Antenna components and electronic equipment

Abstract

The present application provides an antenna assembly and electronic device, wherein a reference floor comprises a first side and a second side connected by a bend, with the connection between the first side and the second side forming a corner point; a first radiator is arranged along the second side, the first radiator comprising a feeding point and a first free end and a connecting end arranged opposite to each other, with the feeding point and the first free end spaced apart; one end of an electrical connector is electrically connected to the connecting end, and the other end of the electrical connector is electrically connected to the reference floor, with the distance between the electrical connector and the corner point being less than or equal to 1 / 16 wavelength of a first frequency band; a signal source is electrically connected to the feeding point, the signal source is used to excite the reference floor to form a floor current that converges on the electrical connector, and the signal source is also used to excite the first radiator to form at least a first resonant mode that supports the first frequency band, the resonant current of the first resonant mode on the first radiator flows from the connecting end to the first free end, and the first resonant mode is a 1 / 4 wavelength mode. The present application can improve antenna efficiency.

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 communication needs of electronic devices increase, these devices require more and more antennas. Improving antenna efficiency has become a technical problem that needs to be solved. Summary of the Invention

[0003] This application provides an antenna assembly for improving antenna efficiency and an electronic device having the antenna assembly.

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

[0005] The reference floor includes a first side and a second side that are bent and connected, with the connection between the first side and the second side forming a corner point;

[0006] A first radiator is disposed along the second side. The first radiator includes a feed point and a first free end and a connecting end disposed opposite to each other. The feed point and the first free end are spaced apart.

[0007] An electrical connector, one end of which is electrically connected to the connection terminal, and the other end of which is electrically connected to the reference ground, wherein the distance between the electrical connector and the corner point is less than or equal to 1 / 16 wavelength of the first frequency band; and

[0008] A signal source electrically connected to the feed point is used to excite the reference ground to form a ground current converging at the electrical connector. At least a portion of the ground current is distributed along the first side and the second side. The signal source is also used to excite at least one first resonant mode supporting the first frequency band to be formed on the first radiator. The resonant current of the first resonant mode on the first radiator flows from the connection end to the first free end. The first resonant mode is a 1 / 4 wavelength mode. The ground current is used to improve the radiation efficiency of the first frequency band.

[0009] Secondly, this application provides an electronic device including the aforementioned antenna assembly.

[0010] The antenna assembly and electronic device provided in this application are designed with a reference ground plane including a first side and a second side that are bent and connected, with a corner point formed at the connection between the first side and the second side; a first radiator including a feed point and a first free end and a connecting end disposed opposite to each other, with the feed point and the first free end spaced apart; one end of an electrical connector is electrically connected to the connecting end, and the other end of the electrical connector is electrically connected to the reference ground plane, with the distance between the electrical connector and the corner point being less than or equal to 1 / 16 wavelength of the first frequency band; a signal source is electrically connected to the feed point, and the signal source is used to excite the reference ground plane to form a ground current that converges at the electrical connector, at least a portion of the ground current being distributed along the first side and the second side, and the signal... The source is also used to excite at least one first resonant mode supporting the first frequency band to be formed on the first radiator. The resonant current of the first resonant mode on the first radiator flows from the connection end to the first free end. The first resonant mode is a 1 / 4 wavelength mode so that both the reference ground and the first radiator participate in energy radiation to support the first frequency band. The ground current is used to improve the radiation efficiency of the first frequency band. Since the radiation of the first frequency band involves the participation of the reference ground, and the current on the reference ground converges at an electrical connector at a distance less than 1 / 16 wavelength of the first frequency band from the corner point, there is less reverse current generated on the reference ground and less far-field energy cancellation, thus more effectively improving the radiation efficiency of the first frequency band. Attached Figure Description

[0011] 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.

[0012] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;

[0013] Figure 2 This is a partially exploded structural diagram of the electronic device provided in the embodiments of this application;

[0014] Figure 3 This is a schematic diagram of the structure of the first antenna assembly provided in the first embodiment of this application;

[0015] Figure 4 yes Figure 3 The provided current distribution diagram of the antenna assembly in the first resonant mode;

[0016] Figure 5 This is a schematic diagram of the structure of the second antenna assembly provided in the first embodiment of this application;

[0017] Figure 6 This is a schematic diagram of the structure of the third antenna assembly provided in the first embodiment of this application;

[0018] Figure 7 This is a schematic diagram of the structure of the fourth antenna assembly provided in the first embodiment of this application;

[0019] Figure 8 This is a schematic diagram of the structure of the fifth antenna assembly provided in the first embodiment of this application;

[0020] Figure 9 yes Figure 8 A schematic diagram of the matching circuit and the first tuning circuit in the diagram;

[0021] Figure 10 yes Figure 8 A schematic diagram of the structure of the first tuning circuit;

[0022] Figure 11 yes Figure 8 The provided diagrams show the S-parameters, radiation efficiency, and overall efficiency of the antenna assembly.

[0023] Figure 12 This is a schematic diagram of the antenna assembly provided in the second embodiment of this application;

[0024] Figure 13 yes Figure 12 The provided diagrams show the S-parameters, radiation efficiency, and overall efficiency of the antenna assembly.

[0025] Figure 14 yes Figure 8 The provided antenna assembly's S-parameters, radiation efficiency, and overall efficiency are consistent with... Figure 12 A comparison chart of the S-parameters, radiation efficiency, and overall efficiency of the provided antenna components;

[0026] Figure 15 This is a schematic diagram of the antenna assembly provided in the third embodiment of this application;

[0027] Figure 16 yes Figure 15 A current distribution diagram of the provided antenna assembly;

[0028] Figure 17 yes Figure 15 Another current distribution diagram of the provided antenna assembly;

[0029] Figure 18 yes Figure 16 A schematic diagram of the matching circuit and the second tuning circuit in the diagram;

[0030] Figure 19 yes Figure 16 A schematic diagram of the second tuning circuit in the middle;

[0031] Figure 20 yes Figure 15 The provided diagrams show the S-parameters, radiation efficiency, and overall efficiency of the antenna assembly.

[0032] Figure 21This is a schematic diagram of the antenna assembly provided in the fourth embodiment of this application;

[0033] Figure 22 yes Figure 21 A current distribution diagram of the provided antenna assembly;

[0034] Figure 23 yes Figure 21 Another current distribution diagram of the provided antenna assembly;

[0035] Figure 24 yes Figure 21 The provided diagrams show the S-parameters, radiation efficiency, and overall efficiency of the antenna assembly.

[0036] Figure 25 This is a schematic diagram of the antenna assembly provided in the fifth embodiment of this application;

[0037] Figure 26 yes Figure 25 A schematic diagram of the third tuning circuit in the middle;

[0038] Figure 27 yes Figure 25 A diagram showing the S-parameters, radiation efficiency, and overall efficiency of the provided antenna assembly;

[0039] Figure 28 yes Figure 25 Another S-parameter, radiation efficiency, and overall efficiency diagram of the provided antenna assembly;

[0040] Figure 29 This is a schematic diagram of the antenna assembly provided in the sixth embodiment of this application;

[0041] Figure 30 yes Figure 29 The provided diagrams show the S-parameters, radiation efficiency, and overall efficiency of the antenna assembly.

[0042] Figure 31 This is a schematic diagram of the antenna assembly provided in the seventh embodiment of this application;

[0043] Figure 32 This is a schematic diagram of the antenna assembly provided in the eighth embodiment of this application;

[0044] Figure 33 This is a schematic diagram of the antenna assembly provided in the ninth embodiment of this application.

[0045] Explanation of icon numbers:

[0046] Electronic device 1000; antenna assembly 100; display screen 200; middle frame 300; back cover 400; middle plate 310; frame 320; first radiator 10; reference ground 20; electrical connector 30; signal source 40; first side 21; second side 22; corner point 23; feed point A; first free end B; connection end C; matching circuit M; first tuning circuit M1; first inductor L1; fourth inductor L2; first switching unit K1; first tuning branch T1; second radiator 50; second free end D; second tuning circuit M2; second inductor L4; second switching unit K2; second tuning branch T2; third radiator 60; third free end E; first ground end F; first coupling gap 61; third tuning circuit M3; third switching unit K3; third tuning branch T3; fourth radiator 70; fourth free end F; second ground end G; fourth tuning circuit M4. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The term "connection" or "linkage" as used in this application can refer to adjacent direct "connection" or direct "linkage", or to inter-spaced indirect "connection" or indirect "linkage".

[0051] This application provides an antenna assembly and electronic device for improving antenna efficiency.

[0052] 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.

[0053] Please see Figure 2 The electronic device 1000 includes an antenna assembly 100. The antenna assembly 100 can improve antenna efficiency.

[0054] Please see Figure 2 Taking 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.

[0055] Please see Figure 3 The antenna assembly 100 includes a first radiator 10, a reference ground 20, an electrical connector 30, and a signal source 40.

[0056] This application does not limit the shape of the reference floor 20. Optionally, the reference floor 20 of this application may be a generally rectangular plate formed by the magnesium-aluminum alloy of the middle plate 310, the main plate, the sub-plate, etc. The reference floor 20 is located inside the frame 320 and has a similar size to the inner perimeter of the frame 320.

[0057] Please see Figure 3The reference floor 20 includes a first side 21 and a second side 22 that are bent and connected, and the connection between the first side 21 and the second side 22 forms a corner point 23. This is defined herein as the first corner point 23. The first side 21 and the second side 22 may be two perpendicular sides. This application is not limited to the first corner point 23 being the upper left corner, the upper right corner, the lower left corner, or the lower right corner.

[0058] 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.

[0059] 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 3 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.

[0060] 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 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 10 is taken as part of the metal frame 320 of the electronic device 1000.

[0061] Optionally, the first radiator 10 is disposed along the second side 22 or the first side 21. In this embodiment, the first radiator 10 is disposed along the second side 22. Further, the first radiator 10 may be parallel to or substantially parallel to the second side 22. In an optional implementation, the second side 22 is the longer side.

[0062] The first radiator 10 includes a feed point A and a first free end B and a connecting end C disposed opposite to each other. The first free end B and the connecting end C are the two opposite ends of the first radiator 10. The first free end B is disconnected from other structures. However, it is not limited to the first radiator 10 being disconnected from other structures. In other words, the connecting end C of the first radiator 10 can be integrated with other structures or disconnected.

[0063] The feed point A is spaced apart from the first free end B. This application does not specifically limit the location of the feed point A. Optionally, the feed point A may be located at the connection end C of the first radiator 10, or at the middle of the first radiator 10.

[0064] One end of the electrical connector 30 is electrically connected to the connection terminal C. The other end of the electrical connector 30 is electrically connected to the reference ground 20. This application does not specifically limit the electrical connector 30. Optionally, the electrical connector 30 may include, but is not limited to, other structural forms of electrical connection structures such as a grounding spring, a physical connection part integrally formed with the reference ground 20, etc.

[0065] The electrical connections described in this application include direct connections, indirect connections, inductive coupling, etc., which will not be elaborated further hereafter.

[0066] Optionally, the electrical connector 30 is disposed on or connected to the reference floor 20.

[0067] In this embodiment, the distance between the electrical connector 30 and the corner point 23 is less than or equal to 1 / 16 of the wavelength of the first frequency band. Optionally, the electrical connector 30 may be located at or near the first corner point 23 of the reference ground plane 20. In other words, the grounding location in the antenna assembly 100 provided in this embodiment is located at the corner of the reference ground plane 20.

[0068] The signal source 40 is electrically connected to the feed point A.

[0069] The signal source 40 includes, but is not limited to, radio frequency transceiver chips. The radio frequency signal (radio frequency current) transmitted by the signal source 40 is transmitted to the first radiator 10 and can excite the first radiator 10 to generate a resonant current, forming a resonant mode to support the frequency band corresponding to the resonant current.

[0070] In this embodiment of the application, the signal source 40 is located on the motherboard (see reference). Figure 2 The signal source 40 is electrically connected to the feed point A via methods including, but not limited to, direct soldering, or indirect methods such as coaxial cable, microstrip line, conductive spring, or conductive adhesive. Specifically, the signal source 40 is electrically connected to the feed point A via a feed spring (conductive spring) located on the motherboard.

[0071] The signal source 40 is used to excite the reference ground plane 20 to form a ground current converging at the electrical connector 30. At least a portion of the ground current is distributed along the first side 21 and the second side 22. The signal source 40 is also used to excite at least one first resonant mode supporting the first frequency band to be formed on the first radiator 10. The resonant current of the first resonant mode on the first radiator 10 flows from the connection end C to the first free end B. The first resonant mode is a 1 / 4 wavelength mode. The ground current is used to improve the radiation efficiency of the first frequency band. It should be noted that, due to the periodicity of the current flow direction, the resonant current can also flow from the first free end B to the feed point A. The first resonant mode is a 1 / 4 wavelength mode. The 1 / 4 wavelength mode is the fundamental mode of the monopole antenna and has relatively high efficiency, ensuring that the first frequency band supported by the first resonant mode has relatively high efficiency.

[0072] This application does not specifically limit the size of the first frequency band. Optionally, the first frequency band may include, but is not limited to, the LB band (less than or equal to 1 GHz), the MHB band (greater than 1 GHz and less than or equal to 3 GHz), or the UHB band (greater than 3 GHz). The first frequency band can be a 4G LTE (Long Term Evolution) band or a 5G NR band. Of course, the first frequency band can also be a GPS band, a Bluetooth band, or a Wi-Fi band, etc. The first frequency band can be determined according to actual needs. In this embodiment, the electronic device 1000 is a mobile phone, and the first frequency band is less than or equal to 2 GHz. In other embodiments, the electronic device 1000 can also be a smartwatch, etc., and the first frequency band can be the MHB band or the UHB band, etc.

[0073] In this embodiment, the reference ground plane 20 is a conductive structure and can be regarded as an antenna element with a certain width. Thus, the entire reference ground plane 20-antenna system is like a feed-biased dipole antenna. In other words, the reference ground plane 20 can act as a radiator, generating a current distribution under the excitation of the signal source 40, thereby improving the radiation efficiency of the first frequency band.

[0074] This application does not specify the dimensions of the reference floor 20. Optionally,

[0075] The electrical length corresponding to the resonant mode that supports the first frequency band is similar to the length of the lateral side of the reference ground plane 20, and close to half the length of the longitudinal side. Since the dimension of the lateral side of the reference ground plane 20 is close to the electrical length corresponding to the resonant mode that supports the first frequency band, the reference ground plane 20 can also participate in radiation under the excitation of the signal source 40. Therefore, the antenna form formed by the reference ground plane 20 and the first radiator 10 is similar to a dipole antenna. The radiator formed by the reference ground plane 20 is an irregular radiator.

[0076] Since the grounding point of the first radiator 10 is located near the corner of the reference ground 20, a ground current is formed on the reference ground 20 under the excitation of the signal source 40. This ground current flows from a position away from the electrical connector 30 to the electrical connector 30 and converges there. It then flows through the electrical connector 30 to the connection terminal C of the first radiator 10. The resonant current on the first radiator 10 flows from the connection terminal C to the first free terminal B. The above describes the current path formed on the reference ground 20 and the first radiator 10 under the excitation of the signal source 40.

[0077] Since the antenna assembly 100 is grounded near the first corner point 23 of the reference ground 20, when the reference ground 20 participates in radiation, a transverse current along the transverse side and a longitudinal current along the longitudinal side are generated on the reference ground 20. The direction of the transverse current and the longitudinal current is towards the first corner point 23. Since the transverse current and the longitudinal current intersect, or are even close to perpendicular, the mutual cancellation between the transverse current and the longitudinal current is minimal.

[0078] Specifically, taking the first side 21 as the horizontal side and the second side 22 as the vertical side as an example, where the length of the horizontal side is less than the length of the vertical side, the antenna assembly 100 returns to ground at the first corner point 23 of the reference ground 20. The maximum angle between the ground currents on the reference ground 20 is approximately 90°. That is, the horizontal current along the first side 21 and the vertical current along the second side 22 are the currents with the maximum angle, and no reverse current is generated, thus improving the contribution efficiency of the reference ground 20.

[0079] Further, please refer to Figure 4The lateral current flows from a position far from the antenna assembly 100 along the lateral edge to the position of the electrical connector 30, and the longitudinal current flows from a position far from the antenna assembly 100 along the longitudinal edge to the position of the electrical connector 30. If the electrical connector 30 is located far from the corner point 23 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. For example, if the electrical connector 30 is located in the middle of the longitudinal edge, then a larger portion of the pair of reverse currents along the longitudinal edge cancels each other out, resulting in a greater reduction in radiation efficiency. However, when the electrical connector 30 is located at the corner of the lateral and longitudinal edges, the pair of reverse currents form mutually perpendicular (or intersecting) currents, with less far-field energy cancellation, thus giving the first frequency band better radiation efficiency.

[0080] In this embodiment, the distance between the electrical connector 30 and the corner point 23 is designed to be less than or equal to 1 / 16 of the wavelength of the first frequency band. When the distance between the electrical connector 30 and the corner point 23 is greater than 1 / 16 of the wavelength of the first frequency band, the portion of reverse current formed along the lateral or longitudinal edge is relatively large. Thus, the portion of the reverse current canceling each other out is larger, resulting in lower radiation efficiency for the first frequency band. Conversely, when the distance between the electrical connector 30 and the corner point 23 is less than or equal to 1 / 16 of the wavelength of the first frequency band, the portion of reverse current pairs formed along the lateral or longitudinal edge is smaller, resulting in less impact on the efficiency of the first frequency band. Furthermore, the electrical connector 30 can be located at the corner point 23, further reducing or eliminating the portion of reverse current formed along the lateral or longitudinal edge, further minimizing the impact on the efficiency of the first frequency band.

[0081] In this embodiment, taking the electronic device 1000 as a mobile phone, the length of the first side 21 is 50-80mm, and the length of the second side 22 is approximately 140-160mm. The first frequency band is less than or equal to 2GHz. The distance between the electrical connector 30 and the corner point 23 is less than or equal to 10mm.

[0082] The antenna assembly 100 and electronic device 1000 provided in this application are designed with a reference ground 20 including a first side 21 and a second side 22 that are bent and connected, and a corner point 23 is formed at the connection between the first side 21 and the second side 22; the first radiator 10 includes a feed point A and a first free end B and a connection end C that are disposed opposite to each other, with the feed point A and the first free end B being spaced apart; one end of the electrical connector 30 is electrically connected to the connection end C, and the other end of the electrical connector 30 is electrically connected to the reference ground 20, and the distance between the electrical connector 30 and the corner point 23 is less than or equal to 1 / 16 of the wavelength of the first frequency band; the signal source 40 is electrically connected to the feed point A, and the signal source 40 is used to excite the reference ground 20 to form a ground current that converges on the electrical connector 30, at least a portion of the ground current is along the first side 21 and the second side 22. The second side 22 is distributed, and the signal source 40 is also used to excite at least one first resonant mode supporting the first frequency band to be formed on the first radiator 10. The resonant current of the first resonant mode on the first radiator 10 flows from the connection end C to the first free end B. The first resonant mode is a 1 / 4 wavelength mode so that both the reference ground 20 and the first radiator 10 participate in energy radiation to support the first frequency band. The ground current is used to improve the radiation efficiency of the first frequency band. Since the radiation of the first frequency band involves the participation of the reference ground 20, and the current on the reference ground 20 converges at the electrical connector 30 at a distance less than 1 / 16 wavelength of the first frequency band from the corner point, the reverse current generated on the reference ground 20 is less, the far-field energy cancellation is less, and the radiation efficiency of the first frequency band can be improved more effectively.

[0083] This application does not limit the shape or specific location of the first radiator 10. Optionally, the first radiator 10 can be linear, L-shaped, etc.

[0084] Optional, please refer to Figure 3 The first radiator 10 can be positioned along the second side 22, which is a longitudinal side. This allows the first radiator 10 to generate a relatively strong current along the second side 22. Since the longitudinal current contributes more energy to radiation, positioning the first radiator 10 along the second side 22 improves the radiation efficiency of the antenna assembly 100. Furthermore, positioning the first radiator 10 along the second side 22 generates a relatively strong mirror current, further strengthening the longitudinal pattern on the reference ground 20 and contributing more to the radiation output of the first radiator 10.

[0085] Alternatively, please refer to Figure 5 The first radiator 10 can also be set along the first side 21. The first side 21 is a horizontal side and is a short side. The first radiator 10 is set on the short side, which can utilize the space on the short side and avoid the side position when holding the electronic device 1000 in portrait mode, thus having better working efficiency when holding the device in portrait mode.

[0086] Alternatively, the first radiator 10 can also be L-shaped, with the first radiator 10 facing the corner of the reference floor 20. A part of the first radiator 10 faces the first side 21, and the other part of the first radiator 10 faces the second side 22. This can utilize the space at the corner and avoid the side position when holding the electronic device 1000 in portrait mode, thus improving work efficiency when holding the device in portrait mode.

[0087] This application does not limit the orientation of the first radiator 10. Optionally, the first free end B of the first radiator 10 may be located on the side of the connecting end C of the first radiator 10 away from the first corner point 23. In this way, the first radiator 10 can be arranged along the first side 21 or the second side 22 to excite a strong current at the edge of the corresponding reference floor 20. Of course, in other embodiments, the first free end B of the first radiator 10 may also be located on the side of the connecting end C of the first radiator 10 closer to the first corner point 23. In this way, the first free end B of the first radiator 10 may be located on the same side or a different side from the connecting end C of the first radiator 10.

[0088] This application does not specifically limit the antenna type of the antenna assembly 100. Optionally, the antenna type of the antenna assembly 100 may include, but is not limited to, the following embodiments.

[0089] In the first implementation, please refer to Figure 6 The feed point A is located at the connection terminal C. The feed point A is located at one end of the first radiator 10, and the other end of the first radiator 10 is a free end. Further, one end of the electrical connector 30 is electrically connected to the connection terminal C, and the other end of the electrical connector 30 is indirectly grounded. The electrical connector 30 can be electrically connected to the reference ground plane 20 through a resonant circuit. The resonant circuit can be part of the matching circuit M. Further, the resonant circuit includes, but is not limited to, an inductor. The electrical connector 30 is a conductive spring, which serves as both a feed spring and a ground spring. The antenna assembly 100 provided in this embodiment is a monopole antenna or an internal IFA antenna. The first resonant mode is a 1 / 4 wavelength mode, and the resonant current flows from the connection terminal C to the first free end B. The first resonant mode is the fundamental mode of the internal IFA antenna, thereby enabling the antenna assembly 100 to have better radiation efficiency in the first frequency band.

[0090] In this embodiment, taking the first radiator 10 as being set along the second side 22 (longitudinal side) as an example, the connecting end C of the first radiator 10 can be closer to the first corner point 23 relative to the first free end B.

[0091] In this embodiment, the power feed spring is placed near the corner of the reference ground 20 so as to excite a transverse current flowing along the transverse side to the electrical connector 30 and a longitudinal current flowing along the longitudinal side to the electrical connector 30 on the reference ground 20.

[0092] In this embodiment, the power supply spring and the grounding spring share a single spring, reducing the number of springs required and saving space. In this embodiment, the distance between the electrical connector 30 and the first corner point 23 is less than or equal to 1 / 16 of the wavelength of the first frequency band. This embodiment achieves a ground loop near the corner of the reference ground 20, facilitating the excitation of a lateral current flowing along the lateral edge to the electrical connector 30 and a longitudinal current flowing along the longitudinal edge to the electrical connector 30 on the reference ground 20.

[0093] In the second embodiment, the main difference from the first embodiment is that, please refer to [link / reference needed]. Figure 7 The feed point A is located between the connection end C and the first free end B. One end of the electrical connector 30 is electrically connected to the connection end C, and the other end of the electrical connector 30 is electrically connected to the reference ground plane 20. Further, the electrical connector 30 can be electrically connected to the reference ground plane 20 through a resonant circuit. Further, the resonant circuit includes, but is not limited to, an inductor. The electrical connector 30 is a grounding spring or an integrally formed physical connection part. The antenna assembly 100 provided in this embodiment is an external IFA antenna. The first resonant mode is a 1 / 4 wavelength mode, and the resonant current flows from the connection end C to the first free end B. The first resonant mode is the ground mode of the internal IFA antenna, thereby enabling the antenna assembly 100 to have better radiation efficiency in the first frequency band. This embodiment achieves grounding near the corner of the reference ground plane 20, so as to excite the formation of a lateral current flowing along the lateral edge to the electrical connector 30 and a longitudinal current flowing along the longitudinal edge to the electrical connector 30 on the reference ground plane 20.

[0094] The antenna assembly 100 of the above type reduces the formation of reverse current pairs by designing the position of the electrical connector 30 close to or located at the corner point 23 of the reference ground 20, thereby reducing the far-field energy cancellation of the reverse current and improving the radiation efficiency of the antenna assembly 100.

[0095] In this embodiment, please refer to Figures 3-7 The antenna assembly 100 also includes a matching circuit M, which is electrically connected between the feed point A and the signal source 40. The matching circuit M is used to adjust the impedance matching between the port of the signal source 40 and the port of the first radiator 10, so that a first resonant mode supporting the first frequency band is formed on the first radiator 10.

[0096] The matching circuit M can be installed on the sub-board, and one end of the matching circuit M is electrically connected to the first feed point A through a feed spring.

[0097] This application does not impose specific limitations on the structure of the matching circuit M. Optionally, the matching circuit M includes at least one of an inductor and a capacitor.

[0098] In this embodiment, the length of the first radiator 10 is not specifically limited. Optionally, the length of the first radiator 10 can be close to 1 / 4 wavelength of the first frequency band, laying the foundation for the signal source 40 to excite the first radiator 10 to form a first resonant mode.

[0099] As the communication demands of electronic devices 1000 increase, more and more antennas need to be installed on them. These antennas occupy considerable space, especially low-frequency antennas, which are relatively large and take up a significant amount of space. Taking a mobile phone as an example, a single low-frequency antenna occupies the entire lower right corner of the device. To further improve the effective connection of low-frequency signals, multiple low-frequency antennas are used on the device, such as four. Due to the low frequency of these antennas, each low-frequency antenna requires an average stub length of 40-50mm in the overall stack, occupying a considerable amount of space. If the length of the low-frequency antenna is shortened, the antenna radiation efficiency will decrease rapidly.

[0100] The following embodiments of this application will specifically describe the structure of the antenna assembly 100 that achieves miniaturization while ensuring antenna radiation efficiency.

[0101] Optionally, the length of the first radiator 10 is less than 1 / 4 wavelength of the first frequency band.

[0102] Please see Figure 8 , Figure 8 This is a schematic diagram of the antenna assembly 100 provided in the first embodiment of this application. The antenna assembly 100 further includes a first tuning circuit M1. One end of the first tuning circuit M1 is electrically connected to the other end of the electrical connector 30, and the other end of the first tuning circuit M1 is electrically connected to the reference ground plane 20. The first tuning circuit M1 is used to compensate for the electrical length of the first radiator 10. The resonant current of the first resonant mode can flow through the reference ground plane 20 and the first tuning circuit M1 to the first radiator 10. The first tuning circuit M1 is used to increase the current path of the resonant current of the first resonant mode, compensate for the electrical length of the first radiator 10, and make the electrical length of the first radiator 10 and the first tuning circuit M1 close to 1 / 4 wavelength of the first frequency band, thereby providing the electrical length condition for the first radiator 10 to generate the first resonant mode.

[0103] In this embodiment, by placing the grounding position of the antenna assembly 100 (the position of the electrical connector 30) near the corner of the reference ground plane 20, the reference ground plane 20 can be excited to generate lateral and longitudinal currents, which participate in energy radiation, thereby improving the efficiency of the first frequency band. On the other hand, the lateral and longitudinal currents have less energy cancellation in the far field, thus also improving the efficiency of the first frequency band. Although shortening the length of the first radiator 10 will lead to a decrease in the efficiency of the first resonant mode, since the aforementioned design of this embodiment has already improved the efficiency of the first resonant mode to a good level, even if the efficiency of the first radiator 10 decreases due to the shortening of its length, it can still meet the usage standards. Therefore, this embodiment appropriately shortens the length of the first radiator 10 based on the above, while ensuring the generation of the first resonant mode and having relatively good efficiency, reducing the space occupied by the antenna assembly 100, and realizing the miniaturization of the antenna assembly 100.

[0104] Furthermore, the length of the first radiator 10 is greater than or equal to 1 / 5 of the 1 / 4 wavelength corresponding to the first frequency band. In this embodiment, the length of the first radiator 10 can be shortened to 1 / 2 of the 1 / 4 wavelength corresponding to the first frequency band. In other words, the length of the first radiator 10 can be shortened to half of its original size. Taking a low frequency as an example, without shortening the length of the first radiator 10, the length of the first radiator 10 is approximately 50 mm. In this embodiment, the length of the first radiator 10 can be approximately 25 mm, which, while generating the first resonant mode, enables the first resonant mode to have relatively good radiation efficiency and achieves miniaturization of the antenna assembly 100. Taking a low frequency as another example, without shortening the length of the first radiator 10, the length of the first radiator 10 is approximately 40-50 mm. In this embodiment, the length of the first radiator 10 can be approximately 10 mm, which, while generating the first resonant mode, enables the first resonant mode to have relatively good radiation efficiency and further achieves miniaturization of the antenna assembly 100.

[0105] Optional, please refer to Figure 9 The first tuning circuit M1 includes a first inductor L1. One end of the first inductor L1 is electrically connected to the other end of the electrical connector 30, and the other end of the first inductor L1 is grounded. Thus, the resonant current of the first resonant mode can be grounded through the first radiator 10 and the first inductor L1. The sum of the equivalent electrical length of the first inductor L1 and the electrical length of the first radiator 10 is close to 1 / 4 wavelength of the first frequency band, giving the antenna assembly 100 the electrical length conditions necessary to generate the first resonant mode.

[0106] Please see Figure 9The matching circuit M includes a fourth inductor L2, one end of which is electrically connected to the signal source 40, and the other end is electrically connected to the feed point A via an electrical connector 30 (feed spring). The first tuning circuit M1 includes a first inductor L1, one end of which is electrically connected to the other end of the electrical connector 30, and the other end of which is grounded. In this embodiment, the ground return path on the first radiator 10 is from the first radiator 10 through the first inductor L1 to ground. The first inductor L1 compensates for the reduction in electrical length due to the shortening of the length of the first radiator 10.

[0107] It should be noted that even though the first inductor L1 can compensate for the reduction in electrical length caused by the shortening of the first radiator 10, the effect of the inductor on the resonant current is not as significant as the radiation contribution of the radiating branch. Therefore, if the antenna assembly 100 is not positioned near the corner of the aforementioned reference ground 20, the efficiency of the first resonant mode will decrease. However, by positioning the antenna assembly 100 near the corner of the aforementioned reference ground 20, as described in this application, the efficiency reduction caused by the first resonant mode formed by the first inductor L1 and the first radiator 10 can be effectively compensated, achieving miniaturization of the antenna assembly 100 while also improving the efficiency of the first resonant mode.

[0108] Furthermore, the first tuning circuit M1 is an impedance-adjustable circuit, or an antenna switching circuit.

[0109] Optional, please refer to Figure 10 The first tuning circuit M1 includes a first switching unit K1 and multiple first tuning branches T1. The fixed terminal of the first switching unit K1 is electrically connected to the other end of the electrical connector 30. Each first tuning branch T1 has a different impedance, and one end of each first tuning branch T1 is electrically connected to the selection terminal of the first switching unit K1. The other end of each first tuning branch T1 is electrically connected to the reference ground plane 20. The first switching unit K1 is a switching transistor, including but not limited to at least one of a triode, transistor, or field-effect transistor. The first tuning branches T1 can be inductors with different inductance values. When the first switching unit K1 switches to different first tuning branches T1, the first tuning branches T1 have different impedances, i.e., different equivalent electrical lengths. This changes the electrical length of the current path, thereby changing the magnitude of the first frequency band supported by the first resonant mode. When the first frequency band is low frequency, low-frequency adjustability is achieved.

[0110] Please see Figure 8 Taking the antenna assembly 100 as a monopole antenna as an example, the monopole antenna is located on the right long side of the electronic device 1000 and near the bottom edge. The length of the first radiator 10 of the antenna assembly 100 is approximately 23 mm, which is about half the normal required size of the radiator of an LB antenna.

[0111] In this embodiment, the grounding position of the antenna assembly 100 (the electrical connector 30 connected to the first inductor L1 is the grounding position) is located at a corner. This not only ensures that the resonant current in the LB low-frequency band is excited on the first radiator 10, but also ensures that a considerable portion of the energy of the antenna assembly 100 during low-frequency radiation comes from the radiation contribution of the reference ground plane 20 (e.g., a PCB board). The width of the short side (first side 21) of the reference ground plane 20 (e.g., a PCB board) is close to the length required for the LB low-frequency band, thus allowing it to replace more of the shortened first radiator 10 and excite the resonant current in the LB band. Furthermore, the strong current at the grounding position is distributed on the reference ground plane 20 (e.g., a PCB board) as follows... Figure 8 As shown, there is essentially no reverse current. The angle formed by the current on the reference ground 20 (e.g., a PCB board) is a maximum of 90 degrees, and the angle between the currents in other parts is even less than 90 degrees. The current on the reference ground 20 does not cancel out in the far-field energy. However, at other locations except corners, reverse current is generated on the reference ground 20 (e.g., a PCB board), and the current on the reference ground 20 cancels out in the far-field energy. Therefore, grounding the antenna assembly 100 at the corner can significantly improve efficiency.

[0112] Please see Figure 11 , Figure 11 These are the S-parameters, radiation efficiency, and overall efficiency curves of the antenna assembly 100 provided in the first embodiment of this application. The length of the first radiator 10 of the antenna assembly 100 (low-frequency antenna) is 23 mm, approximately half the length of the radiator of a normal low-frequency antenna. The operating mode of the antenna assembly 100 (low-frequency antenna) is 1 / 4 wavelength mode. Curve a is the S-parameter curve of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the overall efficiency curve of the antenna assembly 100. Taking the first frequency band as N28 as an example, in this embodiment, the antenna assembly 100 uses a corner grounding method, such as... Figure 11 As shown by curve c, the efficiency of the N28 band can reach within -5dB, which is much higher than the efficiency of low-frequency antennas, which is generally around -10dB to -7dB. This indicates that the antenna assembly 100 provided in this embodiment still has good efficiency even when the length of the radiating stub is shortened to half of its original length.

[0113] Please see Figure 12 , Figure 12This is a schematic diagram of the antenna assembly 100 provided in the second embodiment of this application. The difference between this embodiment and the first embodiment is that the length of the first radiator 10 is further shortened. Specifically, the length of the first radiator 10 of the antenna assembly 100 is approximately 10 mm, which is about one-fifth to one-quarter of the normal required size of the radiator of an LB antenna. Furthermore, the value of the first inductor L1 in this embodiment is greater than that in the first embodiment, because the first inductor L1 in this embodiment needs to compensate for the increased electrical length caused by the shortened length of the first radiator 10. The position of the electrical connector 30 electrically connected to the first inductor L1 in this embodiment is the same as that in the first embodiment.

[0114] Please see Figure 13 , Figure 13 These are the S-parameters, radiation efficiency, and overall efficiency curves of the antenna assembly 100 provided in the second embodiment of this application. The length of the first radiator 10 of the antenna assembly 100 (low-frequency antenna) is 10mm, which is 1 / 4 to 1 / 5 of the radiator length of a normal low-frequency antenna. The operating mode of the antenna assembly 100 (low-frequency antenna) is 1 / 4 wavelength mode. Curve a is the S-parameter curve of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the overall efficiency curve of the antenna assembly 100. Taking the first frequency band as N28 as an example, in this embodiment, the antenna assembly 100 uses a corner grounding method, such as... Figure 13 As shown by curve c, even with a relatively short first radiator 10, the antenna assembly 100 can still cover the N28 frequency band, and the peak efficiency remains high. This demonstrates that the antenna assembly 100 provided in this embodiment still maintains good efficiency even when the length of the radiating stub is shortened to 1 / 4-1 / 5 of its original length.

[0115] Please see Figure 14 , Figure 14 These are comparison curves showing the S-parameters, radiation efficiency, and overall efficiency of the antenna assembly 100 provided in the first embodiment of this application, and the S-parameters, radiation efficiency, and overall efficiency of the antenna assembly 100 provided in the second embodiment. Curve a1 is the S-parameter curve of the antenna assembly 100 in the first embodiment. Curve b1 is the radiation efficiency curve of the antenna assembly 100 in the first embodiment. Curve c1 is the overall efficiency curve of the antenna assembly 100 in the first embodiment. Curve a2 is the S-parameter curve of the antenna assembly 100 in the second embodiment. Curve b2 is the radiation efficiency curve of the antenna assembly 100 in the second embodiment. Curve c2 is the overall efficiency curve of the antenna assembly 100 in the second embodiment.

[0116] As shown in the figure, the antenna assembly 100 provided in the first embodiment and the antenna assembly 100 provided in the second embodiment have similar efficiencies. The difference lies in the fact that the antenna assembly 100 provided in the first embodiment has an in-band efficiency of -4.6dB in the N28 frequency band, while the antenna assembly 100 provided in the second embodiment has an in-band efficiency of -6.2dB in the N28 frequency band. It can be seen from the in-band average efficiency that the shorter the first radiator 10 is, the lower the in-band average efficiency will be. However, even if the length of the first radiator 10 is 10mm, the efficiency of the antenna assembly 100 provided in the second embodiment is still higher than the performance of low-frequency antennas in other positions (efficiency -10dB to -7dB).

[0117] This application provides further examples illustrating the specific structure of the antenna assembly 100.

[0118] Please see Figure 15 , Figure 15 This is a schematic diagram of the antenna assembly 100 provided in the third embodiment of this application. The antenna assembly 100 further includes a second radiator 50 disposed along the first side 21. One end of the second radiator 50 is connected to the connection end C, and the other end of the second radiator 50 is a second free end D. The feed point A is located at the connection end C. The antenna type of the antenna assembly 100 provided in this embodiment is a T-type antenna. This application does not specifically limit the position of the second radiator 50. Optionally, both the second radiator 50 and the first radiator 10 are disposed along the second side 22. Alternatively, the first radiator 10 is disposed along the second side 22, and the second radiator 50 is disposed along the first side 21.

[0119] The signal source 40 excites the first resonant mode formed on the first radiator 10 to also excite a resonant current on the second radiator 50. The current intensity of the resonant current of the first resonant mode on the first radiator 10 is greater than the current intensity of the resonant current of the first resonant mode on the second radiator 50. The current direction of the resonant current of the first resonant mode on the first radiator 10 is opposite to the current direction of the resonant current of the first resonant mode on the second radiator 50.

[0120] Signal source 40 excites first radiator 10 and second radiator 50 to generate mode 1 and mode 2. Mode 1 is a quarter-wavelength mode (first resonant mode) of the main branch (first radiator 10), accompanied by a reverse current (current of the first sub-resonant mode) on the parasitic branch (second radiator 50).

[0121] For details, please refer to Figure 16The current distribution in Mode 1 consists of a strong current flowing from feed point A to the first free end B on the main stub, and a weaker current flowing from feed point A to the second free end D. The resonant modes on the main stub contribute significantly to the efficiency of Mode 1, and the frequency band supported by these resonant modes determines the effective frequency band of Mode 1. In other words, Mode 1 supports the first frequency band.

[0122] The signal source 40 also forms a second resonant mode supporting the second frequency band on the first radiator 10 and the second radiator 50. The current intensity of the second resonant mode on the second radiator 50 is greater than the current intensity of the second resonant mode on the first radiator 10. The current direction of the second resonant mode on the second radiator 50 is the same as the current direction of the second resonant mode on the first radiator 10. The second resonant mode is a half-wavelength mode of the second frequency band.

[0123] This application does not specify a particular size for the second frequency band. Optionally, the second frequency band may include, but is not limited to, an LB band (less than or equal to 1 GHz), an MHB band (greater than 1 GHz and less than or equal to 3 GHz), or a UHB band (greater than 3 GHz). The second frequency band can be a 4G LTE (Long Term Evolution) band or a 5G NR band. Of course, the second frequency band can also be a GPS band, a Bluetooth band, or a Wi-Fi band, etc. The second frequency band can be determined according to actual needs.

[0124] Specifically, mode 2 is the half-wavelength mode of the entire branch of the parasitic branch (second radiator 50).

[0125] For details, please refer to Figure 17 The current distribution in Mode 2 is a resonant current flowing from the first free end B to the second free end D. The current intensity of this resonant current on the first radiator 10 is less than the current intensity of the resonant current on the second radiator 50. The resonant modes on the parasitic stubs contribute significantly to the efficiency of Mode 2, and the frequency band supported by these modes determines the effective frequency band of Mode 2. In other words, Mode 2 supports the second frequency band. The electrical length of the second radiator 50 is approximately one-quarter of the wavelength of the second frequency band.

[0126] Mode 1 is also called the high-mode radiating mode. Mode 2 is also called the high-mode balanced mode. Generally, after the antenna assembly 100 generates the high-mode radiating mode and the high-mode balanced mode, the efficiency will be significantly improved, thereby increasing the radiation efficiency (wave boost) within the antenna band.

[0127] When the first frequency band is close to the second frequency band, the frequency band supported by the main radiating branch and the frequency band supported by the parasitic branch form a continuous frequency band with good bandwidth.

[0128] In this embodiment, the length of the second radiator 50 is not specifically limited. Optionally, the length of the second radiator 50 can be close to 1 / 4 wavelength of the second frequency band, laying the foundation for the signal source 40 to excite the second radiator 50 to form a second resonant mode.

[0129] Alternatively, the length of the second radiator 50 may be less than 1 / 4 wavelength of the second frequency band.

[0130] Please see Figure 18 The antenna assembly 100 further includes a second tuning circuit M2. One end of the second tuning circuit M2 is electrically connected to the other end of the electrical connector 30, and the other end is electrically connected to the reference ground plane 20. The resonant current of the second resonant mode can flow through the reference ground plane 20 and the second tuning circuit M2 to the second radiator 50. The second tuning circuit M2 is used to increase the current path of the resonant current of the second resonant mode, compensate for the electrical length of the second radiator 50, and make the electrical length of the second radiator 50 and the second tuning circuit M2 close to 1 / 4 wavelength of the second frequency band, thereby providing the electrical length condition for the second radiator 50 to generate the second resonant mode.

[0131] In this embodiment, by placing the grounding position of the antenna assembly 100 (the position of the electrical connector 30) near the corner of the reference ground plane 20, the reference ground plane 20 can be excited to generate lateral and longitudinal currents, which participate in energy radiation, thereby improving the efficiency of the second frequency band. On the other hand, the lateral and longitudinal currents have less energy cancellation in the far field, thus also improving the efficiency of the second frequency band. Although shortening the length of the second radiator 50 will lead to a decrease in the efficiency of the second resonant mode, since the aforementioned design of this embodiment has already improved the efficiency of the second resonant mode to a good level, even if the efficiency of the second radiator 50 is reduced due to the shortening of its length, it can still meet the usage standards. Therefore, this embodiment appropriately shortens the length of the second radiator 50 based on the above, while ensuring the generation of the second resonant mode and having relatively good efficiency, reducing the space occupied by the antenna assembly 100, and realizing the miniaturization of the antenna assembly 100.

[0132] Furthermore, the length of the second radiator 50 is greater than or equal to 1 / 5 of the 1 / 4 wavelength corresponding to the second frequency band. In this embodiment, the length of the second radiator 50 can be shortened to 1 / 2 of the 1 / 4 wavelength corresponding to the second frequency band. In other words, the length of the second radiator 50 can be shortened to half of its original size. Taking a low frequency as an example, without shortening the length of the second radiator 50, the length of the second radiator 50 is approximately 50 mm. In this embodiment, the length of the second radiator 50 can be approximately 25 mm, which, while generating the second resonant mode, enables the second resonant mode to have relatively good radiation efficiency and achieves miniaturization of the antenna assembly 100. Taking a low frequency as another example, without shortening the length of the second radiator 50, the length of the second radiator 50 is approximately 40-50 mm. In this embodiment, the length of the second radiator 50 can be approximately 10 mm, which, while generating the second resonant mode, enables the second resonant mode to have relatively good radiation efficiency and further achieves miniaturization of the antenna assembly 100.

[0133] Optional, please refer to Figure 18 The second tuning circuit M2 includes a second inductor L4. One end of the second inductor L4 is electrically connected to the other end of the electrical connector 30, and the other end of the second inductor L4 is grounded. Thus, the resonant current of the second resonant mode can be grounded from the second radiator 50 and the second inductor L4. The sum of the equivalent electrical length of the second inductor L4 and the electrical length of the second radiator 50 is close to 1 / 4 wavelength of the second frequency band, giving the antenna assembly 100 the electrical length conditions for generating the second resonant mode.

[0134] It should be noted that even though the second inductor L4 can compensate for the reduction in electrical length caused by the shortening of the second radiator 50, the effect of the inductor on the resonant current is less than the radiation contribution of the radiating branch. Therefore, if the antenna assembly 100 is not placed near the corner of the aforementioned reference ground 20, the efficiency of the second resonant mode will decrease. However, by placing the antenna assembly 100 near the corner of the aforementioned reference ground 20, the efficiency reduction caused by the second resonant mode formed by the second inductor L4 and the second radiator 50 can be effectively compensated, thereby achieving miniaturization of the antenna assembly 100 while improving the efficiency of the second resonant mode.

[0135] Furthermore, the second tuning circuit M2 is an impedance-adjustable circuit, or an antenna switching circuit.

[0136] Optional, please refer to Figure 19The second tuning circuit M2 includes a second switching unit K2 and multiple second tuning branches T2. The fixed terminal of the second switching unit K2 is electrically connected to the other end of the electrical connector 30. Each second tuning branch T2 has a different impedance, and one end of each second tuning branch T2 is electrically connected to the selection terminal of the second switching unit K2. The other end of each second tuning branch T2 is electrically connected to the reference ground plane 20. The second switching unit K2 is a switching transistor, including but not limited to at least one of a triode, transistor, or field-effect transistor. The second tuning branches T2 can be inductors with different inductance values. When the second switching unit K2 switches to different second tuning branches T2, the second tuning branches T2 have different impedances, i.e., different equivalent electrical lengths. This changes the electrical length of the current path, thereby changing the magnitude of the second frequency band supported by the second resonant mode. When the second frequency band is low frequency, low-frequency adjustment is achieved.

[0137] In this embodiment, the lengths of the first radiator 10 and the second radiator 50 are not specifically limited. Optionally, the length of the first radiator 10 is approximately one-quarter of the wavelength of the first frequency band, and the length of the second radiator 50 is approximately one-quarter of the wavelength of the second frequency band.

[0138] Alternatively, the length of the first radiator 10 is less than 1 / 4 wavelength of the first frequency band, and the length of the second radiator 50 is close to 1 / 4 wavelength of the second frequency band. The first inductor L1 is used to compensate for the reduction in the length of the first radiator 10.

[0139] Alternatively, the length of the first radiator 10 is approximately one-quarter of the wavelength of the first frequency band, and the length of the second radiator 50 is less than one-quarter of the wavelength of the second frequency band. The second inductor L4 is used to compensate for the reduction in the length of the second radiator 50.

[0140] Alternatively, the length of the first radiator 10 is less than 1 / 4 wavelength of the first frequency band, and the length of the second radiator 50 is less than 1 / 4 wavelength of the second frequency band. For example, if both the first radiator 10 and the second radiator 50 are shortened to half their original length, the size of the antenna assembly 100 is reduced by 40-50 mm.

[0141] Optionally, the first inductor L1 and the second inductor L4 are the same inductor, which is used to compensate for the reduction in the length of the first radiator 10 and the second radiator 50. In this way, this application can reduce the size of the first radiator 10 and the second radiator 50 while ensuring good efficiency in both the first and second frequency bands, further miniaturizing the antenna and reducing the number of components.

[0142] Of course, in other embodiments, the first inductor L1 and the second inductor L4 can coexist. Alternatively, the first tuning circuit M1 and the second tuning circuit M2 can coexist, and a filtering circuit can be used to filter the first frequency band and the second frequency band, so that the current of the first frequency band is grounded through the first tuning circuit M1, and the current of the second frequency band is grounded through the second tuning circuit M2. In this way, the magnitudes of the first frequency band and the second frequency band can be tuned independently.

[0143] This application does not specify the positions of the first radiator 10 and the second radiator 50.

[0144] Optionally, the distance between the feed point A and the corner point 23 is less than the distance between the first free end B and the corner point 23. That is, the first free end B is farther away from the corner point 23 relative to the feed point A. Of course, in other embodiments, the first free end B may also be located on the side of the feed point A facing the corner point 23.

[0145] In this embodiment, the branch length of the second radiator 50 is less than the branch length of the first radiator 10, so the first radiator 10 can be defined as the main branch and the second radiator 50 as the parasitic branch. Alternatively, the branch length of the second radiator 50 can also be less than the branch length of the first radiator 10, so the second radiator 50 can be defined as the main branch and the first radiator 10 as the parasitic branch.

[0146] Optionally, the length of the first side 21 is less than the length of the second side 22. At least a portion of the first radiator 10 is disposed along the second side 22, and at least a portion of the second radiator 50 is disposed along the first side 21. That is, the main branch is disposed on the side where the longitudinal side is located, and the parasitic branch is disposed on the side where the transverse side is located. In this way, the main branch can excite more longitudinal current, thereby improving radiation efficiency. Of course, in other embodiments, the main branch can also be disposed on the side where the transverse side is located, and the parasitic branch can also be disposed on the side where the longitudinal side is located, so as to effectively avoid the influence of the first resonant mode generated by the main branch when the screen is held vertically.

[0147] Alternatively, both the second radiator 50 and the first radiator 10 are disposed along either the first side 21 or the second side 22. When both the second radiator 50 and the first radiator 10 are disposed along the second side 22, more longitudinal current can be excited, thereby improving radiation efficiency. When both the second radiator 50 and the first radiator 10 are disposed along the first side 21, the influence of holding the screen vertically on the resonant modes of the main branches and parasitic branches can be effectively avoided.

[0148] Please see Figure 15Taking antenna assembly 100 as an example of a T-shaped antenna, the T-shaped antenna is located on the right long side of the electronic device 1000 and near the bottom edge. Taking the first radiator 10 supporting the N28 band and the second radiator 50 supporting the B41 band and the Wi-Fi 2.4G band as an example.

[0149] The antenna assembly 100 provided in this application embodiment has a first radiator 10 with a size of 23 mm and a second radiator 50 with a size of 10 mm. Compared to the non-miniaturized antenna assembly 100, where the sum of the LB stub length of 50 mm and the parasitic stub length of 15 mm is 65 mm, the radiator length of the antenna assembly 100 provided in this application embodiment is reduced by half.

[0150] Please see Figure 20 , Figure 20 These are the S-parameter, radiation efficiency, and overall efficiency curves of the antenna assembly 100 provided in the third embodiment of this application. Curve a is the S-parameter curve of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the overall efficiency curve of the antenna assembly 100.

[0151] As can be seen from the S-parameter curves, the antenna assembly 100 provided in the third embodiment of this application resonates in the N28 band, B41 band, and Wi-Fi 2.4G band. The efficiency curves show that the overall efficiency of the antenna assembly 100 provided in the third embodiment of this application can reach within -5dB in the N28 band, B41 band, and Wi-Fi 2.4G band, which is far higher than the common efficiency of low-frequency antennas, which is around -10dB to -7dB. This indicates that the antenna assembly 100 provided in this embodiment still has good efficiency even when the length of the radiating stub is shortened to half its original length.

[0152] In other embodiments, by switching the second switching unit K2 to tune the electrical length of the parasitic stub, carrier aggregation (CA mode) where other frequency bands coexist with low frequency bands can also be achieved. For example, by switching the tuning branch of the second tuning circuit M2, the antenna assembly 100 can support the LB+UHB band or the LB+Wi-Fi 5G band.

[0153] This application provides further examples illustrating the specific structure of the antenna assembly 100.

[0154] Please see Figure 21 , Figure 21 This is a schematic diagram of the antenna assembly 100 provided in the fourth embodiment of this application. The antenna assembly 100 further includes a third radiator 60. The third radiator 60 includes a third free end E and a first ground end F disposed opposite to each other. A first coupling gap 61 is formed between the third free end E and the first free end B, and the first ground end F is grounded.

[0155] In this embodiment, the first radiator 10 and the third radiator 60 are capacitively coupled through the first coupling gap 61. "Capacitive coupling" means that an electric field is generated between the first radiator 10 and the third radiator 60, allowing electrical signals on the third radiator 60 to be transmitted to the first radiator 10 via the electric field. This enables electrical signal conduction between the first radiator 10 and the third radiator 60 even when they are not in direct contact or connection. Optionally, the first radiator 10 and the third radiator 60 can be arranged in a straight line or approximately in a straight line (i.e., with small tolerances during design).

[0156] In this embodiment, the third radiator 60 is a parasitic branch, and the first radiator 10 is a main branch.

[0157] The first radiator 10 and the third radiator 60 of the antenna assembly 100 provided in this embodiment form a port-to-port antenna.

[0158] When the signal source 40 excites the first radiator 10 to form the first resonant mode, it also forms a second sub-resonant mode on the third radiator 60. The current intensity of the first resonant mode is greater than the current intensity of the second sub-resonant mode, and the current direction of the second sub-resonant mode is opposite to the current direction of the first resonant mode.

[0159] Signal source 40 excites first radiator 10 and third radiator 60 to generate mode 1 and mode 2. Mode 1 is a quarter-wavelength mode (first resonant mode) of the main branch (first radiator 10), accompanied by a reverse current (current of the second sub-resonant mode) on the parasitic branch (third radiator 60).

[0160] For details, please refer to Figure 22 The current distribution in Mode 1 consists of a strong current flowing from feed point A to the first free terminal B on the main stub, and a weaker current flowing from the first ground terminal F to the third free terminal E. The resonant mode on the main stub contributes significantly to the efficiency of Mode 1, and the frequency band supported by the resonant mode on the main stub determines the effective frequency band of Mode 1. In other words, Mode 1 supports the first frequency band.

[0161] The signal source 40 also forms a third resonant mode supporting the third frequency band on the third radiator 60. The third resonant mode includes a third sub-resonant mode located on the third radiator 60 and a fourth sub-resonant mode located on the first radiator 10. The current intensity of the third sub-resonant mode is greater than the current intensity of the fourth sub-resonant mode. The current direction of the third sub-resonant mode is the same as the current direction of the fourth sub-resonant mode. The third sub-resonant mode is a 1 / 4 wavelength mode of the third frequency band.

[0162] This application does not specify a particular size for the third frequency band. Optionally, the third frequency band may include, but is not limited to, the LB band (less than or equal to 1 GHz), the MHB band (greater than 1 GHz and less than or equal to 3 GHz), or the UHB band (greater than 3 GHz). The third frequency band can be a 4G LTE (Long Term Evolution) band or a 5G NR band. Of course, the third frequency band can also be a GPS band, a Bluetooth band, or a Wi-Fi band, etc. The third frequency band can be determined according to actual needs.

[0163] Specifically, mode 2 is a quarter-wavelength mode of the parasitic branch (third radiator 60), accompanied by a unidirectional current (the current of the fourth sub-resonant mode) on the main branch (first radiator 10).

[0164] For details, please refer to Figure 23 The current distribution in Mode 2 consists of a weaker current flowing from feed point A to the first free end B on the main stub, and a stronger current flowing from the third free end E to the first ground end F. The resonant modes on the parasitic stub contribute significantly to the efficiency of Mode 2, and the frequency band supported by these resonant modes determines the effective frequency band of Mode 2. In other words, Mode 2 supports the third frequency band.

[0165] Mode 1 is also called high-mode balanced mode. Mode 2 is also called high-mode radiating mode. Generally, after the antenna assembly 100 generates high-mode radiating mode and high-mode balanced mode, the efficiency will be significantly improved, thereby improving the radiation efficiency (wave boost) within the antenna band.

[0166] When the first frequency band is close to the third frequency band, the frequency band supported by the main radiating branch and the frequency band supported by the parasitic branch form a continuous frequency band with good bandwidth.

[0167] This application does not specify the positions of the first radiator 10 and the third radiator 60.

[0168] Optionally, the distance between the feed point A and the corner point 23 is less than the distance between the first free end B and the corner point 23. That is, the first free end B is farther away from the corner point 23 relative to the feed point A. Of course, in other embodiments, the first free end B may also be located on the side of the feed point A facing the corner point 23.

[0169] Optionally, the length of the first side 21 is less than the length of the second side 22. Both the third radiator 60 and the first radiator 10 are positioned along either the first side 21 or the second side 22. When both the third radiator 60 and the first radiator 10 are positioned along the second side 22, more longitudinal current can be excited, thereby improving radiation efficiency. When both the third radiator 60 and the first radiator 10 are positioned along the first side 21, the influence of holding the screen vertically on the resonant modes of the main and parasitic nodes can be effectively avoided.

[0170] Please see Figure 21 The difference between this embodiment and the first embodiment is that, based on the first embodiment, a longer parasitic stub (third radiator 60, 40mm in length) is added to form a mouth-to-mouth antenna.

[0171] In this embodiment, the third frequency band supported by the parasitic stub is low frequency. By introducing a relatively long parasitic stub, this embodiment can realize a miniaturized monopole antenna and a mouth-to-mouth antenna formed by the parasitic antenna, achieving L+L dual low-frequency coverage without the need for switching tuning.

[0172] Please see Figure 24 , Figure 24 These are the S-parameters, radiation efficiency, and overall efficiency curves of the antenna assembly 100 provided in the fourth embodiment of this application. The first radiator 10 of the antenna assembly 100 (low-frequency antenna) has a length of 23 mm, approximately half the length of a normal low-frequency antenna radiator. The antenna assembly 100 (low-frequency antenna) operates in a 1 / 4 wavelength mode. The third radiator 60 has a length of approximately 40 mm.

[0173] Curve a is the S-parameter curve of antenna assembly 100. Curve b is the radiation efficiency curve of antenna assembly 100. Curve c is the overall efficiency curve of antenna assembly 100. As can be seen from the S-parameter curves, the antenna assembly 100 provided in the fourth embodiment of this application resonates in the N28 and N8 frequency bands. Specifically, the first frequency band covers the N28 frequency band, and the second frequency band covers the N8 frequency band.

[0174] As can be seen from the efficiency curves, the antenna assembly 100 provided in the fourth embodiment of this application has a total efficiency of -4.7dB in the N28 band and -6.4dB in the N8 band, which is much higher than the efficiency of low-frequency antennas, which is generally around -10dB to -7dB. This indicates that the antenna assembly 100 provided in this embodiment still has good efficiency even when the length of the radiating stub is shortened.

[0175] In this embodiment, the antenna assembly 100 adopts a corner-back-to-ground configuration, which not only ensures antenna efficiency but also shortens the size of the antenna assembly 100. It also achieves coverage of N28+N8 without switching, realizing CA mode for L+L dual low frequencies. For example, it enables N28+N8 to remain active without switching.

[0176] Generally, in a port-to-port antenna that generates radiating and balanced modes, the length of the parasitic stub is shorter than the length of the main stub. However, in this embodiment, the parasitic stub is longer than the main stub and still achieves good efficiency. This is because the reference ground plane 20 contributes significantly to the resonant modes of the main stub. Even if the length of the main stub is shortened, the reference ground plane 20 still has sufficient length to provide enough radiated energy for the first resonant mode, thereby improving the efficiency of the radiating modes in the port-to-port antenna. Furthermore, since the length of the parasitic stub is sufficiently long, approximately one-quarter of the wavelength of the third frequency band, it provides sufficient electrical length for the third resonant mode, thereby improving the efficiency of the balanced modes in the port-to-port antenna.

[0177] In this embodiment, the length of the third radiator 60 is not specifically limited. Optionally, the length of the third radiator 60 can be close to 1 / 4 wavelength of the third frequency band, laying the foundation for the signal source 40 to excite the third radiator 60 to form the third resonant mode.

[0178] Alternatively, the length of the third radiator 60 is less than 1 / 4 wavelength of the third frequency band.

[0179] Please see Figure 25 The antenna assembly 100 further includes a third tuning circuit M3. One end of the third tuning circuit M3 is electrically connected to the first ground terminal F. The other end of the third tuning circuit M3 is electrically connected to the reference ground plane 20. The resonant current of the third resonant mode can be grounded through the third tuning circuit M3. The third tuning circuit M3 is used to increase the current path of the resonant current of the third resonant mode on the third radiator 60, compensate for the electrical length of the third radiator 60, and make the electrical length of the third radiator 60 and the third tuning circuit M3 close to 1 / 4 wavelength of the third frequency band, thereby providing the electrical length condition for the third radiator 60 to generate the third resonant mode.

[0180] Furthermore, the length of the third radiator 60 is greater than or equal to 1 / 5 of the 1 / 4 wavelength corresponding to the third frequency band. In this embodiment, the length of the third radiator 60 can be shortened to 1 / 2 of the 1 / 4 wavelength corresponding to the third frequency band. In other words, the length of the third radiator 60 can be shortened to half of its original size. Taking the third frequency band as a low frequency (N8) as an example, when the length of the third radiator 60 is not shortened, the length of the third radiator 60 is approximately 40 mm. In this embodiment, the length of the third radiator 60 can be approximately 20 mm, which, while generating the third resonant mode, enables the third resonant mode to have relatively good radiation efficiency and achieves miniaturization of the antenna assembly 100.

[0181] Optionally, the third tuning circuit M3 includes a third inductor (not shown). One end of the third inductor is electrically connected to the first ground terminal F, and the other end of the third inductor is grounded. In this way, the resonant current of the third resonant mode can be grounded from the third radiator 60 and the third inductor. The sum of the equivalent electrical length of the third inductor and the electrical length of the third radiator 60 is close to 1 / 4 wavelength of the third frequency band, so that the antenna assembly 100 has the electrical length conditions for generating the third resonant mode.

[0182] Furthermore, the third tuning circuit M3 is an impedance-adjustable circuit, or in other words, an antenna switching circuit.

[0183] Optional, please refer to Figure 26 The third tuning circuit M3 includes a third switching unit K3 and multiple third tuning branches T3. The fixed terminal of the third switching unit K3 is electrically connected to the first ground terminal F. Each third tuning branch T3 has a different impedance, and one end of each third tuning branch T3 is electrically connected to the selection terminal of the third switching unit K3. The other end of each third tuning branch T3 is electrically connected to the reference ground plane 20. The third switching unit K3 is a switching transistor, including but not limited to at least one of a triode, transistor, or field-effect transistor. The third tuning branches T3 can be inductors with different inductance values. When the third switching unit K3 switches to different third tuning branches T3, the third tuning branches T3 have different impedances, i.e., different equivalent electrical lengths. This changes the electrical length of the current path, thereby changing the magnitude of the third frequency band supported by the third resonant mode. When both the first and third frequency bands are low frequencies, dual low-frequency adjustment is achieved.

[0184] This embodiment designs a third radiator 60 as a parasitic stub based on the third embodiment, in order to improve efficiency, miniaturize the antenna, and achieve L+L dual low frequency constant operation without switching.

[0185] Of course, this embodiment can also design a third radiator 60 based on the first embodiment to improve efficiency and achieve L+L dual low frequency constant operation without switching.

[0186] Of course, this embodiment can also design a third radiator 60 based on the third embodiment, that is, a new antenna unit formed by a T-shaped antenna and a parasitic antenna, as an antenna to improve efficiency, miniaturize the antenna, realize the L+L dual low frequency without switching and standby, and generate multiple resonant modes to support more frequency bands, such as the L+L+B41 frequency band without switching and standby.

[0187] Please see Figure 25 The difference between this embodiment and the fourth embodiment is that the length of the third radiator 60 in this embodiment is shortened to half of the original length, approximately 20 mm.

[0188] In this embodiment, the third frequency band supported by the parasitic stub is low frequency. By introducing a short parasitic stub and combining it with the third tuning circuit M3, this embodiment can realize a mouth-to-mouth antenna formed by a miniaturized monopole antenna and a short parasitic antenna, achieving L+L dual low-frequency adjustable antenna coverage without the need for switching tuning.

[0189] Please see Figure 27 , Figure 27 These are the S-parameters, radiation efficiency, and overall efficiency curves of the antenna assembly 100 provided in the fifth embodiment of this application. The first radiator 10 of the antenna assembly 100 (low-frequency antenna) has a length of 23 mm, approximately half the length of a normal low-frequency antenna radiator. The antenna assembly 100 (low-frequency antenna) operates in a 1 / 4 wavelength mode. The third radiator 60 has a length of approximately 20 mm.

[0190] Curve a is the S-parameter curve of antenna assembly 100. Curve b is the radiation efficiency curve of antenna assembly 100. Curve c is the overall efficiency curve of antenna assembly 100. As can be seen from the S-parameter curves, the antenna assembly 100 provided in the fifth embodiment of this application resonates in the N28 and N8 frequency bands. Specifically, the first frequency band covers the N28 frequency band, and the second frequency band covers the N8 frequency band.

[0191] As can be seen from the efficiency curves, the antenna assembly 100 provided in the fourth embodiment of this application has a total efficiency of -6.9dB in the N28 band and -5.6dB in the N8 band, which is much higher than the efficiency of low-frequency antennas, which is generally around -10dB to -7dB. This indicates that the antenna assembly 100 provided in this embodiment still has good efficiency even when the length of the radiating stub is shortened.

[0192] In this embodiment, the antenna assembly 100 adopts a corner-back-to-ground configuration, which not only ensures antenna efficiency but also shortens the size of the antenna assembly 100. It also achieves coverage of N28+N8 without switching, realizing CA mode for L+L dual low frequencies. For example, it enables N28+N8 to remain active without switching.

[0193] In other embodiments, by switching the third switching unit K3 and tuning the electrical length of the parasitic stub, carrier aggregation (CA mode) where other frequency bands coexist with low frequency bands can also be achieved. For example, by switching the tuning branch of the third tuning circuit M3, the antenna assembly 100 can support the LB+GPS-L5 band, or the LB+GPS-L1 band, or the LB+UHB band, or the LB+B41 band, or the LB+Wi-Fi 5G band.

[0194] Please see Figure 28 , Figure 28 These are alternative S-parameter, radiation efficiency, and overall efficiency curves of the antenna assembly 100 after tuning to the third frequency band, as provided in the fifth embodiment of this application. Curve a is the S-parameter curve of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the overall efficiency curve of the antenna assembly 100. From the S-parameter curves, it can be seen that the antenna assembly 100 provided in the fifth embodiment of this application resonates in the N28 and GPS-L5 frequency bands. The first frequency band covers the N28 frequency band, and the third frequency band covers the GPS-L5 frequency band. From the efficiency curves, it can be seen that the overall efficiency of the antenna assembly 100 provided in the fifth embodiment of this application in the N28 and N8 frequency bands is much higher than the generally low-frequency antenna efficiency of around -10dB to -7dB. This indicates that the antenna assembly 100 provided in this embodiment still has good efficiency even when the length of the radiating stub is shortened, and the size of the third frequency band can also be adjusted by switching.

[0195] Please see Figure 29 , Figure 29 This is a schematic diagram of the antenna assembly 100 provided in the sixth embodiment of this application. This embodiment differs from the fifth embodiment in that, in this embodiment, a second radiator 50 is provided on the side of the first radiator 10 away from the third radiator 60, and the length of the second radiator 50 is relatively very short. Further, the length of the second radiator 50 can be less than 1 / 5 of the 1 / 4 wavelength mode of the second frequency band. The first radiator 10 and the second radiator 50 form a T-shaped antenna. One end of this T-shaped antenna is relatively short. The first radiator 10 and the third radiator 60 form a port-to-port antenna. The resonant mode on this T-shaped antenna is the same as the resonant mode of the T-shaped antenna, thus increasing the number of resonant modes on the antenna assembly 100. At least three resonant modes can be generated on the antenna assembly 100, for example, LB+GPS+UHB band, LB+MHB+UHB band, LB+UHB+Wi-Fi 5G band, etc. Among them, the first frequency band is the LB band, and the second frequency band is the UHB band, Wi-Fi 5G band, etc. The third frequency band is GPS-L1, or GPS-L5, or Wi-Fi 2.4G, or MHB, or UHB, etc.

[0196] In this embodiment, the length of the third radiator 60 can be close to 1 / 4 wavelength of the third frequency band.

[0197] In this embodiment, the length of the third radiator 60 may be less than 1 / 4 wavelength of the third frequency band. Furthermore, the length of the third radiator 60 may be close to 1 / 2 of 1 / 4 wavelength of the third frequency band, promoting the miniaturization of the antenna assembly 100.

[0198] Taking antenna assembly 100 supporting LB+GPS+UHB as an example, the LB band mode and GPS band mode in this embodiment can refer to the first resonant mode and the third resonant mode in the fifth embodiment. Compared with the fifth embodiment, this embodiment adds a third mode. The third resonant mode can refer to the second resonant mode in the third embodiment. The second resonant mode is mainly a 1 / 2 wavelength mode from the end of the first radiator 10 away from the second radiator 50 to the end of the second radiator 50 away from the first radiator 10. This mode can cover the UHB band. Therefore, based on the fifth embodiment, this embodiment can additionally cover UHB, satisfying the simultaneous support of LB+GPS-L5+UHB bands. Thus, the antenna assembly 100 provided in this embodiment can simultaneously cover the LB band + GPS-L5 band + UHB band, and can achieve adjustable LB band and adjustable UHB band without affecting the GPS-L5 band, that is, the GPS-L5 band is always present. In addition, the GPS-L5 band supported by the third radiator 60 can also be adjusted to other bands.

[0199] Please see Figure 30 , Figure 30 These are the S-parameter, radiation efficiency, and overall efficiency curves of the antenna assembly 100 provided in the sixth embodiment of this application. Curve a is the S-parameter curve of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the overall efficiency curve of the antenna assembly 100.

[0200] As can be seen from the S-parameter curves, the antenna assembly 100 provided in the sixth embodiment of this application resonates in the N28, GPS-L5, and N78 frequency bands. The efficiency curves show that the overall efficiency of the antenna assembly 100 provided in the sixth embodiment of this application in the N28, GPS-L5, and N78 frequency bands can reach within -5dB, which is far higher than the common efficiency of low-frequency antennas, which is around -10dB to -7dB. Since the modes corresponding to the N78 frequency band include high-mode balanced modes and high-mode radiating modes, the N78 frequency band has a relatively wide frequency bandwidth. This indicates that the antenna assembly 100 provided in this embodiment of the application has good efficiency even with a short radiating stub length and can simultaneously support multiple frequency bands.

[0201] Please see Figure 31 , Figure 31This is a schematic diagram of the antenna assembly 100 provided in the seventh embodiment of this application. This embodiment differs from the sixth embodiment in that the length of the second radiator 50 is slightly smaller than the length of the first radiator 10, and greater than 1 / 5 of the 1 / 4 wavelength mode of the second frequency band. The first radiator 10 and the second radiator 50 form a T-shaped antenna. The first radiator 10 and the third radiator 60 form a port-to-port antenna. The resonant mode on this T-shaped antenna is the same as the resonant mode of the T-shaped antenna, thus increasing the number of resonant modes on the antenna assembly 100. At least three resonant modes can be generated on the antenna assembly 100, for example, LB+GPS+LB band, LB+LB+Wi-Fi 2.4G band, etc. Among them, the first and second frequency bands are both LB bands, and the third frequency band is GPS-L1, or GPS-L5, or Wi-Fi 2.4G band.

[0202] In this embodiment, the length of the third radiator 60 can be close to 1 / 4 wavelength of the third frequency band.

[0203] In this embodiment, the length of the third radiator 60 may be less than 1 / 4 wavelength of the third frequency band. Furthermore, the length of the third radiator 60 may be close to 1 / 2 of 1 / 4 wavelength of the third frequency band, promoting the miniaturization of the antenna assembly 100.

[0204] In the above embodiments, the shortening of the radiator length can be achieved by switching the frequency band size through the switching unit of the tuning circuit. For example, the first tuning circuit M1 can achieve switching between the low-frequency B71 band, or the B28 band, or the B5 band, or the B8 band. The second band can achieve multi-frequency switching through the second tuning circuit M2, and the third band can achieve multi-frequency switching through the third tuning circuit M3.

[0205] Please see Figure 32 , Figure 32 This is a schematic diagram of the structure of the antenna assembly 100 provided in the eighth embodiment of this application.

[0206] Based on the seventh embodiment, the antenna assembly 100 further includes a fourth radiator 70. The fourth radiator 70 includes a fourth free end F and a second ground end G disposed opposite to each other, with a second coupling gap 71 between the fourth free end F and the second free end D. The second ground end G is grounded.

[0207] In this embodiment, the fourth radiator 70 is a parasitic branch, and the second radiator 50 is a main branch.

[0208] The second radiator 50 and the fourth radiator 70 of the antenna assembly 100 provided in this embodiment form a port-to-port antenna.

[0209] When the signal source 40 excites the second radiator 50 to form the second resonant mode, a fifth sub-resonant mode is formed on the fourth radiator 70. The current intensity of the second resonant mode is greater than the current intensity of the fifth sub-resonant mode, and the current direction of the fifth sub-resonant mode is opposite to the current direction of the second resonant mode.

[0210] Signal source 40 excites second radiator 50 and fourth radiator 70 to generate mode 1 and mode 2. Mode 1 is a quarter-wavelength mode (second resonant mode) of the off-center main branch (second radiator 50), accompanied by a reverse current (current of the fifth sub-resonant mode) on the parasitic branch (fourth radiator 70).

[0211] Specifically, the current distribution in Mode 1 consists of a stronger current flowing from feed point A to the second free terminal D on the main stub, and a weaker current flowing from the second ground terminal G to the fourth free terminal F. The resonant mode on the main stub contributes significantly to the efficiency of Mode 1, and the frequency band supported by this mode determines the effective frequency band of Mode 1. In other words, Mode 1 supports the first frequency band.

[0212] The signal source 40 also forms a fourth resonant mode supporting the fourth frequency band on the fourth radiator 70. The fourth resonant mode includes a sixth sub-resonant mode located on the fourth radiator 70 and a seventh sub-resonant mode located on the second radiator 50. The current intensity of the sixth sub-resonant mode is greater than the current intensity of the seventh sub-resonant mode. The current direction of the sixth sub-resonant mode is the same as that of the seventh sub-resonant mode. The sixth sub-resonant mode is a 1 / 4 wavelength mode of the fourth frequency band.

[0213] Specifically, mode 2 is a quarter-wavelength mode of the parasitic branch (fourth radiator 70), accompanied by a unidirectional current (the current of the seventh sub-resonant mode) on the main branch (second radiator 50).

[0214] Specifically, the current distribution in Mode 2 consists of a weaker current flowing from feed point A to the second free terminal D on the main stub, and a stronger current flowing from the fourth free terminal F to the second ground terminal G. The resonant modes on the parasitic stub contribute significantly to the efficiency of Mode 2, and the frequency band supported by these resonant modes determines the effective frequency band of Mode 2. In other words, Mode 2 supports the fourth frequency band.

[0215] Mode 1 is also called high-mode balanced mode. Mode 2 is also called high-mode radiating mode. Generally, after the antenna assembly 100 generates high-mode radiating mode and high-mode balanced mode, the efficiency will be significantly improved, thereby improving the radiation efficiency (wave boost) within the antenna band.

[0216] When the first frequency band is close to the fourth frequency band, the frequency band supported by the main radiating branch and the frequency band supported by the parasitic branch form a continuous frequency band with good bandwidth.

[0217] In this embodiment, the length of the fourth radiator 70 can be close to 1 / 4 wavelength of the fourth frequency band.

[0218] In this embodiment, the length of the fourth radiator 70 may be less than 1 / 4 wavelength of the fourth frequency band. Furthermore, the length of the fourth radiator 70 may be close to 1 / 2 of 1 / 4 wavelength of the fourth frequency band, promoting the miniaturization of the antenna assembly 100.

[0219] Please see Figure 32 The antenna assembly 100 further includes a fourth tuning circuit M4. One end of the fourth tuning circuit M4 is electrically connected to the second ground terminal G. The other end of the fourth tuning circuit M4 is electrically connected to the reference ground plane 20. The resonant current of the fourth resonant mode can be grounded through the fourth tuning circuit M4. The fourth tuning circuit M4 is used to increase the current path of the resonant current of the fourth resonant mode on the fourth radiator 70.

[0220] This antenna assembly 100 can achieve simultaneous coexistence of multiple frequency bands, and by reducing the length of the antenna radiator, it can achieve miniaturization, broadband, and good efficiency.

[0221] The fourth tuning circuit M4 can be referenced from the third tuning circuit M3, and will not be described in detail here.

[0222] Please see Figure 33 , Figure 33 This is a schematic diagram of the antenna assembly 100 provided in the ninth embodiment of this application. Based on the third embodiment, in this embodiment, the first radiator 10 and the second radiator 50 are integrally connected to form a T-shaped antenna, and the second radiator 50 and the fourth radiator 70 form a port-to-port antenna. This antenna assembly 100 can achieve simultaneous coexistence of multiple frequency bands, and by reducing the length of the antenna radiators, it can achieve miniaturization, broadband coverage, and good efficiency.

[0223] 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 reference floor includes a first side and a second side that are bent and connected, with the connection between the first side and the second side forming a corner point; A first radiator is disposed along the second side. The first radiator includes a feed point and a first free end and a connecting end disposed opposite to each other. The feed point and the first free end are spaced apart. An electrical connector, one end of which is electrically connected to the connection end, and the other end of which is electrically connected to the reference ground, wherein the distance between the electrical connector and the corner point is less than or equal to 1 / 16 wavelength of the first frequency band; and A signal source electrically connected to the feed point is used to excite a ground current that converges on the electrical connector on the reference ground plane. At least a portion of the ground current is distributed along the first side and the second side. The signal source is also used to excite at least one first resonant mode supporting the first frequency band to be formed on the first radiator. The resonant current of the first resonant mode on the first radiator flows from the connection end to the first free end. The first resonant mode is a 1 / 4 wavelength mode. The ground current is used to improve the radiation efficiency of the first frequency band.

2. The antenna assembly as claimed in claim 1, characterized in that, The power supply point is located at the connection end; or, the power supply point is located between the connection end and the first free end.

3. The antenna assembly as described in claim 2, characterized in that, The length of the first radiator is less than 1 / 4 wavelength of the first frequency band; The antenna assembly further includes a first tuning circuit, one end of which is electrically connected to the other end of the electrical connector, and the other end of which is electrically connected to the reference ground. The first tuning circuit is used to compensate for the electrical length of the first radiator.

4. The antenna assembly as described in claim 3, characterized in that, The length of the first radiator is greater than or equal to 1 / 5 times the 1 / 4 wavelength corresponding to the first frequency band.

5. The antenna assembly as claimed in claim 4, characterized in that, The first tuning circuit includes a switching unit and multiple tuning branches. The fixed end of the switching unit is electrically connected to the other end of the electrical connector. Each tuning branch has a different impedance. One end of each tuning branch is electrically connected to the selection end of the switching unit, and the other end of each tuning branch is electrically connected to the reference ground.

6. The antenna assembly as described in any one of claims 2-5, characterized in that, The feed point is located at the connection end, and the antenna assembly further includes a second radiator disposed along the first side, one end of the second radiator being connected to the connection end, and the other end of the second radiator being a second free end.

7. The antenna assembly as claimed in claim 6, characterized in that, The signal source excites the first resonant mode formed on the first radiator, which also excites a resonant current on the second radiator. The current intensity of the resonant current of the first resonant mode on the first radiator is greater than that of the resonant current of the first resonant mode on the second radiator. The current direction of the resonant current of the first resonant mode on the first radiator is opposite to that of the resonant current of the first resonant mode on the second radiator.

8. The antenna assembly as claimed in claim 6, characterized in that, The signal source also forms a second resonant mode supporting the second frequency band on the first radiator and the second radiator. The current intensity of the second resonant mode on the second radiator is greater than the current intensity of the second resonant mode on the first radiator. The current direction of the second resonant mode on the second radiator is the same as the current direction of the second resonant mode on the first radiator. The second resonant mode is a 1 / 2 wavelength mode of the second frequency band.

9. The antenna assembly as claimed in claim 8, characterized in that, The size of the second radiator is less than 1 / 4 wavelength of the second frequency band, and greater than or equal to 1 / 5 times 1 / 4 wavelength of the second frequency band.

10. The antenna assembly as claimed in claim 9, characterized in that, The antenna assembly further includes a second tuning circuit, one end of which is electrically connected to the feed point and the other end of which is electrically connected to the reference ground. The resonant current of the second resonant mode can flow through the reference ground and the second tuning circuit to the second radiator. The second tuning circuit is used to increase the current path of the resonant current of the second resonant mode on the second radiator.

11. The antenna assembly as claimed in claim 6, characterized in that, The distance between the power supply point and the corner point is less than the distance between the first free end and the corner point; The length of the first side is less than the length of the second side, and at least a portion of the first radiator is disposed along the second side, and at least a portion of the second radiator is disposed along the first side; or... Both the second radiator and the first radiator are arranged along the first side or the second side.

12. The antenna assembly as described in any one of claims 2-5 and 7-11, characterized in that, The antenna assembly further includes a third radiator, which includes a third free end and a first ground end disposed opposite to each other. A first coupling gap is formed between the third free end and the first free end, and the first ground end is grounded.

13. The antenna assembly as claimed in claim 12, characterized in that, When the signal source excites the first radiator to form the first resonant mode, a second sub-resonant mode is formed on the third radiator. The current intensity of the first resonant mode is greater than the current intensity of the second sub-resonant mode, and the current direction of the second sub-resonant mode is opposite to the current direction of the first resonant mode.

14. The antenna assembly as claimed in claim 13, characterized in that, The signal source also forms a third resonant mode supporting the third frequency band on the third radiator. The third resonant mode includes a third sub-resonant mode located on the third radiator and a fourth sub-resonant mode located on the first radiator. The current intensity of the third sub-resonant mode is greater than that of the fourth sub-resonant mode. The current direction of the third sub-resonant mode is the same as that of the fourth sub-resonant mode. The third sub-resonant mode is a 1 / 4 wavelength mode of the third frequency band.

15. The antenna assembly as claimed in claim 14, characterized in that, The length of the first side is less than the length of the second side, and the third radiator is disposed along the second side.

16. The antenna assembly as claimed in claim 14, characterized in that, The length of the third radiator is less than 1 / 4 wavelength of the third frequency band; The antenna assembly further includes a third tuning circuit, one end of which is electrically connected to the first ground terminal, and the other end of which is electrically connected to the reference ground. The resonant current of the third resonant mode can be grounded through the third tuning circuit. The third tuning circuit is used to increase the current path of the resonant current of the third resonant mode on the third radiator.

17. The antenna assembly as described in any one of claims 8-10, characterized in that, The antenna assembly further includes a fourth radiator, which includes a fourth free end and a second ground end disposed opposite to each other. A second coupling gap is formed between the fourth free end and the second free end, and the second ground end is grounded.

18. An electronic device, characterized in that, Includes the antenna assembly as described in any one of claims 1-17.

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