Antenna assembly and electronic equipment

Abstract

The invention provides an antenna assembly and electronic equipment, a first antenna unit comprises a first radiator and a first feed source, the first feed source is electrically connected with the first radiator, and the first feed source is used for exciting the first radiator to form a first resonant mode supporting a first frequency band; the current of the first resonant mode is distributed on the first radiator to form at least one current zero point; a second antenna unit is arranged adjacent to a first antenna unit, the second antenna unit comprises a second radiator and a second feed source, the second feed source is electrically connected with the second radiator, and the second feed source is used for exciting the second radiator to form a second resonant mode supporting a second frequency band. The difference between the center frequency point of the second frequency band and the center frequency point of the first frequency band is smaller than the first preset frequency band range. The first feed source excites the first radiator to form a reverse current, thereby weakening the coupling influence on the adjacent second antenna unit when the first antenna unit is used as a radiation source, and improving the isolation between the first antenna unit and the second antenna unit.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to an antenna assembly and electronic device. Background Technology

[0002] With the development of the communications industry, electronic devices need to support an increasing number of frequency bands. However, the space reserved for antennas on portable electronic devices is limited. Especially when multiple antennas are working in the same or similar frequency bands, how to improve the isolation between multiple antennas has become a technical problem that needs to be solved. Summary of the Invention

[0003] This application provides an antenna assembly that improves the isolation between antennas and an electronic device having the antenna assembly.

[0004] In a first aspect, this application provides an antenna assembly comprising:

[0005] The first antenna element includes a first radiator and a first feed source. The first feed source is electrically connected to the first radiator. The first feed source is used to excite the formation of a first resonant mode supporting a first frequency band on the first radiator. The current distribution of the first resonant mode forms at least one current zero point on the first radiator.

[0006] The second antenna unit is disposed adjacent to the first antenna unit. The second antenna unit includes a second radiator and a second feed source. The second feed source is electrically connected to the second radiator. The second feed source is used to excite the formation of a second resonant mode supporting a second frequency band on the second radiator. The difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than the range of a first preset frequency band.

[0007] In a second aspect, this application provides an electronic device including a frame and an antenna assembly as described in the first aspect. The frame includes a top frame, a first side frame, a bottom frame, and a second side frame connected in sequence, and the antenna assembly is disposed on any one of the top frame, the first side frame, the bottom frame, and the second side frame.

[0008] This application provides an antenna assembly and electronic device. The first antenna element is designed to include a first radiator and a first feed source. The first feed source is electrically connected to the first radiator and is used to excite the first radiator to form a first resonant mode supporting a first frequency band. The current distribution of the first resonant mode forms at least one current zero point on the first radiator. A second antenna element is designed to be adjacent to the first antenna element. The second antenna element includes a second radiator and a second feed source. The second feed source is electrically connected to the second radiator and is used to excite the second radiator to form a second resonant mode supporting a second frequency band. The difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than a first preset frequency band range. The first feed source excites a reverse current on the first radiator, reducing the coupling effect of the first antenna element as a radiation source on the adjacent second antenna element and improving the isolation between the first and second antenna elements. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0010] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0011] Figure 2 This is an exploded view of the structure of an electronic device provided in an embodiment of this application;

[0012] Figure 3 This is a schematic diagram of the structure of an antenna assembly provided in an embodiment of this application;

[0013] Figure 4 This is a return loss S22 curve of the first antenna element provided in the embodiments of this application;

[0014] Figure 5 This is a return loss S11 curve of the second antenna unit provided in the embodiments of this application;

[0015] Figure 6 This is a schematic diagram of the current distribution of the first resonant mode of the first antenna element provided in the embodiments of this application. Figure 1 ;

[0016] Figure 7 This is a schematic diagram of the current distribution of the first antenna element in the first resonant mode according to an embodiment of this application;

[0017] Figure 8 This is a schematic diagram of the current distribution of the first antenna element in the third resonant mode provided in the embodiments of this application;

[0018] Figure 9This is a schematic diagram of the current distribution of the third resonant mode of the first antenna element provided in the embodiments of this application;

[0019] Figure 10 This is a schematic diagram of the structure of the first matching circuit provided in an embodiment of this application;

[0020] Figure 11 This is a schematic diagram of the structure of the first antenna unit provided in the embodiments of this application, including the second matching circuit and the third matching circuit;

[0021] Figure 12 This is a schematic diagram of the structure of the first antenna unit including the first matching circuit provided in the embodiments of this application;

[0022] Figure 13 This is a schematic diagram of the structure of the first antenna assembly provided in the embodiments of this application;

[0023] Figure 14 This is a schematic diagram of the current distribution of the second antenna unit in the second resonant mode provided in the embodiments of this application;

[0024] Figure 15 This is a schematic diagram of the current distribution of the second antenna unit in the fifth resonant mode provided in an embodiment of this application;

[0025] Figure 16 This is a schematic diagram of the structure and current distribution when the second antenna unit and the first antenna unit are placed adjacent to each other on the same side of the mobile phone, as provided in this application.

[0026] Figure 17 This is a current simulation diagram of the first antenna element provided in the embodiment of this application in the third resonant mode;

[0027] Figure 18 This is a current simulation diagram of the first antenna unit provided in the embodiments of this application under the first resonant mode;

[0028] Figure 19 This is a current simulation diagram of the second antenna unit in the fifth resonant mode provided in the embodiments of this application;

[0029] Figure 20 This is a current simulation diagram of the second antenna unit in the second resonant mode provided in the embodiments of this application;

[0030] Figure 21 This is a simulation diagram of the structure and current when the second antenna unit and the first antenna unit are placed adjacent to each other on the same side of the mobile phone, as provided in this application.

[0031] Figure 22 This is a current simulation diagram of the first antenna unit forming a first resonant mode and the second antenna unit forming a second resonant mode provided in the embodiments of this application;

[0032] Figure 23 This is a comparison chart of the isolation (N78 band) between the dual-antenna scheme provided in this application and several conventional dual-antenna schemes (including dual IFA, dual CLRH, and dual loop schemes);

[0033] Figure 24a This is a schematic diagram of the antenna assembly provided in this application located on the top bezel;

[0034] Figure 24b This is a schematic diagram of the antenna assembly provided in this application disposed on the first side frame;

[0035] Figure 24c This is a schematic diagram of the antenna assembly provided in this application located on the bottom frame;

[0036] Figure 25 This is an efficiency diagram of the first antenna unit and the second antenna unit provided in this application in a relatively complex overall system environment;

[0037] Figure 26 The efficiency simulation results of the three-frequency mode of the first antenna unit provided in this application, which is electrically connected to the second matching circuit and the third matching circuit at both ends respectively;

[0038] Figure 27a This is a schematic diagram of the structure of the first antenna element provided in this application located on the top frame;

[0039] Figure 27b This is a schematic diagram of the structure of the first antenna element provided in this application disposed on the first side frame;

[0040] Figure 27c This is a schematic diagram of the structure of the first antenna element provided in this application located on the bottom frame;

[0041] Figure 27d This is a schematic diagram of the structure of multiple first antenna elements provided in this application disposed on the bottom frame.

[0042] Explanation of icon numbers:

[0043] Electronic device 1000; Antenna assembly 100; Display screen 200; Mid-frame 300; Back cover 400; Mid-plate 310; Frame 320; Top frame 321; Bottom frame 324; First side frame 322; Second side frame 323; Reference ground system 500; First antenna element 110; Second antenna element 120; First radiator 11; First feed 12; First feed point A1; Second radiator 21; Second feed 22; First ground point D1; First current zero point H1; First current Q1 Second current Q2; Second grounding point D2; Second current zero point H2; Third current Q3; Fourth current Q4; Third current zero point H3; Fifth current Q5; Sixth current Q6; Sixth current zero point H6; First matching circuit M1; First matching switch M11; First matching branch M12; Second matching branch M13; Second matching circuit M2; Third matching circuit M3; Fourth current zero point H4; Third grounding point D3; Second feed point A2; First free end E1; Fifth current zero point H5. Detailed Implementation

[0044] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0046] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0047] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of this application. The electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablets, laptops, computers, wearable devices, drones, robots, and digital cameras. This embodiment uses a mobile phone as an example for illustration; other electronic devices can refer to this embodiment. The electronic device includes, but is not limited to, candybar phones, folding phones with a hinge along the length direction (including but not limited to two-fold, three-fold, and four-fold phones), folding phones with a hinge along the width direction, or other phones with retractable / expandable display screen areas.

[0048] Please see Figure 2 , Figure 2 This is a partially exploded view of the electronic device 1000 provided in this application embodiment. Taking a mobile phone as an example, the operating environment of the antenna assembly 100 is illustrated. Please refer to... Figure 2 The electronic device 1000 includes a display screen 200, a mid-frame 300, and a back cover 400 arranged sequentially along the thickness direction. The mid-frame 300 includes a mid-plate 310 and a frame 320 surrounding the mid-plate 310. The frame 320 is a conductive frame, such as a metal frame. Receiving spaces are formed between the display screen 200 and the mid-plate 310, and between the mid-plate 310 and the back cover 400, to accommodate components such as a motherboard 600, a camera module, a receiver module, a battery 700, a sub-board 800, and various sensors. One side of the frame 320 along the thickness direction surrounds the edge of the display screen 200, and the other side of the frame 320 along the thickness direction surrounds the edge of the back cover 400, forming the complete external structure of the electronic device 1000. In this embodiment, the frame 320 and the mid-plate 310 are an integral structure, while the frame 320 and the back cover 400 are separate structures. The above describes the working environment of the antenna assembly 100 using a mobile phone as an example; however, the antenna assembly 100 of this application is not limited to the above working environment.

[0049] Please see Figure 24a The frame 320 includes a top frame 321 and a bottom frame 324 disposed opposite to each other, and a first side frame 322 and a second side frame 323 connected to the top frame 321 and the bottom frame 324. The top frame 321 is the side away from the ground when the user holds and uses the electronic device 1000 in portrait mode, and the bottom frame 324 is the side facing the ground when the user holds and uses the electronic device 1000 in portrait mode. The first side frame 322 is the left side when the user holds and uses the electronic device 1000 in portrait mode. The second side frame 323 is the right side when the user holds and uses the electronic device 1000 in portrait mode. Alternatively, the first side frame 322 can also be the right side when the user holds and uses the electronic device 1000, and the second side frame 323 can be the left side when the user holds and uses the electronic device 1000.

[0050] Optionally, the top border 321 is a straight border, and both the first side border 322 and the second side border 323 have straight borders in the middle and curved borders at both ends. The curvature angles of the curved borders at both ends of the first side border 322 are close to or equal to 90°. The curvature angles of the curved borders at both ends of the second side border 323 are also close to or equal to 90°. The curved borders are rounded. The bottom border 324 is a straight border.

[0051] The antenna assembly 100 is disposed on any one of the top frame 321, the first side frame 322, the bottom frame 324, and the second side frame 323.

[0052] Please see Figure 2 The electronic device 1000 also includes a reference ground system 500. The reference ground system 500 is located within a frame 320. The frame 320 surrounds the periphery of the reference ground system 500. The reference ground system 500 is generally rectangular in shape. Various slots and holes are formed on the reference ground edge of the reference ground system 500 to accommodate components or avoid other structures as needed in the mobile phone. The reference ground system 500 includes, but is not limited to, the metal alloy portion of the middle plate 310 and the reference ground metal portion of the circuit boards (including the main board 600 and the sub-board 800). In general, the reference ground system in the electronic device 1000 can be equivalent to a roughly rectangular shape, hence the name reference ground system 500. However, the reference ground system 500 does not imply that the reference ground is plate-shaped or a rectangular plate.

[0053] The specific structure of the antenna assembly 100 provided in Embodiment 1 will be illustrated below with reference to the accompanying drawings.

[0054] Please see Figure 3 The antenna assembly 100 includes a first antenna element 110 and a second antenna element 120.

[0055] Please see Figure 3 The first antenna element 110 includes a first radiator 11 and a first feed 12.

[0056] This application does not specifically limit the material of the first radiator 11. Optionally, the first radiator 11 may be made of a conductive material, including but not limited to conductive materials such as metals, alloys, and graphene. This application does not specifically limit the shape of the first radiator 11. For example, the shape of the first radiator 11 may include, but is not limited to, strips, sheets, rods, coatings, and films. Figure 3The first radiator 11 shown is merely an example and does not limit the shape of the first radiator 11 provided in this application. In this embodiment, the first radiator 11 is always strip-shaped. This application does not limit the extension trajectory of the first radiator 11. Optionally, the first radiator 11 may extend along a straight line, a curve, or a bend. The first radiator 11 described above may be a line of uniform width on its extension trajectory, or it may be a strip of varying width, such as one with a gradually changing width or a widened region.

[0057] This application does not specifically limit the form of the first radiator 11. Optionally, the form of the first radiator 11 includes, but is not limited to, a metal frame 320, a metal frame embedded in a plastic frame 320, a metal radiator located within or on the surface of the frame 320, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser-directly formed antenna (LDS), a printed-directly formed antenna (PDS), a conductive sheet antenna (e.g., a metal bracket antenna), etc. In this embodiment, the first radiator 11 is taken as part of the metal frame 320 of the electronic device 1000.

[0058] The first feed source 12 includes, but is not limited to, radio frequency transceiver chips, etc. The first feed source 12 is located on the motherboard.

[0059] The first feed source 12 is electrically connected to the first radiator 11, and further, the first feed source 12 is electrically connected to the first feed point A1.

[0060] Optional, please refer to Figure 3 The first radiator 11 includes a first feed point A1, wherein the first feed point A1 is the position where the first feed source 12 is electrically connected to the first radiator 11. It can be a local position in the middle of the first radiator 11 or a protrusion on the edge of the first radiator 11.

[0061] The electrical connections described in this application include direct electrical connections between two structures or indirect electrical connections through other components. In this embodiment, the first feed source 12 and the first feed point A1 are indirectly electrically connected through other electronic components (RF front-end circuit, matching circuit, etc.).

[0062] The first feed source 12 is configured to provide radio frequency excitation current for the required frequency band. The radio frequency signal output port of the first feed source 12 is a power supply port, which is not limited to, being electrically connected to the first power supply point A1 on the frame 320 (e.g., a protrusion on the inner side of the frame 320) indirectly by means of soldering, coaxial cable, microstrip line, conductive spring, or conductive screw. In this embodiment, the first feed source 12 is electrically connected to the first power supply point A1 through a power supply spring (conductive spring) provided on the motherboard.

[0063] Optionally, the first feed source 12 is configured to provide a radio frequency excitation signal for a first frequency band.

[0064] Please see Figure 4 The first feed source 12 is used to excite the first radiator 11 to form a first resonant mode supporting the first frequency band. The current distribution of the first resonant mode forms at least one current zero on the first radiator 11. This application does not specifically limit the number of current zeros formed on the first radiator 11. Optionally, the number of current zeros can be one, two, three, etc.

[0065] Among them, the current zero point refers to the position where the current value on the current wave is less than the current on both sides; it can also refer to the point where the current value on the current wave is zero or close to zero; or it can refer to the position that is very close to zero relative to a certain reference value.

[0066] From the current simulation diagram, it can be seen that the first radiator 11 has two parts of current with opposite directions. The current zero point position (or current zero point region) refers to the region between the two parts of opposite current.

[0067] When a current zero is formed on the first radiator 11, it means that the first feed 12 excites at least two parts of the radiator with opposite currents. It can be considered that when the first antenna element 110 acts as a field source, the radiation field will have a superposition and cancellation effect due to the reverse current it has, which can reduce the coupling to the adjacent antennas and thus improve the isolation between the antennas.

[0068] In other words, this application designs the first resonant mode on the first radiator 11 of the first antenna element 110, and then designs the current distribution on the first radiator 11 to form at least one current zero on the first radiator 11. When the first antenna element 110 acts as a field source, the radiation field will have a superposition and cancellation effect due to the reverse current it has, which can reduce the coupling to the adjacent antennas and thus improve the isolation between antennas.

[0069] It should be noted that the first antenna element 110 forms a radiation field in space as a field source. The superposition and cancellation brought about by the opposite current refers to the superposition and cancellation of energy in a certain direction of the radiation field, so as to reduce the coupling between adjacent antenna elements of the same or near frequency. The radiation field of the first antenna element 110 also has other directions as the main radiation direction. Therefore, the first antenna element 110 will have a higher gain in the main radiation direction in the first frequency band, and thus have better working efficiency in the first frequency band.

[0070] Optionally, the first radiator 11 is configured to support a first frequency band. This application is not limited to the radio frequency excitation signal of the first frequency band forming a current pattern of n*1 / 4 wavelengths, such as 1 / 2 wavelength, 3 / 4 wavelength, or 1 times the wavelength, on the first radiator 11. Further, the radio frequency excitation signal of the first frequency band forms a current pattern of n*1 wavelengths, such as 1 times the wavelength or 2 times the wavelength, on the first radiator 11.

[0071] Taking the first resonant mode as a wavelength-limited mode as an example, specifically, the equivalent electrical length of the first radiator 11 is close to or equal to one wavelength of the center frequency of the first frequency band, so as to excite the first radiator 11 to form a current mode supporting one wavelength of the first frequency band. The "close to" mentioned herein refers to a fluctuation of 1 / 10 wavelength. When the first radiator 11 is not electrically connected to the circuit used for impedance tuning, the equivalent electrical length of the first radiator 11 is close to or equal to the electrical length of its own branches. When the first radiator 11 is electrically connected to the circuit used for impedance tuning, the equivalent electrical length of the first radiator 11 is close to or equal to the sum of the electrical length of its own branches and the equivalent electrical length of the circuit used for impedance tuning.

[0072] The relationship between electrical length and physical length described in this application can satisfy the following formula:

[0073]

[0074] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in the free scene.

[0075] In other words, the first feed source 12 is configured to excite the first radiator 11 to support the first frequency band. After the radio frequency excitation signal of the first frequency band is transmitted to the first radiator 11, it can excite the first radiator 11 to generate a resonant current, forming a resonant mode (i.e., the aforementioned first resonant mode) to support the frequency band corresponding to the resonant current.

[0076] Optional, please refer to Figure 3The antenna assembly 100 includes a first matching circuit M1. The first matching circuit M1 is electrically connected between the first feed source 12 and the first feed point A1. The first matching circuit M1 includes at least one of a capacitor and an inductor. The first matching circuit M1 adjusts the impedance matching between the port of the first feed source 12 (the aforementioned feed port) and the port of the first radiator 11, thereby facilitating the first feed source 12 to excite a first resonant mode on the first radiator 11.

[0077] This application does not specify the size of the first frequency band. Optionally, the first frequency band may include, but is not limited to, at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, GPS band, etc. The above-mentioned cellular mobile frequency bands include, but are not limited to, 4G bands, 5G bands, or 6G bands, etc.

[0078] Furthermore, the first frequency band includes, but is not limited to, B20, B28, B1, B3, B7, B38, B40, B41, etc. in the 4G frequency band allocation of the mobile communication standard, N1, N3, N41, N77, N78, N79, etc. in the 5G frequency band allocation of the mobile communication standard, and at least one of GPS-L1, GPS-L5, Wi-Fi 2.4G, Wi-Fi 5G, etc.

[0079] This application does not specifically limit the antenna type of the first antenna element 110. Optionally, the antenna type of the first antenna element 110 may include, but is not limited to, an IFA antenna, a LOOP antenna, etc.

[0080] Please see Figure 3 The second antenna unit 120 is disposed adjacent to the first antenna unit 110. Optionally, the second antenna unit 120 may be disposed on the same side of the frame as the first antenna unit 110. For example, the second antenna unit 120 may be disposed on the side of the frame where the first antenna unit 110 is located; or, the second antenna unit 120 may be disposed on the side of the first side frame where the first antenna unit 110 is located; or, the second antenna unit 120 may be disposed on the side of the second side frame where the first antenna unit 110 is located; or, the second antenna unit 120 may be disposed on the side of the bottom frame where the first antenna unit 110 is located.

[0081] Optional, please refer to Figure 3 The second antenna unit 120 includes a second radiator 21 and a second feed source 22.

[0082] The material, shape, and form of the second radiator 21 can be referenced from the material, shape, and form of the first radiator 11.

[0083] The second feed source 22 is electrically connected to the second radiator 21.

[0084] Please see Figure 3 and Figure 5 The second feed source 22 is used to excite the second radiator 21 to form a second resonant mode that supports the second frequency band.

[0085] The specific form and function of the second feed source 22 can be referenced from the specific form and function of the first feed source 12. The connection method of the second feed source 22 to the second radiator 21 can be referenced from the connection method of the first feed source 12 to the first radiator 11.

[0086] The relationship between the equivalent electrical length of the second radiator 21 and the second frequency band can be found by referring to the relationship between the equivalent electrical length of the second radiator 21 and the second frequency band.

[0087] The second frequency band includes, but is not limited to, B20, B28, B1, B3, B7, B38, B40, B41, etc. in the 4G frequency band allocation of mobile communication standards, N1, N3, N41, N77, N78, N79, etc. in the 5G frequency band allocation of mobile communication standards, and at least one of GPS-L1, GPS-L5, Wi-Fi 2.4G, Wi-Fi 5G, etc.

[0088] Please see Figure 5 The difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than a first preset frequency band range. This application does not specifically limit the first preset frequency band range. For example, the first preset frequency band range is 1 GHz. As another example, the difference between the center frequency of the second frequency band and the center frequency of the first frequency band is, but is not limited to, 0 to 1 GHz. The second frequency band and the first frequency band can be the same frequency band or frequency bands with a small frequency difference.

[0089] This application does not specifically limit the antenna type of the second antenna element 120. Optionally, the antenna type of the second antenna element 120 may include, but is not limited to, an IFA antenna, a LOOP antenna, etc.

[0090] Optional, please refer to Figure 3 The antenna assembly 100 includes a fourth matching circuit M4. The fourth matching circuit M4 is electrically connected between the second feed source 22 and the second feed point A2. The fourth matching circuit M4 includes at least one of a capacitor and an inductor. The fourth matching circuit M4 adjusts the impedance matching between the port of the second feed source 22 (the aforementioned feed port) and the port of the second radiator 21, thereby facilitating the second feed source 22 to excite a first resonant mode on the second radiator 21.

[0091] This application is not limited to the second resonant mode and does not make any specific limitation. Optionally, the second resonant mode includes, but is not limited to, a current mode of n*1 / 4 wavelength, such as 1 / 4 wavelength, 1 / 2 wavelength, 3 / 4 wavelength, 1 wavelength, or 2 wavelength.

[0092] Furthermore, in the adjacent first antenna unit 110 and second antenna unit 120, the transmission and reception of the first antenna unit 110 for the first frequency band may interfere with the transmission and reception of the second antenna unit 120 for the second frequency band.

[0093] The second frequency band and the first frequency band can be frequency bands with overlapping frequency points or adjacent frequency bands. Alternatively, the first frequency band and the second frequency band can be the same frequency band. For example, if the entire device requires four B41 / N41 or four N78 antennas for communication, both the first and second frequency bands can be B41, both N41, or both N78. Alternatively, the first and second frequency bands can be Wi-Fi 2.4G and the N41 frequency band, respectively.

[0094] When the overall communication requires multiple (e.g., 4) B41 / N41 or multiple (e.g., 4) N78 channels, two adjacent antenna elements of the electronic device may support similar or the same frequency bands. The poor isolation between two adjacent antenna elements of the same or near-frequency bands affects the actual antenna performance. Increasing the spacing between two antenna elements of the same or near-frequency bands increases the space requirement, which adversely affects the overall antenna layout and space utilization, making the solution difficult to implement.

[0095] Based on the above-mentioned problems, this application provides an antenna assembly 100 and an electronic device 1000. By designing the first antenna unit 110 to include a first radiator 11 and a first feed 12, the first feed 12 is electrically connected to the first radiator 11 and is used to excite the first radiator 11 to form a first resonant mode supporting a first frequency band. The current distribution of the first resonant mode forms at least one current zero point on the first radiator 11. By designing the second antenna unit 120 to be arranged adjacent to the first antenna unit 110, the second antenna unit 120 includes a second radiator 21 and a second feed 22. The second feed 22 is electrically connected to the second radiator 21 and is used to excite the second radiator 21 to form a second resonant mode supporting a second frequency band. The difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than a first preset frequency band range. The first feed 12 excites the first radiator 11 to form a reverse current, which reduces the coupling effect of the first antenna element 110 as a radiation source on the adjacent second antenna element 120, improves the isolation between the first antenna element 110 and the second antenna element 120, and thus improves the antenna performance of two adjacent antenna elements supporting the same or near frequency. This makes it easier to realize the antenna layout requirements of multiple (e.g., 4) B41 / N41 and / or multiple (e.g., 4) N78 on electronic devices 1000 (e.g., mobile phones).

[0096] The specific structures of the first radiator 11 and the second radiator 21 are illustrated below with reference to the accompanying drawings.

[0097] Optional, please refer to Figure 6 The first radiator 11 includes the aforementioned first feed point A1 and first ground point D1.

[0098] The first grounding point D1 is the location where the first radiator 11 is electrically connected to the reference ground system 500.

[0099] The first feed point A1 is electrically connected to the first feed source 12. The first ground point D1 is used to electrically connect to the reference ground system 500.

[0100] The grounding point described in this application is electrically connected to the reference ground system 500. The electrical connection method includes, but is not limited to, the grounding point returning to ground through a grounding spring; or, the grounding point and the reference ground system 500 are interconnected as one unit, that is, through a physical return to ground method.

[0101] In one alternative implementation, please refer to Figure 6 The first feed point A1 can be located between the two ends of the first radiator 11 along its length.

[0102] For another alternative implementation, please refer to Figure 7The first feed point A1 can be located at the end or near the end of the first radiator 11 along its length, and the first radiator 11 and the first feed source 12 form a LOOP antenna.

[0103] The first radiator 11 can form a current distribution in an n*1 / 2 wavelength mode. Among them, one or more 1 / 2 wavelength mode current distributions are formed between the first feed point A1 and the first ground point D1.

[0104] In one alternative implementation, a 1-wavelength current mode is formed between the first feed point A1 and the first ground point D1. A current zero point is formed between the first feed point A1 and the first ground point D1.

[0105] Please see Figure 6 The current distribution of the first resonant mode forms a current zero point on the first radiator 11, defined as the first current zero point H1. The first current zero point H1 is located between the first feed point A1 and the first ground point D1. The current distribution of the first resonant mode includes a first current Q1 and a second current Q2 located between the first feed point A1 and the first ground point D1, with the direction of the first current Q1 opposite to the direction of the second current Q2. The first current zero point H1 is formed between the first current Q1 and the second current Q2. It should be noted that the first current zero point H1 can be a point or a region. A current zero point refers to the position where the currents on both sides are reversed, and is also a position where the current intensity is extremely weak or relatively zero.

[0106] Optionally, in one phase, the direction of the first current Q1 is from the first feed point A1 to the first current zero point H1, and the direction of the second current Q2 is from the first ground point D1 to the first current zero point H1. In another phase, the direction of the first current Q1 is from the first current zero point H1 to the first feed point A1, and the direction of the second current Q2 is from the first current zero point H1 to the first ground point D1.

[0107] The current intensity at the first feed point A1 is greater than the current intensity at the first current zero point H1, and the current intensity at the first grounding point D1 is greater than the current intensity at the first current zero point H1. In other words, the first feed point A1 and the first grounding point D1 are points with stronger currents compared to the first current zero point H1.

[0108] This application does not limit the position of the first current zero point H1 between the first grounding point D1 and the first feed point A1. For example, the first current zero point H1 may be located at the midpoint between the first grounding point D1 and the first feed point A1 (hereinafter defined as the first midpoint position), or the first current zero point H1 may be located between the first midpoint position and the first grounding point D1, or the first current zero point H1 may be located between the first midpoint position and the first feed point A1.

[0109] In this embodiment, a first current zero point H1 is excited between the first grounding point D1 and the first feed point A1 of the first radiator 11, thereby forming a reverse current on both sides of the first current zero point H1. This reverse current causes the radiation field of the first antenna element 110 when it acts as a field source to have a superposition and cancellation effect, thereby reducing the coupling to the nearby co-frequency or near-frequency antenna (second antenna element 120) and improving the isolation between antennas (first antenna element 110 and second antenna element 120).

[0110] It should be noted that this application does not specifically limit the number of current zeros between the first grounding point D1 and the first feed point A1. This embodiment takes one current zero as an example. In other embodiments, the number of current zeros between the first grounding point D1 and the first feed point A1 can also be two, three, etc.

[0111] Optional, please refer to Figure 6 The first radiator 11 also includes a second grounding point D2. In other words, the first radiator 11 includes a first grounding point D1, a first feed point A1, and a second grounding point D2. The second grounding point D2 and the first grounding point D1 are located on opposite sides of the first feed point A1. The second grounding point D2 is used for electrical connection to the reference ground system 500. In other words, the first radiator 11 is a single-feed, dual-ground antenna.

[0112] In another alternative implementation, a 1-wavelength current mode is formed between the first feed point A1 and the second ground point D2. A current zero point is formed between the first feed point A1 and the second ground point D2. Thus, a 2-wavelength current mode is formed between the second ground point D2 and the first ground point D1.

[0113] In another implementation, please refer to Figure 6 The current distribution of the first resonant mode on the first radiator 11 also forms a second current zero point H2. The second current zero point H2 is located between the first feed point A1 and the second ground point D2.

[0114] In other words, the current distribution of the first resonant mode forms a first current zero point H1 between the first feed point A1 and the first ground point D1, and the current distribution of the first resonant mode forms a second current zero point H2 between the first feed point A1 and the second ground point D2.

[0115] For details, please refer to Figure 6The current distribution in the first resonant mode includes a first current Q1 and a second current Q2 located between the first feed point A1 and the first ground point D1, and a third current Q3 and a fourth current Q4 located between the first feed point A1 and the second ground point D2. The direction of the first current Q1 is opposite to the direction of the second current Q2. A first current zero point H1 is formed between the first current Q1 and the second current Q2. The direction of the third current Q3 is opposite to the direction of the fourth current Q4. A second current zero point H2 is formed between the third current Q3 and the fourth current Q4. It should be noted that the second current zero point H2 can be a point or a region.

[0116] Optionally, in one phase, the direction of the third current Q3 is from the first feed point A1 to the second current zero point H2, and the direction of the fourth current Q4 is from the second ground point D2 to the second current zero point H2. In another phase, the direction of the fourth current Q4 is from the second current zero point H2 to the first feed point A1, and the direction of the fourth current Q4 is from the second current zero point H2 to the second ground point D2.

[0117] The current intensity at the first feed point A1 is greater than the current intensity at the second current zero point H2, and the current intensity at the second grounding point D2 is greater than the current intensity at the second current zero point H2. In other words, the first feed point A1 and the second grounding point D2 are points with stronger currents compared to the second current zero point H2.

[0118] In this embodiment, the first radiator 11 can form a current distribution in a 2*1 wavelength mode. Specifically, a 1 wavelength mode current distribution is formed between the first feed point A1 and the first ground point D1. A 1 wavelength mode current distribution is also formed between the first feed point A1 and the second ground point D2.

[0119] It should be noted that this application does not specifically limit the number of current zeros between the second grounding point D2 and the first feed point A1. This embodiment takes one current zero as an example. In other embodiments, the number of current zeros between the second grounding point D2 and the first feed point A1 can also be two, three, etc.

[0120] In other embodiments, a current distribution in an n*1 wavelength mode is formed between the first feed point A1 and the first ground point D1. A current distribution in an m*1 wavelength mode is formed between the first feed point A1 and the second ground point D2. In this case, there are multiple current zeros between the first feed point A1 and the first ground point D1, and multiple current zeros between the first feed point A1 and the second ground point D2. Reverse currents are formed on both sides of the current zeros. These reverse currents cause the radiation field of the first antenna element 110, when acting as a field source, to have a superposition and cancellation effect, thereby reducing coupling to nearby co-frequency or near-frequency antennas (the second antenna element 120).

[0121] For example, a current distribution supporting a wavelength mode of the F1 frequency band is formed between the first feed point A1 and the first ground point D1. A current distribution supporting a wavelength mode of the F1 frequency band is also formed between the first feed point A1 and the second ground point D2. Further, with or without tuning by the tuning circuit, the first radiator 11 forms two wavelength modes of current distribution supporting the F2 frequency band between the first feed point A1 and the first ground point D1. Two wavelength modes of current distribution supporting the F2 frequency band are also formed between the first feed point A1 and the second ground point D2. The F2 frequency band is greater than the F1 frequency band. For example, the F2 frequency band is N78, and the F1 frequency band is N41. The F1 and F2 frequency bands can operate simultaneously or in a time-division manner. Of course, since there is overlap between the frequency bands N78 and N77, the F2 frequency band can also be the N77 frequency band.

[0122] In this embodiment, a first current zero point H1 is excited between the first ground point D1 and the first feed point A1 of the first radiator 11, and a second current zero point H2 is excited between the second ground point D2 and the first feed point A1. Reverse currents are formed on both sides of the current zero points. The reverse currents cause the radiation field of the first antenna element 110 when it acts as a field source to have a superposition and cancellation effect, thereby reducing the coupling to the nearby co-frequency or near-frequency antenna (the second antenna element 120) and improving the isolation between the antennas (the first antenna element 110 and the second antenna element 120).

[0123] Optional, please refer to Figure 8 The distance between the first power supply point A1 and the center position (O1) of the first grounding point D1 and the second grounding point D2 is less than or equal to the first preset distance.

[0124] In this embodiment, the first feed point A1 is close to or located at the center between the first grounding point D1 and the second grounding point D2. This application does not specifically limit the first preset distance. For example, the first preset distance is 1 / 4 of the total length of the radiator 11.

[0125] When the first feed point A1 is closer to the center position (O1) of the first ground point D1 and the second ground point D2, the current on both sides of the first feed point A1 is more symmetrical. As a result, when the first antenna element 110 acts as a field source, the reverse current radiation field will have a superposition and cancellation effect, which can reduce the coupling to the adjacent antenna and thus improve the isolation between antennas.

[0126] For example, the first feed point A1 is located at the center position (O1) between the first ground point D1 and the second ground point D2, so that the current on the first radiator 11 is symmetrically distributed about the center (the position of the first feed point A1). The currents on both sides of the first feed point A1 are opposite. When the first antenna element 110 acts as a field source, it has a reverse current radiation field (this radiation field is the coupled radiation field of the first antenna element 110 and the second antenna element 120), which will have a superposition and cancellation effect to reduce the coupling to the adjacent antennas, thereby improving the isolation between antennas.

[0127] Optional, please refer to Figure 6 The current distribution in the first resonant mode also includes the formation of a third current zero point H3 at the location of the first feed point A1. The first current Q1 and the second current Q2 are opposite currents, the first current Q1 and the third current Q3 are opposite currents, and the third current Q3 and the fourth current Q4 are opposite currents. This design ensures that the current distribution on the first radiator 11 is such that adjacent currents are all opposite currents. This causes the radiation fields of adjacent currents to superimpose and cancel each other out, further reducing the coupling between the radiation fields of the second antenna element 120 and further improving the isolation between the first antenna element 110 and the second antenna element 120.

[0128] Optionally, the first resonant mode includes a ring mode with twice the wavelength of the center frequency of the first frequency band. Optionally, the aforementioned first current Q1, second current Q2, third current Q3, and fourth current Q4 are formed on the first radiator 11. Further, the first current Q1 is or close to half the wavelength of the first frequency band, the second current Q2 is or close to half the wavelength of the first frequency band, the third current Q3 is or close to half the wavelength of the first frequency band, and the fourth current Q4 is or close to half the wavelength of the first frequency band.

[0129] Further, please refer to Figure 4 The first feed source 12 is also used to excite the formation of a third resonant mode supporting the third frequency band on the first radiator 11. The third resonant mode includes a wavelength mode at the center frequency of the third frequency band.

[0130] Please see Figure 9The current distribution in the third resonant mode includes the formation of a fifth current Q5 and a sixth current Q6 between the first grounding point D1 and the second grounding point D2. The fifth current Q5 and the sixth current Q6 have opposite directions, and a sixth current zero point H6 is formed between them. Further, the sixth current zero point H6 is located at or near the first feed point A1. Optionally, in one phase, the direction of the fifth current Q5 is from the first grounding point D1 to the first feed point A1, and the direction of the sixth current Q6 is from the second grounding point D2 to the first feed point A1. In another phase, the direction of the fifth current Q5 is from the first feed point A1 to the first grounding point D1, and the direction of the sixth current Q6 is from the first feed point A1 to the second grounding point D2.

[0131] The fifth current Q5 is or close to half the wavelength of the third frequency band, and the sixth current Q6 is or close to half the wavelength of the third frequency band. The first grounding point D1 and the second grounding point D2 form a mode that is or close to one wavelength of the third frequency band. Because a sixth current zero H6 is formed between the fifth current Q5 and the sixth current Q6, the first antenna element 110, when operating in the third frequency band, can also improve the isolation from adjacent antenna elements operating in or close to the third frequency band.

[0132] This application does not specify the size of the third frequency band. Optionally, the third frequency band may include, but is not limited to, at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, GPS band, etc.

[0133] Further, please refer to Figure 4 The center frequency of the third frequency band is less than or equal to the center frequency of the first frequency band. Thus, the first antenna unit 110 can support both the first and third frequency bands. For example, the third frequency band includes the GPS-L1 band, and the first frequency band includes the N78 band. The first antenna unit 110 can support both the GPS-L1 and N78 bands, enabling one antenna unit to support multiple frequency bands. This promotes miniaturization of the antenna assembly 100 while increasing the number of supported antenna frequency bands.

[0134] Optional, please refer to Figure 10 The first matching circuit M1 includes a first matching switch M11 and multiple matching branches. The multiple matching branches include a first matching branch M12 and a second matching branch M13. In other embodiments, the multiple matching branches may include three or more matching branches.

[0135] The third frequency band includes a first sub-band and a second sub-band. The first sub-band and the second sub-band are different frequency bands. The first sub-band is a GPS frequency band, specifically the GPS-L1 band or the GPS-L5 band. The second sub-band is an MB band (greater than 1 GHz and less than or equal to 1.7 GHz).

[0136] When the first matching switch M11 switches to the first matching branch M12 electrically connecting the first feed point A1, a first resonant mode supporting the first sub-frequency band is formed on the first radiator 11.

[0137] When the first matching switch M11 switches to the second matching branch M13 and electrically connects to the first feed point A1, a first resonant mode supporting the second sub-band is formed on the first radiator 11.

[0138] This application does not impose specific structural limitations on the first matching branch M12, which may include, but is not limited to, a capacitor or an inductor. The first matching branch M12 may be connected in series between the first feed point A1 and the first feed source 12, or it may be electrically connected between the first feed point A1 and the reference ground system 500.

[0139] This application does not impose specific structural limitations on the second matching branch M13, which may include, but is not limited to, a capacitor or an inductor. The second matching branch M13 may be connected in series between the first feed point A1 and the first feed source 12, or it may be electrically connected between the first feed point A1 and the reference ground system 500.

[0140] Understandably, the impedances of the first matching branch M12 and the second matching branch M13 are different, meaning their equivalent electrical lengths are different. When the first matching switch M11 switches from conducting the first matching branch M12 to conducting the second matching branch M13, the total electrical length of the first radiator 11 changes, thereby changing the frequency bands supported by the first radiator 11, and thus enabling the antenna assembly 100 to support more frequency bands.

[0141] When the first sub-band is the GPS-L1 band, the second sub-band is the MB band, and the first band is N78, the antenna assembly 100 can support the GPS L1 / MB+N78 band.

[0142] Optionally, the first matching switch M11, the first matching branch M12, and the second matching branch M13 in the first matching circuit M1 can be individually configured as tuning circuits in other locations, such as other locations near the first feed point A1. Of course, the first matching switch M11 can also be switched to more matching branches to switch more frequency bands.

[0143] Depending on the form of the matching branch in the first matching circuit M1 selected, the frequency band supported by this embodiment is also different. It can support both GPS-L1 and MB, realize the switching of the frequency band supported by the first antenna unit 110, and keep the N78 frequency band always active while switching between the first sub-frequency band and the second sub-frequency band.

[0144] Of course, in other embodiments, the first matching circuit M1 may also be a matching circuit without a switch. Since the GPS-L1 band and the MB band partially overlap, the first radiator 11 may be designed as an antenna that supports the GPS L1+N78 band or an antenna that supports the MB+N78 band.

[0145] Optional, please refer to Figure 11 The first antenna unit 110 further includes a second matching circuit M2. The second matching circuit M2 is electrically connected between the first ground point D1 and the reference ground.

[0146] In one optional implementation, the second matching circuit M2 may include a second matching switch and multiple matching branches. The matching branches include capacitors, inductors, etc.

[0147] In another optional implementation, the second matching circuit M2 may not include a second matching switch. The second matching circuit M2 includes capacitors, inductors, etc. Furthermore, the second matching circuit M2 is a low-impedance circuit for the first frequency band.

[0148] Optional, please refer to Figure 11 The first antenna unit 110 further includes a third matching circuit M3. The third matching circuit M3 is electrically connected between the second ground point D2 and the reference ground.

[0149] In one optional implementation, the third matching circuit M3 may include a third matching switch and multiple matching branches. The matching branches include capacitors, inductors, etc.

[0150] In another optional implementation, the third matching circuit M3 may not include a third matching switch. The third matching circuit M3 includes capacitors, inductors, etc. Furthermore, the third matching circuit M3 is a low-impedance circuit for the first frequency band.

[0151] It should be noted that the first antenna unit 110 may include either or both of the second matching circuit M2 and the third matching circuit M3.

[0152] The first radiator 11 also forms a fourth resonant mode supporting the fourth frequency band under the excitation of the first feed 12. The center frequency of the fourth frequency band is greater than or equal to the center frequency of the first frequency band. Thus, the first antenna element 110 can support at least three frequency bands simultaneously under the excitation of the first feed 12.

[0153] The fourth frequency band includes, but is not limited to, at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, and GPS band. The aforementioned cellular mobile frequency bands include, but are not limited to, 4G, 5G, or 6G bands. Optionally, the fourth frequency band may cover Wi-Fi 5G. The first antenna unit 110, under the excitation of the first feed 12, can support at least the GPS L1 / MH+N77 / 78+Wi-Fi 5G frequency bands.

[0154] In one alternative implementation, please refer to Figure 12 The first resonant mode can also be a loop mode supporting one wavelength of the first frequency band. As mentioned above, the first radiator 11 includes a first feed point A1, a first ground point D1, and a second ground point D2. The first feed point A1 is electrically connected to the first feed source 12. The second ground point D2 and the first ground point D1 are located on opposite sides of the first feed point A1.

[0155] The distance between the center positions of the first power supply point A1 and the first grounding point D1 and the second grounding point D2 is less than or equal to the second preset distance.

[0156] Please see Figure 12 The current distribution of the first resonant mode forms the fourth current zero point H4 at the first feed point A1.

[0157] In this embodiment, the first power supply point A1 is close to or located at the center between the first grounding point D1 and the second grounding point D2. This application does not specifically limit the second preset distance.

[0158] When the first feed point A1 is closer to the center of the first ground point D1 and the second ground point D2, the current on both sides of the first feed point A1 is more symmetrical. As a result, when the first antenna element 110 acts as a field source, the reverse current radiation field will have a superposition and cancellation effect, which can reduce the coupling to the adjacent antennas and thus improve the isolation between antennas.

[0159] For example, the first feed point A1 is located at the center between the first ground point D1 and the second ground point D2. The first ground point D1 and the second ground point D2 are symmetrical about the first feed point A1, so that the current on the first radiator 11 is symmetrically distributed about the center (the location of the first feed point A1). The currents on both sides of the first feed point A1 are opposite. When the first antenna element 110 acts as a field source, the reverse current radiation field (the coupling field between the first antenna element 110 and the adjacent antenna elements) will have a superposition and cancellation effect, so as to reduce the coupling to the adjacent antennas and thus improve the isolation between antennas.

[0160] The current between the first feed point A1 and the first ground point D1 is half the wavelength of the first frequency band, and the current between the first feed point A1 and the second ground point D2 is also half the wavelength of the first frequency band. A current of one wavelength of the first frequency band is formed between the first ground point D1 and the second ground point D2.

[0161] The above is an example of the structure of the first radiator 11. The structure of the second radiator 21 includes, but is not limited to, an IFA antenna, a LOOP antenna, and a single-fed dual-grounded antenna. The structure of the second radiator 21 will be illustrated below with reference to the accompanying drawings.

[0162] In one alternative implementation, please refer to Figure 13 The second radiator 21 includes a third ground point D3, a second feed point A2, and a first free end E1. The second feed point A2 is electrically connected to the second feed source 22. The third ground point D3 is electrically connected to the reference ground system 500, and the first free end E1 is an end formed by being disconnected from the reference ground system 500 and from other parts on the frame. The current distribution of the second resonant mode is between the third ground point D3 and the first free end E1. Optionally, the second antenna element 120 is an IFA antenna. The second resonant mode includes, but is not limited to, a 1 / 4 wavelength mode supporting the second frequency band. Alternatively, the second antenna element 120 is a composite left- or right-handed antenna, and the second resonant mode includes, but is not limited to, a composite left- or right-handed mode supporting the second frequency band.

[0163] Since at least one current zero is formed on the first radiator 11 when the first antenna element 110 is operating in the first frequency band, the radiation fields of the first antenna element 110 are superimposed and cancel each other in a certain direction, which reduces the influence of the first antenna element 110 on the second antenna element 120 operating in the second frequency band. The second frequency band and the first frequency band can be antennas of the same frequency band.

[0164] Optionally, the third grounding point D3 is located at the end closest to the first radiator 11. Alternatively, the first free end E1 is located at the end closest to the first radiator 11.

[0165] In one embodiment, the third grounding point D3 is directly electrically connected to the reference ground, or it can be grounded through a capacitor, inductor, or the like.

[0166] For another alternative implementation, please refer to Figure 3 The second radiator 21 includes a third grounding point D3 and a second feed point A2. The second feed point A2 is electrically connected to the second feed source 22. Optionally, the third grounding point D3 and the second feed point A2 are the two ends of the second radiator 21, respectively. The second antenna element 120 can be a loop antenna (the second radiator 21 and the reference ground system 500 form a loop structure).

[0167] Please see Figure 14 The current distribution in the second resonant mode includes the formation of a fifth current zero point H5 between the third grounding point D3 and the second feed point A2.

[0168] In other words, reverse currents are formed on both sides of the fifth current zero point H5. Since the currents on both sides of the fifth current zero point H5 are reversed, when the second antenna element 120 acts as a field source, the reverse current radiation field (the coupling field between the first antenna element 110 and the adjacent antenna element) will have a superposition and cancellation effect, thereby reducing the coupling to the nearby antennas and improving the isolation between the antennas.

[0169] Optionally, the fifth current zero point H5 can be located at the center of the second feed point A2 and the third ground point D3. In this way, the currents on both sides of the fifth current zero point H5 are opposite and symmetrical. The closer the fifth current zero point H5 is to the center of the third ground point D3 and the second feed point A2, the more symmetrical the currents on both sides of the fifth current zero point H5 become. Consequently, when the second antenna element 120 acts as a field source, its own reverse current radiation field will have a superposition and cancellation effect, which can further reduce the coupling to nearby antennas, thereby further improving the isolation between antennas.

[0170] The second resonant mode includes a 1-wavelength ring mode at the center frequency of the second frequency band.

[0171] Specifically, the current between the second feed point A2 and the fifth current zero point H5 is half the wavelength current of the second frequency band, and the current between the third ground point D3 and the fifth current zero point H5 is half the wavelength current of the second frequency band. The current between the second feed point A2 and the third ground point D3 is one wavelength current of the second frequency band.

[0172] Optionally, the first antenna element 110 is a single-fed, dual-grounded antenna. The first resonant mode on the first antenna element 110 is a double-wavelength mode supporting the first frequency band, and the directions of two adjacent currents are opposite. The second antenna element 120 is a loop antenna. The second resonant mode on the second antenna element 120 is a single-wavelength mode supporting the second frequency band, and the directions of the currents on the second radiator 21 are opposite. Further, the directions of the currents on the first radiator 11 and the adjacent currents on the second radiator 21 are opposite. The first and second frequency bands are co-frequency bands.

[0173] In this embodiment, the first antenna element 110 is constructed with a centrally symmetrical structure. The first feed point A1 is located at the center of the structure. The current distribution on the first radiator 11 is designed so that the current on the first antenna element 110 is centrally symmetrical. The currents on both sides of the first feed point A1 are opposite, and the directions of two adjacent currents on the first radiator 11 are opposite. This design allows the radiation field of the first antenna element 110 as a field source to have a superposition and cancellation effect, thereby reducing the coupling of the first antenna element 110 to the second antenna element 120 when it acts as a field source. The current distribution on the second radiator 21 is also designed so that the currents on adjacent currents on the second radiator 21 are... The two currents are in opposite directions, causing the radiation fields of the second antenna element 120 as a field source to have a superposition and destructive effect, thus reducing the coupling of the second antenna element 120 to the first antenna element 110 when it acts as a field source. Furthermore, the first antenna element 110 and the second antenna element 120 form a dual-antenna scheme on the same side. When the second antenna element 120 and the first antenna element 110 operate in the same frequency band (N78), they respectively construct loop modes of 2 times the wavelength and 1 times the wavelength as radiation modes. These two current radiation modes also have the characteristic of current reversal, and their radiation fields will also superimpose and destructively interact to a certain extent when they act as radiation sources, which also helps to reduce mutual coupling. All of these factors work together to reduce the coupling between antenna elements of the same frequency or in similar frequency bands, improve isolation, and thus enhance the antenna performance of both the first antenna element 110 and the second antenna element 120.

[0174] Optional, please refer to Figure 5 The second feed source 22 is also used to excite the formation of a fifth resonant mode supporting the fifth frequency band on the second radiator 21. The fifth resonant mode includes a half-wavelength mode of the fifth frequency band. The center frequency of the fifth frequency band is smaller than the center frequency of the second frequency band.

[0175] For details, please refer to Figure 15 The current distribution between the second feed point A2 and the third ground point D3 is or approximately half the wavelength of the fifth frequency band. Specifically, in one phase, the current flows from the second feed point A2 to the third ground point D3; in another phase, the current flows from the third ground point D3 to the second feed point A2. The total electrical length between the second feed point A2 and the third ground point D3 is or approximately half the wavelength of the fifth frequency band.

[0176] This application does not specify the size of the fifth frequency band. Optionally, the fifth frequency band may include, but is not limited to, at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, GPS band, etc.

[0177] Furthermore, the center frequency of the fifth frequency band is less than or equal to the center frequency of the second frequency band. Thus, the second antenna unit 120 can support both the second and fifth frequency bands. For example, the fifth frequency band includes Wi-Fi 2.4G or MHB bands (B3 / B1 / B40 / B41), and the second frequency band includes N78 / N77 bands. Therefore, the second antenna unit 120 can support both Wi-Fi 2.4G or MHB bands (B3 / B1 / B40 / B41) and N78 / N77 bands, enabling one antenna unit to support multiple frequency bands. This promotes miniaturization of the antenna assembly 100 while increasing the number of supported antenna frequency bands.

[0178] Please see Figure 16 Taking a dual-antenna configuration 100, comprising a first antenna element 110 and a second antenna element 120, as an example, the antenna assembly 100 includes a second antenna element 120 and a first antenna element 110. The first antenna element 110 is a single-feed, dual-ground antenna. The second antenna element 120 is a single-feed, single-ground antenna. The first feed point A1 of the first antenna element 110 is located at the center of the first radiator 11, and the two grounding points (first grounding point D1 and second grounding point D2) are symmetrical about the first feed point A1.

[0179] Please see Figure 16 The second feed source 22 is electrically connected to the second radiator 21 at the second feed point A2, and the second feed source 22 excites the second antenna unit 120 to cover the Wi-Fi 2.4G+N78 frequency band. The first feed source 12 covers the GPS L1 / LTE MB+N78 frequency band for the first radiator 11. The first feed source 12 is electrically connected to the first antenna unit 110 at the first feed point A1 to excite the first radiator 11 to cover the GPS L1 / LTE MB frequency band. This means that the different forms of the matching branches switched by the first matching switch M11 in the first matching circuit M1 result in different supported frequency bands, supporting both the GPS-L1 and MB frequency bands. A gap is provided between the first antenna unit 110 and the second antenna unit 120. The width of this gap depends on the actual situation and is not specifically limited in this application. In this embodiment, the first radiator 11 and the second radiator 21 are arranged adjacent to each other at the second feed point A2. In other embodiments, the first radiator 11 can also be arranged adjacent to the third grounding point D3 of the second radiator 21.

[0180] Please see Figure 4 , Figure 4This is the return loss S22 curve of the first antenna element 110. It can be seen that the return loss S11 curve of the first antenna element 110 can cover the GPS-L1 frequency band (the resonant mode formed by resonant point 1 in the figure) + N78 / N77 frequency band (the resonant mode formed by resonant point 2 in the figure). In other words, the first antenna element 110 provided in this application can cover the GPS-L1 + N78 / 77 frequency bands.

[0181] Please see Figure 8 , Figure 8 This is a schematic diagram of the current distribution of the first antenna element 110 in the first resonant mode. The first resonant mode is a loop mode with a wavelength of 2*λ from the first ground point D1 to the second ground point D2. The first ground point D1, the second ground point D2, and the first feed point A1 are strong current points. There is a current reversal point (second current zero point H2) between the second ground point D2 and the first feed point A1, a current reversal point (first current zero point H1) between the first ground point D1 and the first feed point A1, and a current reversal point (current zero point) also exists at the first feed point A1.

[0182] Please see Figure 9 , Figure 9 This is a schematic diagram of the current distribution of the first antenna element 110 in the third resonant mode. The third resonant mode is a full-wavelength (1*λ) ring mode from the first ground point D1 to the second ground point D2. The first ground point D1 and the second ground point D2 are strong current points. The mode characteristic is that there is a current reversal point near the first feed point A1.

[0183] Please see Figure 17 , Figure 17 This is a current simulation diagram of the first antenna element 110 in the third resonant mode. The current intensity, from strongest to weakest, is represented by red, yellow, green, and blue, respectively. The arrows indicate the current direction.

[0184] As shown in the figure, in one phase, the current forming the third resonant mode on the first radiator 11 flows from the second grounding point D2 to the first feed point A1. Since the second grounding point D2 is a return-to-ground position, it exhibits a relatively strong current in the current simulation diagram. Similarly, since the first grounding point D1 is a return-to-ground position, it also exhibits a relatively strong current in the current simulation diagram. The overall current variation conforms to the current mode variation at one wavelength.

[0185] Please see Figure 18 , Figure 18 This is a current simulation diagram of the first antenna element 110 in the first resonant mode. The current intensity, from strongest to weakest, is represented by red, yellow, green, and blue, respectively. The arrows indicate the current direction.

[0186] As can be seen from the figure, in another phase, the current forming the first resonant mode on the first radiator 11 flows from the first ground point D1 to the first current zero point H1, and from the first feed point A1 to the first current zero point H1. Since both the first ground point D1 and the first feed point A1 have low impedance, they have relatively large currents. The overall current change conforms to the current mode change of twice the wavelength.

[0187] The above only outlines the basic mode of radiation operation. The coverage frequency band can be adjusted by tuning the first matching circuit M1, and the specific frequency band is not unique. The above explanation is a relatively easy-to-understand description, but it is not limited to this one explanation.

[0188] Please see Figure 5 , Figure 5 This is the return loss S11 curve of the second antenna unit 120. It can be seen that the return loss S11 curve of the second antenna unit 120 can cover the Wi-Fi 2.4G band (the resonant mode formed by resonant point 1 in the figure) + N78 / N77 band (the resonant mode formed by resonant point 2 in the figure). Specifically, the second matching switch in the second matching circuit M2 switches to different matching branches, allowing the second antenna unit 120 to also cover the B3 band / B1 band / B40 band / B41 band. In other words, the second antenna unit 120 provided in this application can cover the Wi-Fi 2.4G (B3 / 1 / 40 / 41) + N78 / 77 bands.

[0189] Please see Figure 15 , Figure 15 This is a schematic diagram of the current distribution of the second antenna unit 120 in the fifth resonant mode. The fifth resonant mode is a half-wavelength (1 / 2λ) radiation mode from the third grounding point D3 to the second feed point A2. The mode is characterized by the current strength point being at or near the midpoint between the third grounding point D3 and the second feed point A2.

[0190] Please see Figure 14 , Figure 14 This is a schematic diagram of the current distribution of the second antenna unit 120 in the second resonant mode. The second resonant mode is a loop mode with a wavelength of 1*λ from the third grounding point D3 to the second feed point A2. The mode is characterized by a current reversal point (the aforementioned fifth current zero point H5) between the third grounding point D3 and the second feed point A2.

[0191] Please see Figure 19 , Figure 19 This is a simulation diagram of the current in antenna unit 120 under the fifth resonant mode. The current intensity, from strongest to weakest, is represented by red, yellow, green, and blue. The arrows indicate the direction of the current.

[0192] As can be seen from the figure, in one phase, the current forming the fifth resonant mode on the second radiator 21 flows from the third grounding point D3 to the second feed point A2, and the third grounding point D3 is the return point, which has a relatively strong current intensity. The overall current change conforms to the 1 / 2 wavelength current mode change.

[0193] Please see Figure 20 , Figure 20 This is a current simulation diagram of antenna unit 120 in the second resonant mode. The current intensity, from strongest to weakest, is represented by red, yellow, green, and blue. The arrows indicate the current direction.

[0194] As shown in the figure, in another phase, the current forming the second resonant mode on the second radiator 21 flows from the third ground point D3 to the fifth current zero point H5, and from the second feed point A2 to the fifth current zero point H5. The fifth current zero point H5 is closer to the second feed point A2. The third ground point D3, the second feed point A2, and the second ground point D2 all have relatively strong currents. The overall current variation conforms to the current mode variation of one wavelength.

[0195] The above only outlines the basic modes of antenna radiation. Specific coverage frequency bands can be adjusted through tuning and matching branches, and the specific frequency band is not unique. The above explanation is a relatively easy-to-understand method, but it is not limited to this one explanation.

[0196] Please see Figure 21 , Figure 21 This is a simulation diagram of the structure and current when the second antenna unit 120 and the first antenna unit 110 are placed adjacent to each other on the same side of the mobile phone, as provided in this application. The first resonant mode of the first antenna unit 110 supports a first frequency band (N77 / N78 band), and the second resonant mode of the second antenna unit 120 supports a second frequency band (N77 / N78 band). The first radiator 11 has three current reversal points, and the second radiator 21 has one current reversal point.

[0197] Please see Figure 22 , Figure 22 This is a simulation diagram of the structure and current of two IFA antennas placed adjacent to each other at the same operating frequency. It can be seen that neither IFA antenna forms a current zero point. When the two IFA antennas are placed adjacently (operating at the same frequency), the current modes on the antennas are basically the same, the currents on the antenna radiators remain in the same direction, and there is only one coupling path between the antennas, resulting in relatively poor isolation.

[0198] Please see Figure 23 , Figure 23This is a comparison chart (N78 band) of the isolation of the dual-antenna scheme provided in this application with several conventional dual-antenna schemes (including dual IFA, dual CLRH, and dual loop schemes). Curve a1 is the isolation curve of the first antenna element 110 and the second antenna element 120 provided in this application. Curve a2 is the isolation curve between the two left-handed and right-handed composite antennas provided in this application. Curve a3 is the isolation curve between the two IFA antennas provided in this application. Curve a4 is the isolation curve between the two loop antennas provided in this application. The dual-antenna scheme provided in this application has an isolation of greater than or equal to -17.8 dB in the N78 band.

[0199] Other embodiments of this application also include the following antenna structures:

[0200] For example, the first antenna element 110 and the IFA antenna form an adjacent antenna group and operate in the same or similar frequency bands. The first antenna element 110 includes a first radiator 11 and a first feed 12. The first feed 12 is electrically connected to the first radiator 11 and is used to excite the formation of a first resonant mode supporting the first frequency band on the first radiator 11. The current distribution of the first resonant mode forms at least one current zero on the first radiator 11. Reverse currents are formed on both sides of the current zero. The reverse currents cause the radiation field of the first antenna element 110 when it acts as a field source (the coupling field between it and the IFA antenna) to have a superposition and cancellation effect, thereby reducing the coupling to the nearby same-frequency or near-frequency antenna (IFA antenna) and improving the isolation between the antennas (the first antenna element 110 and the IFA antenna).

[0201] For example, the first antenna element 110 and the CLRH antenna form an adjacent antenna group and operate in the same or similar frequency bands. The first antenna element 110 includes a first radiator 11 and a first feed 12. The first feed 12 is electrically connected to the first radiator 11 and is used to excite the formation of a first resonant mode supporting the first frequency band on the first radiator 11. The current distribution of the first resonant mode forms at least one current zero on the first radiator 11. Reverse currents are formed on both sides of the current zero. The reverse currents cause the radiation field of the first antenna element 110 when it acts as a field source (the coupling field between it and the CLRH antenna) to have a superposition and cancellation effect, thereby reducing the coupling to the nearby same-frequency or near-frequency antenna (CLRH antenna) and improving the isolation between the antennas (first antenna element 110 and CLRH antenna).

[0202] For example, the first antenna element 110 and the loop antenna form an adjacent antenna group and operate in the same or similar frequency bands. The first antenna element 110 includes a first radiator 11 and a first feed 12. The first feed 12 is electrically connected to the first radiator 11 and is used to excite the formation of a first resonant mode supporting the first frequency band on the first radiator 11. The current distribution of the first resonant mode forms at least one current zero on the first radiator 11. Reverse currents are formed on both sides of the current zero. The reverse currents cause the radiation field of the first antenna element 110 when it acts as a field source (the coupling field between it and the loop antenna) to have a superposition and cancellation effect, thereby reducing the coupling to the nearby same-frequency or near-frequency antenna (loop antenna) and improving the isolation between the antennas (the first antenna element 110 and the loop antenna).

[0203] For example, two first antenna elements 110 form adjacent antenna groups and operate in the same or similar frequency bands. The first antenna element 110 includes a first radiator 11 and a first feed 12. The first feed 12 is electrically connected to the first radiator 11 and is used to excite the formation of a first resonant mode supporting the first frequency band on the first radiator 11. The current distribution of the first resonant mode forms at least one current zero on the first radiator 11. Reverse currents are formed on both sides of the current zero. The reverse currents cause the radiation field of the first antenna element 110 when it acts as a field source (the coupling field between it and the other first antenna element 110) to have a superposition and cancellation effect, thereby reducing the coupling to the adjacent antenna (the other first antenna element 110) at the same or near frequency, and thus improving the isolation between the antennas (between the two first antenna elements 110).

[0204] For example, two second antenna elements 120 form adjacent antenna groups and operate in the same or similar frequency bands.

[0205] For example, the second antenna element 120 and the IFA antenna form an adjacent antenna group and operate in the same or similar frequency bands.

[0206] For example, the second antenna element 120 and the CLRH antenna form an adjacent antenna group and operate in the same or similar frequency bands.

[0207] For example, the second antenna element 120 and the loop antenna form an adjacent antenna group and operate in the same or similar frequency bands.

[0208] The same frequency band can be a frequency band that completely overlaps or partially overlaps with the first frequency band and the second frequency band. For example, the frequency bands that overlap in the first part include the N78 and N77 frequency bands. The frequency bands that partially overlap include the N78 and N77 frequency bands. The adjacent frequency bands are, for example, adjacent frequency bands in the frequency band allocation table, such as the B3 and B40 frequency bands.

[0209] Please see Figure 24aThe antenna assembly 100 is disposed on the top frame 321. The antenna assembly 100 includes a first antenna element 110 and a second antenna element 120.

[0210] Please see Figure 24b The antenna assembly 100 is disposed on the first side frame 322. The antenna assembly 100 includes a first antenna element 110 and a second antenna element 120. Alternatively, the antenna assembly 100 may also be disposed on the second side frame 323.

[0211] Please see Figure 24c The antenna assembly 100 is disposed on the bottom frame 324. The antenna assembly 100 includes a first antenna element 110 and a second antenna element 120.

[0212] The dual-antenna scheme provided in this application has better isolation than other dual-antenna schemes when operating at the same frequency in the N78 band. The dotted line in the figure represents the co-frequency isolation of the conventional antenna scheme with two IFAs placed on the same side. It can be seen that the co-frequency isolation of the proposed dual-antenna scheme is improved from 10.8dB to 17.8dB compared to the traditional dual-IFA scheme.

[0213] The antenna scheme proposed in this application has at least two advantages in isolation compared to the example dual-IFA scheme. Firstly, the first antenna element 110 is constructed with a centrally symmetrical structure, and the first feed point A1 is located at the center of the structure. This results in a centrally symmetrical distribution of current on the first antenna element 110, with the currents on both sides of the first feed point A1 in opposite directions. It can be considered that when the first antenna element 110 acts as a field source, its own reverse current radiation field will have a superposition and cancellation effect, reducing coupling to adjacent antennas and thus improving the isolation between antennas. Secondly, the proposed dual-antenna scheme on the same side constructs loop modes of 1 wavelength and 2 wavelength as radiation modes when the second antenna element 120 and the first antenna element 110 operate in the same operating frequency band (N78). These two current radiation modes also have the characteristic of current reversal, and when they act as radiation sources, their radiation fields will also superimpose and cancel each other to a certain extent, which also helps to reduce mutual coupling. These two points together reduce the coupling between the first antenna element 110 and the second antenna element 120 and improve the isolation between them.

[0214] Commonly used multi-antenna decoupling methods are difficult to implement in the space-constrained environment of mobile phones. The antenna scheme proposed in this application reduces the coupling between antennas and improves isolation by constructing a specific antenna structure and current mode.

[0215] Please see Figure 25 , Figure 25This is an efficiency graph of the first antenna element 110 and the second antenna element 120 in a relatively complex system environment. In this complex environment with very little clearance, both the second antenna element 120 and the first antenna element 110 exhibit good efficiency (greater than or equal to -4dB). Curve a1 is the overall system efficiency curve of the first antenna element 110 provided in this application. Curve a2 is the overall system efficiency curve of the second antenna element 120 provided in this application.

[0216] This application proposes a novel dual-antenna scheme. By constructing a symmetrical antenna structure with a center feed and two sides grounded, a reverse current symmetrically distributed about the center is excited on the radiator, reducing the coupling effect on adjacent antennas when acting as a radiation source. Based on the symmetrical antenna structure with the center feed and two sides grounded, loop current modes of 1 wavelength and 2 wavelength are constructed for adjacent antennas, respectively. The current reversal characteristic of the loop mode is used to further improve isolation. The significant feature of the antenna structure provided in this application is the center feed and two sides grounded. This structural feature is conducive to realizing the distribution of reverse current and the construction of loop current modes, thereby achieving the effect of improving isolation. The isolation of adjacent dual antennas is improved by 7dB compared to conventional schemes, reducing mutual interference between antennas and improving the active performance of the antennas. This application improves the isolation between antennas in terms of mechanism, reduces the requirement for antenna spacing, makes more reasonable use of overall space, and is more conducive to antenna layout.

[0217] Please see Figure 16 , Figure 16 This is a schematic diagram of the structure of the first antenna unit 110 provided in this application, which is electrically connected to the second matching circuit M2 and the third matching circuit M3 at both ends respectively.

[0218] The first antenna element 110 is a symmetrical antenna with a single feed point and dual grounding. The first grounding point D1 has a second matching circuit M2, and the second grounding point D2 has a third matching circuit M3. The capacitive and inductive values ​​in the first matching circuit M1, the second matching circuit M2, and the third matching circuit M3 are adjusted. Even without using a switch, the first antenna element 110 can simultaneously support three resonant modes, achieving tri-band wide coverage of GPS L1+N77 / 78+Wi-Fi 5G. This increases the number of frequency bands supported by the antenna assembly 100 without increasing the length of the first radiator 11.

[0219] Please see Figure 26 , Figure 26The results show the efficiency simulation of the tri-band mode of the first antenna unit 110 provided in this application, with its two ends electrically connected to the second matching circuit M2 and the third matching circuit M3, respectively. Curve a1 is the radiation efficiency curve of the first antenna unit 110 provided in this application. Curve a2 is the overall system efficiency curve of the second antenna unit 120 provided in this application. It can be seen that the first antenna unit 110 can support GPS L1 (resonant mode at resonant point 1) + N77 / 78 (resonant mode at resonant point 2) + Wi-Fi 5G (resonant mode at resonant point 3). At the same time, the antenna assembly 100 provided in this embodiment can also have high radiation efficiency in the MHB ultra-wideband.

[0220] Please see Figure 27a The antenna assembly 100 is disposed on the top frame 321. The antenna assembly 100 includes a first antenna element 110.

[0221] Please see Figure 27b The antenna assembly 100 is disposed on the first side frame 322. The antenna assembly 100 includes a first antenna element 110. Alternatively, the antenna assembly 100 may also be disposed on the second side frame 323.

[0222] Please see Figure 27c The antenna assembly 100 is disposed on the bottom frame 324. The antenna assembly 100 includes a first antenna element 110.

[0223] For other implementations, please refer to Figure 27d There are multiple antenna assemblies 100. For example, there may be two or three antenna assemblies 100. Each antenna assembly 100 includes a first antenna element 110. The three antenna assemblies 100 are respectively located on the top frame 321, the first side frame 322, and the bottom frame 324.

[0224] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. An antenna assembly, characterized in that, include: The first antenna element includes a first radiator and a first feed source. The first feed source is electrically connected to the first radiator. The first feed source is used to excite the formation of a first resonant mode supporting a first frequency band on the first radiator. The current distribution of the first resonant mode forms at least one current zero point on the first radiator. and The second antenna unit is disposed adjacent to the first antenna unit. The second antenna unit includes a second radiator and a second feed source. The second feed source is electrically connected to the second radiator. The second feed source is used to excite the formation of a second resonant mode supporting a second frequency band on the second radiator. The difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than the range of a first preset frequency band.

2. The antenna assembly as claimed in claim 1, characterized in that, The first radiator includes a first feed point and a first ground point; the first feed point is electrically connected to the first feed source, and the first ground point is used to electrically connect to a reference ground; The current distribution of the first resonant mode forms a first current zero point on the first radiator; The first current zero point is located between the first feed point and the first ground point.

3. The antenna assembly as described in claim 2, characterized in that, The first radiator also includes a second grounding point, which is located on opposite sides of the first grounding point, and the second grounding point is used to electrically connect to the reference ground. The current distribution of the first resonant mode on the first radiator also forms a second current zero point; the second current zero point is located between the first feed point and the second ground point.

4. The antenna assembly as described in claim 3, characterized in that, The distance between the center positions of the first power supply point and the first grounding point and the second grounding point is less than or equal to a first preset distance.

5. The antenna assembly as described in claim 4, characterized in that, The first resonant mode includes the twice-wavelength mode of the center frequency of the first frequency band.

6. The antenna assembly as claimed in claim 4, characterized in that, The first feed source is also used to excite the formation of a third resonant mode supporting the third frequency band on the first radiator. The third resonant mode includes a wavelength mode at the center frequency of the third frequency band, wherein the center frequency of the third frequency band is less than or equal to the center frequency of the first frequency band.

7. The antenna assembly as claimed in claim 6, characterized in that, The first antenna unit further includes a first matching circuit, which is electrically connected between the first feed point and the first feed source. The first matching circuit includes a matching switch, a first matching branch, and a second matching branch. The third frequency band includes a first sub-frequency band and a second sub-frequency band. When the first matching switch is switched to the first matching branch electrically connected to the first feed point, a first resonant mode supporting the first sub-frequency band is formed on the first radiator. When the first matching switch is switched to the second matching branch electrically connected to the first feed point, a first resonant mode supporting the second sub-band is formed on the first radiator.

8. The antenna assembly as claimed in claim 6, characterized in that, The first antenna unit further includes a second matching circuit, which is electrically connected between the first ground point and the reference ground; and / or, the second antenna unit further includes a third matching circuit, which is electrically connected between the second ground point and the reference ground; The first radiator also forms a fourth resonant mode supporting the fourth frequency band under the excitation of the first feed source, wherein the center frequency of the fourth frequency band is greater than or equal to the center frequency of the first frequency band.

9. The antenna assembly as claimed in claim 1, characterized in that, The first radiator includes a first feed point, a first ground point, and a second ground point. The first feed point is electrically connected to the first feed source. The second ground point and the first ground point are located on opposite sides of the first feed point. The distance between the center positions of the first power supply point and the first grounding point and the second grounding point is less than or equal to the second preset distance; The current distribution of the first resonant mode forms a fourth current zero point at the first feed point.

10. The antenna assembly according to any one of claims 1 to 9, characterized in that, The second radiator includes a third grounding point, a second feed point, and a first free end. The second feed point is electrically connected to the second feed source, and the current of the second resonant mode is distributed between the third grounding point and the first free end.

11. The antenna assembly as described in any one of claims 1 to 9, characterized in that, The second radiator includes a third grounding point and a second feed point, the second feed point being electrically connected to the second feed source, and the current distribution of the second resonant mode including the formation of a fifth current zero point between the third grounding point and the second feed point.

12. The antenna assembly as claimed in claim 11, characterized in that, The second resonant mode includes the wavelength-1 mode at the center frequency of the second frequency band.

13. The antenna assembly as described in any one of claims 1 to 9, characterized in that, The second feed source is also used to excite the formation of a fifth resonant mode supporting the fifth frequency band on the second radiator. The fifth resonant mode includes a half-wavelength mode of the fifth frequency band, and the center frequency of the fifth frequency band is smaller than the center frequency of the second frequency band.

14. An electronic device, characterized in that, The device includes a frame and an antenna assembly as described in any one of claims 1 to 13. The frame includes a top frame, a first side frame, a bottom frame, and a second side frame connected in sequence. The antenna assembly is disposed on any one of the top frame, the first side frame, the bottom frame, and the second side frame.

Images