system has certain requirements for the spacing between each low-frequency antenna unit. However, with the miniaturization of electronic devices, the space on electronic devices is extremely limited. How to improve the poor correlation between the antenna units of the MIMO system on electronic devices, effectively improve the isolation between multiple antenna units, and thus improve the antenna performance of the multi-antenna system, is an urgent problem to be solved.

[0049] Please refer to Figure 1 , Figure 1 The following is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. The electronic device 1000 in the embodiment of the present application may be a mobile phone, a tablet computer, a desktop computer, a laptop computer, an e-reader, a handheld computer, an electronic display screen, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a personal digital assistant (PDA), an augmented reality (AR)\virtual reality (VR) device, a media player, an intelligent wearable device, and other electronic products.

[0050] See also Figure 2 The electronic device 1000 includes a conductive middle frame 400 and an antenna assembly 100 .

[0051] See also Figure 2Optionally, the conductive middle frame 400 described in the present application can be the middle frame of the electronic device 1000. The inventive concept of the present application is illustrated by taking the electronic device 1000 as a mobile phone as an example. The electronic device 1000 also includes a display screen 200 and a housing 300. The display screen 200 is arranged on the front side of the conductive middle frame 400 (the front side refers to the direction facing the user when the user normally uses the display screen 200), and the housing 300 includes a frame 310 and a back cover 320. The display screen 200 and the back cover 320 are respectively located on the front and rear sides of the conductive middle frame 400, wherein the frame 310 is connected between the display screen 200 and the back cover 320, and is surrounded by the conductive middle frame 400. The display screen 200, the frame 310 and the back cover 320 form a relatively closed whole machine housing for the electronic device 1000. Of course, in other embodiments, a display screen 200 may also be provided on the back side of the electronic device 1000.

[0052] Among them, the frame 310 and the back cover 320 can be an integral structure or a split structure. When the frame 310 and the back cover 320 are split structures, the frame 310 can form an integral structure with the middle frame (conductive middle frame 400). A plurality of mounting slots for mounting various electronic devices are formed on the middle frame. After the display screen 200, the middle frame and the back cover 320 are covered, a receiving space is formed on both sides of the middle frame. The electronic device 1000 also includes a circuit board (including a main board, a sub-board, a flexible circuit board, etc.), a battery, a camera module, a microphone, a receiver, a speaker, a face recognition module, a fingerprint recognition module, etc., which are arranged in the receiving space and can realize the basic functions of the mobile phone, which will not be repeated in this embodiment. It can be understood that the above introduction to the electronic device 1000 is only a description of an environment in which the antenna assembly 100 is applied, and the specific structure of the electronic device 1000 should not be understood as a limitation of the antenna assembly 100 provided in this application.

[0053] The conductive middle frame 400 includes a plurality of middle frame edges connected end to end in sequence.

[0054] See also Figure 3 The present application does not limit the specific shape of the conductive middle frame 400. In this embodiment, the conductive middle frame 400 is roughly rectangular as an example for illustration.

[0055] See also Figure 3, the middle frame side of the conductive middle frame 400 includes a first side 401 and a second side 402 arranged opposite to each other, and a third side 403 and a fourth side 404 connected between the first side 401 and the second side 402. Among them, the first side 401 and the third side 403 are a pair of short sides of the conductive middle frame 400. The second side 402 and the fourth side 404 are a pair of long sides of the conductive middle frame 400. It can be understood that the conductive middle frame 400 is conductive. Of course, in other embodiments, the conductive middle frame 400 can also be in a trapezoidal shape, a rhombus shape, or other shapes.

[0056] See also Figure 2 and Figure 3 For the convenience of subsequent reference, the direction in which the first side 401 and the third side 403 of the conductive middle frame 400 are arranged is defined as the Y-axis direction, wherein the direction in which the third side 403 points to the first side 401 is the positive direction of the Y-axis, and the direction in which the first side 401 points to the third side 403 is the negative direction of the Y-axis. The direction in which the second side 402 and the fourth side 404 of the conductive middle frame 400 are arranged is defined as the X-axis direction, wherein the direction in which the fourth side 404 points to the second side 402 is the positive direction of the X-axis, and the direction in which the second side 402 points to the fourth side 404 is the negative direction of the X-axis. The thickness direction of the conductive middle frame 400 is the Z-axis direction, the direction in which the back cover 320 points to the display screen 200 is the positive direction of the Z-axis, and the direction in which the display screen 200 points to the back cover 320 is the negative direction of the Z-axis.

[0057] See also Figure 3 , the antenna assembly 100 also includes a plurality of antenna units 100a. The present application does not limit the specific number of antenna units 100a. Optionally, the number of antenna units 100a can be two, three, four, five, six, seven, eight, etc. Optionally, the plurality of antenna units 100a can form a MIMO system to improve spatial diversity gain or spatial multiplexing gain, which can multiply the system channel capacity, thereby improving the data transmission throughput and the Internet access speed of the electronic device 1000.

[0058] The multiple antenna units 100a are respectively arranged on different middle frame edges of the conductive middle frame 400. Each middle frame edge is respectively arranged on a different antenna unit 100a. For example, the conductive middle frame 400 has four middle frame edges, the number of antenna units 100a is four, and each conductive middle frame 400 is provided with one antenna unit 100a.

[0059] In the present application, the two adjacent antenna units 100a excite current distributions with intersecting directions on the conductive middle frame 400, and / or the two relatively arranged antenna units 100a have opposite main radiation directions in the far field. The far field refers to an antenna field region where the distribution of the electromagnetic field with angle is basically independent of the antenna distance. In this embodiment, the far field region of the antenna unit 100a is located on the conductive middle frame 400. It should be noted that the main radiation direction of the antenna unit 100a in the subsequent process is the main radiation direction of the antenna unit 100a in the far field.

[0060] See also Figure 4 , taking the multiple antenna units 100a including the first antenna unit 10, the second antenna unit 20, the third antenna unit 30 and the fourth antenna unit 40 as an example.

[0061] See also Figure 5 , the first antenna unit 10 and the second antenna unit 20 are respectively arranged at two adjacent middle frame edges. For example, the first antenna unit 10 is arranged at the first edge 401, and the second antenna unit 20 is arranged at the second edge 402. It can be understood that the first antenna unit 10 is arranged at the middle frame edge, including but not limited to a part of the first antenna unit 10 being arranged outside the middle frame edge, for example, the radiator is arranged outside the middle frame edge (that is, outside the conductive middle frame 400) to increase the clearance space. In addition, another part of the first antenna unit 10 is carried on the conductive middle frame 400, for example, the matching circuit and feed source of the first antenna unit 10 are arranged on the circuit board on the conductive middle frame 400. Among them, the conductive middle frame 400 is a conductive material. Optionally, the conductive middle frame 400 can be used as a reference ground system for the first antenna unit 10. A part of the first antenna unit 10 can be electrically connected to the conductive middle frame 400 to achieve grounding; the first antenna unit 10 is coupled with the reference ground system to excite more radiation energy. The second antenna unit 20 is disposed at the edge of the middle frame. The description of the first antenna unit 10 being disposed at the edge of the middle frame can be referred to, and will not be repeated here.

[0062] The first antenna unit 10 forms a resonant mode when transmitting and receiving the frequency band and excites a resonant current on the first antenna unit 10 and the conductive middle frame 400. Correspondingly, the second antenna unit 20 forms a resonant mode when transmitting and receiving the frequency band and excites a resonant current on the second antenna unit 20 and the conductive middle frame 400.

[0063] The flow direction of the resonant current of the first antenna unit 10 on the conductive middle frame 400 intersects with the flow direction of the resonant current of the second antenna unit 20 on the conductive middle frame 400. The intersection of the flow directions of the resonant current described in the present application includes two flow directions being orthogonal or two flow directions forming an angle of 0°-90° (excluding 0° and 90°) or 90°-180° (excluding 90° and 180°).

[0064] In this embodiment, two antenna units 100a disposed on two adjacent middle frame edges on the conductive middle frame 400 are designed to excite a current distribution with intersecting directions on the conductive middle frame 400, so that the electric field zero point directions of the two antenna units 100a on the conductive middle frame 400 intersect, that is, the electric field polarization directions of the two antenna units 100a in the far field intersect. Wherein, the polarization direction refers to the direction of the electric field strength formed when the antenna radiates. When the electric field polarization directions of the two antenna units 100a in the far field intersect (are different), it means that the electric field strength directions formed by the two antenna units 100a when radiating are different, that is, the energy propagation directions of the two antenna units 100a are different, thereby increasing the spatial independence of the energy radiated by the two antenna units 100a during the transmission process, improving its isolation, reducing its correlation, reducing the mutual interference between the two antenna units 100a, and thereby improving the efficiency of the MIMO antenna system formed by them.

[0065] Similarly, see Figure 4 , the second antenna unit 20 and the third antenna unit 30 are two antenna units 100a at adjacent middle frame edges. For example, the second antenna unit 20 is arranged on the second edge 402, and the third antenna unit 30 is arranged on the third edge 403. The third antenna unit 30 and the fourth antenna unit 40 are two antenna units 100a arranged at adjacent middle frame edges. For example, the third antenna unit 30 is arranged on the third edge 403, and the fourth antenna unit 40 is arranged on the fourth edge 404. The first antenna unit 10 and the fourth antenna unit 40 are two antenna units 100a at adjacent middle frame edges. Current distributions with intersecting flow directions can be formed between the above antenna units 100a. In this way, for the electronic device 1000, there is a lower correlation and a higher isolation between two adjacent antenna units 100a from the first antenna unit 10 to the fourth antenna unit 40.

[0066] Among them, see Figure 4 , the first antenna unit 10 and the third antenna unit 30 are respectively arranged at two opposite middle frame edges. The main radiation direction of the first antenna unit 10 in the far field is opposite to the main radiation direction of the third antenna unit 30 in the far field. By setting the main radiation direction of the first antenna unit 10 to be opposite to the main radiation direction of the second antenna unit 20, the far-field energy distribution direction of the first antenna unit 10 is different from the far-field energy distribution direction of the second antenna unit 20, and the far-field energy distribution area of ​​the first antenna unit 10 and the far-field energy area of ​​the third antenna unit 30 have a small overlap, thereby improving the spatial independence of the first antenna unit 10 and the third antenna unit 30, improving the isolation of the first antenna unit 10 and the second antenna unit 20, reducing the envelope correlation coefficient between the two, and improving the antenna performance of the multi-antenna unit 100a.

[0067] Similarly, see Figure 4The second antenna unit 20 and the fourth antenna unit 40 are respectively arranged at the antenna unit 100a at the opposite middle frame side. The main radiation direction of the second antenna unit 20 is opposite to the main radiation direction of the fourth antenna unit 40, so that the far-field energy distribution direction of the second antenna unit 20 is different from the far-field energy distribution direction of the fourth antenna unit 40, and the isolation between the second antenna unit 20 and the fourth antenna unit 40 is high.

[0068] Through the above design, it is achieved that the antenna units 100a adjacent to each other in the first antenna unit 10 to the fourth antenna unit 40 have lower correlation and higher isolation, thereby improving the performance of the MIMO antenna system formed by the multiple antenna units 100a.

[0069] Of course, in other embodiments, the number of antenna units 100a in the antenna assembly 100 may be two, three, etc. For example, the antenna assembly 100 may include only the first antenna unit 10 and the second antenna unit 20, wherein the first antenna unit 10 and the second antenna unit 20 excite current distributions with intersecting directions on the conductive middle frame 400. The antenna assembly 100 may include only the first antenna unit 10 and the third antenna unit 30, wherein the main radiation directions of the first antenna unit 10 and the third antenna unit 30 are opposite, etc., and examples are not given one by one here.

[0070] The electronic device 1000 provided in the present application, by respectively arranging multiple antenna units 100a on different middle frame edges of a conductive middle frame 400, two adjacent antenna units 100a excite current distributions with intersecting directions on the conductive middle frame 400, so that the electric field polarization directions of the adjacent antenna units 100a intersect in the far field, so as to reduce the correlation between the adjacent antenna units 100a; the main radiation directions of the two relatively arranged antenna units 100a in the far field are opposite, and the main radiation directions of the relatively arranged antenna units 100a are different, so the energy distribution areas of the relatively arranged antenna units 100a in the far field are different, and the overlap is small, so as to reduce the correlation between the relatively arranged antenna units, thereby improving the spatial independence of each antenna unit 100a, improving the isolation between the multiple antenna units 100a, reducing the envelope correlation coefficient between the multiple antenna units 100a, and improving the antenna performance of the multiple antenna units 100a.

[0071] The present application does not make specific limitations on the frequency bands supported by the multiple antenna units 100a. The signal type of the frequency band may be a cellular mobile communication 4G signal or a cellular mobile communication 5G signal. The specific frequency band may be an LB band (low frequency), an MHB band (medium and high frequency), an UHB band (ultra-high frequency), etc. Among them, the LB band refers to a frequency band below 1000MHz (excluding 1000MHz). The MHB band refers to a frequency band of 1000MHz-3000MHz (including 1000MHz, excluding 3000MHz). The UHB band refers to a frequency band of 3000MHz-10000MHz (including 3000MHz). The signal type of the frequency band may also be a Wi-Fi signal, a GNSS signal, a Bluetooth signal, etc. The Wi-Fi band includes but is not limited to at least one of Wi-Fi 2.4G, Wi-Fi 5G, Wi-Fi 6E, etc. GNSS stands for Global Navigation Satellite System, and its Chinese name is Global Navigation Satellite System. GNSS includes the global global positioning system (GPS), Beidou, global navigation satellite system (GLONASS), Galileo satellite navigation system (Galileo) and regional navigation systems.

[0072] Optionally, the electric field polarization directions of two adjacent antenna units 100a in the far field region are orthogonal.

[0073] For details, please refer to Figure 5 , taking the first antenna unit 10 and the second antenna unit 20 arranged on the two adjacent middle frame edges as an example. The flow direction of the resonant current of the first antenna unit 10 on the conductive middle frame 400 is orthogonal to the flow direction of the resonant current of the second antenna unit 20 on the conductive middle frame 400 (that is, the angle is 90°), so as to achieve the orthogonality of the electric field polarization directions of the first antenna unit 10 and the second antenna unit 20 in the far field region, so as to achieve polarization isolation. Of course, the other two antenna units 100a arranged on the two adjacent middle frame edges can also be orthogonal by setting the flow direction of the resonant current on the conductive middle frame 400, so as to achieve the orthogonality of the electric field polarization directions of the two antenna units 100a in the far field region, so as to achieve polarization isolation.

[0074] Optionally, the first antenna unit 10 and the second antenna unit 20 may both include dipole antennas, which can excite currents with purer directions on the conductive middle frame 400. For example, ideally, two dipole antennas arranged on adjacent middle frame edges respectively excite transverse currents and longitudinal currents, so that the current directions of the two adjacent antenna units 100a on the conductive middle frame 400 can be orthogonal, thereby achieving orthogonal electric field polarization directions of the two adjacent antenna units 100a in the far field.

[0075] In this embodiment, two antenna units 100a disposed on two adjacent middle frame edges on the conductive middle frame 400 are designed to excite a current distribution with orthogonal flow directions on the conductive middle frame 400, so that the electric field zero point directions of the two antenna units 100a on the conductive middle frame 400 are orthogonal. Wherein, the polarization direction refers to the direction of the electric field strength formed when the antenna radiates. When the electric field polarization directions of the two antenna units 100a in the far field are orthogonal, it means that the directions of the electric field strength formed by the two antenna units 100a when radiating are orthogonal, that is, the energy propagation directions of the two antenna units 100a are orthogonal, and the polarization isolation of the two antenna units 100a is achieved, thereby increasing the spatial independence of the energy radiated by the two antenna units 100a during the transmission process, reducing its correlation, reducing the data bit error rate demodulated by the receiving end of the MIMO antenna system, and improving its isolation, thereby improving the efficiency of the MIMO antenna system formed by it.

[0076] Among them, see Figure 5 When the first antenna unit 10 resonates, it excites a first current Q1 on the conductive middle frame 400. When the second antenna unit 20 resonates, it excites a second current Q2 on the conductive middle frame 400. The direction of the first current Q1 is perpendicular to the direction of the second current Q2.

[0077] For example, the flow direction of the first current Q1 is along the X-axis direction, not limited to the positive direction of the X-axis or the reverse direction of the X-axis. The flow direction of the second current Q2 is along the Y-axis direction, not limited to the positive direction of the Y-axis or the reverse direction of the Y-axis. Among them, the flow direction of the first current Q1 is perpendicular to the flow direction of the second current Q2. When the first antenna unit 10 excites the flow direction of the first current Q1 on the conductive middle frame 400 along the X-axis direction, the electric field polarization direction of the first antenna unit 10 in the far field is also along the X-axis direction. When the second antenna unit 20 excites the flow direction of the second current Q2 on the conductive middle frame 400 along the Y-axis direction, the electric field polarization direction of the second antenna unit 20 in the far field is also along the Y-axis direction. Therefore, the electric field polarization directions of the first antenna unit 10 and the second antenna unit 20 in the far field are perpendicular.

[0078] The present application does not specifically limit the structure of the antenna unit 100a. The structure of the antenna unit 100a is described below with reference to the accompanying drawings. The first antenna unit 10 is taken as an example.

[0079] See also Figure 6 The first antenna unit 10 includes a first radiator 11, a first matching circuit M1 and a first feed source 12; the first radiator 11 is arranged along the edge of the middle frame (for example, the first edge 401), the first radiator 11 is a dipole radiator, and the first feed point A1 on the first radiator 11 is electrically connected to the first feed source 12 through the first matching circuit M1.

[0080] The first radiator 11 is a port for the first antenna unit 10 to send and receive radio frequency signals, wherein the radio frequency signals are transmitted in the air medium in the form of electromagnetic wave signals. The present application does not specifically limit the shape of the first radiator 11. For example, the shape of the first radiator 11 includes but is not limited to a strip, a sheet, a rod, a coating, a film, etc. Figure 6 The first radiator 11 shown is only an example and does not limit the shape of the first radiator 11 provided in the present application. Optionally, the first radiator 11 can be integrated with the conductive frame, that is, the first radiator 11 is a frame antenna (or a middle frame antenna). Optionally, the antenna formed by the first radiator 11 is a bracket antenna. Among them, the bracket antenna includes but is not limited to a flexible circuit board antenna formed on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct structured antenna by laser direct structured (Laser Direct Structuring, LDS), a printed direct structured antenna by printing direct structured (Print Direct Structuring, PDS), a conductive sheet antenna, etc.

[0081] Optionally, the material of the first radiator 11 is a conductive material, and the specific material includes but is not limited to metals such as copper, gold, silver, or alloys formed by copper, gold, silver, or alloys formed by copper, gold, silver and other materials; graphene, or a conductive material formed by combining graphene with other materials; oxide conductive materials such as indium tin oxide; mixed materials formed by carbon nanotubes and polymers, etc.

[0082] See also Figure 6 The first radiator 11 further includes a first free end 111 and a second free end 112 disposed on opposite sides of the first feed point A1. The first free end 111 and the second free end 112 are both spaced apart from the edge of the middle frame, and the first radiator 11 is a metal suspension branch relative to the conductive middle frame 400 to form a dipole radiator.

[0083] See also Figure 6 , the first feed source 12 is electrically connected to the first feed point A1. The first feed source 12 includes but is not limited to a port electrically connected to a radio frequency transceiver chip, or a radio frequency transceiver chip. The first feed source 12 is disposed on the main board of the electronic device 1000. The main board of the electronic device 1000 is disposed on the conductive middle frame 400.

[0084] The first matching circuit M1 is disposed on the main board of the electronic device 1000, one end of the first matching circuit M1 is electrically connected to the first feed point A1, and the other end of the first matching circuit M1 is electrically connected to the first feed source 12. The first matching circuit M1 is used to tune the frequency band supported by the first radiator 11. The first matching circuit M1 includes but is not limited to a capacitor, an inductor, a capacitor-inductor combination, a switch tuning device, and the like.

[0085] The electrical connection method of the first matching circuit M1 to the first feeding point A1 includes but is not limited to direct welding, or indirect electrical connection through coaxial lines, microstrip lines, conductive springs, conductive adhesives, etc. In this embodiment, the first feeding point A1 is electrically connected to the first matching circuit M1 through a conductive member (such as a conductive spring).

[0086] The RF signal emitted by the first feed source 12 is fed into the first radiator 11 via the first feed point A1. The RF signal can excite the first radiator 11 to generate a resonant current and form a resonance to support the frequency band corresponding to the resonant current. Of course, the first feed source 12 can also receive the RF signal through the first radiator 11 via the first feed point A1. The first feed source 12 is used to excite the first radiator 11 to transmit and receive at least one of the LB band, MHB band, UHB band, Wi-Fi band, and GNSS band.

[0087] When the first antenna unit 10 resonates, the current excited on the first radiator 11 flows from the first free end 111 to the second free end 112 , or flows from the second free end 112 to the first free end 111 .

[0088] The first radiator 11 is arranged along the first side 401. The present application does not specifically limit the length of the first radiator 11. The resonant current formed by the first antenna unit 10 on the first radiator 11 flows between the first free end 111 and the second free end 112. When the first side 401 is arranged along the X-axis direction, the resonant current formed by the first antenna unit 10 on the first radiator 11 flows along the X-axis direction.

[0089] Among them, see Figure 6The direction of the current excited by the first antenna unit 10 on the conductive middle frame 400 is opposite to the direction of the current excited by the first antenna unit 10 on the first radiator 11 .

[0090] When the resonant current formed by the first antenna unit 10 on the first radiator 11 flows along the X-axis direction, the first antenna unit 10 forms a main resonant current along the X-axis direction on the conductive middle frame 400, and the direction of the main resonant current of the first antenna unit 10 on the conductive middle frame 400 is opposite to the direction of the resonant current formed by the first antenna unit 10 on the first radiator 11. For example, when the resonant current formed by the first antenna unit 10 on the first radiator 11 is a resonant current in the reverse direction of the X-axis, the direction of the main resonant current of the first antenna unit 10 on the conductive middle frame 400 is along the positive direction of the X-axis.

[0091] Since the first radiator 11 of the first antenna unit 10 is a dipole radiator, the resonant mode of the dipole radiator is a balanced mode. The dipole radiator can excite a more pure current flow direction on the conductive middle frame 400. For example, the current distribution along the X-axis direction is much greater than the current distribution along the Y-axis direction, or the first radiator 11 mainly excites the current distribution along the X-axis direction on the conductive middle frame 400. In this way, the equivalent current direction of the first antenna unit 10 on the conductive middle frame 400 is also along the X-axis direction, and the direction of the far-field electric field zero point is also along the X-axis direction.

[0092] Optional, see Figure 6 , the current excited by the first antenna unit 10 on the first radiator 11 when resonating operates in a 1 / 2 wavelength mode between the first free end 111 and the second free end 112 (see Figure 6 The arc portion on the first radiator 11 in the middle), that is, the first radiator 11 is a half-wave dipole to form a resonant current from the first free end 111 to the second free end 112.

[0093] The present application does not specifically limit the position of the first feeding point A1 on the first radiator 11. It can be understood that the first feeding point A1 can be located near the first free end 111 or the second free end 112.

[0094] When the first feeding point A1 is close to the first free end 111 or the second free end 112, the location of the first feeding point A1 is a current weak point, which has relatively high impedance matching requirements.

[0095] Optionally, the first matching circuit M1 includes a capacitor device. The capacitance value of the capacitor device is less than the preset capacitance value. In other words, the first matching circuit M1 can perform small capacitance feeding to the first feeding point A1. Since the resonant current flows from the first free end 111 to the second free end 112 from the current weak point to the current strong point and then to the current weak point, the current intensity of the first feeding point A1 near the free end is relatively small, so the required impedance is relatively large, so the impedance matching requirement of the first feeding point A1 is relatively high, and the first matching circuit M1 can be set to a small capacitor to match the impedance of the first feeding point A1. Among them, there is no specific limitation on the preset capacitance value, for example, 1pF, etc., mainly to stimulate the frequency band actually required to be supported.

[0096] See also Figure 6 The first radiator 11 further includes a first tuning point B1. The first tuning point B1 is located between the first feed point A1 and the first free end 111 or between the first feed point A1 and the second free end 112. The first antenna unit 10 further includes a first switching circuit T1. The first switching circuit T1 is electrically connected to the first tuning point B1, and the first switching circuit T1 is used to switch the frequency band supported by the first antenna unit 10.

[0097] The present application does not limit the specific position of the first tuning point B1. Optionally, the first feed point A1 is disposed close to the first free end 111, and the first tuning point B1 is disposed close to the second free end 112, so as to tune the effective electrical length on the first radiator 11, and further tune the frequency band supported by the first antenna unit 10.

[0098] Optional, see Figure 6 The first antenna unit 10 further includes a first switching circuit T1. The first switching circuit T1 may be a switch switching circuit.

[0099] See also Figure 7, the first switching circuit T1 includes at least one switching switch K1 and a plurality of regulating circuits T11. The control end of the switching switch K1 is electrically connected to the controller, and the selection end of at least one of the switching switch K1 can be selectively electrically connected to one of the plurality of regulating circuits T11, and the other ends of the plurality of regulating circuits T11 are all grounded. The switching switch K1 is electrically connected to the controller, and the controller controls the selection end of the switching switch K1 to selectively be electrically connected to one of the plurality of regulating circuits T11. It can be understood that the impedance values ​​of different regulating circuits T11 are different, for example, the plurality of regulating circuits T11 are a plurality of capacitors with different capacitance values, or the plurality of regulating circuits T11 are a plurality of inductors with different inductance values. When the switching switch K1 is switched to electrically connect to a different regulating circuit T11 under the action of the controller, the impedance value to the ground of the first switching circuit T1 is different, thereby adjusting the equivalent electrical length of the first switching circuit T1, and further adjusting the sum of the equivalent electrical length of the first switching circuit T1 and the electrical length of the first radiator 11, thereby tuning the frequency band supported by the first radiator 11.

[0100] Optionally, the switch K1 may be a single-pole multi-throw switch. Optionally, there are multiple switches K1, one end of each switch K1 is electrically connected to the first radiator 11, and the other ends of the multiple switches K1 are electrically connected to the multiple adjustment circuits T11, respectively, and the multiple adjustment circuits T11 are selected by controlling the conduction and disconnection of the multiple switches K1.

[0101] Optionally, one of the adjustment circuits T11 can be a capacitor or an inductor, a series device of a capacitor and an inductor, a parallel device of a capacitor and an inductor, the above series device in parallel with a capacitor, the above series device in parallel with an inductor, two of the above series devices in parallel, two of the above parallel devices in series, and so on. Of course, in other embodiments, the first switching circuit T1 may include an adjustable capacitor. Among them, since the capacitance value of the adjustable capacitor is adjustable, there is no need to additionally set the first switching circuit T1 to switch and select different adjustment circuits T11. Of course, in other embodiments, at least one adjustment circuit T11 can be set as an adjustable capacitor.

[0102] The first feed source 12 couples the electromagnetic energy to the first radiator 11 (metal suspension branch) through the first matching circuit M1 (small capacitor), and the first switching circuit T1 is composed of a radio frequency switch and lumped capacitor and inductor elements, which is responsible for switching the corresponding frequency band required to work for the first antenna unit 10. This antenna solution takes the NR N28 frequency band (703-788MHz) as an example, but is not limited to this frequency band, and is also applicable to NR N5 / 8 and other frequency bands.

[0103] See also Figure 6 , when the first antenna unit 10 generates a resonant mode, the resonant current distribution on the conductive middle frame 400 includes at least a first current Q1 along a first direction. The first direction is the extension direction of the first side 401, that is, the X-axis direction. It can be understood that the equivalent current direction of the first antenna unit 10 is along the X-axis direction, and the electric field polarization direction of the first antenna unit 10 in the far field is along the X-axis direction.

[0104] See also Figure 8 , Figure 8 is the far-field pattern of the first antenna unit 10. The far-field pattern of the first antenna unit 10 shows the radiation area in the main radiation direction of the first antenna unit 10. From the far-field pattern of the first antenna unit 10, it can be seen that the radiation area in the main radiation direction of the first antenna unit 10 (the darker part) is biased towards the positive direction of the Y axis.

[0105] The structure of the second antenna unit 20 may refer to the structure of the first antenna unit 10. Optionally, the structure of the second antenna unit 20 is the same as that of the first antenna unit 10.

[0106] The specific structure of the second antenna unit 20 is described below with reference to the accompanying drawings.

[0107] See also Fig. 9 The second antenna unit 20 includes a second radiator 21, a second matching circuit M2 and a second feed source 22.

[0108] The second radiator 21 may refer to the detailed description of the first radiator 11 , the second matching circuit M2 may refer to the detailed description of the first matching circuit M1 , and the second feed source 22 may refer to the detailed description of the first feed source 12 .

[0109] Optionally, the shape of the first radiator 11 may be the same as that of the second radiator 21 , that is, the second radiator 21 is also a dipole antenna.

[0110] See also Fig. 9 The second radiator 21 includes a third free end 211, a second feed point A2 and a fourth free end 212 arranged in sequence. The second feed point A2 is electrically connected to the second feed source 22 through the second matching circuit M2. The specific connection method between the second radiator 21, the second matching circuit M2 and the second feed source 22 can refer to the specific connection method between the first radiator 11, the first matching circuit M1 and the first feed source 12.

[0111] When the second antenna unit 20 resonates, the current excited on the second radiator 21 flows from the third free end 211 to the fourth free end 212 , or flows from the fourth free end 212 to the third free end 211 .

[0112] The second radiator 21 is arranged along the second side 402. The present application does not specifically limit the length of the second radiator 21. The resonant current formed by the second antenna unit 20 on the second radiator 21 flows between the third free end 211 and the fourth free end 212. When the second side 402 is arranged along the Y-axis direction, the resonant current formed by the second antenna unit 20 on the second radiator 21 flows along the Y-axis direction.

[0113] The direction of the current excited by the second antenna unit 20 on the conductive middle frame 400 is opposite to the direction of the current excited by the second antenna unit 20 on the second radiator 21 .

[0114] When the resonant current formed by the second antenna unit 20 on the second radiator 21 flows along the Y-axis direction, the second antenna unit 20 forms a main resonant current along the Y-axis direction on the conductive middle frame 400, and the direction of the main resonant current of the second antenna unit 20 on the conductive middle frame 400 is opposite to the direction of the resonant current formed by the second antenna unit 20 on the second radiator 21. For example, when the resonant current formed by the second antenna unit 20 on the second radiator 21 is a resonant current in the reverse direction of the Y-axis, the direction of the main resonant current of the second antenna unit 20 on the conductive middle frame 400 is along the positive direction of the Y-axis.

[0115] Since the second radiator 21 of the second antenna unit 20 is a dipole radiator, the resonant mode of the dipole radiator is a balanced mode. The dipole radiator can excite a more pure current flow direction on the conductive middle frame 400. For example, the current distribution along the Y-axis direction is much greater than the current distribution along the X-axis direction, or the second radiator 21 mainly excites the current distribution along the Y-axis direction on the conductive middle frame 400. In this way, the equivalent current direction of the second antenna unit 20 on the conductive middle frame 400 is also along the Y-axis direction, and the direction of the far-field electric field zero point is also along the Y-axis direction. The electric field polarization direction of the second antenna unit 20 in the far field region is along the Y-axis direction.

[0116] Optional, see Fig. 9 The current excited by the second antenna unit 20 on the second radiator 21 when resonating operates in a 1 / 2 wavelength mode between the third free end 211 and the fourth free end 212 (see Fig. 9 The arc line above the second radiator 21 in the middle), that is, the second radiator 21 is a half-wave dipole to form a resonant current from the third free end 211 to the fourth free end 212.

[0117] See also Fig. 9 , the second radiator 21 also includes a second tuning point B2. The second tuning point B2 is located between the second feed point A2 and the third free end 211 or between the second feed point A2 and the fourth free end 212. The second antenna unit 20 also includes a second switching circuit T2. The second switching circuit T2 is electrically connected to the second tuning point B2, and the second switching circuit T2 is used to switch the frequency band supported by the second antenna unit 20. The structure of the second switching circuit T2 can refer to the structure of the first switching circuit T1.

[0118] The present application obtains good ECC through a balanced mode antenna unit 100a solution and a reasonable layout, wherein the balanced mode refers to the current flowing from one free end of the radiator to the other free end, and is a 1 / 2 wavelength mode.

[0119] The present application performs capacitive coupling feeding at the metal suspension branch (radiator) near the free end through a matching circuit, that is, half-wavelength resonance of the metal suspension branch can be excited. Taking the first antenna unit 10 and the second antenna unit 20 as an example, the current of the first antenna unit 10 is distributed along the X-axis direction on the metal suspension branch (first radiator 11) and the conductive middle frame 400, and is distributed in a half-wavelength between the first free end 111 and the second free end 112. The current of the second antenna unit 20 is distributed along the Y-axis direction on the suspension branch (second radiator 21) and the conductive middle frame 400, and is distributed in a half-wavelength at the third free end 211 and the fourth free end 212.

[0120] See also Fig.10 , Fig.10 is the far-field pattern of the second antenna unit 20. The far-field pattern of the second antenna unit 20 shows the radiation area in the main radiation direction of the second antenna unit 20. From the far-field pattern of the second antenna unit 20, it can be seen that the radiation area in the main radiation direction of the second antenna unit 20 (the darker part) is biased towards the positive direction of the X-axis.

[0121] When the first antenna unit 10 and the second antenna unit 20 are both used as a MIMO antenna system, the electric field polarization direction of the first antenna unit 10 in the far field is orthogonal to the electric field polarization direction of the second antenna unit 20 in the far field. The directions of the electric field strengths formed by the first antenna unit 10 and the second antenna unit 20 during radiation are orthogonal, that is, the energy propagation directions of the first antenna unit 10 and the second antenna unit 20 are orthogonal, thereby achieving polarization isolation of the first antenna unit 10 and the second antenna unit 20, thereby increasing the spatial independence of the energy radiated by the first antenna unit 10 and the second antenna unit 20 during transmission, reducing their correlation, reducing the data bit error rate demodulated at the receiving end of the MIMO antenna system, improving its isolation, and thereby improving the efficiency of the MIMO antenna system formed thereby.

[0122] Fig.11 is a reflection coefficient curve of the first antenna unit 10 and the second antenna unit 20 . Fig.11 In the figure, curve S1 is the first antenna unit 10 (i.e. Fig.11 Curve S2 is the isolation curve between the first antenna unit 10 and the second antenna unit 20; Curve S3 is the second antenna unit 20 (i.e. Fig.11 The reflection coefficient curve of the left antenna in Figure 1 is shown in Figure 2. Fig.11 It can be seen that the first antenna unit 10 (i.e. Fig.11 The working bandwidth of the second antenna unit 20 (i.e., the top antenna in the figure) is relatively narrow, and the reflection coefficient is less than -5.1dB within 758-788MHz; Fig.11 The working bandwidth of the left antenna in the figure is relatively wide, and the reflection coefficient is less than -4.5dB in the range of 703-788MHz. This shows that both the first antenna unit 10 and the second antenna unit 20 can support the N28 frequency band. At the same time, the isolation between the first antenna unit 10 and the second antenna unit 20 is less than -20dB, which shows that the first antenna unit 10 and the second antenna unit 20 have excellent spatial correlation.

[0123] Fig.12 is a radiation performance curve of the first antenna unit 10 and the second antenna unit 20 . Fig.12 In the figure, curve S4 is the first antenna unit 10 (i.e. Fig.12 Curve S5 is the radiation efficiency curve of the first antenna unit 10 (i.e. Fig.12 Curve S6 is the system efficiency curve of the second antenna unit 20 (i.e. Fig.12 Curve S5 is the radiation efficiency curve of the second antenna unit 20 (i.e. Fig.12 The system efficiency curve of the left antenna in Figure 1 is shown in Figure 2. Fig.12It can be seen that the radiation performance of the first antenna unit 10 has an average system efficiency of about -8.2 dB in the range of 758-788 MHz, and the radiation performance of the second antenna unit 20 has an average system efficiency of about -3 dB in the range of 703-788 MHz, indicating that both the first antenna unit 10 and the second antenna unit 20 have good radiation efficiency.

[0124] The specific structure of the third antenna unit 30 is described below with reference to the accompanying drawings.

[0125] See also Fig.13 The third antenna unit 30 includes a third radiator 31, a third matching circuit M3 and a third feed source 32.

[0126] The third radiator 31 may refer to the detailed description of the first radiator 11 , the third matching circuit M3 may refer to the detailed description of the first matching circuit M1 , and the third feed source 32 may refer to the detailed description of the first feed source 12 .

[0127] Optionally, the shape of the first radiator 11 may be the same as that of the third radiator 31 , that is, the third radiator 31 is also a dipole antenna.

[0128] See also Fig.13 The third radiator 31 includes a fifth free end 311, a third feed point A3 and a sixth free end 312 arranged in sequence. The third feed point A3 is electrically connected to the third feed source 32 through the third matching circuit M3. The specific connection method between the third radiator 31, the third matching circuit M3 and the third feed source 32 can refer to the specific connection method between the first radiator 11, the first matching circuit M1 and the first feed source 12.

[0129] When the third antenna unit 30 resonates, the current excited on the third radiator 31 flows from the fifth free end 311 to the sixth free end 312 , or flows from the sixth free end 312 to the fifth free end 311 .

[0130] The third radiator 31 is arranged along the third side 403. The present application does not specifically limit the length of the third radiator 31. The resonant current formed by the third antenna unit 30 on the third radiator 31 flows between the fifth free end 311 and the sixth free end 312. When the third side 403 is arranged along the X-axis direction, the resonant current formed by the third antenna unit 30 on the third radiator 31 flows along the X-axis direction.

[0131] The direction of the current excited by the third antenna unit 30 on the conductive middle frame 400 is opposite to the direction of the current excited by the third antenna unit 30 on the third radiator 31 .

[0132] See also Fig.13When the third antenna unit 30 resonates, it excites a third current Q3 on the conductive middle frame 400. The direction of the third current Q3 is opposite to the direction of the first current Q1. The direction of the third current Q3 is perpendicular to the direction of the second current Q2.

[0133] When the resonant current formed by the third antenna unit 30 on the third radiator 31 flows along the X-axis direction, the third antenna unit 30 forms a main resonant current along the X-axis direction on the conductive middle frame 400, and the direction of the main resonant current of the third antenna unit 30 on the conductive middle frame 400 is opposite to the direction of the resonant current formed by the third antenna unit 30 on the third radiator 31. For example, when the resonant current formed by the third antenna unit 30 on the third radiator 31 is a resonant current along the positive direction of the X-axis, the direction of the main resonant current of the third antenna unit 30 on the conductive middle frame 400 is opposite along the X-axis.

[0134] Since the third radiator 31 of the third antenna unit 30 is a dipole radiator, the resonant mode of the dipole radiator is a balanced mode. The dipole radiator can excite a current with a purer direction on the conductive middle frame 400. For example, the current distribution along the X-axis direction is much greater than the current distribution along the X-axis direction, or the third radiator 31 mainly excites the current distribution along the X-axis direction on the conductive middle frame 400. In this way, the equivalent current direction of the third antenna unit 30 on the conductive middle frame 400 is also along the X-axis direction, and the direction of the far-field electric field zero point is also along the X-axis direction.

[0135] Optionally, when the third antenna unit 30 resonates, the current excited on the third radiator 31 operates in a 1 / 2 wavelength mode between the fifth free end 311 and the sixth free end 312, that is, the third radiator 31 is a half-wave dipole to form a resonant current from the fifth free end 311 to the sixth free end 312.

[0136] See also Fig.13 , the third radiator 31 also includes a third tuning point B3. The third tuning point B3 is located between the third feed point A3 and the fifth free end 311 or between the third feed point A3 and the sixth free end 312. The third antenna unit 30 also includes a third switching circuit T3. The third switching circuit T3 is electrically connected to the third tuning point B3, and the third switching circuit T3 is used to switch the frequency band supported by the third antenna unit 30. The structure of the third switching circuit T3 can refer to the structure of the first switching circuit T1.

[0137] See also Fig.14 , Fig.14: is the far-field pattern of the third antenna unit 30. The far-field pattern of the third antenna unit 30 shows the radiation area in the main radiation direction of the third antenna unit 30. From the far-field pattern of the third antenna unit 30, it can be seen that the radiation area in the main radiation direction of the third antenna unit 30 (the darker part) is biased in the opposite direction of the Y axis.

[0138] When the third antenna unit 30 and the second antenna unit 20 are both used as a MIMO antenna system, the electric field polarization direction of the third antenna unit 30 in the far field is orthogonal to the electric field polarization direction of the second antenna unit 20 in the far field. The directions of the electric field strengths formed by the third antenna unit 30 and the second antenna unit 20 during radiation are orthogonal, that is, the energy propagation directions of the third antenna unit 30 and the second antenna unit 20 are orthogonal, thereby achieving polarization isolation of the third antenna unit 30 and the second antenna unit 20, thereby increasing the spatial independence of the energy radiated by the third antenna unit 30 and the second antenna unit 20 during transmission, reducing their correlation, reducing the data bit error rate demodulated at the receiving end of the MIMO antenna system, improving its isolation, and thereby improving the efficiency of the MIMO antenna system formed thereby.

[0139] When the third antenna unit 30 and the first antenna unit 10 are both used as a MIMO antenna system, the main radiation direction of the third antenna unit 30 is opposite to the main radiation direction of the first antenna unit 10, and the radiation area of ​​the third antenna unit 30 is different from the radiation area of ​​the main radiation direction of the first antenna unit 10 and the overlap is small. The energy distribution of the third antenna unit 30 and the first antenna unit 10 in their respective main radiation directions is small, which increases the spatial independence of the energy radiated by the third antenna unit 30 and the first antenna unit 10 during the transmission process, which is conducive to forming a low envelope correlation coefficient, reducing the data bit error rate demodulated by the receiving end of the MIMO antenna system, improving its isolation, and thereby improving the efficiency of the MIMO antenna system formed thereby.

[0140] The specific structure of the fourth antenna unit 40 is described below with reference to the accompanying drawings.

[0141] See also Fig.15 The fourth antenna unit 40 includes a fourth radiator 41, a fourth matching circuit M4 and a fourth feed source 42.

[0142] The fourth radiator 41 may refer to the detailed description of the first radiator 11 , the fourth matching circuit M4 may refer to the detailed description of the first matching circuit M1 , and the fourth feed source 42 may refer to the detailed description of the first feed source 12 .

[0143] Optionally, the shape of the first radiator 11 may be the same as that of the fourth radiator 41 , that is, the fourth radiator 41 is also a dipole antenna.

[0144] See also Fig.15 The fourth radiator 41 includes a seventh free end 411, a fourth feed point A4 and an eighth free end 412 arranged in sequence. The fourth feed point A4 is electrically connected to the fourth feed source 42 through the fourth matching circuit M4. The specific connection method between the fourth radiator 41, the fourth matching circuit M4 and the fourth feed source 42 can refer to the specific connection method between the first radiator 11, the first matching circuit M1 and the first feed source 12.

[0145] When the fourth antenna unit 40 resonates, the current excited on the fourth radiator 41 flows from the seventh free end 411 to the eighth free end 412 , or flows from the eighth free end 412 to the seventh free end 411 .

[0146] The fourth radiator 41 is arranged along the fourth side 404. The present application does not specifically limit the length of the fourth radiator 41. The resonant current formed by the fourth antenna unit 40 on the fourth radiator 41 flows between the seventh free end 411 and the eighth free end 412. When the fourth side 404 is arranged along the X-axis direction, the resonant current formed by the fourth antenna unit 40 on the fourth radiator 41 flows along the X-axis direction.

[0147] The direction of the current excited by the fourth antenna unit 40 on the conductive middle frame 400 is opposite to the direction of the current excited by the fourth antenna unit 40 on the fourth radiator 41 .

[0148] See also Fig.15 When the fourth antenna unit 40 resonates, it excites a fourth current Q4 on the conductive middle frame 400. The direction of the fourth current Q4 is opposite to the direction of the first current Q1. The direction of the fourth current Q4 is perpendicular to the direction of the second current Q2.

[0149] When the resonant current formed by the fourth antenna unit 40 on the fourth radiator 41 flows along the Y-axis direction, the fourth antenna unit 40 forms a main resonant current along the Y-axis direction on the conductive middle frame 400, and the direction of the main resonant current of the fourth antenna unit 40 on the conductive middle frame 400 is opposite to the direction of the resonant current formed by the fourth antenna unit 40 on the fourth radiator 41. For example, when the resonant current formed by the fourth antenna unit 40 on the fourth radiator 41 is a resonant current along the positive direction of the Y-axis, the direction of the main resonant current of the fourth antenna unit 40 on the conductive middle frame 400 is opposite along the Y-axis.

[0150] Since the fourth radiator 41 of the fourth antenna unit 40 is a dipole radiator, the resonant mode of the dipole radiator is a balanced mode. The dipole radiator can excite a current with a purer direction on the conductive middle frame 400. For example, the current distribution along the Y-axis direction is much greater than the current distribution along the Y-axis direction, or the fourth radiator 41 mainly excites the current distribution along the Y-axis direction on the conductive middle frame 400. In this way, the equivalent current direction of the fourth antenna unit 40 on the conductive middle frame 400 is also along the Y-axis direction, and the direction of the far-field electric field zero point is also along the Y-axis direction.

[0151] Optionally, when the fourth antenna unit 40 resonates, the current excited on the fourth radiator 41 operates in a 1 / 2 wavelength mode between the seventh free end 411 and the eighth free end 412, that is, the fourth radiator 41 is a half-wave dipole to form a resonant current from the seventh free end 411 to the eighth free end 412.

[0152] See also Fig.15 , the fourth radiator 41 also includes a fourth tuning point B4. The fourth tuning point B4 is located between the fourth feed point A4 and the seventh free end 411 or between the fourth feed point A4 and the eighth free end 412. The fourth antenna unit 40 also includes a fourth switching circuit T4. The fourth switching circuit T4 is electrically connected to the fourth tuning point B4, and the fourth switching circuit T4 is used to switch the frequency band supported by the fourth antenna unit 40. The structure of the fourth switching circuit T4 can refer to the structure of the first switching circuit T1.

[0153] See also Fig.16 , Fig.16 : is the far-field pattern of the fourth antenna unit 40. The far-field pattern of the fourth antenna unit 40 shows the radiation area in the main radiation direction of the fourth antenna unit 40. From the far-field pattern of the fourth antenna unit 40, it can be seen that the radiation area in the main radiation direction of the fourth antenna unit 40 (the darker part) is biased in the opposite direction of the X-axis.

[0154] When the fourth antenna unit 40 and the first antenna unit 10 (or the third antenna unit 30) are both used as a MIMO antenna system, the electric field polarization direction of the fourth antenna unit 40 in the far field is orthogonal to the electric field polarization direction of the first antenna unit 10 (or the third antenna unit 30) in the far field. The directions of the electric field strengths formed by the fourth antenna unit 40 and the first antenna unit 10 (or the third antenna unit 30) during radiation are orthogonal, that is, the energy propagation directions of the fourth antenna unit 40 and the first antenna unit 10 (or the third antenna unit 30) are orthogonal, thereby achieving polarization isolation between the fourth antenna unit 40 and the first antenna unit 10 (or the third antenna unit 30), thereby increasing the spatial independence of the energy radiated by the fourth antenna unit 40 and the first antenna unit 10 (or the third antenna unit 30) during transmission, reducing their correlation, reducing the data bit error rate demodulated by the receiving end of the MIMO antenna system, improving its isolation, and thereby improving the efficiency of the MIMO antenna system formed by it.

[0155] When the fourth antenna unit 40 and the second antenna unit 20 are both used as a MIMO antenna system, the main radiation direction of the fourth antenna unit 40 is opposite to the main radiation direction of the second antenna unit 20, the radiation area of ​​the fourth antenna unit 40 is different from the radiation area of ​​the main radiation direction of the second antenna unit 20 and the overlap is small, the fourth antenna unit 40 and the second antenna unit 20 have less energy distribution in their respective main radiation directions, which increases the spatial independence of the energy radiated by the fourth antenna unit 40 and the second antenna unit 20 during the transmission process, which is conducive to forming a low envelope correlation coefficient, reducing the data bit error rate demodulated by the receiving end of the MIMO antenna system, improving its isolation, and thereby improving the efficiency of the MIMO antenna system formed thereby.

[0156] See also Fig.17 , taking the first antenna unit 10 to the fourth antenna unit 40 as an example, two adjacent antenna units among the first antenna unit 10, the second antenna unit 20, the third antenna unit 30 and the fourth antenna unit 40 form a first antenna unit group 10a, and the other two adjacent antenna units form a second antenna unit group 20a. For example, the first antenna unit 10 and the second antenna unit 20 can form the first antenna unit group 10a, and the third antenna unit 30 and the fourth antenna unit 40 can form the second antenna unit group 20a. Of course, in other embodiments, the second antenna unit 20 and the third antenna unit 30 can form the first antenna unit group 10a, and the fourth antenna unit 40 and the first antenna unit 10 can form the second antenna unit group 20a.

[0157] The electronic device 1000 further includes at least one radio frequency module. The radio frequency module is electrically connected to at least one of the plurality of antenna units 100a. The radio frequency module is used to provide an excitation signal for the antenna unit 100a. Optionally, the radio frequency module includes but is not limited to a radio frequency transceiver chip.

[0158] In an optional implementation of the first RF module, please refer to Fig.17 , the at least one RF module includes a first RF module 510 and a second RF module 520. The first RF module 510 is electrically connected to the first antenna unit group 10a, and the second RF module 520 is electrically connected to the second antenna unit group 20a. For example, the first RF module 510 is electrically connected to the first antenna unit 10 and the second antenna unit 20. The first RF module 510 can control the first antenna unit 10 and the second antenna unit 20 to transmit and receive the same frequency band at the same time. The second RF module 520 is electrically connected to the third antenna unit 30 and the fourth antenna unit 40. The second RF module 520 can control the third antenna unit 30 and the fourth antenna unit 40 to transmit and receive the same frequency band at the same time.

[0159] In the implementation of the first control mode, the electronic device 1000 further includes a controller (not shown). The controller is electrically connected to the first RF module 510 and the second RF module 520. The controller is used to control the first RF module 510 and the second RF module 520 to excite the multiple antenna units 100a (i.e., the first antenna unit 10 to the fourth antenna unit 40) to form a 4*4 MIMO antenna system, that is, the controller controls the first RF module 510 and the second RF module 520 to simultaneously input the same RF signal to the first antenna unit 10, the second antenna unit 20, the third antenna unit 30 and the fourth antenna unit 40, so that the first antenna unit 10 to the fourth antenna unit 40 support the same frequency band to form a 4*4 MIMO antenna system.

[0160] In the implementation of the second control method, the main difference between this control method and the first control method is that the controller controls the first RF module 510 or the second RF module 520 to excite the 2*2 MIMO antenna system formed by the first antenna unit group 10a or the second antenna unit group 20a. For example, the controller controls the first RF module 510 to input the same RF signal to the first antenna unit 10 and the second antenna unit 20 at the same time, and the second RF module 520 does not work, so that the first antenna unit 10 and the second antenna unit 20 support the same frequency band to form a 2*2 MIMO antenna system. For another example, the controller controls the second RF module 520 to input the same RF signal to the third antenna unit 30 and the fourth antenna unit 40 at the same time, and the first RF module 510 does not work, so that the third antenna unit 30 and the fourth antenna unit 40 support the same frequency band to form a 2*2 MIMO antenna system.

[0161] In an optional implementation of the second RF module, please refer to Fig.18 The first antenna unit 10 and the third antenna unit 30 form a third antenna unit group 30a, and the second antenna unit 20 and the fourth antenna unit 40 form a fourth antenna unit group 40a.

[0162] See also Fig.18 , the at least one RF module includes a first RF module 510 and a second RF module 520. The first RF module 510 is electrically connected to the third antenna unit group 30a, and the second RF module 520 is electrically connected to the fourth antenna unit group 40a. For example, the first RF module 510 is electrically connected to the first antenna unit 10 and the third antenna unit 30. The first RF module 510 can control the first antenna unit 10 and the third antenna unit 30 to transmit and receive the same frequency band at the same time. The second RF module 520 is electrically connected to the second antenna unit 20 and the fourth antenna unit 40. The second RF module 520 can control the second antenna unit 20 and the fourth antenna unit 40 to transmit and receive the same frequency band at the same time.

[0163] In this embodiment, the control method of the RF module can refer to the control method of the first RF module, that is, the controller can control the first RF module 510 and the second RF module 520 to simultaneously input the same RF signal to the first antenna unit 10, the second antenna unit 20, the third antenna unit 30 and the fourth antenna unit 40, so that the first antenna unit 10 to the fourth antenna unit 40 support the same frequency band to form a 4*4 MIMO antenna system; or, control one of the first RF module 510 and the second RF module 520 to work to form a 2*2 MIMO antenna system, for example, the controller controls the first RF module 510 to simultaneously input the same RF signal to the first antenna unit 10 and the third antenna unit 30, and the second RF module 520 does not work, so that the first antenna unit 10 and the third antenna unit 30 support the same frequency band to form a 2*2 MIMO antenna system.

[0164] In an optional implementation of the third RF module, please refer to Fig.19 , the electronic device 1000 also includes a switch and a controller. The switch is electrically connected between the multiple antenna units 100a and at least one of the radio frequency modules. The controller is used to control the switch to electrically connect the radio frequency module to different groups of antenna units. Each group of antenna units includes two adjacent or oppositely arranged antenna units 100a.

[0165] Optionally, one end of the RF module is electrically connected to the connection end of the switching switch, and the selection end of the switching switch is electrically connected to multiple antenna units 100a. For example, the four selection ends of the switching switch are electrically connected to the first antenna unit 10 to the fourth antenna unit 40 respectively, and the controller is electrically connected to the control end of the switching switch to control the connection end of the switching switch to be electrically connected to any one, any two, any three, or four of the four selection ends, so that the antenna assembly 100 can switch between multiple working modes, for example, one antenna unit 100a among the four antenna units 100a works, two adjacent antenna units 100a simultaneously transmit and receive the same frequency band, two opposite antenna units 100a simultaneously transmit and receive the same frequency band, three antenna units 100a simultaneously transmit and receive the same frequency band, and four antenna units 100a simultaneously transmit and receive the same frequency band. Among them, the number of RF modules can be one, two, or more than two, and this application does not limit this.

[0166] The present application embodiment provides a control method of an electronic device 1000, which is applied to the electronic device 1000 described in any of the above embodiments. Fig. 20 , the method comprises at least the following steps.

[0167] Step 100: Receive a trigger signal based on a signal transmission rate or a signal strength.

[0168] Before step 100 , the controller detects the signal strength of the frequency band currently supported by the antenna assembly 100 .

[0169] In step 100, the controller receives the signal strength of the frequency band currently supported by the antenna assembly 100, and compares whether the signal strength is greater than or equal to a preset signal strength, which is a signal strength threshold that satisfies the user to have a good Internet access speed experience.

[0170] When the signal strength of the frequency band currently supported by the antenna assembly 100 is less than or equal to the preset signal strength, a first trigger signal is generated. When the signal strength of the frequency band currently supported by the antenna assembly 100 is greater than the preset signal strength, a second trigger signal is generated.

[0171] Alternatively, before step 100 , the controller detects the signal transmission rate of the frequency band currently supported by the antenna assembly 100 .

[0172] In step 100, the controller receives the signal transmission rate of the frequency band currently supported by the antenna assembly 100, and compares the signal transmission rate with a preset signal transmission rate, wherein the preset signal transmission rate is the signal transmission rate required by the current electronic device 1000 to run an application.

[0173] When the transmission rate of the frequency band currently supported by the antenna assembly 100 is less than or equal to the signal transmission rate, a first trigger signal is generated. When the transmission rate of the frequency band currently supported by the antenna assembly 100 is greater than the signal transmission rate, a second trigger signal is generated.

[0174] Step 200: Control the RF module to excite multiple antenna units 100a to work in a first mode or a second mode according to the trigger signal. The first mode is that the multiple antenna units 100a form a 4*4 MIMO antenna system. The second mode is that the multiple antenna units 100a form a 2*2 MIMO antenna system.

[0175] Here, the multiple antenna units 100a including the first antenna unit 10 to the fourth antenna unit 40 are taken as an example.

[0176] The electronic device 1000 further includes a controller and at least one radio frequency module. The radio frequency module is electrically connected to at least one of the plurality of antenna units 100a. The radio frequency module is used to provide an excitation signal for the antenna unit 100a. Optionally, the radio frequency module includes but is not limited to a radio frequency transceiver chip.

[0177] The controller controls the RF module to provide the same excitation signal to the four antenna units 100a simultaneously according to the received first trigger signal, so that the four antenna units 100a work in the first mode to form a 4*4 MIMO antenna system to ensure that users have a better Internet experience.

[0178] The controller controls the RF module to provide the same excitation signal to the two antenna units 100a at the same time based on the received second trigger signal, so that the two antenna units 100a work in the second mode to form a 2*2 MIMO antenna system, thereby reducing the number of operating antenna units 100a and reducing unnecessary power consumption.

[0179] The above enables the antenna assembly 100 to intelligently switch between a 2*2 MIMO antenna system and a 4*4 MIMO antenna system.

[0180] See also Fig.21 , step 200, controlling the RF module to excite multiple antenna units 100a to operate in the first mode according to the trigger signal, including step 210 or step 220.

[0181] Step 210, according to the trigger signal, control the first RF module 510 to excite the first antenna unit group 10a to work and control the second RF module 520 to excite the second antenna unit group 20a to work, wherein the first antenna unit group 10a includes two adjacently arranged antenna units 100a, and the second antenna unit group 20a includes another two adjacently arranged antenna units 100a.

[0182] For example, please refer to Fig.17 , the first antenna unit 10 and the second antenna unit 20 can form a first antenna unit group 10a, and the third antenna unit 30 and the fourth antenna unit 40 can form a second antenna unit group 20a. Of course, in other embodiments, the second antenna unit 20 and the third antenna unit 30 can form a first antenna unit group 10a, and the fourth antenna unit 40 and the first antenna unit 10 can form a second antenna unit group 20a.

[0183] The at least one RF module includes a first RF module 510 and a second RF module 520. The first RF module 510 is electrically connected to the first antenna unit group 10a, and the second RF module 520 is electrically connected to the second antenna unit group 20a. The first RF module 510 is electrically connected to the first antenna unit 10 and the second antenna unit 20. The first RF module 510 can control the first antenna unit 10 and the second antenna unit 20 to simultaneously transmit and receive the same frequency band. The second RF module 520 is electrically connected to the third antenna unit 30 and the fourth antenna unit 40. The second RF module 520 can control the third antenna unit 30 and the fourth antenna unit 40 to simultaneously transmit and receive the same frequency band.

[0184] The controller is electrically connected to the first RF module 510 and the second RF module 520. The controller is used to control the first RF module 510 and the second RF module 520 to excite the multiple antenna units 100a (i.e., the first antenna unit 10 to the fourth antenna unit 40) to form a 4*4 MIMO antenna system, that is, the controller controls the first RF module 510 and the second RF module 520 to simultaneously input the same RF signal to the first antenna unit 10, the second antenna unit 20, the third antenna unit 30 and the fourth antenna unit 40, so that the first antenna unit 10 to the fourth antenna unit 40 support the same frequency band to form a 4*4 MIMO antenna system.

[0185] See also Fig. 22 , step 220, according to the trigger signal, control the first RF module 510 to excite the third antenna unit group 30a to work and control the second RF module 520 to excite the fourth antenna unit group 40a to work, wherein the third antenna unit group 30a includes two relatively arranged antenna units 100a, and the fourth antenna unit group 40a includes another two relatively arranged antenna units 100a.

[0186] Please refer to Fig.18 The first antenna unit 10 and the third antenna unit 30 may form a third antenna unit group 30a, and the second antenna unit 20 and the fourth antenna unit 40 may form a fourth antenna unit group 40a.

[0187] The first RF module 510 is electrically connected to the third antenna unit group 30a, and the second RF module 520 is electrically connected to the fourth antenna unit group 40. The first RF module 510 is electrically connected to the first antenna unit 10 and the third antenna unit 30. The first RF module 510 can control the first antenna unit 10 and the third antenna unit 30 to simultaneously transmit and receive the same frequency band. The second RF module 520 is electrically connected to the second antenna unit 20 and the fourth antenna unit 40. The second RF module 520 can control the second antenna unit 20 and the fourth antenna unit 40 to simultaneously transmit and receive the same frequency band.

[0188] The controller can control the first RF module 510 and the second RF module 520 to simultaneously input the same RF signal to the first antenna unit 10, the second antenna unit 20, the third antenna unit 30 and the fourth antenna unit 40, so that the first antenna unit 10 to the fourth antenna unit 40 support the same frequency band to form a 4*4 MIMO antenna system.

[0189] See also Fig.23 , step 200, controlling the RF module to excite the multiple antenna units 100a to operate in the second mode according to the trigger signal, including step 230.

[0190] Step 230: Control the radio frequency module to excite the two adjacent or oppositely arranged antenna units 100a to work according to the trigger signal.

[0191] The controller controls the first RF module 510 or the second RF module 520 to excite a group of the first antenna unit group 10a to form a 2*2 MIMO antenna system. For example, the controller controls the first RF module 510 to input the same RF signal to the first antenna unit 10 and the second antenna unit 20 at the same time, and the second RF module 520 does not work, so that the first antenna unit 10 and the second antenna unit 20 support the same frequency band to form a 2*2 MIMO antenna system.

[0192] Fig.24 The ECC performance of the first antenna unit 10 and the second antenna unit 20 in the implementation mode of the first RF module is given in FIG. The ECC coefficient between the first antenna unit 10 and the second antenna unit 20 is less than 0.1 in the N28 receiving frequency band. Since the main radiation directions of the first antenna unit 10 and the second antenna unit 20 are inconsistent and the far-field polarizations are orthogonal, the ECC coefficient between the first antenna unit 10 and the second antenna unit 20 is relatively low. Similarly, since the position arrangement between the third antenna unit 30 and the fourth antenna unit 40 is the same as the position arrangement between the first antenna unit 10 and the second antenna unit 20, the ECC coefficient between the third antenna unit 30 and the fourth antenna unit 40 is also low.

[0193] Fig.25 The ECC performance of the first antenna unit 10 and the third antenna unit 30 in the second RF module implementation is given in FIG. The ECC coefficient between the first antenna unit 10 and the third antenna unit 30 is less than 0.012 in the N28 receiving frequency band. Since the first antenna unit 10 and the third antenna unit 30 are far apart, and the maximum radiation directions of the first antenna unit 10 and the third antenna unit 30 are inconsistent.

[0194] Fig.26The ECC performance of the second antenna unit 20 and the fourth antenna unit 40 in the second implementation of the RF module is given in the figure. The ECC coefficient between the second antenna unit 20 and the fourth antenna unit 40 is less than 0.314 in the N28 receiving frequency band, which can meet the general operator requirements (for example, less than 0.5). Even if the distance between the second antenna unit 20 and the fourth antenna unit 40 is relatively close, less than a quarter wavelength of the working frequency band, the maximum radiation direction (main radiation direction) of the balanced mode half-wave radiator of the second antenna unit 20 and the fourth antenna unit 40 is opposite, so the ECC coefficient between the second antenna unit 100a and the fourth antenna unit 40 can still meet certain requirements.

[0195] Low frequency bands such as the N28 (703-733MHz uplink, 758-788MHz downlink) band, low frequency band communications have the advantages of long coverage distance and good stability. For 5G communication systems, recultivating low frequency band communications is very important. Since this frequency band belongs to a lower frequency band, the space occupied by the antenna is very large for the size of the mobile phone, especially when designing a 4*4 MIMO antenna system that supports the N28 frequency band, the environment is very compact, and the envelope correlation coefficient between the antenna units 100a is poor, about 0.7, which will affect the communication performance of its MIMO system. The present application designs the antenna assembly 100 in the electronic device 1000 as follows, based on improving the performance of the MIMO system, improving the spatial correlation between the multiple antenna units 100a, thereby improving the rank of the MIMO channel matrix, and thus optimizing the throughput of the communication system.

[0196] The design of an antenna assembly 100 in an electronic device 1000 provided in the present application is as follows: The present application provides a 4*4 MIMO antenna system architecture, which is respectively composed of a first antenna unit 10, a second antenna unit 20, a third antenna unit 30 and a fourth antenna unit 40. The first antenna unit 10, the second antenna unit 20, the third antenna unit 30 and the fourth antenna unit 40 are all composed of a matching circuit, a feed source, a metal suspension branch and the metal suspension branch is electrically connected to a conductive middle frame 400. The present application uses a balanced mode metal suspension branch as a low-frequency radiating antenna, which is distributed on both sides and the top and bottom of the metal middle frame of the mobile phone, so that the adjacent antenna units 100a can have an orthogonally polarized far-field distribution, thereby achieving good ECC performance at a close distance; it can also achieve a far-field distribution with opposite main radiation directions for the relatively arranged antenna units 100a, and the ECC of the two low-frequency antennas corresponding to the two sides is about 0.3, which can also meet the needs of operators. In the context of re-cultivation of the low-frequency golden band, this application proposes an antenna architecture that improves the spatial correlation between the multi-antenna units 100a based on improving the performance of the MIMO system, thereby improving the rank of the MIMO channel matrix and optimizing the throughput of the communication system. The designed balanced-mode suspended low-frequency antenna architecture has very low ECC between each other, especially the top and left, top and right antennas have an ECC better than 0.1, which is particularly beneficial to the application of the MIMO communication system and will increase the data transmission throughput of the system as much as possible.

[0197] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An electronic device, characterized in that: include: A conductive middle frame, comprising a plurality of middle frame edges connected end to end in sequence; and A plurality of antenna units, wherein the plurality of antenna units are respectively arranged on different edges of the middle frame on the conductive middle frame, the antenna unit comprises a radiator, the radiator is arranged close to and along the edge of the middle frame, two adjacent antenna units excite current distributions with intersecting directions on the conductive middle frame, the two relatively arranged antenna units have opposite main radiation directions in the far field, and the electric field polarization directions of the two adjacent antenna units in the far field are orthogonal.

2. The electronic device according to claim 1, wherein: The multiple antenna units include a first antenna unit and a second antenna unit. The first antenna unit and the second antenna unit are respectively arranged on two adjacent sides of the middle frame. The first antenna unit excites a first current on the conductive middle frame when resonating, and the second antenna unit excites a second current on the conductive middle frame when resonating. The direction of the first current is perpendicular to the direction of the second current.

3. The electronic device according to claim 2, characterized in that: The multiple antenna units include a third antenna unit, which is arranged relative to the first antenna unit. When resonating, the third antenna unit excites a third current on the conductive middle frame, and the direction of the third current is opposite to the direction of the first current and perpendicular to the direction of the second current.

4. The electronic device according to claim 3, characterized in that: The multiple antenna units include a fourth antenna unit, and the fourth antenna unit and the second antenna unit are arranged relative to each other. When resonating, the fourth antenna unit excites a fourth current on the conductive middle frame, and the direction of the fourth current is opposite to the direction of the second current, the direction of the fourth current is perpendicular to the direction of the first current, and the direction of the fourth current is perpendicular to the direction of the third current.

5. The electronic device according to any one of claims 1 to 4, characterized in that: The antenna unit also includes a matching circuit and a feed source; the radiator is a dipole radiator, and the feed point of the radiator is electrically connected to the feed source through the matching circuit.

6. The electronic device according to claim 5, characterized in that: The radiator further includes a first free end and a second free end disposed on opposite sides of the feed point, and the first free end and the second free end are both spaced apart from the edge of the middle frame.

7. The electronic device according to claim 6, characterized in that: When the antenna unit resonates, the current excited on the radiator flows from the first free end to the second free end, or from the second free end to the first free end.

8. The electronic device according to claim 7, characterized in that: The direction of the current excited by the antenna unit on the conductive middle frame is opposite to the direction of the current excited by the antenna unit on the radiator.

9. The electronic device according to claim 6, characterized in that: When the antenna unit resonates, the current excited on the radiator operates in a 1 / 2 wavelength mode between the first free end and the second free end.

10. The electronic device according to claim 6, characterized in that: The matching circuit includes a capacitor device, and the capacitance value of the capacitor device is smaller than a preset capacitance value.

11. The electronic device according to claim 6, characterized in that: The radiator also includes a tuning point, which is located between the feed point and the first free end or between the feed point and the second free end. The antenna unit also includes a switching circuit, which is electrically connected to the tuning point and is used to switch the frequency band supported by the antenna unit.

12. The electronic device according to any one of claims 1 to 4, characterized in that: The plurality of antenna units include a first antenna unit, a second antenna unit, a third antenna unit and a fourth antenna unit which are arranged adjacent to each other in sequence, the first antenna unit is arranged opposite to the third antenna unit, and the second antenna unit is arranged opposite to the fourth antenna unit; The electronic device further includes at least one radio frequency module, wherein the radio frequency module is electrically connected to at least one of the plurality of antenna units and is configured to provide an excitation signal for the antenna unit.

13. The electronic device according to claim 12, characterized in that: Two adjacent antenna units among the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit form a first antenna unit group, and the other two adjacent antenna units form a second antenna unit group; the at least one RF module includes a first RF module and a second RF module, the first RF module is electrically connected to the first antenna unit group, and the second RF module is electrically connected to the second antenna unit group.

14. The electronic device according to claim 12, characterized in that: The first antenna unit and the third antenna unit form a third antenna unit group, and the second antenna unit and the fourth antenna unit form a fourth antenna unit group; the at least one RF module includes a first RF module and a second RF module, the first RF module is electrically connected to the third antenna unit group, and the second RF module is electrically connected to the fourth antenna unit group.

15. The electronic device according to claim 13 or 14, characterized in that: The electronic device also includes a controller, which is electrically connected to the first RF module and the second RF module. The controller is used to control the first RF module and the second RF module to simultaneously excite the multiple antenna units to form a 4×4 MIMO antenna system, or control one of the first RF module and the second RF module to work to form a 2×2 MIMO antenna system.

16. The electronic device according to claim 12, characterized in that: The electronic device also includes a switching switch and a controller, the switching switch is electrically connected between the multiple antenna units and at least one of the radio frequency modules, and the controller is used to control the switching switch to electrically connect the radio frequency module to different groups of antenna units, each group of the antenna units includes two adjacent or oppositely arranged antenna units.

17. A method for controlling an electronic device, characterized in that: Applied to the electronic device according to any one of claims 1 to 16, the method comprising: receiving a trigger signal based on a signal transmission rate or a signal strength; According to the trigger signal, the RF module is controlled to excite multiple antenna units to work in a first mode or a second mode, wherein the first mode is that the multiple antenna units form a 4×4 MIMO antenna system, and the second mode is that the multiple antenna units form a 2×2 MIMO antenna system.

18. The method according to claim 17, characterized in that The controlling the radio frequency module to excite the plurality of antenna units to operate in the first mode according to the trigger signal includes: According to the trigger signal, the first RF module is controlled to excite the first antenna unit group to work and the second RF module is controlled to excite the second antenna unit group to work, wherein the first antenna unit group includes two adjacently arranged antenna units and the second antenna unit group includes another two adjacently arranged antenna units; or According to the trigger signal, the first RF module is controlled to excite the third antenna unit group to work and the second RF module is controlled to excite the fourth antenna unit group to work, wherein the third antenna unit group includes two antenna units arranged relatively to each other, and the fourth antenna unit group includes another two antenna units arranged relatively to each other.

19. The method according to claim 17, characterized in that The controlling the radio frequency module to excite the plurality of antenna units to operate in the second mode according to the trigger signal includes: The radio frequency module is controlled according to the trigger signal to excite two adjacent or oppositely arranged antenna units to work.

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