Antenna assembly and electronic equipment

Abstract

The invention discloses an antenna assembly and electronic equipment. A first radiator comprises a first end, a feeding point and a second end. The second radiator and the first radiator are arranged in parallel and opposite to each other, and a coupling gap is formed between the second radiator and the first radiator; the second radiator comprises a third end, a grounding point and a fourth end which are arranged in sequence. One end of the tuning circuit is electrically connected with the grounding point, the other end of the tuning circuit is grounded, and the tuning circuit is used for increasing the electrical length of the second radiator; the second radiator forms a first resonance current flowing from the third end to the grounding point and passing through the grounding point to the ground and a second resonance current flowing from the fourth end to the grounding point and passing through the grounding point to the ground under the excitation of the signal source; the mode of the first resonance current and the mode of the second resonance current are both 1 / 4 wavelength modes of the first frequency band, and the length of the second radiator is (1 / 6-1 / 4) wavelength of the first frequency band. According to the antenna assembly and the electronic equipment provided by the invention, miniaturization is realized, and the occupied space is saved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an antenna assembly and an electronic device. Background Art

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

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

[0004] The present application provides an antenna assembly, comprising:

[0005] A first radiator, comprising a first end, a feeding point and a second end;

[0006] a signal source, the signal source being electrically connected to the feeding point, the signal source being used to provide an excitation signal; and

[0007] A second radiator, wherein the second radiator is parallel to and opposite to the first radiator, and a coupling gap is formed between the second radiator and the first radiator; the second radiator comprises a third end, a grounding point and a fourth end which are arranged in sequence, and a tuning circuit, wherein one end of the tuning circuit is electrically connected to the grounding point, and the other end of the tuning circuit is grounded, and the tuning circuit is used to increase the electrical length of the second radiator; the second radiator forms a first resonance mode supporting a first frequency band under the excitation of the signal source, and the resonance current of the first resonance mode comprises a first resonance current flowing from the third end to the grounding point and going down to the ground through the grounding point, and a second resonance current flowing from the fourth end to the grounding point and going down to the ground through the grounding point; the mode of the first resonance current and the mode of the second resonance current are both 1 / 4 wavelength modes of the first frequency band, and the length of the second radiator is (1 / 6-1 / 4) wavelength of the first frequency band.

[0008] The present application also provides an electronic device, comprising the antenna assembly.

[0009] The antenna assembly and electronic device provided by the present application are designed such that the first radiator includes a first end, a feeding point and a second end; a signal source is electrically connected to the feeding point, and the signal source is used to provide an excitation signal; the second radiator is parallel and relatively arranged to the first radiator, and a coupling gap is formed between the second radiator and the first radiator; the first radiator and the second radiator are offset and parallel coupled; the second radiator includes a third end, a grounding point and a fourth end which are arranged in sequence, and the grounding point is grounded through a tuning circuit, and the tuning circuit is used to increase the electrical length of the second radiator; the second radiator forms a first resonance mode supporting the first frequency band under the excitation of the signal source, and the resonance current of the first resonance mode includes a current flowing from the third end to the grounding point and passing through the grounding point. a first resonant current flowing from the third end to the grounding point and to the ground via the grounding point, and a second resonant current flowing from the fourth end to the grounding point and to the ground via the grounding point; the mode of the first resonant current and the mode of the second resonant current are both 1 / 4 wavelength modes of the first frequency band, and the length of the second radiator is (1 / 6-1 / 4) wavelength of the first frequency band. Through the above design, when the length of the second radiator is shortened to 1 / 2-1 / 3 of the original length, it can also have sufficient electrical length to generate a 1 / 4 wavelength current flowing from the third end to the grounding point and to the ground via the grounding point, and a 1 / 4 wavelength current flowing from the fourth end to the grounding point and to the ground via the grounding point, thereby generating a first resonant mode supporting the first frequency band, so as to reduce the size of the antenna component and save the space occupied. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0011] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0012] Figure 2 It is a schematic diagram of the partial structure disassembly of an electronic device provided in an embodiment of the present application;

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

[0014] Figure 4 is a structural schematic diagram of an antenna assembly provided in an embodiment of the present application;

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

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

[0017] Figure 7is a structural schematic diagram of another position of the first radiator in the antenna assembly provided in an embodiment of the present application;

[0018] Figure 8 is a structural schematic diagram of another position of the first radiator in the antenna assembly provided in an embodiment of the present application;

[0019] Fig. 9 is a current distribution diagram of a third resonance mode of an antenna assembly provided in an embodiment of the present application;

[0020] Fig.10 is a current distribution diagram of a fourth resonance mode of an antenna assembly provided in an embodiment of the present application;

[0021] Fig.11 is a structural schematic diagram of a tuning circuit provided in an embodiment of the present application;

[0022] Fig.12 It is a structural schematic diagram of an antenna assembly provided in an embodiment of the present application being arranged at another position on an electronic device;

[0023] Fig.13 It is a structural schematic diagram of an antenna assembly provided in an embodiment of the present application being arranged on the side of an electronic device;

[0024] Fig.14 are the S parameter curve and efficiency curve of the antenna assembly provided in the embodiment of the present application;

[0025] Fig.15 It is a comparison diagram of the S parameter curve of the miniaturized LB antenna with staggered coupling feed and the S parameter curve of the T-shaped direct-fed antenna provided in the embodiment of the present application;

[0026] Fig.16 It is a comparison diagram of the efficiency curve of the miniaturized LB antenna with staggered coupling feed and the efficiency curve of the T-shaped direct-fed antenna provided in the embodiment of the present application;

[0027] Fig.17 It is an S parameter curve of the antenna assembly provided in an embodiment of the present application when the tuning circuit switches the LB sub-band.

[0028] Explanation of the accompanying drawings: electronic device 1000; antenna assembly 100; display screen 200; middle frame 300; back cover 400; middle plate 310; frame 320; top edge 321; first side edge 322; bottom edge 323; second side edge 324; first radiator 10; signal source 20; second radiator 30; tuning circuit 40; first end A; feeding point B; second end C; third end D; grounding point E; fourth end F; first current zero point Q1; second current zero point Q2; first dividing point H; second dividing point J; matching circuit M1; switch unit K; tuning branch T; reference floor 50. DETAILED DESCRIPTION

[0029] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0030] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0031] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0032] See also Figure 1 , Figure 1 The following is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. The electronic device 1000 includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, a robot, a digital camera, and other devices with communication functions. The present embodiment of the present application is described using a mobile phone as an example, and other electronic devices may refer to this embodiment.

[0033] See also Figure 2 , the electronic device 1000 includes an antenna assembly 100. The antenna assembly 100 can improve antenna efficiency.

[0034] See also Figure 2, taking the electronic device 1000 as a mobile phone as an example, the working environment of the antenna assembly 100 is illustrated. The electronic device 1000 includes a display screen 200, a middle frame 300 and a back cover 400 arranged in sequence along the thickness direction. Among them, the middle frame 300 includes a middle plate 310 and a frame 320 surrounding the side of the middle plate 310. Of course, in other embodiments, the electronic device 1000 may not have a middle plate 310. The display screen 200, the middle plate 310 and the back cover 400 are stacked in sequence, and a receiving space is formed between the display screen 200 and the middle plate 310, and between the middle plate 310 and the back cover 400 to accommodate components such as a main board, a camera module, a receiver module, a battery, and various sensors. One side of the frame 320 is surrounded by the edge of the display screen 200, and the other side of the frame 320 is surrounded by the edge of the back cover 400 to form a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, and the frame 320 and the back cover 400 may be separate structures. The above is the working environment of the antenna assembly 100 taking a mobile phone as an example, but the antenna assembly 100 of the present application is not limited to the above working environment.

[0035] See also Figure 3 The frame 320 includes a top edge 321, a first side edge 322, a bottom edge 323 and a second side edge 324 connected end to end. The top edge 321 is disposed opposite to the bottom edge 323, and the first side edge 322 is disposed opposite to the second side edge 324.

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

[0037] The frame 320 is roughly rectangular. In an optional embodiment, the top edge 321 and the bottom edge 323 are the short sides of the frame, and the first side edge 322 and the second side edge 324 are the long sides of the frame. In other embodiments, the electronic device 1000 can also be a foldable electronic device, the top edge 321 and the bottom edge 323 are the short sides of the frame when unfolded, and the first side edge 322 and the second side edge 324 are the long sides of the frame when unfolded. In other embodiments, the top edge 321 and the bottom edge 323 can also be the long sides of the frame, and the first side edge 322 and the second side edge 324 can also be the short sides of the frame 320. The length of the short side is less than the long side of the long side. In addition, the lengths of the top edge 321 and the first side edge 322 can also be the same.

[0038] See also Figure 4 The antenna assembly 100 provided in the embodiment of the present application includes a first radiator 10, a signal source 20, a second radiator 30, and a tuning circuit 40.

[0039] The first radiator 10 is a port for the antenna assembly 100 to send and receive radio frequency signals. The radio frequency signal is transmitted in the air medium in the form of an electromagnetic wave signal. The present application does not specifically limit the material of the first radiator 10. Optionally, the material of the first radiator 10 is a conductive material, including but not limited to conductive materials such as metals and alloys.

[0040] The present 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 a strip, a sheet, a rod, a coating, a film, and the like. Figure 4 The first radiator 10 shown is only an example and does not limit the shape of the first radiator 10 provided in the present application. In the present embodiment, the first radiators 10 are all in the shape of strips. The present application does not limit the extension trajectory of the first radiator 10. Optionally, the first radiator 10 may extend along a straight line, or along a curve, or along a bend line. In the present embodiment, the first radiator 10 is in the shape of a straight line. In other embodiments, the first radiator 10 may also extend along a trajectory such as a bend line. The above-mentioned first radiator 10 may be a line with uniform width on the extension trajectory, or may be a strip with unequal width such as a gradient width and a widened area.

[0041] The present application does not specifically limit the form of the first radiator 10. Optionally, the form of the first radiator 10 includes but is not limited to a metal frame 320, a metal frame embedded in a plastic frame 320, a metal first radiator 10 located in or on the frame 320, a flexible printed circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct structured antenna by laser direct structure (LDS), a printed direct structured antenna by printing direct structure (PDS), a conductive sheet antenna (such as a metal bracket antenna), etc. In the present application, the first radiator 10 is taken as a part of the metal frame 320 as an example.

[0042] See also Figure 4 The first radiator 10 includes a first end A, a feeding point B and a second end C. The first end A and the second end C are both ends disconnected from other structures. The first end A and the second end C can also be called free ends. The present application does not specifically limit the position of the feeding point B between the first end A and the second end C.

[0043] Optionally, the feeding point B is located at the first end A, or at the second end C, or between the first end A and the second end C.

[0044] The signal source 20 is electrically connected to the feeding point B, and the signal source 20 is used to provide an excitation signal.

[0045] The signal source 20 includes but is not limited to a radio frequency transceiver chip, etc. The signal source 20 is used to provide a radio frequency excitation current, that is, the above-mentioned excitation signal.

[0046] In the embodiment of the present application, the signal source 20 is disposed on the mainboard. The electrical connection method between the signal source 20 and the feeding point B includes but is not limited to direct welding, or indirect connection through coaxial lines, microstrip lines, conductive springs, conductive glue, coupling connection, etc. Specifically, the signal source 20 is electrically connected to the feeding point B through a feeding spring (conductive spring) disposed on the mainboard.

[0047] The second radiator 30 can refer to the first radiator 10. Optionally, the first radiator 10 is a part of the metal frame 320 of the electronic device, and the second radiator 30 is a metal insert inside the metal frame 320. Optionally, the first radiator 10 and the second radiator 30 are both metal inserts of the electronic device 1000.

[0048] The second radiator 30 is arranged parallel to and opposite to the first radiator 10. Insulating material may be filled between the second radiator 30 and the first radiator 10. A coupling gap is formed between the second radiator 30 and the first radiator 10. Taking the first radiator 10 and the second radiator 30 as an example of a long strip, the direction in which the first radiator 10 and the second radiator 30 are opposite to each other is perpendicular to the extension direction of the first radiator 10. In other words, the first radiator 10 and the second radiator 30 are offset coupling antennas relative to the mouth-to-mouth antennas in which the ends are opposite to each other. The first radiator 10 and the second radiator 30 are face-to-face.

[0049] See also Figure 4 , the second radiator 30 includes a third end D, a grounding point E and a fourth end F which are arranged in sequence. The third end D and the fourth end F are both ends disconnected from other structures. The third end D and the fourth end F can also be called free ends. The present application does not specifically limit the position of the grounding point E between the third end D and the fourth end F. Optionally, the grounding point E is located near the center point between the third end D and the fourth end F.

[0050] See also Figure 4, one end of the tuning circuit 40 is electrically connected to the ground point E, and the other end of the tuning circuit 40 is grounded. The tuning circuit 40 is used to increase the electrical length of the second radiator 30. Further, when the resonant current on the second radiator 30 is grounded through the tuning circuit 40, the tuning circuit 40 can increase the electrical length of the resonant current. Optionally, the tuning circuit 40 includes at least an inductor element L, and the inductor element L is used to increase the electrical length of the resonant current. Of course, the tuning circuit 40 can also include small capacitors, resistors and other devices.

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

[0052] The mode of the first resonant current and the mode of the second resonant current are both 1 / 4 wavelength modes of the first frequency band. If the grounding point E of the second radiator 30 is directly grounded, then the electrical length of the second radiator 30 is 1 / 2 wavelength of the first frequency band, so as to realize the first resonant current of 1 / 4 wavelength mode and the second resonant current of 1 / 4 wavelength mode formed on the second radiator 30.

[0053] In this embodiment, an inductor element L is provided at the grounding point E, and the inductor element L is a large inductor. When the first resonant current passes through the inductor element L and is grounded, the inductor element L can increase the electrical length of the first resonant current. When the second resonant current passes through the inductor element L and is grounded, the inductor element L can increase the electrical length of the second resonant current. The inductor element L makes the length of the second radiator 30 the (1 / 6-1 / 4) wavelength of the first frequency band, the electrical length of the first resonant current from the third end D-grounding point E-inductor element L to the ground is approximately 1 / 4 wavelength of the first frequency band, and the electrical length of the second resonant current from the fourth end F-grounding end-inductor element L to the ground is approximately 1 / 4 wavelength of the first frequency band. In this way, the length of the second radiator 30 is reduced to 1 / 2-1 / 3 of the original (1 / 2 wavelength), thereby realizing the miniaturization of the antenna assembly 100.

[0054] The present application does not specifically limit the inductance value of the inductor element L. For example, when the first frequency band is the LB frequency band, the inductance value of the inductor element L may be 10 nh.

[0055] Generally, in order to support a required frequency band, such as the LB frequency band, a resonant mode supporting the required frequency band needs to be generated, such as a 1 / 4 wavelength mode (fundamental mode) of the LB frequency band generated on the second radiator 30. Generally, the length of the low-frequency antenna is about 50 mm, and when the electronic device 1000 is a mobile phone, the space on the mobile phone is limited, and the space occupied by the LB frequency band is too large, which will cause the space of other antennas to be compressed, so miniaturization of the antenna assembly 100 becomes an urgent problem to be solved.

[0056] In the embodiment of the present application, by reducing the length of the second radiator 30 to 1 / 2-1 / 3 of the original length, the antenna component 100 is excited to generate a resonant current that passes through the grounding point E and goes to the ground, and an inductor element L is set on the path from the grounding point E to the ground. The inductor element L can compensate for the reduction in electrical length caused by the shortening of the second radiator 30, so that the electrical lengths of the first resonant current and the second resonant current both meet the 1 / 4 wavelength of the required supported frequency band, thereby ensuring that a first resonant mode supporting the first frequency band is formed on the antenna component 100, realizing the miniaturization of the antenna component 100 while also ensuring that the antenna component 100 can support the first frequency band.

[0057] The present application does not limit the first frequency band. Optionally, the first frequency band includes but is not limited to at least one of the LB frequency band (less than 1 GHz), the MHB frequency band (1-3 GHz), the UHB frequency band (greater than 3 GHz), the Wi-Fi frequency band, the GPS frequency band, etc.

[0058] The antenna assembly 100 and the electronic device 1000 provided in the present application are designed such that the first radiator 10 includes a first end A, a feeding point B and a second end C, the signal source 20 is electrically connected to the feeding point B, the signal source 20 is used to provide an excitation signal, the second radiator 30 is parallel and oppositely arranged to the first radiator 10, a coupling gap is formed between the second radiator 30 and the first radiator 10, the first radiator 10 and the second radiator 30 are offset parallel coupled, the second radiator 30 includes a third end D, a grounding point E and a fourth end F which are arranged in sequence, the grounding point E is grounded through an inductor element L, the inductor element L is used to increase the electrical length of the second radiator 30, the second radiator 30 forms a first resonant mode supporting a first frequency band under the excitation of the signal source 20, and the resonant current of the first resonant mode includes The first resonant current flows from the third end D to the grounding point E and goes to the ground through the grounding point E, and the second resonant current flows from the fourth end F to the grounding point E and goes to the ground through the grounding point E. The mode of the first resonant current and the mode of the second resonant current are both 1 / 4 wavelength modes of the first frequency band. The length of the second radiator 30 is (1 / 6-1 / 4) wavelength of the first frequency band. Through the above design, when the length of the second radiator 30 is shortened to 1 / 2-1 / 3 of the original length, it can also have sufficient electrical length to generate a 1 / 4 wavelength current flowing from the third end D to the grounding point E and going to the ground through the grounding point E, and a 1 / 4 wavelength current flowing from the fourth end F to the grounding point E and going to the ground through the grounding point E, thereby generating a first resonant mode supporting the first frequency band, so as to reduce the size of the antenna component 100 and save the space occupied.

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

[0060] In the first resonance mode, the first radiator 10 and the signal source 20 are equivalent to the excitation source of the second radiator 30, and through coupling excitation, the second radiator 30 is excited to generate the above-mentioned first resonance mode, forming the above-mentioned first resonance current and second resonance current distribution.

[0061] In addition, a first distributed current is also formed on the first radiator 10. When the third end D to the ground point E on the first radiator 10 and the second radiator 30 are opposite, the current direction of the first distributed current is the same as the direction of the first resonant current. And the intensity of the first resonant current is much greater than the current direction of the first distributed current.

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

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

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

[0065] See also Figure 6 , the resonant current of the second resonant mode includes a second resonant current flowing from the third end D to the fourth end F. Of course, due to the periodicity of the current, the direction of the resonant current of the second resonant mode may also be opposite to the above current direction.

[0066] The mode of the second resonant current is a 1 / 2 wavelength mode of the second frequency band. In other words, the electrical length between the third end D and the fourth end F is approximately 1 / 2 wavelength of the second frequency band. The center frequency of the second frequency band is greater than the center frequency of the first frequency band.

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

[0068] For the first resonant mode and the second resonant mode, the antenna assembly 100 is similar to a T-shaped antenna, wherein the feeding method is coupled feeding. The first radiator 10 and the signal source 20 are equivalent to the exciter.

[0069] Among them, the first resonant mode is the high mode radiating mode of the T-shaped antenna, and the second resonant mode is the high mode balanced mode of the T-shaped antenna. Generally, after the antenna component 100 generates the high mode radiating mode and the high mode balanced mode, there will be a greater improvement in efficiency, thereby improving the radiation efficiency (wave boost) within the antenna band. Therefore, the generation of the second resonant mode can effectively improve the efficiency of the first frequency band supported by the first resonant mode to compensate for the efficiency problem caused by the electrical length compensation of the inductor element L, so that the antenna component 100 can achieve low-frequency miniaturization while also improving the efficiency of the LB frequency band.

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

[0071] In a general mouth-to-mouth antenna, for example, in an antenna component 100 in which a coupling gap is formed between the second end C of the first radiator 10 and the third end D of the second radiator 30. Since the grounding point E is grounded through the inductor element L with a large inductance, the overall input impedance of the antenna is increased. As the frequency increases, the impedance increases. Therefore, the antenna component 100 cannot generate the second resonant mode in the present application, and therefore cannot achieve the effect of improving the efficiency of the second resonant mode for the first frequency band. In the present application, by using the first radiator 10 and the signal source 20 as the excitation source, and coupling the first radiator 10 and the second radiator 30 in parallel and offset, the coupling amount between the first radiator 10 and the second radiator 30 is increased compared to the mouth-to-mouth antenna, thereby promoting the signal source 20 in the present application to excite the first resonant mode and the second resonant mode.

[0072] The difference between the resonant current of the second resonant mode and the resonant current of the first resonant mode includes: the resonant current of the first resonant mode goes to ground through the inductor element L, while the resonant current of the second resonant mode does not go to ground through the inductor element L. Therefore, the inductor element L does not affect the resonant current of the second resonant mode.

[0073] In addition, a second distributed current is also formed on the first radiator 10. When the third end D to the ground point E on the first radiator 10 and the second radiator 30 are opposite, the current direction of the second distributed current is the same as the direction of the resonant current between the third end D and the ground point E. And the intensity of the resonant current between the third end D and the ground point E is much greater than the current direction of the second distributed current.

[0074] In other words, the second resonance mode is mainly a 1 / 2 wavelength mode from the third end D to the fourth end F, accompanied by a weaker current from the first end A to the second end C of the first radiator 10 .

[0075] The present application does not specifically limit the positional relationship between the first radiator 10 and the second radiator 30 . The positional relationship between the first radiator 10 and the second radiator 30 is exemplified below with reference to the accompanying drawings.

[0076] See also Figure 7 and Figure 8, the orthographic projection of the second end C in the target direction is located between the third end D and the grounding point E. The orthographic projection of the first end A in the target direction is located between the third end D and the grounding point E, or the orthographic projection of the first end A in the target direction is located on the side of the third end D away from the grounding point E. The target direction is perpendicular to the extension direction of the second radiator 30. In other words, the first radiator 10 can be completely opposite to the second radiator 30, and the first radiator 10 can also be partially opposite to the second radiator 30, both of which can ensure that the coupling amount between the first radiator 10 and the second radiator 30 is large, so as to excite a higher frequency mode, such as the second resonant mode or a resonant mode in a higher frequency band. When the first radiator 10 is completely opposite to the second radiator 30, the length of the first radiator 10 and the second radiator 30 in the extension direction is also shortened, thereby realizing the miniaturization of the antenna assembly 100.

[0077] Optional, see Figure 8 , the length of the first radiator 10 directly facing the second radiator 30 is greater than or equal to 1 / 2 of the total length of the first radiator 10. When the length of the first radiator 10 directly facing the second radiator 30 is less than 1 / 2 of the total length of the first radiator 10, the coupling amount between the first radiator 10 and the second radiator 30 is too small, and a higher frequency mode and a resonance mode in a higher frequency band cannot be excited.

[0078] For further information, see Figure 8 The first radiator 10 and the second radiator 30 also jointly form a third resonance mode supporting a third frequency band under the excitation of the signal source 20.

[0079] The third resonance mode is different from the first resonance mode and the second resonance mode in that in the third resonance mode, both the first radiator 10 and the second radiator 30 participate in the transmission and reception of electromagnetic waves, and in the first resonance mode and the second resonance mode, the first radiator 10 is equivalent to a feeding structure, and the second radiator 30 participates in the transmission and reception of electromagnetic waves. Therefore, the third resonance mode generates resonance currents on both the first radiator 10 and the second radiator 30.

[0080] The position of the feeding point B on the first radiator 10 changes the current distribution on the first radiator 10 and the current distribution on the second radiator 30 , and changes the resonance frequency of the third resonance mode.

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

[0082] The second end C is closer to the ground point E than the first end A. In other words, along the extension direction of the first radiator 10, the first end A, the second end C and the ground point E are sequentially arranged. For example, the first end A is located near the third end D. In other words, the first radiator 10 is substantially entirely opposite to the second radiator 30.

[0083] The feeding point B is spaced apart from the second end C. The resonant current of the third resonant mode includes a fourth resonant current located on the first radiator 10 and a fifth resonant current located on the second radiator 30. The mode of the fourth resonant current is a 1 / 4 wavelength mode of the third frequency band. The fourth resonant current is a current from the feeding point B to the second end C. In this way, the fourth resonant current forms a first current zero point Q1 at the second end C. The current zero point is the weakest point of the current and the point of electric field strength.

[0084] See also Fig. 9 , the mode of the fifth resonant current is the 3 / 4 wavelength mode of the third frequency band. The second current zero point Q2 of the fifth resonant current on the second radiator 30 is directly opposite to the second end C. That is, the current zero point on the second radiator 30 is directly opposite to the current zero point on the first radiator 10 and is disconnected, and the current zero point position is a basically current-free position, even if the current distribution of the first radiator 10 and the second radiator 30 when the current zero point is disconnected can be equivalent to the current distribution when the current zero point of the first radiator 10 and the current zero point of the second radiator 30 are connected.

[0085] See also Fig. 9 , the fifth resonant current includes a first sub-current flowing from the first end A to the second current zero point Q2 and a second sub-current flowing from the second end C to the second current zero point Q2. The mode of the first sub-current is the 1 / 4 wavelength mode of the third frequency band. The mode of the second sub-current is the 1 / 2 wavelength mode of the third frequency band. The current direction of the first sub-current is the same as the current direction of the fourth resonant current. The direction of the first sub-current is opposite to the direction of the second sub-current. Since the disconnection position of the first radiator 10 and the second radiator 30 is the current zero point in the above-mentioned design and the generated third resonant mode, it can be regarded as the second end C of the first radiator 10 and the position where the second current zero point Q2 of the second radiator 30 is connected, and the current intensity of the first sub-current changes with the change of the intensity of the fourth resonant current. The current path of the first sub-current changes with the change of the current path of the fourth resonant current. Specifically, the current direction, path, and intensity distribution of the first sub-current and the fourth resonant current will change synchronously.

[0086] In an alternative embodiment, see Fig. 9, the feeding point B is located at the first end A, and the first current zero point Q1 is located at the second end C. In the third resonant mode, the first radiator 10 generates a fourth resonant current under the excitation of the signal source 20, and the current mode of the fourth resonant current is a 1 / 4 wavelength mode of the third frequency band. In this way, the entire first radiator 10 can be used to form a path for the current in the 1 / 4 wavelength mode.

[0087] The length between the first end A and the second end C is approximately 1 / 4 wavelength of the third frequency band. The resonant current flows from the feeding point B to the second end C. At this time, the second end C is a current zero point.

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

[0089] In this embodiment, the resonant current of the third resonant mode has at least one second current zero point Q2 on the second radiator 30. At least one first current zero point Q1 is directly opposite to the second current zero point Q2.

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

[0091] In the third resonance mode, although the first radiator 10 and the second radiator 30 are disconnected, the disconnection position of the first radiator 10 and the second radiator 30 is the current zero point, that is, the first current zero point Q1 position (second end C) on the first radiator 10 and the second current zero point Q2 position (first dividing point H) on the second radiator 30 are disconnected. Since there is basically no current at the current zero point position and it is a point of electric field strength, it can be regarded as the second end C of the first radiator 10 and the first dividing point H on the second radiator 30 are connected. In this way, the 3 / 4 wavelength mode of the third resonance mode can be equivalent to the 1 / 4 wavelength mode from the first end A to the second end C and the 1 / 2 wavelength mode from the first dividing point H to the fourth end F.

[0092] In other words, since the second end C of the first radiator 10 far from the feeding point B is a position disconnected from the second radiator 30. If the second end C of the first radiator 10 far from the feeding point B is a current zero point, disconnection at the current zero point position has little effect on current distribution. The current distribution effect is similar to the second end C of the first radiator 10 being connected to the directly opposite position on the second radiator 30.

[0093] In another embodiment, the feeding point B is located between the first end A and the second end C, and the electrical length of the current in the 1 / 4 wavelength mode on the first radiator 10 is shortened. At this time, the electrical length of the current in the 3 / 4 wavelength mode in the third resonance mode is shortened, and the center frequency of the third resonance mode shifts toward high frequency. As the position of the feeding point B approaches the second end C, the center frequency of the third resonance mode shifts toward high frequency.

[0094] In another embodiment, the feeding point B may be located at the second end C, the feeding point B is spaced apart from the first end A, and the fourth resonant current flows from the feeding point B to the first end A. The fifth resonant current of the third resonant mode on the second radiator 30 flows from the fourth end F to the third end D, and is a 1 / 2 wavelength mode. In this way, the first end A is the first current zero point Q1, and the fourth end F is the second current zero point Q2. The first current zero point Q1 of the first radiator 10 is directly opposite to the second current zero point Q2 and is disconnected, which can be equivalent to the first current zero point Q1 and the second current zero point Q2 being connected at the position.

[0095] The present application does not make any specific limitation on the third frequency band. Optionally, the third frequency band includes but is not limited to at least one of a UHB frequency band (greater than 3 GHz), a Wi-Fi frequency band, and the like.

[0096] Furthermore, the third frequency band is greater than or equal to 3.5 GHz. When the third frequency band is greater than or equal to 3.5 GHz, the coupling gap between the first radiator 10 and the second radiator 30 is equivalent to a large capacitor, and then the first radiator 10 and the second radiator 30 are electrically conductive, so that the current on the first radiator 10 and the current of the part of the second radiator 30 facing the first radiator 10 are in the same direction and have the same intensity. The current of the part of the second radiator 30 facing the first radiator 10 will also change with the change of the current on the first radiator 10. In this embodiment, the third frequency band is taken as the UHB band as an example. In this way, the antenna assembly 100 can simultaneously cover the LB band + Wi-Fi-2.4G band / N41 band + UHB band.

[0097] In this embodiment, the third frequency band is a high frequency band. The inductor element L is disconnected for the third frequency band. Therefore, the fifth resonant current of the third resonant mode on the second radiator 30 does not pass through the inductor element L to the ground.

[0098] The present application does not specifically limit the length of the first radiator 10. Optionally, the length of the first radiator 10 directly opposite to the second radiator 30 is 1 / 3-1 / 4 of the total length of the second radiator 30, so as to excite the fourth resonant current of the 1 / 4 wavelength mode on the first radiator 10 and the fifth resonant current of the 3 / 4 wavelength mode on the second radiator 30.

[0099] For further information, see Fig.10 The first radiator 10 and the second radiator 30 also jointly form a fourth resonance mode supporting a fourth frequency band under the excitation of the signal source 20.

[0100] The resonant current of the fourth resonant mode on the second radiator 30 includes a sixth resonant current flowing from the third end D to the second demarcation point J on the second radiator 30 and a seventh resonant current flowing from the fourth end F to the second demarcation point J. Due to the periodicity of the current, the above current directions can all be reversed.

[0101] The present application does not make any specific limitation on the position of the second dividing point J. Optionally, the second dividing point J may be located at the grounding point E, or be spaced apart from the grounding point E.

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

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

[0104] The mode of the sixth resonant current is the 1 / 2 wavelength mode of the fourth frequency band. The mode of the seventh resonant current is the 1 / 2 wavelength mode of the fourth frequency band. The electrical length from the third end D to the fourth end F is approximately the entire wavelength of the fourth frequency band.

[0105] The first radiator 10 is arranged parallel to and opposite to the portion between the first end A and the ground point E. The first radiator 10 forms an eighth resonance current under the fourth resonance mode. The mode of the eighth resonance current is a 1 / 4 wavelength mode of the fourth frequency band.

[0106] The first radiator 10 couples the third end D with the ground point E to form the sixth resonant current, and couples the ground point E with the fourth end F to form the seventh resonant current. The direction of the eighth resonant current is opposite to that of the sixth resonant current.

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

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

[0109] Optional, see Figure 4 The antenna assembly 100 further includes a matching circuit M1. The matching circuit M1 is electrically connected between the signal source 20 and the feeding point B. The matching circuit M1 includes at least one of a capacitor and an inductor. The matching circuit M1 helps the signal source 20 to excite a first resonant mode on the first radiator 10 by adjusting the impedance matching between the port of the signal source 20 and the port of the first radiator 10.

[0110] Specifically, the matching circuit M1 includes but is not limited to a capacitor, or an inductor, a series device of a capacitor and an inductor, a parallel device of a capacitor and an inductor, the above series device in parallel with a capacitor, the above series device in parallel with an inductor, two of the above series devices in parallel, two of the above parallel devices in series, and so on.

[0111] Optional, see Fig.11 , the tuning circuit 40 also includes a switch unit K and a plurality of tuning branches T, one end of the inductor element L is electrically connected to the grounding point E, the switch unit K is electrically connected to an end of the inductor element L away from the grounding point, and the other end of the switch unit K can be selectively electrically connected to at least one of the plurality of tuning branches T, and each of the tuning branches T is grounded. The tuning circuit 40 is used to switch the sub-bands of the first frequency band. For example, the tuning circuit 40 is used to switch the antenna assembly 100 between sub-bands such as B5, B8, B20, and B28. Since the resonant current of the second resonant mode supporting the second frequency band does not pass through the tuning circuit 40 to the ground, the second frequency band remains resident when the sub-bands of the first frequency band are switched.

[0112] Of course, the tuning circuit 40 may not include an inductor, but may include a switch unit K and a plurality of tuning branches T, some or all of which can compensate for the electrical length, thereby compensating for the reduction in the electrical length of the second radiator 20 .

[0113] In addition, the resonant current of the third resonant mode supporting the third frequency band does not pass through the tuning circuit 40 to the ground, so the third frequency band remains resident when the sub-band of the first frequency band is switched. The resonant current of the fourth resonant mode supporting the fourth frequency band does not pass through the tuning circuit 40 to the ground, so the fourth frequency band remains resident when the sub-band of the first frequency band is switched.

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

[0115] Optional, see Fig.11 , the fixed end of the switch unit K is electrically connected to one end of the inductor element L away from the grounding point E, the impedance of each of the tuning branches T is different, and one end of each of the tuning branches T is electrically connected to the selection end of the switch unit K. The other end of each of the tuning branches T is electrically connected to the reference ground. The switch unit K is a switch tube, including but not limited to at least one of a triode, a transistor, a field effect tube, etc. The tuning branch T can be an inductor, a capacitor, etc. with different impedance values. When the switch unit K switches to a different tuning branch T, the tuning branch T has a different impedance, that is, a different equivalent electrical length, so that the electrical length of the current path can be changed, thereby switching the sub-band of the first frequency band supported by the first resonant mode. When the first frequency band is low frequency, low frequency switchability is achieved.

[0116] The present application does not limit the specific location of the antenna assembly 100 .

[0117] See also Fig.12 , the electronic device 1000 further includes a reference floor 50. The reference floor 50 is disposed in the frame 320. The reference floor 50 has a corner point corresponding to the corner of the frame 320. The distance between the position where the grounding point E of the second radiator 30 is electrically connected to the reference floor 50 and the corner point of the reference floor 50 is less than 1 / 8 wavelength of the first frequency band.

[0118] The position where the grounding point E of the second radiator 30 is electrically connected to the reference floor 50 is the return position. Taking the LB frequency band as an example, the distance between the position where the grounding point E of the second radiator 30 is electrically connected to the reference floor 50 and the corner point of the reference floor 50 is less than 1 / 8 wavelength corresponding to the LB frequency band.

[0119] Since the return position of the grounding point E of the second radiator 30 is located near the corner of the reference floor 50, under the excitation of the signal source 2030, a floor current is formed on the reference floor 50, and the floor current flows from a distance to the grounding point E of the second radiator 30 and converges at the grounding point E of the second radiator 30, and flows to the second radiator 30 through the grounding point E of the second radiator 30. Since the antenna assembly 100 is returned to the ground near the corner of the reference floor 50, when the reference floor 50 participates in radiation, a transverse current along the transverse edge and a longitudinal current along the longitudinal edge are generated on the reference floor 50, and the directions of the transverse current and the longitudinal current are both toward the corner, and since the transverse current intersects with the longitudinal current, and is even close to perpendicular, there is little mutual cancellation between the transverse current and the longitudinal current.

[0120] If the return position of the grounding point E of the second radiator 30 is set at a position far away from the corner point along the longitudinal edge, a reverse current will be generated along the longitudinal edge, and the far-field energy of this reverse current can offset each other, thereby reducing its radiation efficiency.

[0121] Specifically, the length of the horizontal side is less than the length of the vertical side. When the antenna assembly 100 is grounded at the corner point of the reference floor 50, the maximum angle between the floor currents on the reference floor 50 is about 90°. That is, the horizontal current along the horizontal side and the vertical current along the vertical side are currents with the maximum angle, and no reverse current is generated, thereby improving the contribution efficiency of the reference floor 50, and thus improving the radiation efficiency of the antenna assembly 100.

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

[0123] See also Fig.13 The following is an example in which the antenna assembly 100 is arranged at a non-edge position of the second side of the frame 320, the feeding point B is located at the first end A of the first radiator 10, the first end A of the first radiator 10 is close to the third end D of the second radiator 30, the second end C of the first radiator 10 is close to the grounding point E of the second radiator 30, and the signal source 20 is electrically connected to the first end A through the matching circuit M1.

[0124] The first radiator 10 and the signal source 20 are excitation units, which serve as spatial exciters for the T-shaped second radiator 30. The first radiator 10 and the second radiator 30 are staggered with each other, and adopt a staggered coupling method. The difference between the antenna assembly 100 provided in the embodiment of the present application and the traditional mouth-to-mouth antenna is that the first radiator 10 and the second radiator 30 are partially staggered and parallel to each other, so that the first radiator 10 can better excite the second radiator 30 in a spatial coupling manner to produce more resonant modes and achieve mode compensation. At this time, the excitation method of the second radiator 30 comes from the path of: signal source 20-matching circuit M1-first radiator 10-free space-second radiator 30, and the excitation of the second radiator 30 is achieved through space, that is, the signal source 20 is not directly connected to the inductor element L for feeding.

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

[0126] The second resonance mode is mainly a 1 / 2 wavelength mode from the third end D to the fourth end F, accompanied by a weaker current from the first end A to the second end C.

[0127] After shortening the second radiator 30, an inductor element L is set at the grounding point E to compensate the electrical length of the second radiator 30. Under direct feeding, the second resonance mode cannot be excited. In this embodiment, after the direct feeding is changed to capacitor feeding, the second resonance mode, the third resonance mode and the fourth resonance mode can be excited. Among them, the formation of the second resonance mode can improve the in-band efficiency of the first resonance mode and the second resonance mode.

[0128] The third resonant mode is mainly a three-quarter wavelength mode from the first end A to the second end C and from the third end D to the fourth end F. Since the first radiator 10 and the second radiator 30 are staggered coupled, and the first radiator 10 and the second radiator 30 are close (for example, 1-2 mm). When the frequency is higher (for example, greater than 3.5 GHz), it can be regarded as adding a large capacitor between the first radiator 10 and the second radiator 30. Therefore, the current from the first end A to the second end C and the current from the third end D to the ground end are the same current. In other words, to put it simply, the current of the third resonant mode is the three-quarter wavelength mode current from the first end A to the fourth end F.

[0129] The fourth resonant mode is mainly a quarter mode current from the first end A to the second end C and a full wavelength mode current from the third end D to the fourth end F. First, under the excitation of the signal source 20, a strong current in a 1 / 4 wavelength mode is generated from the first end A to the second end C, and the strong current in the 1 / 4 wavelength mode excites a leftward 1 / 2 wavelength current from the third end D to the fourth end F, and then the leftward 1 / 2 wavelength current generates a rightward 1 / 2 wavelength current distribution.

[0130] It can be seen that in the embodiment of the present application, not only the radiation mode and the balanced mode of the T-shaped antenna are excited, but also the third resonant mode, i.e., the three-quarter mode from the first end A to the fourth end F, is additionally excited due to the new mode introduced by the increase in frequency and the change in boundary conditions.

[0131] If the first radiator 10 and the second radiator 30 are end-to-end coupled to form a mouth-to-mouth antenna, when the inductor element L is grounded with a large inductance, the large inductance makes the overall impedance of the second radiator 30 too large, and the signal source 20 cannot excite the second radiator 30 with a large overall impedance.

[0132] In the antenna assembly 100 provided in the embodiment of the present application, since the misaligned coupling between the first radiator 10 and the second radiator 30 greatly increases the coupling amount, the second radiator 30 can be fully excited to generate the first resonant mode and the second resonant mode. The resonant frequency (LB) of the first resonant mode and the resonant frequency (Wi-Fi 2.4G) of the second resonant mode are both located at a lower frequency sub3G. At this time, the signal source 20 and the first radiator 10 are mainly used as excitation sources to fully excite the mode currents of the first resonant mode and the second resonant mode on the second radiator 30. Since the current of the first resonant mode needs to be grounded through the inductor element L, the first resonant mode can be adjusted by the inductor element L on the second radiator 30 to compensate for the electrical length missing from the shorter second radiator 30, covering LB, that is, miniaturization of LB is achieved. At the same time, since the currents in the second resonance mode, the third resonance mode, and the third resonance mode do not go to the ground from the inductor element L, there is no effect on the current frequencies in the second resonance mode, the third resonance mode, and the third resonance mode. At this time, if a tuning circuit 40 is provided at one end of the inductor element L away from the grounding point E, the frequency band switching of LB can also be achieved.

[0133] As the frequency of the third resonant mode and the fourth resonant mode increases, the impedance between the two offset-coupled radiators is equivalent to a larger capacitor for high frequencies (greater than or equal to 3.5 GHz), and the first radiator 10 is conductively connected to the second radiator 30, so the first radiator 10 also acts as a radiating antenna. The first radiator 10 and the second radiator 30 radiate outward together as radiation sources, forming a third resonant mode, i.e., the whole branch three-quarter mode. Similarly, the first radiator 10 and the second radiator 30 form a fourth resonant mode, i.e., the whole branch one-wavelength mode.

[0134] See also Fig.14 , Fig.14 : is the S parameter curve and efficiency curve of the antenna assembly 100 provided in the embodiment of the present application. Fig.14 Curve a is an S parameter curve, curve b is a radiation efficiency curve, and curve c is a total efficiency curve. It can be seen from curve a that the antenna assembly 100 generates four resonance modes before 6 GHz, and these resonance modes are the first resonance mode with a resonance frequency at point 1 (0.75 GHz), the second resonance mode with a resonance frequency at point 2 (2.39 GHz), the third resonance mode with a resonance frequency at point 3 (4.3 GHz), and the fourth resonance mode with a resonance frequency at point 4 (5.8 GHz).

[0135] It can be seen from the total efficiency curve that the efficiency of the LB frequency band supported by the first resonance mode is -6.5 dB, which means that the miniaturized LB antenna in the present application still has the same efficiency as the LB antenna of normal length.

[0136] See also Fig.15 , Fig.15 It is a comparison diagram of the S parameter curve of the miniaturized LB antenna with offset coupling feed and the S parameter curve of the T-shaped direct-fed antenna provided in the embodiment of the present application. Curve a is the S parameter curve of the miniaturized LB antenna provided in the embodiment of the present application. Curve b is the S parameter curve of the T-shaped direct-fed antenna. By comparing curve a with curve b, it can be seen that the T-shaped direct-fed antenna cannot excite a relatively high-frequency resonant mode.

[0137] See also Fig.16 , Fig.16 1 is a comparison diagram of the efficiency curve of the miniaturized LB antenna with staggered coupling feed and the efficiency curve of the T-shaped direct-fed antenna provided in the embodiment of the present application. Curve a is the radiation efficiency curve of the miniaturized LB antenna with staggered coupling feed provided in the embodiment of the present application. Curve b is the radiation efficiency curve of the T-shaped direct-fed antenna. Curve c is the total efficiency curve of the miniaturized LB antenna with staggered coupling feed provided in the embodiment of the present application. Curve d is the total efficiency curve of the T-shaped direct-fed antenna.

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

[0139] See also Fig.17 , Fig.17 It is the S parameter curve of the antenna assembly 100 provided in the embodiment of the present application when the tuning circuit 40 switches the LB sub-band. Curves a, b, and c are the S parameters of the antenna assembly 100 when the tuning circuit 40 switches the LB sub-band from B28, B5, and B8, respectively. It can be seen from curves a, b, and c that when the LB sub-band switches from B28, B5, and B8, Wi-Fi 2.4G, UHB, and Wi-Fi 5G are still in the permanent state. This is because the resonant currents of the second resonant mode, the third resonant mode, and the fourth resonant mode do not pass through the tuning circuit 40.

[0140] The antenna assembly 100 provided in the embodiment of the present application can not only realize the miniaturization of the high-performance side LB antenna, but also, in order to compensate for the mode loss after miniaturization, it adopts the missing half-wavelength and full-wavelength modes by staggered spatial coupling excitation. Moreover, due to the change of boundary conditions, an additional three-quarter wavelength mode is added to achieve simultaneous coverage of LB+Wi-Fi 2.4G+UHB+Wi-Fi5G frequency bands.

[0141] Although the embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

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

2. The antenna assembly according to claim 1, wherein: The second radiator also forms a second resonance mode supporting the second frequency band under the excitation of the signal source, and the resonance current of the second resonance mode includes a third resonance current flowing from the third end to the fourth end; the mode of the third resonance current is a 1 / 2 wavelength mode of the second frequency band.

3. The antenna assembly according to claim 1, wherein: The first radiator and the second radiator also jointly form a third resonance mode supporting a third frequency band under the excitation of the signal source, and the resonance current of the third resonance mode has at least one first current zero point on the first radiator, and the first current zero point is located at the end spaced apart from the feeding point; the resonance current of the third resonance mode has at least one second current zero point on the second radiator, and at least one of the first current zero points is directly opposite to the second current zero point.

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

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

6. The antenna assembly according to claim 4, wherein: The feeding point is located at the first end.

7. The antenna assembly according to claim 4, characterized in that: The length of the first radiator directly facing the second radiator is 1 / 3-1 / 4 of the total length of the second radiator.

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

9. The antenna assembly according to claim 1, wherein: The first radiator and the second radiator also jointly form a fourth resonance mode supporting a fourth frequency band under the excitation of the signal source. The resonance current of the fourth resonance mode on the second radiator includes a sixth resonance current flowing from the third end to the dividing point on the second radiator and a seventh resonance current flowing from the fourth end to the dividing point. The mode of the sixth resonance current is a 1 / 2 wavelength mode of the fourth frequency band, and the mode of the seventh resonance current is a 1 / 2 wavelength mode of the fourth frequency band.

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

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

12. The antenna assembly according to claim 11, wherein: The length of the first radiator directly facing the second radiator is greater than or equal to 1 / 2 of the total length of the first radiator.

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

14. The antenna assembly according to claim 2, wherein: The tuning circuit includes an inductor element, a switch unit and a plurality of tuning branches, one end of the inductor element is electrically connected to the ground point, and the inductor element is used to increase the electrical length of the second radiator; the switch unit is electrically connected to an end of the inductor element away from the ground point, and the other end of the switch unit can be selectively electrically connected to at least one of the plurality of tuning branches, each of the tuning branches is grounded, and the tuning circuit is also used to switch the sub-band of the first frequency band, and the second frequency band remains resident when the sub-band of the first frequency band is switched.

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

16. The electronic device according to claim 15, characterized in that: The electronic device also includes a frame, which includes a top edge, a bottom edge, and a first side edge and a second side edge connected between the top edge and the bottom edge. The antenna assembly is arranged on the first side edge or the second side edge.

17. The electronic device according to claim 15, characterized in that: The electronic device also includes a frame and a reference floor, wherein the reference floor is arranged in the frame, and the reference floor has a corner point corresponding to the corner of the frame, and the distance between the position where the grounding point of the second radiator is electrically connected to the reference floor and the corner point of the reference floor is less than 1 / 8 wavelength of the first frequency band.

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