Antenna assembly and electronic device

Abstract

This application discloses an antenna assembly and electronic device. A first radiator includes a first end, a feed point, and a second end. A second radiator is parallel to and opposite to the first radiator, forming a coupling gap between them. The second radiator includes a third end, a ground point, and a fourth end arranged sequentially. One end of a tuning circuit is electrically connected to the ground point, and the other end is grounded. The tuning circuit is used to increase the electrical length of the second radiator. Under the excitation of a signal source, the second radiator generates a first resonant current flowing from the third end to the ground point and then to ground, and a second resonant current flowing from the fourth end to the ground point and then to ground. The modes of both the first and second resonant currents are 1 / 4 wavelength modes of a first frequency band, and the length of the second radiator is (1 / 6–1 / 4) wavelength of the first frequency band. The antenna assembly and electronic device provided in this application achieve miniaturization and save space.

Description

Technical Field

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

[0002] As the number of communication frequency bands increases, the number of antennas on electronic devices also increases. However, space on electronic devices is limited. How to reduce the size of antenna components to save space has become a technical problem that needs to be solved. Summary of the Invention

[0003] This application provides an antenna assembly with reduced size to save space, and an electronic device having the antenna assembly.

[0004] This application provides an antenna assembly, including:

[0005] The first radiator includes a first end, a feed point, and a second end;

[0006] A signal source, electrically connected to the feed point, is used to provide an excitation signal; and

[0007] A second radiator is arranged parallel to and opposite to the first radiator, forming a coupling gap between them. The second radiator includes a third end, a grounding point, and a fourth end arranged sequentially, and a tuning circuit. One end of the tuning circuit is electrically connected to the grounding point, and the other end is grounded. The tuning circuit is used to increase the electrical length of the second radiator. Under the excitation of the signal source, the second radiator forms a first resonant mode supporting a first frequency band. The resonant current of the first resonant mode includes a first resonant current flowing from the third end to the grounding point and then to the ground, and a second resonant current flowing from the fourth end to the grounding point and then to the ground. The modes of the first and second resonant currents are both 1 / 4 wavelength modes of the first frequency band, and the length of the second radiator is (1 / 6 to 1 / 4) wavelength of the first frequency band.

[0008] This application also provides an electronic device including the aforementioned antenna assembly.

[0009] The antenna assembly and electronic device provided in this application are designed such that the first radiator includes a first end, a feed point, and a second end; a signal source is electrically connected to the feed point, and the signal source is used to provide an excitation signal; the second radiator is parallel to and opposite to the first radiator, and a coupling gap is formed between the second radiator and the first radiator; the first radiator and the second radiator are staggered parallel couplings; the second radiator includes a third end, a ground point, and a fourth end arranged sequentially, and the ground point is grounded through a tuning circuit, which is used to increase the electrical length of the second radiator; the second radiator forms a first resonant mode supporting a first frequency band under the excitation of the signal source, and the resonant current of the first resonant mode includes a current flowing from the third end to the ground point and through the ground. The first resonant current flows to the ground point and the second resonant current flows from the fourth end to the ground point and then to the ground point. The modes of the first resonant current and the second resonant current are both 1 / 4 wavelength modes of the first frequency band. The length of the second radiator is (1 / 6-1 / 4) wavelength of the first frequency band. Through the above design, when the length of the second radiator is shortened to 1 / 2-1 / 3 of its original length, it can still have sufficient electrical length to generate a 1 / 4 wavelength current flowing from the third end to the ground point and then to the ground point, and a 1 / 4 wavelength current flowing from the fourth end to the ground point and then to the ground point, thereby generating the first resonant mode that supports the first frequency band, so as to reduce the size of the antenna assembly and save the space occupied. Attached Figure Description

[0010] 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.

[0011] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0012] Figure 2 This is a partial structural disassembly diagram of the electronic device provided in the embodiments of this application;

[0013] Figure 3 This is a top view of the antenna assembly provided in the embodiments of this application disposed on an electronic device;

[0014] Figure 4 This is a schematic diagram of the structure of an antenna assembly provided in an embodiment of this application;

[0015] Figure 5 This is a current distribution diagram of an antenna assembly in the first resonant mode provided in an embodiment of this application;

[0016] Figure 6 This is a current distribution diagram of an antenna assembly in the second resonant mode provided in an embodiment of this application;

[0017] Figure 7This is a schematic diagram of another location of the first radiator in the antenna assembly provided in this application embodiment;

[0018] Figure 8 This is a structural schematic diagram of another position of the first radiator in the antenna assembly provided in the embodiments of this application;

[0019] Figure 9 This is a current distribution diagram of an antenna assembly in the third resonant mode provided in an embodiment of this application;

[0020] Figure 10 This is a current distribution diagram of an antenna assembly in the fourth resonant mode provided in an embodiment of this application;

[0021] Figure 11 This is a schematic diagram of a tuning circuit provided in an embodiment of this application;

[0022] Figure 12 This is a schematic diagram of another location on an electronic device provided in an embodiment of this application;

[0023] Figure 13 This is a schematic diagram of the antenna assembly provided in this application embodiment being disposed on the side of an electronic device;

[0024] Figure 14 These are the S-parameter curves and efficiency curves of the antenna assembly provided in the embodiments of this application;

[0025] Figure 15 This is a comparison chart of the S-parameter curves of the miniaturized LB antenna with misaligned coupling feed and the T-shaped direct feed antenna provided in the embodiments of this application.

[0026] Figure 16 This is a comparison chart of the efficiency curves of the miniaturized LB antenna with misaligned coupling feed and the T-shaped direct feed antenna provided in the embodiments of this application.

[0027] Figure 17 This is the S-parameter curve of the antenna assembly provided in the embodiments of this application when the tuning circuit switches the LB sub-band.

[0028] Reference numerals: Electronic device 1000; Antenna assembly 100; Display screen 200; Middle frame 300; Back cover 400; Middle plate 310; Frame 320; Top edge 321; First side edge 322; Bottom edge 323; Second side edge 324; First radiator 10; Signal source 30; Second radiator 20; Tuning circuit 40; First terminal A; Feed point B; Second terminal C; Third terminal D; Ground point E; Fourth terminal F; First current zero point Q1; Second current zero point Q2; First dividing point H; Second dividing point J; Matching circuit M1; Switching unit K; Tuning branch T; Reference ground 50. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Please see Figure 1 , Figure 1 This 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.

[0033] Please see Figure 2 The electronic device 1000 includes an antenna assembly 100. The antenna assembly 100 can improve antenna efficiency.

[0034] Please see Figure 2Taking a mobile phone as an example, the working environment of the antenna assembly 100 is illustrated below. The electronic device 1000 includes a display screen 200, a mid-frame 300, and a back cover 400 arranged sequentially along its thickness. The mid-frame 300 includes a mid-plate 310 and a frame 320 surrounding the mid-plate 310. Of course, in other embodiments, the electronic device 1000 may not have a mid-plate 310. The display screen 200, mid-plate 310, and back cover 400 are stacked sequentially, forming receiving spaces 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 the motherboard, camera module, receiver module, battery, and various sensors. One side of the frame 320 surrounds the edge of the display screen 200, and the other side of the frame 320 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 middle plate 310 are an integral structure, while the frame 320 and the back cover 400 can be separate structures. The above describes the working environment of the antenna assembly 100 using a mobile phone as an example, but the antenna assembly 100 of this application is not limited to the above working environment.

[0035] Please see Figure 3 The frame 320 includes a top edge 321, a first side edge 322, a bottom edge 323, and a second side edge 324 connected sequentially from end to end. The top edge 321 and the bottom edge 323 are arranged opposite to each other, and the first side edge 322 and the second side edge 324 are arranged opposite to each other.

[0036] Among them, the top edge 321 is the side away from the ground when the user holds and uses the electronic device 1000, and the bottom edge 323 is the side facing the ground when the user holds and uses the electronic device 1000.

[0037] The border 320 is generally rectangular. In one optional embodiment, the top edge 321 and the bottom edge 323 are the shorter sides of the border, and the first side edge 322 and the second side edge 324 are the longer sides of the border. In other embodiments, the electronic device 1000 can also be a foldable electronic device, where the top edge 321 and the bottom edge 323 are the shorter sides of the border when unfolded, and the first side edge 322 and the second side edge 324 are the longer sides of the border when unfolded. In other embodiments, the top edge 321 and the bottom edge 323 can also be the longer sides of the border, and the first side edge 322 and the second side edge 324 can also be the shorter sides of the border 320. The length of the shorter side is less than the length of the longer side. Furthermore, the lengths of the top edge 321 and the first side edge 322 can also be the same.

[0038] Please see Figure 4 The antenna assembly 100 provided in this application embodiment includes a first radiator 10, a signal source 30, a second radiator 20, and a tuning circuit 40.

[0039] The first radiator 10 serves as the port for transmitting and receiving radio frequency signals in the antenna assembly 100. The radio frequency signals are transmitted in the air medium as electromagnetic waves. This application does not specifically limit the material of the first radiator 10. Optionally, the first radiator 10 may be made of a conductive material, including but not limited to conductive materials such as metals and alloys.

[0040] This application does not specifically limit the shape of the first radiator 10. For example, the shape of the first radiator 10 includes, but is not limited to, strip, sheet, rod, coating, film, etc. Figure 4 The first radiator 10 shown is merely an example and does not limit the shape of the first radiator 10 provided in this application. In this embodiment, the first radiator 10 is always strip-shaped. This application does not limit the extension trajectory of the first radiator 10. Optionally, the first radiator 10 may extend along a straight line, a curve, or a bend. In this embodiment, the first radiator 10 is straight. In other embodiments, the first radiator 10 may also extend along a bend or other trajectory. The first radiator 10 described above may be a line of uniform width along its extension trajectory, or it may be a strip of varying width, such as one with a gradually changing width or a widened region.

[0041] This application does not specifically limit the form of the first radiator 10. Optionally, the form of the first radiator 10 includes, but is not limited to, a metal frame 320, a metal frame embedded in a plastic frame 320, a metal first radiator 10 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 application, the first radiator 10 is taken as a part of the metal frame 320.

[0042] Please see Figure 4 The first radiator 10 includes a first end A, a feed point B, and a second end C. Both the first end A and the second end C are disconnected from other structures. The first end A and the second end C can also be referred to as free ends. This application does not specify the exact location of the feed point B between the first end A and the second end C.

[0043] Optionally, the power supply point B is located at the first terminal A, or at the second terminal C, or between the first terminal A and the second terminal C.

[0044] The signal source 30 is electrically connected to the feed point B, and the signal source 30 is used to provide an excitation signal.

[0045] The signal source 30 includes, but is not limited to, radio frequency transceiver chips. The signal source 30 is used to provide radio frequency excitation current, i.e., the excitation signal mentioned above.

[0046] In this embodiment, the signal source 30 is mounted on the motherboard. The electrical connection between the signal source 30 and the feed point B can be, but is not limited to, direct soldering, or indirect methods such as coaxial cable, microstrip line, conductive spring, conductive adhesive, or coupling connection. Specifically, the signal source 30 is electrically connected to the feed point B via a feed spring (conductive spring) mounted on the motherboard.

[0047] The second radiator 20 can refer to the first radiator 10. Optionally, the first radiator 10 is part of the metal frame 320 of the electronic device, and the second radiator 20 is a metal insert inside the metal frame 320. Alternatively, both the first radiator 10 and the second radiator 20 can be metal inserts of the electronic device 1000.

[0048] The second radiator 20 is parallel to and opposite to the first radiator 10. Insulating material may be filled between the second radiator 20 and the first radiator 10. A coupling gap is formed between the second radiator 20 and the first radiator 10. Taking a long strip shape as an example, the direction in which the first radiator 10 and the second radiator 20 face each other is perpendicular to the extension direction of the first radiator 10. In other words, the first radiator 10 and the second radiator 20 are misaligned coupling antennas relative to an end-to-end mouth-to-mouth antenna. The first radiator 10 and the second radiator 20 are face-to-face.

[0049] Please see Figure 4 The second radiator 20 includes a third end D, a grounding point E, and a fourth end F arranged sequentially. The third end D and the fourth end F are both ends disconnected from other structures. The third end D and the fourth end F can also be referred to as free ends. This application does not specifically limit the position of the grounding point E between the third end D and the fourth end F. Optionally, the grounding point E is located near the center point of the third end D and the fourth end F.

[0050] Please see Figure 4One end of the tuning circuit 40 is electrically connected to the grounding point E, and the other end of the tuning circuit 40 is grounded. The tuning circuit 40 is used to increase the electrical length of the second radiator 20. Further, when the resonant current on the second radiator 20 is grounded through the tuning circuit 40, the tuning circuit 40 can increase the electrical length of the resonant current. Optionally, the tuning circuit 40 includes at least an inductor L, which is used to increase the electrical length of the resonant current. Of course, the tuning circuit 40 may also include small capacitors, resistors, and other devices.

[0051] Please see Figure 5 The second radiator 20, under the excitation of the signal source 30, forms at least a first resonant mode supporting the first frequency band. The resonant current of the first resonant mode includes a first resonant current flowing from the third terminal D to the grounding point E and then to the ground, and a second resonant current flowing from the fourth terminal F to the grounding point E and then to the ground. Of course, due to the periodicity of the current, the direction of the resonant current of the first resonant mode can also be opposite to the current direction described above.

[0052] Both the first resonant current mode and the second resonant current mode are 1 / 4 wavelength modes of the first frequency band. If the grounding point E of the second radiator 20 is directly grounded, then the electrical length of the second radiator 20 is 1 / 2 wavelength of the first frequency band, so as to realize the formation of a first resonant current in 1 / 4 wavelength mode and a second resonant current in 1 / 4 wavelength mode on the second radiator 20.

[0053] In this embodiment, an inductor L is grounded at grounding point E, and this inductor L is a large inductor. When the first resonant current passes through the inductor L, the inductor L increases the electrical length of the first resonant current. When the second resonant current passes through the inductor L, the inductor L increases the electrical length of the second resonant current. The inductor L makes the length of the second radiator 20 approximately (1 / 6 to 1 / 4) wavelength of the first frequency band. The electrical length of the first resonant current from the third terminal D to grounding point E to the inductor L is approximately 1 / 4 wavelength of the first frequency band, and the electrical length of the second resonant current from the fourth terminal F to grounding point E to the inductor L is approximately 1 / 4 wavelength of the first frequency band. Thus, the length of the second radiator 20 is reduced to 1 / 2 to 1 / 3 of its original length (1 / 2 wavelength), achieving miniaturization of the antenna assembly 100.

[0054] This application does not impose a specific limitation on the inductance value of the inductor L. For example, when the first frequency band is the LB band, the inductance value of the inductor L can be 10nh.

[0055] Generally, in order to support the required frequency band, such as the LB band, it is necessary to generate a resonant mode that supports the required frequency band, such as generating a 1 / 4 wavelength mode (fundamental mode) of the LB band on the second radiator 20. Generally, the length of a low-frequency antenna is about 50mm. However, when the electronic device 1000 is a mobile phone, the space on the mobile phone is limited. If the space occupied by the LB band is too large, it will lead to the compression of the space of other antennas. Therefore, miniaturization of the antenna assembly 100 becomes an urgent problem to be solved.

[0056] In this embodiment, by reducing the length of the second radiator 20 to 1 / 2-1 / 3 of its original length, the antenna assembly 100 is excited to generate a resonant current that passes through the grounding point E. An inductor L is placed on the path through the grounding point E. The inductor L can compensate for the reduction in electrical length caused by the shortening of the second radiator 20, so that the electrical lengths of the first resonant current and the second resonant current both meet 1 / 4 wavelength of the required supported frequency band. This ensures that a first resonant mode supporting the first frequency band is formed on the antenna assembly 100, thereby achieving miniaturization of the antenna assembly 100 while ensuring that the antenna assembly 100 can support the first frequency band.

[0057] This application does not limit 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.

[0058] The antenna assembly 100 and electronic device 1000 provided in this application are designed such that the first radiator 10 includes a first end A, a feed point B, and a second end C. A signal source 30 is electrically connected to the feed point B and is used to provide an excitation signal. The second radiator 20 is parallel to and opposite to the first radiator 10, and a coupling gap is formed between the second radiator 20 and the first radiator 10. The first radiator 10 and the second radiator 20 are staggered parallel couplings. The second radiator 20 includes a third end D, a ground point E, and a fourth end F arranged sequentially. The ground point E is grounded through an inductor L, which is used to increase the electrical length of the second radiator 20. Under the excitation of the signal source 30, the second radiator 20 forms a first resonant mode supporting a first frequency band. The resonant current of the first resonant mode includes current from... The first resonant current flows from the third terminal D to the ground point E and then to the ground, and the second resonant current flows from the fourth terminal F to the ground point E and then to the ground. The modes of the first and second resonant currents are both 1 / 4 wavelength modes of the first frequency band. The length of the second radiator 20 is (1 / 6-1 / 4) wavelength of the first frequency band. Through the above design, even when the length of the second radiator 20 is shortened to 1 / 2-1 / 3 of its original length, it still has sufficient electrical length to generate a 1 / 4 wavelength current flowing from the third terminal D to the ground point E and then to the ground, and a 1 / 4 wavelength current flowing from the fourth terminal F to the ground point E and then to the ground, thereby generating the first resonant mode that supports the first frequency band, so as to reduce the size of the antenna assembly 100 and save the space it occupies.

[0059] The following embodiments take the LB band as an example. The LB antenna is relatively long, so miniaturization of the LB band can save more space.

[0060] In the first resonant mode, the first radiator 10 and the signal source 30 are equivalent to the excitation source of the second radiator 20. Through coupling excitation, the first resonant mode is generated on the second radiator 20, forming the first resonant current and the second resonant current distribution.

[0061] Furthermore, a first distributed current is also formed on the first radiator 10. When the first radiator 10 is opposite to the third terminal D to the grounding point E on the second radiator 20, the direction of the first distributed current is the same as the direction of the first resonant current. Moreover, the intensity of the first resonant current is much greater than the direction of the first distributed current.

[0062] In other words, the first resonant mode is mainly a 1 / 4 wavelength mode from the third terminal D to the ground point E and a reverse 1 / 4 wavelength mode from the fourth terminal F to the ground point E, accompanied by a weak current flowing from the first terminal A of the first radiator 10 to the second terminal C.

[0063] In the first resonant mode, the current intensity of the first resonant current is greater than that of the second resonant current. In other words, the resonant frequency of the first resonant current determines the center frequency of the first frequency band. The first resonant current makes the main contribution to the radiation of the first resonant mode.

[0064] Furthermore, the second radiator 20 also forms a second resonant mode supporting the second frequency band under the excitation of the signal source 30.

[0065] Please see Figure 6 The resonant current of the second resonant mode includes a second resonant current flowing from the third terminal D to the fourth terminal F. Of course, due to the periodicity of the current, the direction of the resonant current in the second resonant mode can also be opposite to the direction of the current described above.

[0066] The second resonant current operates in a half-wavelength mode within the second frequency band. In other words, the electrical length between the third terminal D and the fourth terminal F is approximately half the wavelength of the second frequency band. The center frequency of the second frequency band is greater than the center frequency of the first frequency band.

[0067] This application does not limit the second frequency band. Optionally, the second frequency band includes, but is not limited to, at least one of the following: MHB band (1-3GHz), UHB band (greater than 3GHz), Wi-Fi band, GPS band, etc. In this embodiment, the second frequency band is taken as the Wi-Fi-2.4G band or the N41 band. In this way, the antenna assembly 100 can simultaneously cover the LB band + Wi-Fi-2.4G band / N41 band.

[0068] For both the first and second resonant modes, the antenna assembly 100 is a T-shaped antenna, and the feeding method is coupled feeding. The first radiator 10 and the signal source 30 function as exciters.

[0069] The first resonant mode is the high-mode radiating mode of the T-shaped antenna, and the second resonant mode is the high-mode balanced mode of the T-shaped antenna. Generally, after generating the high-mode radiating mode and the high-mode balanced mode, the antenna assembly 100 experiences a significant efficiency improvement, thereby increasing the radiation efficiency (wave boost) within the antenna band. Therefore, the generation of the second resonant mode can effectively improve the efficiency of the first frequency band supported by the first resonant mode, compensating for the efficiency problem caused by the compensation electrical length of the inductor element L. This allows the antenna assembly 100 to achieve low-frequency miniaturization while also improving the efficiency of the LB frequency band.

[0070] In the second resonant mode, the intensity of the resonant current from ground point E to the fourth terminal F is greater than the intensity of the resonant current from the third terminal D to ground point E. In other words, the resonant frequency of the resonant current from ground point E to the fourth terminal F (the 1 / 4 wavelength mode current from ground point E to the fourth terminal F) determines the center frequency of the second frequency band. The resonant current from ground point E to the fourth terminal F makes the main contribution to the radiation of the second resonant mode.

[0071] In a typical point-to-point antenna, such as an antenna assembly 100 where a coupling gap is formed between the second end C of the first radiator 10 and the third end D of the second radiator 20, the grounding point E is grounded through an inductor L with a large inductance, increasing the overall input impedance of the antenna. This impedance increases with higher frequencies, preventing the antenna assembly 100 from generating the second resonant mode described in this application, thus failing to achieve the efficiency improvement effect of the second resonant mode on the first frequency band. However, in this application, by using the first radiator 10 and the signal source 30 as excitation sources, and by paralleling and staggering the coupling between the first radiator 10 and the second radiator 20, the coupling between them is increased compared to a point-to-point antenna, thereby promoting the generation of both the first and second resonant modes by the signal source 30.

[0072] The difference between the resonant current in the second resonant mode and the resonant current in the first resonant mode is that the resonant current in the first resonant mode is grounded through the inductor L, while the resonant current in the second resonant mode is not grounded through the inductor L. Therefore, the inductor L does not affect the resonant current in the second resonant mode.

[0073] Furthermore, a second distributed current is also formed on the first radiator 10. When the first radiator 10 is opposite to the third terminal D to the grounding point E on the second radiator 20, the direction of the second distributed current is the same as the direction of the resonant current between the third terminal D and the grounding point E. Moreover, the intensity of the resonant current between the third terminal D and the grounding point E is much greater than the direction of the second distributed current.

[0074] In other words, the second resonant mode is mainly a half-wavelength mode from the third terminal D to the fourth terminal F, accompanied by a weak current from the first terminal A to the second terminal C of the first radiator 10.

[0075] This application does not specify the positional relationship between the first radiator 10 and the second radiator 20. The positional relationship between the first radiator 10 and the second radiator 20 is illustrated below with reference to the accompanying drawings.

[0076] Please see Figure 7 and Figure 8The orthographic projection of the second end C in the target direction is located between the third end D and the grounding point E. The orthographic projection of the first end A in the target direction is located between the third end D and the grounding point E, or the orthographic projection of the first end A in the target direction is located on the side of the third end D away from the grounding point E. The target direction is perpendicular to the extension direction of the second radiator 20. In other words, the first radiator 10 can be completely opposite to the second radiator 20, or it can be partially opposite to the second radiator 20. Both methods can ensure a large coupling between the first radiator 10 and the second radiator 20, so as to excite higher frequency modes, such as the second resonant mode or a higher frequency resonant mode. When the first radiator 10 is completely opposite to the second radiator 20, the length of the first radiator 10 and the second radiator 20 in the extension direction is also shortened, realizing the miniaturization of the antenna assembly 100.

[0077] Optional, please refer to Figure 8 The length of the first radiator 10 directly opposite the second radiator 20 is greater than or equal to half the total length of the first radiator 10. When the length of the first radiator 10 directly opposite the second radiator 20 is less than half the total length of the first radiator 10, the coupling between the first radiator 10 and the second radiator 20 is too small, making it impossible to excite higher frequency modes and higher frequency resonant modes.

[0078] Further, please refer to Figure 8 The first radiator 10 and the second radiator 20, under the excitation of the signal source 30, jointly form a third resonant mode supporting the third frequency band.

[0079] The third resonant mode differs from the first and second resonant modes in that both the first radiator 10 and the second radiator 20 participate in the transmission and reception of electromagnetic waves. In the first and second resonant modes, the first radiator 10 acts as a feeding structure, while the second radiator 20 participates in the transmission and reception of electromagnetic waves. Therefore, in the third resonant mode, resonant currents are generated in both the first radiator 10 and the second radiator 20.

[0080] The position of the feed point B on the first radiator 10 will change the current distribution on the first radiator 10 and the current distribution on the second radiator 20, as well as change the resonant frequency of the third resonant mode.

[0081] For details, please refer to Figure 9 The resonant current of the third resonant mode has at least one first current zero point Q1 on the first radiator 10. The first current zero point Q1 is located at an end spaced apart from the feed point B.

[0082] The second end C is closer to the grounding point E than the first end A. In other words, along the extension direction of the first radiator 10, the first end A, the second end C, and the grounding point E are arranged sequentially. Taking the first end A being located near the third end D as an example, in other words, the first radiator 10 is almost entirely opposite the second radiator 20.

[0083] The feed point B is spaced apart from the second terminal C. The resonant current of the third resonant mode includes a fourth resonant current located on the first radiator 10 and a fifth resonant current located on the second radiator 20. The mode of the fourth resonant current is the 1 / 4 wavelength mode of the third frequency band. The fourth resonant current is the current from the feed point B to the second terminal C. Thus, the fourth resonant current forms a first current zero point Q1 at the second terminal C. The current zero point is the weakest point of the current and the point of the strongest electric field.

[0084] Please see Figure 9 The mode of the fifth resonant current is the 3 / 4 wavelength mode of the third frequency band. The second current zero point Q2 of the fifth resonant current on the second radiator 20 is directly opposite to the second terminal C. That is, the current zero point on the second radiator 20 is directly opposite to the current zero point on the first radiator 10 and is disconnected. The current zero point position is a basically no-current position, so the current distribution when the current zero points of the first radiator 10 and the second radiator 20 are disconnected can be equivalent to the current distribution when the current zero points of the first radiator 10 and the current zero points of the second radiator 20 are connected.

[0085] Please see Figure 9 The fifth resonant current includes a first sub-current flowing from the first terminal A to the second current zero point Q2 and a second sub-current flowing from the second terminal C to the second current zero point Q2. The mode of the first sub-current is the 1 / 4 wavelength mode of the third frequency band. The mode of the second sub-current is the 1 / 2 wavelength mode of the third frequency band. The current direction of the first sub-current is the same as that of the fourth resonant current. The direction of the first sub-current is opposite to that of the second sub-current. Due to the above design and the generated third resonant mode, the disconnection position between the first radiator 10 and the second radiator 20 is the current zero point. Therefore, it can be regarded as the second terminal C of the first radiator 10 being connected to the position of the second current zero point Q2 of the second radiator 20. The current intensity of the first sub-current changes with the intensity of the fourth resonant current. The current path of the first sub-current changes with the current path of the fourth resonant current. Specifically, the current direction, path, and intensity distribution of the first sub-current and the fourth resonant current change synchronously.

[0086] In one alternative implementation, please refer to Figure 9The feed point B is located at the first terminal A, and the first current zero point Q1 is located at the second terminal C. In the third resonant mode, the first radiator 10 generates a fourth resonant current under the excitation of the signal source 30. The current mode of the fourth resonant current is a 1 / 4 wavelength mode in the third frequency band. Thus, all paths of the first radiator 10 can be used to form the current in the 1 / 4 wavelength mode.

[0087] The length between the first terminal A and the second terminal C is approximately one-quarter of the wavelength of the third frequency band. The resonant current flows from the feed point B to the second terminal C. At this time, the second terminal C has zero current.

[0088] In the third resonant mode, the second radiator 20 generates a fifth resonant current under the excitation of the signal source 30. The fifth resonant current is a 3 / 4 wavelength mode in the third frequency band.

[0089] In this embodiment, the resonant current of the third resonant mode has at least one second current zero point Q2 on the second radiator 20. At least one first current zero point Q1 is directly opposite to the second current zero point Q2.

[0090] The second current zero point Q2 is the zero point of the fifth resonant current. The fifth resonant current includes a 1 / 4 wavelength mode current flowing from the third terminal D to the first boundary point H and a 1 / 2 wavelength current flowing from the fourth terminal F to the first boundary point H. The 1 / 4 wavelength mode current flowing from the third terminal D to the first boundary point H and the 1 / 2 wavelength current flowing from the fourth terminal F to the first boundary point H are in the same direction. The location of the first boundary point H is the second current zero point Q2. The position of the second current zero point Q2 is directly opposite the position of the first terminal A. When the position of the second terminal C moves, the position of the second current zero point Q2 moves accordingly, ensuring that the second current zero point Q2 is always directly opposite the first current zero point Q1 on the first radiator 10.

[0091] In the third resonant mode, although the first radiator 10 and the second radiator 20 are disconnected, the disconnection point between the first radiator 10 and the second radiator 20 is the current zero point. That is, the first current zero point Q1 position (second terminal C) on the first radiator 10 is disconnected from the second current zero point Q2 position (first boundary point H) on the second radiator 20. Since there is basically no current at the current zero point position and it is a point of strong electric field, it can be regarded as the second terminal C of the first radiator 10 being connected to the first boundary point H on the second radiator 20. Thus, the 3 / 4 wavelength mode of the third resonant mode can be equivalent to the 1 / 4 wavelength mode from the first terminal A to the second terminal C and the 1 / 2 wavelength mode from the first boundary point H to the fourth terminal F.

[0092] In other words, since the second end C of the first radiator 10, away from the feed point B, is disconnected from the second radiator 20, if the second end C of the first radiator 10, away from the feed point B, is a zero-current point, disconnecting at the zero-current point has virtually no effect on the current distribution. The current distribution effect is similar to the second end C of the first radiator 10 being connected to the opposite position on the second radiator 20.

[0093] In another embodiment, the feed point B is located between the first terminal A and the second terminal C. The electrical length of the current in the 1 / 4 wavelength mode on the first radiator 10 is shortened. At this time, the electrical length of the current in the 3 / 4 wavelength mode in the third resonant mode is shortened, and the center frequency of the third resonant mode shifts towards higher frequencies. As the position of the feed point B moves closer to the second terminal C, the center frequency of the third resonant mode shifts towards higher frequencies.

[0094] In another embodiment, the feed point B can be located at the second terminal C, with the feed point B spaced apart from the first terminal A. The fourth resonant current flows from the feed point B to the first terminal A. The fifth resonant current of the third resonant mode on the second radiator 20 flows from the fourth terminal F to the third terminal D, and is a 1 / 2 wavelength mode. Thus, the first terminal A is the first current zero point Q1, and the fourth terminal F is the second current zero point Q2. The first current zero point Q1 and the second current zero point Q2 of the first radiator 10 are directly opposite each other and disconnected, which can be equivalent to the locations where the first current zero point Q1 and the second current zero point Q2 are connected.

[0095] This application does not specifically limit the third frequency band. Optionally, the third frequency band may include, but is not limited to, at least one of the following: UHB band (greater than 3 GHz), Wi-Fi band, etc.

[0096] Furthermore, the third frequency band is greater than or equal to 3.5 GHz. When the third frequency band is greater than or equal to 3.5 GHz, the coupling gap between the first radiator 10 and the second radiator 20 is equivalent to a large capacitor, thus electrically connecting the first radiator 10 and the second radiator 20, so that the current on the first radiator 10 and the current on the portion of the second radiator 20 facing the first radiator 10 are in the same direction and have the same intensity. The current on the portion of the second radiator 20 facing the first radiator 10 also changes with the current on the first radiator 10. In this embodiment, the third frequency band is taken as the UHB band. In this way, the antenna assembly 100 can simultaneously cover the LB band + Wi-Fi-2.4G band / N41 band + UHB band.

[0097] In this embodiment, the third frequency band is high frequency. The inductor L is an open circuit for the third frequency band. Therefore, the fifth resonant current of the third resonant mode on the second radiator 20 does not pass through the inductor L to ground.

[0098] This application does not specifically limit the length of the first radiator 10. Optionally, the length of the first radiator 10 directly opposite the second radiator 20 is 1 / 3 to 1 / 4 of the total length of the second radiator 20, so as to excite a fourth resonant current in 1 / 4 wavelength mode on the first radiator 10 and a fifth resonant current in 3 / 4 wavelength mode on the second radiator 20.

[0099] Further, please refer to Figure 10 The first radiator 10 and the second radiator 20, under the excitation of the signal source 30, jointly form a fourth resonant mode supporting the fourth frequency band.

[0100] The resonant current of the fourth resonant mode on the second radiator 20 includes a sixth resonant current flowing from the third terminal D to the second boundary point J on the second radiator 20, and a seventh resonant current flowing from the fourth terminal F to the second boundary point J. Due to the periodicity of the current, the directions of the aforementioned currents can all be reversed.

[0101] This application does not specifically limit the location of the second boundary point J. Optionally, the second boundary point J may be located at the grounding point E, or may be set at an interval from the grounding point E.

[0102] This application does not specifically limit the fourth frequency band. Optionally, the fourth frequency band may include, but is not limited to, at least one of the UHB band (greater than 3GHz), Wi-Fi band, etc. In this embodiment, the fourth frequency band may be the Wi-Fi 5G band. Thus, the antenna assembly 100 can simultaneously cover the LB band + Wi-Fi-2.4G band / N41 band + UHB band + Wi-Fi 5G band.

[0103] In this embodiment, the fourth frequency band is a high frequency. Inductor L is an open circuit for the fourth frequency band. The seventh resonant current and the sixth resonant current in the fourth resonant mode also do not pass through inductor L to ground.

[0104] The sixth resonant current operates in a half-wavelength mode of the fourth frequency band. The seventh resonant current also operates in a half-wavelength mode of the fourth frequency band. The electrical length from the third terminal D to the fourth terminal F is approximately the full wavelength of the fourth frequency band.

[0105] The first radiator 10 is parallel to and opposite to the portion between the first terminal A and the grounding point E. The first radiator 10 generates an eighth resonant current in the fourth resonant mode. The mode of the eighth resonant current is a 1 / 4 wavelength mode of the fourth frequency band.

[0106] The first radiator 10 couples the third terminal D to form the sixth resonant current between the third terminal D and the grounding point E, and forms the seventh resonant current between the grounding point E and the fourth terminal F. The direction of the eighth resonant current is opposite to the direction of the sixth resonant current.

[0107] Furthermore, when the fourth frequency band is high frequency, the coupling gap between the first radiator 10 and the second radiator 20 is equivalent to a large capacitor. The first radiator 10 generates a strong eighth resonant current under the excitation of the signal source 30, and couples the part of the second radiator 20 near the third end D to generate a 1 / 2 wavelength mode. Then, the part of the second radiator 20 near the fourth end F generates an inverse 1 / 2 wavelength mode.

[0108] In other words, the fourth resonant mode is mainly a 1 / 4 wavelength mode from the first terminal A to the second terminal C, and a full wavelength mode from the third terminal D to the fourth terminal F.

[0109] Optional, please refer to Figure 4 The antenna assembly 100 also includes a matching circuit M1. The matching circuit M1 is electrically connected between the signal source 30 and the feed point B. The matching circuit M1 includes at least one of a capacitor and an inductor. The matching circuit M1 adjusts the impedance matching between the port of the signal source 30 and the port of the first radiator 10, so that the signal source 30 can excite a first resonant mode on the first radiator 10.

[0110] Specifically, the matching circuit M1 may include, but is not limited to, a capacitor, an inductor, a series connection of a capacitor and an inductor, a parallel connection of a capacitor and an inductor, a series connection of the above-mentioned components in parallel with a capacitor, a series connection of the above-mentioned components in parallel with an inductor, two series connections of the above-mentioned components in parallel, two parallel connections of the above-mentioned components in series, and so on.

[0111] Optional, please refer to Figure 11 The tuning circuit 40 further includes a switching unit K and multiple tuning branches T. One end of the inductor L is electrically connected to the grounding point E. The switching unit K is electrically connected to the end of the inductor L away from the grounding point. The other end of the switching unit K is optionally electrically connected to at least one of the multiple tuning branches T, and each tuning branch T is grounded. The tuning circuit 40 is used to switch sub-bands of the first frequency band. For example, the tuning circuit 40 is used to switch the antenna assembly 100 between sub-bands such as B5, B8, B20, and B28. Since the resonant current supporting the second resonant mode of the second frequency band does not pass through the tuning circuit 40 to ground, the second frequency band remains stationary when switching sub-bands of the first frequency band.

[0112] Of course, the tuning circuit 40 may not include inductors, but may include a switching unit K and multiple tuning branches T. Some or all of the multiple tuning branches T can compensate for the electrical length, thereby compensating for the reduction in the electrical length of the second radiator 20.

[0113] Furthermore, the resonant current supporting the third resonant mode of the third frequency band does not pass through the tuning circuit 40 to ground, so the third frequency band remains constant during sub-band switching of the first frequency band. Similarly, the resonant current supporting the fourth resonant mode of the fourth frequency band does not pass through the tuning circuit 40 to ground, so the fourth frequency band remains constant during sub-band switching of the first frequency band.

[0114] The tuning circuit 40 is an impedance-adjustable circuit, or an antenna switch circuit.

[0115] Optional, please refer to Figure 11 The fixed terminal of the switching unit K is electrically connected to the end of the inductor L furthest from the ground point E. Each tuning branch T has a different impedance, and one end of each tuning branch T is electrically connected to the selection terminal of the switching unit K. The other end of each tuning branch T is electrically connected to the reference ground. The switching unit K is a switching transistor, including but not limited to at least one of a triode, transistor, or field-effect transistor. The tuning branch T can be an inductor, capacitor, etc., with different impedance values. When the switching unit K switches to different tuning branches T, the tuning branches T have different impedances, i.e., different equivalent electrical lengths. This changes the electrical length of the current path, thereby switching the sub-band of the first frequency band supported by the first resonant mode. When the first frequency band is low frequency, low frequency switchability is achieved.

[0116] This application does not specify the exact location of the antenna assembly 100.

[0117] Please see Figure 12 The electronic device 1000 further includes a reference ground plane 50. The reference ground plane 50 is disposed within the frame 320. The reference ground plane 50 has a corner point corresponding to the corner of the frame 320. The distance between the location where the ground point E of the second radiator 20 is electrically connected to the reference ground plane 50 and the corner point of the reference ground plane 50 is less than 1 / 8 wavelength of the first frequency band.

[0118] The grounding point E of the second radiator 20 is electrically connected to the reference ground plane 50 at a location that is grounded back. Taking the first frequency band supported by the antenna assembly 100 as the LB band as an example, the distance between the grounding point E of the second radiator 20 electrically connected to the reference ground plane 50 and the corner point of the reference ground plane 50 is less than 1 / 8 of the wavelength corresponding to the LB band.

[0119] Since the grounding point E of the second radiator 20 is located near the corner of the reference ground 50, a ground current is formed on the reference ground 50 under the excitation of the signal source 30. The ground current flows from a distance to the grounding point E of the second radiator 20 and converges at the grounding point E of the second radiator 20, and then flows back to the second radiator 20 through the grounding point E. Because the antenna assembly 100 is grounded near the corner of the reference ground 50, when the reference ground 50 participates in radiation, a transverse current along the transverse side and a longitudinal current along the longitudinal side are generated on the reference ground 50. The flow direction of both the transverse and longitudinal currents is towards the corner point. Since the transverse and longitudinal currents intersect, or are even close to perpendicular, the mutual cancellation between the transverse and longitudinal currents is minimal.

[0120] If the grounding point E of the second radiator 20 is located far from the corner point along the longitudinal edge, a reverse current will be generated along the longitudinal edge. The far-field energy of this reverse current can cancel each other out, thereby reducing its radiation efficiency.

[0121] Specifically, the length of the lateral side is less than the length of the longitudinal side. When the antenna assembly 100 returns to ground at the corner point of the reference ground 50, the maximum angle between the ground currents on the reference ground 50 is approximately 90°. That is, the lateral current along the lateral side and the longitudinal current along the longitudinal side are the currents with the maximum angle, and no reverse current is generated, which improves the contribution efficiency of the reference ground 50 and thus improves the radiation efficiency of the antenna assembly 100.

[0122] Of course, in other embodiments, the antenna assembly 100 is located on the first side or the second side. That is, the grounding position of the antenna assembly 100 is located at a non-corner position, and the efficiency of the LB band can also be improved by generating the first resonant mode and the second resonant mode.

[0123] Please see Figure 13 The following example illustrates the following: the antenna assembly 100 is located at a non-edge position on the second side of the frame 320; the feed point B is located at the first end A of the first radiator 10; the first end A of the first radiator 10 is close to the third end D of the second radiator 20; the second end C of the first radiator 10 is close to the grounding point E of the second radiator 20; and the signal source 30 is electrically connected to the first end A through the matching circuit M1.

[0124] The first radiator 10 and the signal source 30 serve as excitation units, acting as spatial exciters for the T-shaped second radiator 20. The first radiator 10 and the second radiator 20 are staggered and coupled in a misaligned manner. The antenna assembly 100 provided in this embodiment differs from a traditional point-to-point antenna in that the first radiator 10 and the second radiator 20 are partially staggered and parallel to each other, allowing the first radiator 10 to better excite the second radiator 20 through spatial coupling, generating more resonant modes and achieving mode compensation. The excitation of the second radiator 20 occurs via the path: signal source 30 - matching circuit M1 - first radiator 10 - free space - second radiator 20. Excitation of the second radiator 20 is achieved spatially, meaning it is not directly fed by the inductor L via the signal source 30.

[0125] The antenna assembly 100 is excited to at least four resonant modes, which can simultaneously cover the LB+Wi-Fi 2.4G+UHB+Wi-Fi 5G frequency bands. Among them, the first resonant mode mainly includes the 1 / 4 wavelength mode from the third terminal D to the ground point E and the reverse 1 / 4 wavelength mode from the fourth terminal F to the ground point E, accompanied by a weak current from the first terminal A to the second terminal C.

[0126] The second resonant mode is mainly a half-wavelength mode from the third terminal D to the fourth terminal F, accompanied by a weak current from the first terminal A to the second terminal C.

[0127] After shortening the second radiator 20, an inductor L is placed at grounding point E to compensate for the electrical length of the second radiator 20. Under direct feed, the second resonant mode cannot be excited. However, in this embodiment, after changing the direct feed to capacitive feed, the second resonant mode, the third resonant mode, and the fourth resonant mode can be excited. Among them, the formation of the second resonant mode can improve the in-band efficiency of the first resonant mode and the second resonant mode.

[0128] The third resonant mode is primarily a three-quarter wavelength mode from terminal A to terminal C and from terminal D to terminal F. Since the first radiator 10 and the second radiator 20 are misaligned and relatively close (e.g., 1-2 mm), at higher frequencies (e.g., greater than 3.5 GHz), it can be considered as if a large capacitor has been added between the first radiator 10 and the second radiator 20. Therefore, the current from terminal A to terminal C and the current from terminal D to ground are the same current. In other words, simply put, the current in the third resonant mode is the three-quarter wavelength mode current from terminal A to terminal F.

[0129] The fourth resonant mode mainly consists of the quarter-wavelength mode current from the first terminal A to the second terminal C and the full-wavelength mode current from the third terminal D to the fourth terminal F. First, under the excitation of the signal source 30, a strong current in the quarter-wavelength mode is generated from the first terminal A to the second terminal C. This strong current in the quarter-wavelength mode excites a half-wavelength current to the left from the third terminal D to the fourth terminal F. Then, the half-wavelength current to the left generates a half-wavelength current distribution to the right.

[0130] As can be seen, in this embodiment, not only are the radiating and balanced modes of the T-shaped antenna excited, but also the new modes introduced by the change of boundary conditions due to the increase in frequency are excited, and a third resonant mode is also excited, namely the three-quarters mode from the first end A to the fourth end F.

[0131] If the first radiator 10 and the second radiator 20 are coupled at the ends to form a port-to-port antenna, then when the inductor L is grounded with a large inductance, the large inductance will make the overall impedance of the second radiator 20 too large, and the signal source 30 will not be able to excite the second radiator 20 with its excessive overall impedance.

[0132] In the antenna assembly 100 provided in this application embodiment, the misaligned coupling between the first radiator 10 and the second radiator 20 greatly increases the coupling amount, thus fully exciting the second radiator 20 to generate a first resonant mode and a second resonant mode. The resonant frequency (LB) of the first resonant mode and the resonant frequency (Wi-Fi 2.4G) of the second resonant mode are both located at a low sub-3G frequency position. At this time, the signal source 30 and the first radiator 10 mainly act as excitation sources to fully excite the mode currents of the first and second resonant modes on the second radiator 20. Since the first resonant mode current needs to be grounded through the inductor L, the first resonant mode can be frequency-adjusted by the inductor L on the second radiator 20 to compensate for the lack of electrical length of the shorter second radiator 20, covering LB, thus realizing the miniaturization of LB. Meanwhile, since the currents in the second, third, and third resonant modes do not go to ground from the inductor L, they have no effect on the current frequencies of the second, third, and third resonant modes. Furthermore, if the end of the inductor L that is far from the grounding point E is equipped with a tuning circuit 40, the frequency band switching of LB can also be achieved.

[0133] As the frequencies of the third and fourth resonant modes increase, the impedance between the two misaligned radiators is equivalent to a large capacitor at high frequencies (greater than or equal to 3.5 GHz). The first radiator 10 and the second radiator 20 are connected, so the first radiator 10 also acts as a radiating antenna. The first radiator 10 and the second radiator 20 together act as radiation sources to radiate outward, forming the third resonant mode, namely the three-quarters stub mode. Similarly, the first radiator 10 and the second radiator 20 form the fourth resonant mode, namely the one-wavelength stub mode.

[0134] Please see Figure 14 , Figure 14 These are the S-parameter curves and efficiency curves of the antenna assembly 100 provided in this application embodiment. Figure 14 Curve a is the S-parameter curve, curve b is the radiation efficiency curve, and curve c is the overall efficiency curve. As can be seen from curve a, antenna assembly 100 generates four resonant modes before 6 GHz. These resonant modes are: the first resonant mode with a resonant frequency at point 1 (0.75 GHz), the second resonant mode with a resonant frequency at point 2 (2.39 GHz), the third resonant mode with a resonant frequency at point 3 (4.3 GHz), and the fourth resonant mode with a resonant frequency at point 4 (5.8 GHz).

[0135] As can be seen from the overall efficiency curve, the efficiency of the LB band supported by the first resonant mode is -6.5dB, indicating that the miniaturized LB antenna in this application still has an efficiency comparable to that of a normal-length LB antenna.

[0136] Please see Figure 15 , Figure 15 This is a comparison of the S-parameter curves of the miniaturized LB antenna with misaligned coupling feed and the T-shaped direct-feed antenna provided in the embodiments of this application. Curve a is the S-parameter curve of the miniaturized LB antenna provided in the embodiments of this application. Curve b is the S-parameter curve of the T-shaped direct-feed antenna. Comparing curves a and b, it can be seen that the T-shaped direct-feed antenna cannot excite relatively high-frequency resonant modes.

[0137] Please see Figure 16 , Figure 16 This is a comparison chart of the efficiency curves of the miniaturized LB antenna with misaligned coupling feed and the T-shaped direct-feed antenna provided in the embodiments of this application. Curve a is the radiation efficiency curve of the miniaturized LB antenna with misaligned coupling feed provided in the embodiments of this application. Curve b is the radiation efficiency curve of the T-shaped direct-feed antenna. Curve c is the overall efficiency curve of the miniaturized LB antenna with misaligned coupling feed provided in the embodiments of this application. Curve d is the overall efficiency curve of the T-shaped direct-feed antenna.

[0138] Comparing curves a and b, it can be seen that the T-shaped direct-feed antenna cannot excite relatively high-frequency resonant modes. In the LB band, the radiation efficiency of the miniaturized LB antenna with staggered coupling provided in this application is comparable to that of the T-shaped direct-feed antenna.

[0139] Please see Figure 17 , Figure 17 These are the S-parameter curves of the antenna assembly 100 provided in this embodiment when the tuning circuit 40 switches the LB sub-band. Curves a, b, and c represent the S-parameters of the antenna assembly 100 when the tuning circuit 40 switches the LB sub-band from B28, B5, and B8, respectively. As can be seen from curves a, b, and c, when the LB sub-band switches from B28, B5, and B8, Wi-Fi 2.4G, UHB, and Wi-Fi 5G remain in a constant state. This is because the resonant currents of the second, third, and fourth resonant modes do not pass through the tuning circuit 40.

[0140] The antenna assembly 100 provided in this application embodiment can not only achieve miniaturization of the high-performance LB antenna on the side, but also, in order to compensate for the mode loss after miniaturization, it adopts misaligned spatial coupling to excite the missing half-wavelength and full-wavelength modes. Furthermore, due to the change in boundary conditions, an additional three-quarter wavelength mode is added, thereby achieving simultaneous coverage of LB+Wi-Fi 2.4G+UHB+Wi-Fi 5G frequency bands.

[0141] 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 the present application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application. These improvements and refinements are also considered to be within the scope of protection of this application.

Claims

1. An antenna assembly, characterized in that, include: The first radiator includes a first end, a feed point, and a second end; A signal source, electrically connected to the feed point, is used to provide an excitation signal; and A second radiator is arranged parallel to and opposite to the first radiator, and a coupling gap is formed between the second radiator and the first radiator. The second radiator includes a third end, a grounding point, and a fourth end arranged sequentially. At least one end of the first radiator is directly opposite the portion between the third end and the fourth end of the second radiator. A tuning circuit, one end of which is electrically connected to the grounding point and the other end of which is grounded, is used to increase the electrical length of the second radiator; The second radiator forms a first resonant mode supporting the first frequency band under the excitation of the signal source. The resonant current of the first resonant mode includes a first resonant current flowing from the third end to the grounding point and passing through the grounding point to the ground, and a second resonant current flowing from the fourth end to the grounding point and passing through the grounding point to the ground. The modes of the first resonant current and the second resonant current are both 1 / 4 wavelength modes of the first frequency band, and the length of the second radiator is (1 / 6-1 / 4) wavelength of the first frequency band.

2. The antenna assembly as claimed in claim 1, characterized in that, The second radiator also forms a second resonant mode supporting the second frequency band under the excitation of the signal source. The resonant current of the second resonant mode includes a third resonant current flowing from the third end to the fourth end. The mode of the third resonant current is the 1 / 2 wavelength mode of the second frequency band.

3. The antenna assembly as described in claim 1, characterized in that, The first radiator and the second radiator, under the excitation of the signal source, jointly form a third resonant mode supporting the third frequency band. The resonant current of the third resonant mode has at least one first current zero point on the first radiator, and the first current zero point is located at an end spaced apart from the feed point. The resonant current of the third resonant mode has at least one second current zero point on the second radiator, and at least one first current zero point is directly opposite the second current zero point.

4. The antenna assembly as described in claim 3, characterized in that, The second end is closer to the grounding point than the first end; the feed point is spaced apart from the second end; the resonant current of the third resonant mode includes a fifth current located on the first radiator and a fifth resonant current located on the second radiator, the mode of the fifth current is the 1 / 4 wavelength mode of the third frequency band, and the fifth current forms a first current zero point at the second end; The mode of the fifth resonant current is the 3 / 4 wavelength mode of the third frequency band, and the second current zero point of the fifth resonant current on the second radiator is directly opposite to the second terminal.

5. The antenna assembly as described in claim 4, characterized in that, The fifth resonant current includes a first sub-current flowing from the first end to the second current zero point and a second sub-current flowing from the second end to the second current zero point. The mode of the first sub-current is the 1 / 4 wavelength mode of the third frequency band, and the mode of the second sub-current is the 1 / 2 wavelength mode of the third frequency band. The current direction of the first sub-current is the same as the current direction of the fifth current. The current intensity of the first sub-current changes with the intensity of the fifth current, and the current path of the first sub-current changes with the current path of the fifth current.

6. The antenna assembly as claimed in claim 4, characterized in that, The power supply point is located at the first end.

7. The antenna assembly as claimed in claim 4, characterized in that, The length of the first radiator that is directly opposite the second radiator is 1 / 3 to 1 / 4 of the total length of the second radiator.

8. The antenna assembly as described in any one of claims 3-7, characterized in that, The third frequency band is greater than or equal to 3.5 GHz.

9. The antenna assembly as claimed in claim 1, characterized in that, The first radiator and the second radiator, under the excitation of the signal source, jointly form a fourth resonant mode supporting the fourth frequency band. The resonant current of the fourth resonant mode on the second radiator includes a sixth resonant current flowing from the third end to the boundary point on the second radiator and a seventh resonant current flowing from the fourth end to the boundary point. The mode of the sixth resonant current is the half-wavelength mode of the fourth frequency band, and the mode of the seventh resonant current is the half-wavelength mode of the fourth frequency band.

10. The antenna assembly as claimed in claim 9, characterized in that, The first radiator is parallel to and opposite to the portion between the first end and the grounding point. The first radiator forms an eighth resonant current in the fourth resonant mode. The mode of the eighth resonant current is a 1 / 4 wavelength mode of the fourth frequency band. The first radiator couples the third end and the grounding point to form a sixth resonant current, and forms a seventh resonant current between the grounding point and the fourth end. The direction of the eighth resonant current is opposite to the direction of the sixth resonant current.

11. The antenna assembly as described in any one of claims 1-7, 9, and 10, characterized in that, The orthographic projection of the second end in the target direction is located between the third end and the grounding point, and the orthographic projection of the first end in the target direction is located between the third end and the grounding point. Alternatively, the orthographic projection of the first end in the target direction is located on the side of the third end away from the grounding point, and the target direction is perpendicular to the extension direction of the second radiator.

12. The antenna assembly as claimed in claim 11, characterized in that, The length of the first radiator that is directly opposite the second radiator is greater than or equal to 1 / 2 of the total length of the first radiator.

13. The antenna assembly as described in any one of claims 1-7, 9, and 10, characterized in that, The first frequency band includes the LB frequency band.

14. The antenna assembly as claimed in claim 2, characterized in that, The tuning circuit includes an inductor, a switching unit, and multiple tuning branches. One end of the inductor is electrically connected to the grounding point, and the inductor is used to increase the electrical length of the second radiator. The switching unit is electrically connected to the end of the inductor away from the grounding point, and the other end of the switching unit can be selectively connected to at least one of the multiple tuning branches. Each tuning branch is grounded. The tuning circuit is also used to switch sub-bands of the first frequency band, and the second frequency band remains active when the sub-bands of the first frequency band are switched.

15. An electronic device, characterized in that, Includes the antenna assembly as described in any one of claims 1-14.

16. The electronic device as claimed in claim 15, characterized in that, The electronic device further includes a frame, which includes a top edge and a bottom edge disposed opposite to each other, and a first side edge and a second side edge connected between the top edge and the bottom edge, wherein the antenna assembly is disposed on the first side edge or the second side edge.

17. The electronic device as claimed in claim 15, characterized in that, The electronic device further includes a frame and a reference ground plane. The reference ground plane is disposed within the frame and has a corner point corresponding to the corner of the frame. The distance between the location where the ground point of the second radiator is electrically connected to the reference ground plane and the corner point of the reference ground plane is less than 1 / 8 wavelength of the first frequency band.

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