Electronic device

Abstract

The electronic device provided by the application includes a radiator, the radiator includes a first radiation section and a second radiation section, the first radiation section includes a first free end and a first ground end arranged oppositely, the second radiation section includes a second free end and a second ground end arranged oppositely, an insulating gap is arranged between the first free end and the second free end, and positions of the first ground end and the second ground end electrically connected to a reference ground plate are located in a target excitation area; a signal end of a signal source is electrically connected to the first radiation section, a ground end of the signal source is electrically connected to the second radiation section, the signal source is used for exciting a loop current formed on the first radiation section, the target excitation area of the reference ground plate and the second radiation section, the loop current is used for exciting a target resonance mode supporting a target frequency band formed on the reference ground plate, and a resonance current of the target resonance mode is mainly distributed along a first reference ground edge. The electronic device provided by the application can improve the antenna performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to an electronic device. BACKGROUND

[0002] With the increasing communication demand of electronic devices, how to improve the antenna performance of electronic devices on electronic devices becomes a problem to be solved. SUMMARY

[0003] The present application provides an electronic device for improving antenna performance.

[0004] The electronic device provided by the present application comprises:

[0005] The reference floor comprises the first reference floor edge, the third reference floor edge, the second reference floor edge and the fourth reference floor edge connected in sequence, and the length of the first reference floor edge is greater than the length of the third reference floor edge.

[0006] The radiator comprises a first radiation section and a second radiation section, the first radiation section and the second radiation section are arranged along the first reference floor edge, the first radiation section and the second radiation section are arranged in a spaced manner with the first reference floor edge, the first radiation section comprises a first free end and a first ground end arranged oppositely, the second radiation section comprises a second free end and a second ground end arranged oppositely, the first free end and the second free end are insulated from each other, and the first ground end and the second ground end are electrically connected to the current strong area of the characteristic mode current of the reference floor.

[0007] The signal source is electrically connected to the first radiation section, the ground end of the signal source is electrically connected to the second radiation section, the signal source is used to excite the first radiation section, the target excitation area of the reference floor and the second radiation section to form a ring current, and the ring current excites the target resonance mode of the target frequency band on the reference floor, and the resonance current of the target resonance mode is mainly distributed along the first reference floor edge.

[0008] The electronic device provided by the embodiment of the application is characterized in that the free ends of the first radiation section and the second radiation section are opposite to each other, the first radiation section and the second radiation section are electrically connected to the target excitation area of the reference floor, the signal end of the signal source is electrically connected to the first radiation section, the grounding end of the signal source is electrically connected to the second radiation section, and the signal source, the first radiation section, the reference floor and the second radiation section form a current loop. In this way, the signal source is used to excite the annular current formed on the first radiation section, the reference floor and the second radiation section, and the annular current excites the target resonance mode supporting the target frequency band formed on the reference floor. The resonance current of the target resonance mode is mainly distributed along the first reference floor edge, that is, the signal source and the radiator are used as a radiation driver to excite the resonance current (for example, the longitudinal current distribution) supporting the target frequency band and along the first reference floor edge formed on the reference floor, so as to improve the working efficiency of the target frequency band and improve the antenna performance. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced below.

[0010] Figure 1 FIG. 1 is a structural schematic diagram of an electronic device provided by an embodiment of the application;

[0011] Figure 2 FIG. 2 is a partial structural schematic diagram of an electronic device provided by an embodiment of the application;

[0012] Figure 3 FIG. 3 is a partial back view of an electronic device provided by an embodiment of the application;

[0013] Figure 4 FIG. 4 is a structural schematic diagram of an electronic device provided by an embodiment of the application;

[0014] Figure 5 FIG. 5 is a schematic diagram of an electronic device provided by an embodiment of the application forming an annular current;

[0015] Figure 6 FIG. 6 is a schematic diagram of an electronic device provided by an embodiment of the application forming a resonance current on a reference floor;

[0016] Figure 7 FIG. 7 is a schematic diagram of a resonance current of a 1 / 2 wavelength mode formed on a reference floor provided by an embodiment of the application;

[0017] Figure 8 FIG. 8 is a schematic diagram of a resonance current of a wavelength less than 1 / 2 wavelength mode formed on a reference floor provided by an embodiment of the application;

[0018] Figure 9 FIG. 9 is a schematic diagram of a resonance current of a wavelength greater than 1 / 2 wavelength mode formed on a reference floor provided by an embodiment of the application;

[0019] Figures 10a-10d is a schematic diagram of a gradually increasing width of an antenna element of a reference floor equivalent to a dipole antenna provided by an embodiment of the present application;

[0020] Figure 11 is a characteristic current distribution diagram in which a longitudinal current mode accounts for the largest proportion on a reference floor provided by an embodiment of the present application;

[0021] Figure 12 is a schematic diagram of a physical structure of an inductive coupling element provided by an embodiment of the present application;

[0022] Figure 13 is an equivalent diagram of an inductive coupling element provided by an embodiment of the present application, in which the inductive coupling element is arranged on a reference floor;

[0023] Figure 14 is a schematic diagram of a structure of a matching circuit provided by an embodiment of the present application;

[0024] Figure 15 is a schematic diagram of a circuit distribution on an antenna circuit board provided by an embodiment of the present application;

[0025] Figure 16 is a schematic diagram of a structure in which an electronic device is arranged on a frame provided by an embodiment of the present application;

[0026] Figure 17 is a schematic diagram of a structure in which an electronic device is arranged on a frame provided by an embodiment of the present application; Figure 16 is a zoomed-in schematic diagram of a Z region in

[0027] Figure 18 is a zoomed-in schematic diagram of a Z region in Figure 16

[0028] Figure 19 is a schematic diagram of a setting mode of a support table and a circuit board on an electronic device provided by an embodiment of the present application;

[0029] Figure 20 is a schematic diagram of a setting mode of a conductive spring sheet on an electronic device provided by an embodiment of the present application;

[0030] Figure 21 is a schematic diagram of a setting mode of a support table and a battery on an electronic device provided by an embodiment of the present application;

[0031] Figure 22 is an S parameter curve when an electronic device switches in an LB frequency band in an electronic device provided by an embodiment of the present application;

[0032] Figure 23 is an efficiency curve when an electronic device switches in an LB frequency band in an electronic device provided by an embodiment of the present application.

[0033] Explanation of reference numerals: ​

[0034] Electronic device 1000; display screen 200; middle frame 300; back cover 400; middle plate 310; frame 320; circuit board 60; main plate 61; sub plate 62; reference ground plate 10; radiator 20; signal source 30; first reference ground edge 11; third reference ground edge 13; second reference ground edge 12; fourth reference ground edge 14; first current weak area 15; current strong area 16; second current weak area 17; top edge 321; first side edge 323; bottom edge 322; second side edge 324; first radiation section 21; second radiation section 22; first free end A; first ground end B; insulating gap 23; second free end C; second ground end D; signal end 31; ground end 32; matching circuit M; switch unit K; matching element L1; antenna circuit board 40; radio frequency connecting seat 41; reference ground layer 42; support table 24; conductive convex part 25; conductive spring 44; battery 70. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the embodiments described in the present application are only part of the embodiments, rather than all the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0036] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0037] The terms "first", "second", and the like in the specification and claims of the present application and the above drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example: an assembly or device including one or more components is not limited to the listed one or more components, but can optionally include one or more components not listed but inherent to the product exemplified, or one or more components that should be included based on the described function.

[0038] Please refer to Figure 1 , Figure 1A structural schematic diagram of an electronic device 1000 is provided in an embodiment of the present application. The electronic device 1000 includes, but is not limited to, a device with a communication function such as a mobile phone, a tablet computer, a notebook computer, a computer, a wearable device, a large-screen device, and the like. The embodiment of the present application takes the mobile phone as an example for illustration, and other electronic devices can refer to the embodiment.

[0039] Please refer to Figure 2 , Figure 2 is a partial exploded schematic diagram of the electronic device 1000. The electronic device 1000 includes the electronic device 1000, and the working environment of the electronic device 1000 is exemplified by taking the electronic device 1000 as a mobile phone. 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. The middle frame 300 includes a middle plate 310 and a bezel 320 surrounding the periphery of the middle plate 310. The bezel 320 can be a conductive bezel. Of course, in other embodiments, the electronic device 1000 can not have the middle plate 310. The display screen 200, the middle plate 310, and the back cover 400 are arranged 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 the circuit board 60 (main board 61 and auxiliary board 62), camera module, receiver module, battery, various sensors, and the like. One side of the bezel 320 surrounds the edge of the display screen 200, and the other side of the bezel 320 surrounds the edge of the back cover 400 to form the complete appearance structure of the electronic device 1000. In the embodiment, the bezel 320 and the middle plate 310 are an integral structure, and the bezel 320 and the back cover 400 can be a split structure. The above is the working environment of the electronic device 1000 taking the mobile phone as an example, but the electronic device 1000 of the present application is not limited to the above working environment.

[0040] Please refer to Figure 3 , Figure 3 is a back view of the electronic device 1000. The bezel 320 includes a top edge 321, a bottom edge 322, and a first side edge 323 and a second side edge 324 connected to the top edge 321 and the bottom edge 322. The top edge 321 is the edge away from the ground when the user holds the electronic device 1000 and uses it vertically. The bottom edge 322 is the edge towards the ground when the user holds the electronic device 1000 and uses it vertically. The first side edge 323 is the left side edge when the user holds the electronic device 1000 and uses it vertically. The second side edge 324 is the right side edge when the user holds the electronic device 1000 and uses it vertically. Of course, the first side edge 323 can also be the right side edge when the user holds the electronic device 1000 and uses it. The second side edge 324 is the left side edge when the user holds the electronic device 1000 and uses it.

[0041] Please refer to Figure 3 and Figure 4The electronic device 1000 comprises at least one antenna assembly 100, a reference ground plate 10. The antenna assembly 100 comprises a radiator 20 and a signal source 30.

[0042] Please refer to Figure 4 The reference ground plate 10 comprises the first reference ground edge 11, the third reference ground edge 13, the second reference ground edge 12 and the fourth reference ground edge 14 connected in sequence.

[0043] The first reference ground edge 11 is opposite to the second reference ground edge 12, and the third reference ground edge 13 is opposite to the fourth reference ground edge 14.

[0044] The length of the first reference ground edge 11 is greater than the length of the third reference ground edge 13. The first reference ground edge 11 and the second reference ground edge 12 are both long edges of the reference ground plate 10. The third reference ground edge 13 and the fourth reference ground edge 14 are both short edges of the reference ground plate 10.

[0045] Taking the reference ground plate 10 as an example, the reference ground edges of the reference ground plate 10 include but are not limited to straight edges or regular edges. Various slots, holes and the like are formed on the reference ground edges of the reference ground plate 10 according to the needs of setting devices or avoiding other structures in the mobile phone. The reference ground plate 10 includes but is not limited to a metal alloy part (such as an aluminum alloy) of the middle plate 310 and a reference ground metal part of the circuit board 60 (including the main board 61 and the auxiliary board 62). In general, the reference ground system in the electronic device 1000 can be equivalent to a general rectangle, so it is called the reference ground plate 10. The reference ground plate 10 does not indicate that the shape of the reference ground is a plate and is a rectangular plate. The outer contour of the reference ground plate 10 is close to the inner side of the frame 320.

[0046] Please refer to Figure 3 Taking the frame 320 as an example, the frame 320 comprises the top edge 321, the first side edge 323, the bottom edge 322 and the second side edge 324 connected in sequence. The top edge 321 and the bottom edge 322 are a pair of short edges, and the first side edge 323 and the second side edge 324 are a pair of long edges. The size of the long edges is greater than the size of the short edges.

[0047] Please refer to Figure 3 and Figure 4 The reference ground plate 10 is arranged in the frame 320. The first reference ground edge 11 is opposite to and spaced apart from the first side edge 323. The second reference ground edge 12 is opposite to and spaced apart from the second side edge 324. The third reference ground edge 13 is opposite to and spaced apart from the top edge 321. The fourth reference ground edge 14 is opposite to and spaced apart from the bottom edge 322.

[0048] Please refer toFigure 4 The radiator 20 includes a first radiation section 21 and a second radiation section 22. Optionally, the first radiation section 21 and the second radiation section 22 are made of electrically conductive materials, including but not limited to metals, alloys, and the like.

[0049] The present application does not limit the shape of the first radiation section 21 and the second radiation section 22. For example, the shape of the first radiation section 21 and the second radiation section 22 includes but is not limited to a strip, a sheet, a rod, a coating, a film, and the like. Figure 4 The shape of the first radiation section 21 and the second radiation section 22 shown is only an example and does not limit the shape of the first radiation section 21 and the second radiation section 22 provided by the present application. In the present embodiment, the first radiation section 21 and the second radiation section 22 are both in the shape of a strip. In the present embodiment, the first radiation section 21 extends in a straight line or the like. The first radiation section 21 described above can be a line with a uniform width, or a strip with a varying width, a widened area, and the like.

[0050] The present application does not limit the shape of the first radiation section 21 and the second radiation section 22. Optionally, the specific shape of the first radiation section 21 and the second radiation section 22 includes but is not limited to a metal frame 320, a metal frame inlaid in a plastic frame 320, a metal conductor in the frame 320 or on the surface of the frame 320, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct structuring (LDS) antenna formed by laser direct structuring, a print direct structuring (PDS) antenna formed by print direct structuring, a conductive sheet antenna (e.g., a metal bracket antenna), and the like. The present application takes the first radiation section 21 and the second radiation section 22 as an example, both of which are part of the frame 320.

[0051] Please refer to Figure 3 and Figure 4 The first radiation section 21 and the second radiation section 22 are both arranged along the first reference ground edge 11. That is, the radiator 20 is part of the first side edge 323. The first radiation section 21 and the second radiation section 22 are both arranged apart from the first reference ground edge 11. The present application does not limit the distance between the first radiation section 21 and the second radiation section 22 and the first reference ground edge 11, for example, 2 mm, 2.5 mm, 3 mm, and the like.

[0052] Please refer to Figure 4, the first radiation section 21 includes a first free end A and a first ground end B arranged oppositely. The first free end A is one end of the frame 320 after the insulating gap 23 is arranged on the frame 320. The insulating gap 23 is filled with insulating material, so that the first free end A is insulated from the frame 320 on the other side of the insulating gap 23, and the overall structural strength of the frame 320 is improved. The first ground end B is a position at which the first radiation section 21 is electrically connected to the reference floor 10, and the electrical connection includes but is not limited to physical connection (one-piece forming), electrical connection through a conductive spring, electrical connection through a conductive thimble, and the like.

[0053] Referring to Figure 4 , the second radiation section 22 includes a second free end C and a second ground end D arranged oppositely. The first free end A and the second free end C are separated by the insulating gap 23. The second free end C is the other end of the frame 320 after the insulating gap 23 is arranged on the frame 320. The second ground end D is a position at which the second radiation section 22 is electrically connected to the reference floor 10, and the electrical connection includes but is not limited to physical connection (one-piece forming), electrical connection through a conductive spring, electrical connection through a conductive thimble, and the like.

[0054] Referring to Figure 4 , the positions at which the first ground end B and the second ground end D are electrically connected to the reference floor 10 are both located in the current strong area 16 of the characteristic modal current of the reference floor 10. The characteristic mode represents the inherent mode of the reference floor 10, and by analyzing the characteristic mode of the reference floor 10, a suitable feeding method and feeding position can be found according to the boundary conditions. For low frequencies, the specific current distribution of the characteristic mode is mainly represented by the sinusoidal behavior of the reference floor 10. The characteristic mode has a maximum value and a minimum value of current distribution at a specific position. Taking the 1 / 2 wavelength mode as an example, the current strong area 16 of the characteristic modal current of the reference floor 10 along the first reference ground edge 10 is located in the middle region of the first reference ground edge 10, and the two side regions of the middle region of the reference floor 10 along the first reference ground edge 10 are current weak areas, wherein the characteristic modal current of the current weak area is less than the characteristic modal current of the current strong area 16.

[0055] The position of the first ground end B is orthogonally projected on the reference floor 10 to be located in the current strong area 16. The position of the second ground end D is orthogonally projected on the reference floor 10 to be located in the current strong area 16. For example, the first ground end B is electrically connected to the reference floor 10 through a first ground spring, the first ground spring is arranged in the current strong area 16 and electrically connected to the reference floor 10. The second ground end D is electrically connected to the reference floor 10 through a second ground spring, the second ground spring is arranged in the current strong area 16 and electrically connected to the reference floor 10.

[0056] Optionally, referring to Figure 4The distance between the first ground end B and the third reference ground edge 13 is smaller than the distance between the first ground end B and the fourth reference ground edge 14. The distance between the second ground end D and the third reference ground edge 13 is larger than the distance between the second ground end D and the fourth reference ground edge 14.

[0057] Please refer to Figure 4 The signal source 30 includes but is not limited to a radio frequency transceiver chip and the like. The signal source 30 is arranged in the space surrounded by the frame 320. The signal source 30 is arranged on the main board 61 (please refer to Figure 3 ). The signal source 30 includes a signal end 31 for transmitting a radio frequency signal and a ground end 32 for grounding. Further, the ground end 32 of the signal source 30 is commonly grounded with the reference ground of the matching circuit M, and is not commonly grounded with the reference ground plate 10. The common grounding of the ground end 32 of the signal source 30 and the reference ground of the circuit board on which the matching circuit M is arranged will be described later. The signal end 31 of the signal source 30 corresponds to the "positive electrode" of the signal source 30, and the ground end 32 of the signal source 30 corresponds to the "negative electrode" of the signal source 30. The current flows from the signal end 31 of the signal source 30 to the ground end 32 of the signal source 30 through the radiator 20 and the reference ground plate 10.

[0058] Please refer to Figure 5 The signal end 31 of the signal source 30 is electrically connected to the first radiation section 21, and the ground end 32 of the signal source 30 is electrically connected to the second radiation section 22. The signal source 30 is used to excite the annular current H on the first radiation section 21, the current strong area 16 of the reference ground plate 10, and the second radiation section 22. That is, the excitation signal provided by the signal source 30 flows from the first ground end B of the first radiation section 21 to the reference ground plate 10, and then flows along the first reference ground edge 11 of the reference ground plate 10, and then flows from the second ground end D of the second radiation section 22 to the second free end C of the second radiation section 22, and then flows from the second free end C of the second radiation section 22 to the ground end 32 of the signal source 30. In this way, the signal source 30, the first radiation section 21, the reference ground plate 10, and the second radiation section 22 form a loop, and the signal source 30 forms an annular current H in the loop.

[0059] Please refer to Figure 6 The annular current H further excites the target resonant mode supporting the target frequency band on the reference ground plate 10. The resonant current of the target resonant mode is mainly distributed along the first reference ground edge 11. The resonant current of the target resonant mode is the surface current of the reference ground plate 10, and the directions of the surface currents on the reference ground plate 10 are all along or approximately along the first reference ground edge 11. In this way, the current mode of the resonant current Q of the target resonant mode is a longitudinal current mode.

[0060] In the embodiment, the extending direction of the first reference ground edge 11 and the second reference ground edge 12 is defined as the longitudinal direction D1. The characteristic mode current of the reference ground plane 10 along the first reference ground edge 11 is sequentially the first current weak area 15, the current strong area 16, and the second current weak area 17. The intensity of the resonance current of the target resonance mode in the current strong area 16 is greater than the intensity of the resonance current of the target resonance mode in the first current weak area 15, and the intensity of the resonance current of the target resonance mode in the current strong area 16 is greater than the intensity of the resonance current of the target resonance mode in the second current weak area 17. In other words, the area from the third reference ground edge 13 to the fourth reference ground edge 14 includes the first current weak area 15, the current strong area 16, and the second current weak area 17 sequentially arranged. The current strong area 16 is a non-edge area of the reference ground plane 10 along the longitudinal direction D1, that is, the current strong area 16 is a middle area of the reference ground plane 10 along the longitudinal direction D1. Of course, in other alternative embodiments, the extending direction of the first reference ground edge 11 and the second reference ground edge 12 can also be the transverse direction D2.

[0061] The current strong area 16 is located in the middle area of the longitudinal direction D1. Specifically, the distance between the current strong area 16 and the third reference ground edge 13 is greater than or equal to 1 / 4 of the length of the first reference ground edge 11. The distance between the current strong area 16 and the fourth reference ground edge 14 is greater than or equal to 1 / 4 of the length of the first reference ground edge 11. In the process of further exciting the target resonance mode supporting the target frequency band on the reference ground plane 10, the annular current H will excite relatively weak currents on the first current weak area 15 and the second current weak area 17, thereby forming a current distribution with weak ends and strong middle and the same direction on the reference ground plane 10 along the longitudinal direction D1, which is beneficial to exciting the target resonance mode on the reference ground plane 10.

[0062] In other words, referring to Figure 6 , the resonance current Q of the target resonance mode has different intensities in the direction along the first reference ground edge 11. The intensity of the resonance current of the target resonance mode in the current strong area 16 is greater than the intensity of the resonance current of the target resonance mode in the first current weak area 15, and the intensity of the resonance current of the target resonance mode in the current strong area 16 is greater than the intensity of the resonance current of the target resonance mode in the second current weak area 17. That is, the resonance current Q of the target resonance mode on the reference ground plane 10 has a weak-strong-weak distribution in the direction along the first reference ground edge 11. Specifically, the current is the strongest in the area between the corresponding first ground terminal B and the second ground terminal D on the reference ground plane 10, and the current intensity gradually weakens from the first ground terminal B to the fourth reference ground edge 14, and the current intensity gradually weakens from the second ground terminal D to the third reference ground edge 13, Figure 6The arrow density in the figure represents the current intensity, and the denser the arrow density, the stronger the current intensity, and the sparser the arrow density, the weaker the current intensity.

[0063] The target resonance mode is substantially a 1 / 2 wavelength mode of the target frequency band or is a 1 / 2 wavelength mode of the target frequency band. Since the target resonance mode is formed on the reference ground plate 10 with high efficiency, the reference ground plate 10 is equivalent to a "radiation structure" of the target frequency band, so that the antenna assembly 100 has high efficiency when operating in the target frequency band.

[0064] The target resonance mode is a 1 / 2 wavelength mode in the longitudinal direction D1.

[0065] The distance between the current intensity area 16 of the characteristic mode current of the reference ground plate 10 and the third reference ground edge 13 is greater than or equal to 1 / 4 of the length of the first reference ground edge 11, and the distance between the current intensity area 16 of the characteristic mode current of the reference ground plate 10 and the fourth reference ground edge 14 is greater than or equal to 1 / 4 of the length of the first reference ground edge 11.

[0066] When the distance between the current intensity area 16 and the third reference ground edge 13 is less than 1 / 4 of the length of the first reference ground edge 11, or the distance between the current intensity area 16 and the fourth reference ground edge 14 is less than 1 / 4 of the length of the first reference ground edge 11, a weak-strong-weak current distribution cannot be formed in the longitudinal direction D1 of the reference ground plate 10, and thus the target resonance mode cannot be formed on the reference ground plate 10.

[0067] The antenna assembly 100 provided by the present application is designed such that the free ends of the first radiation section 21 and the second radiation section 22 are opposite to each other, the first radiation section 21 and the second radiation section 22 are both electrically connected to the current intensity area 16 of the reference ground plate 10, the signal end 31 of the signal source 30 is electrically connected to the first radiation section 21, the ground end 32 of the signal source 30 is electrically connected to the second radiation section 22, and the signal source 30, the first radiation section 21, the current intensity area 16 of the reference ground plate 10, and the second radiation section 22 form a current loop. In this way, the signal source 30 is used to excite a ring-shaped current H on the first radiation section 21, the current intensity area 16 of the reference ground plate 10, and the second radiation section 22, and the ring-shaped current H excites a target resonance mode supporting the target frequency band on the reference ground plate 10. The resonance current Q of the target resonance mode is mainly distributed along the first reference ground edge 11, that is, the signal source 30 and the radiator 20 act as a radiation driver to excite a resonance current (for example, a longitudinal current distribution) supporting the target frequency band and along the first reference ground edge 11 on the reference ground plate 10, so as to improve the operating efficiency of the target frequency band and improve the antenna performance.

[0068] The target frequency band supported by the target resonant mode is a frequency band range corresponding to the target resonant mode in the S11 curve at a return loss of about -5 dB (of course, -6 dB, -7 dB, -8 dB, -9 dB, -10 dB, etc.).

[0069] The target frequency band is not specifically limited in the present application. The target 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.

[0070] Taking the electronic device 1000 as a mobile phone and the first reference ground edge 11 as a long edge as an example, the overall longitudinal D1 size of the electronic device 1000 is about 15 mm-17 mm. The length of the first reference ground edge 11 is slightly smaller than the overall longitudinal D1 size of the electronic device 1000, and the length of the first reference ground edge 11 is close to 1 / 2 wavelength of the low frequency band. In this way, the target frequency band is the LB frequency band, and the 1 / 2 wavelength resonant mode of the longitudinal D1 can be excited on the reference ground plate 10 in the mobile phone, so that the reference ground plate 10 forms a resonance in the LB frequency band, thereby improving the efficiency of the LB frequency band.

[0071] In the present embodiment, the target resonant mode corresponds to the 1 / 2 wavelength mode. In other words, the current loop formed by the signal source 30, the first radiation section 21 and the second radiation section 22 excites the resonant current distribution formed on the reference ground plate 10, and the working mode of the resonant current Q of the target resonant mode in the longitudinal D1 can be the 1 / 2 wavelength mode, or slightly greater than the 1 / 2 wavelength mode, or slightly less than the 1 / 2 wavelength mode.

[0072] Please refer to Figure 7 , the working mode of the resonant current Q of the target resonant mode in the longitudinal D1 can be the 1 / 2 wavelength mode. The current at the third reference ground edge 13 is the first current zero point N1 (i.e. the weakest point of the current), the current from the second ground end D to the first ground end B is the current strong area, and the current strong area includes the current strong point N2. The current at the fourth reference ground edge 14 is the second current zero point N3 (i.e. the weakest point of the current).

[0073] Please refer to Figure 8 , the working mode of the resonant current Q of the target resonant mode in the longitudinal D1 can be slightly less than the 1 / 2 wavelength mode. The specific wavelength mode can satisfy the standard as long as the efficiency of the target frequency band reaches -10 dB or more, for example. The current at the third reference ground edge 13 is the weak current from the current strong point N2 to the first current zero point N1, the current from the second ground end D to the first ground end B is the current strong area, and the current strong area includes the current strong point N2. The current at the fourth reference ground edge 14 is the weak current from the current strong point N2 to the second current zero point N3.

[0074] Please refer to Figure 9 , the working mode of the resonant current Q of the target resonant mode can be slightly less than 1 / 2 wavelength mode in the longitudinal direction D1, and the wavelength mode can be selected to satisfy the efficiency of the target frequency band, for example, the efficiency of the target frequency band is greater than -10dB. The current at the third reference ground edge 13 is a weak current that increases after decreasing from the current strong point N2 to the first current zero point N1. The current between the second ground end D and the first ground end B is a current strong area, which includes the current strong point N2. The current at the fourth reference ground edge 14 is a weak current that increases after decreasing from the current strong point N2 to the second current zero point N3.

[0075] When the length of the reference ground plate 10 in the longitudinal direction D1 is 1 / 2 wavelength of the target frequency band, the center of the radiator 20 can be arranged to correspond to the center of the first reference ground edge 11 to excite the 1 / 2 wavelength mode of the target frequency band in the longitudinal direction D1 of the reference ground plate 10. When the length of the reference ground plate 10 in the longitudinal direction D1 is greater than or equal to 1 / 2 wavelength of the target frequency band, the center of the radiator 20 can be adjusted to deviate from the center of the first reference ground edge 11 to excite the 1 / 2 wavelength mode of the target frequency band in the longitudinal direction D1 of the reference ground plate 10.

[0076] One antenna assembly 100 provided in an embodiment of the present application is arranged at the first reference ground edge 11. In other embodiments, two symmetrical antenna assemblies 100 can be arranged at the first reference ground edge 11 and the second reference ground edge 12.

[0077] The principle that the current on the reference ground plate 10 contributes most of the radiation of the target frequency band in the reference ground plate 10-radiator 20 is described below with the electronic device 1000 as an example of a mobile phone.

[0078] Please refer to Figures 10a-10d , Figures 10a-10d is a schematic diagram in which the radiator 20 and the reference ground plate 10 are equivalent to a dipole antenna, and the width of the antenna element equivalent to the reference ground plate 10 gradually increases. The relatively large reference ground plate 10 is regarded as an antenna element with a certain width. In this way, the entire reference ground plate 10-radiator 20 is like a dipole antenna with a feed point bias. The dipole antenna distributes 1.5 wavelengths of eigencurrent, and as the width of the antenna element equivalent to the reference ground plate 10 gradually increases, the current on the reference ground plate 10 is the main eigencurrent, and the current on the radiator 20 of the antenna assembly 100 is relatively small, so the current on the reference ground plate 10 contributes most of the radiation of the target frequency band.

[0079] For example, the basic size of a mobile phone is about 155mm x 75mm, and for a low-frequency antenna, the longitudinal D1 size of the whole machine is equivalent to 1 / 2 wavelength of the low frequency. According to the basic principle of dipole antenna, that is, to fully excite the longitudinal current, the equivalent aperture of the antenna can be increased, and the efficiency is improved. At the same time, the reference floor 10 is a more effective radiator, and the lower the working frequency, the more significant the current effect of the reference floor 10, that is, for a low-frequency antenna, fully exciting the longitudinal current on the reference floor 10 can effectively improve the radiation efficiency.

[0080] Please refer to Figure 11 , Figure 11 is the characteristic current distribution diagram with the largest proportion of longitudinal current mode on the reference floor 10. For low frequency, the characteristic current with the largest proportion of longitudinal current mode on the reference floor 10 can be obtained through simulation, and the working mode of the characteristic current is the characteristic mode. The specific current distribution of the characteristic mode on the reference floor 10 is mainly characterized by the sinusoidal behavior of the edge of the reference floor 10. It can be seen that the characteristic mode has its maximum and minimum values of current distribution at specific positions. In addition to the current distribution, the voltage distribution, that is, the electric field distribution on the reference floor 10, can also be considered. The phase difference between the electric field and the current distribution is 90°. That is, the minimum value of the electric field distribution is the same as the maximum value of the current distribution, and vice versa.

[0081] Please refer to Figure 12 , Figure 12 is a schematic diagram of the physical structure of the inductive coupling element. The inductive coupling element is arranged in a spaced manner with the reference floor 10. Please refer to Figure 4 together, the inductive coupling element includes a signal source 30 and a radiator 20, both ends of the radiator 20 are short-circuited with the reference floor 10, an insulating gap 23 is arranged in the middle of the radiator 20, and the signal end 31 and the ground end 32 of the signal source 30 are respectively electrically connected to both ends of the inductive coupling element provided with the insulating gap 23. In order to obtain higher radiation efficiency, it is necessary to better excite the longitudinal current of the floor, that is, it is necessary to better excite the current distribution of Figure 11 , that is, to excite the characteristic mode of the reference floor 10, which is the inherent mode of the reference floor 10. Placing the inductive coupling element (inductive coupling element, ICE) at the maximum position of the current distribution can excite the characteristic mode of the reference floor 10.

[0082] Please refer to Figure 13 , Figure 13is an equivalent diagram of the inductive coupling element arranged on the reference floor 10. The embodiment of the present application places the inductive coupling element in the middle of the reference floor 10 to excite the characteristic mode of the reference floor 10. At this time, in the reference floor 10-radiator 20, the reference floor 10 serves as the main radiation structure of low frequency, and contributes to most of the radiation in the target frequency band. The signal source 30 and the radiator 20 of the antenna assembly 100 serve as the radiation driving device of the entire antenna system, and become the excitation condition for the reference floor 10 to work in the target frequency band. The proportion of the radiator 20 of the antenna assembly 100 in the radiation energy is very small.

[0083] The present application designs the first radiation section 21 and the second radiation section 22 to be located at the middle position of the longitudinal direction D1 of the reference floor 10 (the strong current area of the longitudinal direction D1 characteristic mode on the reference floor 10), and the signal source 30, the first radiation section 21, the reference floor 10 and the second radiation section 22 form a current loop to excite the current distribution of the longitudinal direction D1 on the reference floor 10 and close to the 1 / 2 wavelength mode. The radiator 20-reference floor 10 can be equivalent to a dipole antenna. According to the basic principle of the dipole antenna, that is, to fully excite the longitudinal current, the equivalent aperture of the antenna can be increased, and the efficiency is improved. At the same time, the reference floor 10 is a more effective radiator, and the lower the working frequency, the more significant the current effect of the reference floor 10. That is, for a low-frequency antenna, fully exciting the longitudinal current on the reference floor 10 can effectively improve the radiation efficiency.

[0084] With the increasing functions of the electronic device 1000, the number of internal electronic devices and antennas increases, and the space inside the electronic device 1000 is limited. In particular, the antenna mode of the low-frequency antenna generally adopts the 1 / 4 wavelength basic mode, so that the size of the metal embedded or metal frame type low-frequency antenna is about 50-80mm, which is usually 2 times or even more than 8 times the size of other middle and high frequency antennas, forcing other antennas to be compressed in space and reduce performance. Because the size of the low-frequency antenna is relatively long, how to reduce the size of the low-frequency antenna while ensuring the performance of the antenna is a technical problem to be solved.

[0085] The antenna assembly 100 provided by the present application has the reference floor 10 as the main radiation structure of low frequency, and the proportion of the radiator 20 of the antenna assembly 100 in the radiation energy is very small, so that reducing the size of the radiator 20 has little effect on the total radiation performance of the entire antenna system.

[0086] The application provides that the length of the radiator 20 is less than 1 / 4 wavelength mode of the target frequency band (low frequency), that is, less than the general low-frequency antenna size, because the radiator 20 has small radiation contribution to the low frequency, the first radiation section 21 and the second radiation section 22 are designed at the middle position in the longitudinal direction D1 on the reference floor 10 (the strong current area of the longitudinal D1 characteristic mode on the reference floor 10), the signal source 30, the first radiation section 21, the reference floor 10 and the second radiation section 22 form a current loop to excite the current distribution formed in the longitudinal direction D1 on the reference floor 10 and close to the 1 / 2 wavelength mode of the low frequency, the radiator 20-reference floor 10 can be equivalent to a dipole antenna, according to the basic principle of the dipole antenna, that is, the longitudinal current is sufficiently excited, so that the equivalent aperture of the antenna can be increased, and the low-frequency efficiency is improved; meanwhile, the reference floor 10 is a more effective radiator, and the lower the working frequency is, the more significant the current effect of the reference floor 10 is, that is, for a low-frequency antenna, the longitudinal current on the reference floor 10 is sufficiently excited, so that the low-frequency radiation efficiency can be effectively improved.

[0087] Optionally, the length of the radiator 20 is less than 1 / 4 wavelength of the target frequency band, and the length of the radiator 20 is greater than or equal to 1 / 10 wavelength of the target frequency band, and the antenna assembly 100 provided by the application still has good efficiency even in the case that the length of the radiator 20 is less than 1 / 4 wavelength of the target frequency band, so that the size of the low-frequency antenna is reduced while the antenna performance is ensured.

[0088] If the length of the radiator 20 is less than 1 / 10 wavelength of the target frequency band, the radiator 20 can not be able to excite low-frequency current.

[0089] Further, the length of the radiator 20 is about 1 / 8 wavelength of the target frequency band, which is more than 20% smaller than the conventional 1 / 4 wavelength antenna size, so that the size of the low-frequency antenna is reduced while the antenna performance is ensured, space is left for other antennas, and the overall antenna performance is improved.

[0090] Please refer to Figure 14 , the antenna assembly 100 further comprises a matching circuit M. The first radiation section 21 comprises a feeding point E. The feeding point E is electrically connected to a position on the first radiation section 21. Optionally, the feeding point E is close to or located at the first free end A. The matching circuit M is electrically connected between the feeding point E and the signal source 30. The matching circuit M is used for adjusting impedance matching between the signal source 30 port and the radiator 20 port. The matching circuit M comprises at least one of capacitors, inductors, resistors and the like.

[0091] The matching circuit M comprises at least one capacitor element. One end of the capacitor element is electrically connected to the signal end 31 of the signal source 30, and the other end of the capacitor element is electrically connected to the first radiation section 21. The capacitor element can realize impedance matching by being added at the feeding point.

[0092] The number of the capacitive elements is multiple. The multiple capacitive elements are connected in parallel between the signal terminal 31 of the signal source 30 and the first radiating section 21.

[0093] Referring to Figure 14 , the matching circuit M further comprises a switching unit K. The switching unit K is electrically connected between the multiple capacitive elements and the signal terminal 31 of the signal source 30.

[0094] One end of each of the capacitive elements is electrically connected to a feeding point E, and the other end of each of the capacitive elements is electrically connected to one end of the switching unit K, and the other end of the switching unit K is electrically connected to the signal terminal 31 of the signal source 30. The capacitance values of different capacitive elements can be the same or different.

[0095] The switching unit K is used to switch the on-off state between the multiple capacitive elements and the signal terminal 31 of the signal source 30, so as to switch the sub-frequency bands of the target frequency band. When the target frequency band is the LB frequency band, the sub-frequency bands of the LB frequency band include but are not limited to the B20 frequency band and the B28 frequency band. The switching unit K can select one capacitive element to be turned on between the signal source 30 and the radiator 20, or multiple capacitive elements to be turned on between the signal source 30 and the radiator 20.

[0096] The switching unit K includes but is not limited to a transistor, a MOS tube, a triode, etc.

[0097] Since the greater the capacitance value between the signal source 30 and the radiator 20, the easier the low-frequency signal to pass through, the low-frequency frequency band signal can be switched in a small range by switching different sizes of capacitive elements.

[0098] Of course, in other embodiments, when the electrical length of the radiator 20 is sufficient, a non-series capacitive element can also be arranged between the signal source 30 and the radiator 20.

[0099] Further referring to Figure 14 , the matching circuit M further comprises a matching element L1. The matching element L1 includes a capacitor and / or an inductor. One end of the matching element L1 is electrically connected between the signal terminal 31 of the signal source 30 and the switching unit K, and the other end of the matching element L1 is grounded. The matching element L1 is used to tune the impedance matching of the signal source 30 port and the radiator 20 port.

[0100] The antenna assembly 100 provided in this application has a radiator 20 with its two ends short-circuited to the reference ground 10. The electrical length of the radiator 20 is approximately 1 / 8 wavelength for low frequencies. The radiator 20 includes a first radiating segment 21 and a second radiating segment 22 spaced apart. A matching circuit M is electrically connected between the signal source 30 and the first radiating segment 21. The matching circuit M includes a capacitor connected in series between the signal source 30 and the first radiating segment 21, and a matching element L1 (inductor) connected in parallel between the signal source 30 and the first radiating segment 21. Their relative order is as follows: first radiating segment 21, series capacitor, parallel inductor, and signal source 30. The capacitor connected to the first radiating segment 21 is fed in a manner equivalent to capacitive coupling excitation.

[0101] In this embodiment, please refer to Figure 14 The capacitor element connected in series between the signal source 30 and the first radiating segment 21 includes four parallel capacitors. These four parallel capacitors are combined to form different capacitance values, each corresponding to a different low-frequency sub-band, such as the B8 band, B20 band, and B28 band. Sub-band switching is performed through the switching unit K. Optionally, the switching unit K is equivalent to a single-pole four-throw switch or a multi-pole multi-throw switch. One end of the switching unit K, RF1 to RF4, is connected to the capacitor element (C1 to C4), and the other end of the switching unit K, RF1 to RF4, is connected to the capacitor element (C1 to C4). C It is connected to the signal source 30 via an RF transmission line, and the total capacitance value of the power supply path is controlled by switching unit K.

[0102] Matching element L1 is a parallel inductor used to improve the matching state of the power supply path. The RF described below... X ( X The states 1, 2, 3, and 4) indicate whether the RF is on or off. X Ports and RF C The on / off status of the port. When RF1 is connected to RF... C When the port is connected, other RF X When not connected, it is equivalent to capacitor C1 being connected in series between signal source 30 and radiator 20 to form capacitive coupling feed. At this time, the series capacitance in the feed path is C1, corresponding to the highest low-frequency band, such as the B8 band; when RF1 and RF2 are both connected to RF C When the port is connected, other RF X When not connected, the series capacitance in the power supply path is equivalent to C1 + C2, corresponding to a low-frequency band slightly below the middle, such as the B20 band; when RF1, RF2, and RF3 are all connected to RF... C When the port is connected, RF4 is not connected to RF. CWhen the port is connected, the series capacitance value on the path is C1+C2+C3, corresponding to the lowest frequency band, such as the B28 frequency band. The above can realize the switching of the LB frequency band between the B8 frequency band, the B20 frequency band, and the B28 frequency band. Of course, the switch unit K can also be switched to other series capacitance values to support other sub-bands in the LB frequency band.

[0103] Optionally, the matching circuit M and the signal source 30 are arranged on the main board 61 (or the auxiliary board 62) together, wherein one end of the matching circuit M is electrically connected to the signal end 31 of the signal source 30, and the other end of the matching circuit M is electrically connected to the feeding point E of the first radiation section 21 through the first conductive member. The other end of the signal source 30 is electrically connected to the second radiation section 22 through the second conductive member. The first conductive member 33 includes but is not limited to a conductive spring, a conductive screw, a conductive thimble, etc. The second conductive member 34 includes but is not limited to a conductive spring, a conductive screw, a conductive thimble, physical connection, etc.

[0104] Further optionally, referring to Figure 15 , the antenna assembly 100 further comprises an antenna circuit board 40 and a radio frequency connector 41 arranged on the antenna circuit board 40.

[0105] The antenna circuit board 40 includes but is not limited to a flexible circuit board or a hard circuit board. The antenna circuit board 40 is used to arrange the matching circuit M and the radio frequency connector 41. The antenna circuit board 40 is independent of the main board 61 and the auxiliary board 62 of the electronic device 1000.

[0106] The matching circuit M is arranged on the antenna circuit board 40. Further, the antenna assembly 100 further comprises an electrical connection element electrically connected to the feeding point E of the first radiation section 21, which is arranged on the antenna circuit board 40. The electrical connection element is used to electrically connect the matching circuit M (specifically, the capacitor element far from one end of the switch unit K) and the feeding point E of the first radiation section 21. Optionally, the electrical connection element includes but is not limited to a conductive spring, etc.

[0107] The radio frequency connector 41 is electrically connected to the signal end 31 of the signal source 30 and the matching circuit M (specifically, the matching element L1 connected to one end of the switch unit K).

[0108] In other words, the signal source 30 is electrically connected to the radio frequency connector 41 through the radio frequency transmission line, the radio frequency connector 41 is electrically connected to the end of the matching element L1 not connected to the ground and the end of the switch unit K far from the capacitor element, the other end of the switch unit K is electrically connected to one end of each capacitor element, the other end of each capacitor element is electrically connected to the electrical connection element (for example, a conductive spring), and the electrical connection element is electrically connected to the second radiation section 22.

[0109] In the embodiment, the antenna circuit board 40 is separately arranged in the antenna assembly 100, and the matching circuit M is separately arranged on the antenna circuit board 40. In this way, the matching circuit M does not need to be arranged on the same circuit board as the signal source 30. In the embodiment, there are certain requirements for the arrangement position of the radiator 20 on the frame 320. When the radiator 20 is arranged at a specific position on the frame 320, a certain interval between the radiator 20 and the main board 61 or the auxiliary board 62 on which the signal source 30 is arranged can be caused. If the matching circuit M is arranged on the main board 61 or the auxiliary board 62 together with the signal source 30, the interval between the matching circuit M and the first radiation section 21 can be too long, which can cause large transmission loss. In the application, the matching circuit M is separately arranged on the antenna circuit board 40, and the first radiation section 21 does not need to be arranged near the main board 61 or the auxiliary board 62 of the signal source 30, so as to be arranged at the current strong area 16 corresponding to the reference ground plate 10, thereby exciting the target resonance mode on the reference ground plate 10.

[0110] Optionally, referring to Figure 15 , the antenna circuit board 40 further comprises a reference ground layer 42. Specifically, the antenna circuit board 40 comprises an outer insulating dielectric layer and a metal layer embedded in the insulating dielectric layer, and the metal layer can serve as the reference ground layer 42. The reference ground layer 42 is electrically connected to the ground end 32 of the signal source 30 and the second radiation section 22. In other words, the ground end 32 of the signal source 30 is electrically connected to the reference ground layer 42 of the antenna circuit board 40 through the radio frequency connector 41, and the reference ground layer 42 of the antenna circuit board 40 is electrically connected to the second radiation section 22.

[0111] Optionally, referring to Figure 16 and Figure 17 , the antenna assembly 100 further comprises a support table 24 integrally formed with the second radiation section 22. When the second radiation section 22 is the frame 320, the support table 24 is a plate member protruding from the inner surface of the frame 320 towards the inside of the electronic device 1000. The support table 24 is integrally formed with the frame 320.

[0112] Referring to Figure 16 , the support table 24 is fixedly connected to the antenna circuit board 40. In other words, the antenna circuit board 40 can be fixed on the support table 24 by screwing, clamping, bonding or the like.

[0113] The second radiation section 22, the support table 24, and the reference ground layer 42 of the antenna circuit board 40 are electrically connected in sequence.

[0114] Optionally, the antenna circuit board 40 can be fixed to the support platform 24 by conductive screws, wherein the support platform 24 is made of conductive material. The conductive screws can not only fix the antenna circuit board 40, but also connect the reference ground layer 42 of the antenna circuit board 40 and the support platform 24 to make the reference ground layer 42 of the antenna circuit board 40 and the support platform 24 conductive.

[0115] Optionally, the two ends of the C-shaped conductive clamp contact the reference ground layer 42 of the antenna circuit board 40 and the support platform 24 to make the reference ground layer 42 of the antenna circuit board 40 and the support platform 24 conductive. The screws pass through the two ends of the C-shaped conductive clamp, the reference ground layer 42 of the antenna circuit board 40 and the support platform 24 to fix the reference ground layer 42 of the antenna circuit board 40 and the support platform 24.

[0116] In the embodiment, the support platform 24 is integrally formed with the second radiation section 22. The support platform 24 not only fixes the antenna circuit board 40, but also forms an electrical connection path for the ground end 32 of the signal source 30 to be electrically connected to the second radiation section 22 through the reference ground layer 42 of the antenna circuit board 40. In addition, the support platform 24 is formed in the same process as the second radiation section 22, which is convenient for preparation.

[0117] Referring to Figures 16-18 , the support platform 24 and the signal source 30 are located on the same side of the second radiation section 22. The signal source 30 is located on the main board 61 or the auxiliary board 62 inside the frame 320 (specifically, the side of the second radiation section 22 facing the inside of the electronic device 1000). The support platform 24 is located inside the frame 320 (specifically, the side of the second radiation section 22 facing the inside of the electronic device 1000).

[0118] Referring to Figures 16-18 , the support platform 24 is connected to the second free end C. Specifically, the support platform 24 is arranged close to the insulating gap 23, so that as many parts of the second radiation section 22 as possible form the path of the loop current H.

[0119] Optionally, the size of the support platform 24 is approximately the same as the size of the antenna circuit board 40.

[0120] The stacking direction of the support platform 24 and the antenna circuit board 40 is the thickness direction of the electronic device 1000. The antenna circuit board 40 is arranged on the side of the support platform 24 facing the back cover.

[0121] Optionally, the height of the support platform 24 can be approximately flush with the reference ground layer 10. Specifically, during the process of manufacturing the middle frame, a part of the inside of the frame 320 is reserved to form the support platform 24, and the peripheral side of the support platform 24 is disconnected from other parts.

[0122] Optionally, referring to Figure 18The height of the support platform 24 is higher than the height of the reference floor 10, for example, the support platform 24 is located between the reference floor 10 and the back cover. In this way, the support platform 24 and the reference floor 10 or the circuit board 60 can overlap in the thickness direction D3. The support platform 24 and the reference floor 10 or the circuit board 60 form a double-layer structure, so that the arrangement of the support platform 24 does not occupy the original horizontal space of the reference floor 10 or the circuit board 60, but utilizes the vertical space of the reference floor 10 or the circuit board 60 towards the back cover.

[0123] Please refer to Figures 16-18 The antenna assembly 100 further comprises a conductive protrusion 25 and a conductive spring 44. The conductive protrusion 25 is protruded on the first radiation section 21. The conductive protrusion 25 is integrally formed with the first radiation section 21. The conductive protrusion 25 and the first radiation section 21 are formed in the same process, which is convenient for preparation.

[0124] Please refer to Figures 16-18 The conductive protrusion 25 is connected to the first free end A. Specifically, the conductive protrusion 25 is arranged close to the insulating gap 23, so that as many parts of the first radiation section 21 as possible form the path of the annular current H. The conductive protrusion 25 and the support platform 24 are located on the same side of the radiator 20. The conductive protrusion 25 and the support platform 24 are both located on the inner side of the frame 320, and the conductive protrusion 25 and the support platform 24 are respectively arranged on the opposite sides of the insulating gap 23.

[0125] Please refer to Figures 16-18 The conductive spring 44 is arranged on the antenna circuit board 40. One end of the conductive spring 44 is electrically connected to one end of the matching circuit M away from the signal source 30. The other end of the conductive spring 44 abuts against the conductive protrusion 25.

[0126] Please refer to Figures 16-18 The conductive spring 44 is the aforementioned electrically connecting element electrically connecting the feed point E of the first radiation section 21. The arrangement direction of the conductive spring 44 is along the arrangement direction of the first radiation section 21 and the second radiation section 22. The arrangement of the conductive protrusion 25 facilitates the conductive spring 44 arranged in the longitudinal direction D1 to electrically connect the second radiation section 22 by abutting against the conductive protrusion 25.

[0127] Optionally, please refer to Figure 16 and Figure 17 The conductive protrusion 25 and the support platform 24 (or the antenna circuit board 40) can be arranged at substantially the same height (in the thickness direction of the electronic device 1000), wherein the abutting surface of the conductive spring 44 is located at the bottom of the conductive spring 44, by fixing one end of the bottom of the conductive spring 44 to the antenna circuit board 40, the abutting surface of the other end of the bottom of the conductive spring 44 abuts against one side of the conductive protrusion 25 towards the back cover.

[0128] Optionally, please refer to Figure 20 The conductive protrusion 25 and the support platform 24 (or the antenna circuit board 40) can be arranged at different heights (in the thickness direction of the electronic device 1000), and the abutting surface of the conductive spring piece 44 is located at the top of the conductive spring piece 44. By fixing the bottom of the conductive spring piece 44 to the antenna circuit board 40, the abutting surface at the top of the conductive spring piece 44 abuts against the side of the conductive protrusion 25 away from the back cover.

[0129] Optionally, the size of the conductive protrusion 25 is smaller than the size of the support platform 24. The size of the conductive protrusion 25 can be reduced as much as possible while ensuring stable abutment with the conductive spring piece 44.

[0130] In this embodiment, the insulating gap 23 between the first free end A of the first radiating section 21 and the second free end C of the second radiating section 22 is located in the (1 / 4-3 / 4) section of the radiator 20.

[0131] When the insulating gap 23 is located too close to the first ground end B or the second ground end D, for example, the distance between the insulating gap 23 and the first ground end B is less than 1 / 4 of the total length of the radiator 20, it may cause the frequency deviation of the resonant mode formed on the reference ground plate 10, or the characteristic mode or the target frequency band on the reference ground plate 10 cannot be excited, or the efficiency is low. The present embodiment designs the insulating gap 23 between the first free end A of the first radiating section 21 and the second free end C of the second radiating section 22 to be located in the (1 / 4-3 / 4) section of the radiator 20, so as to better excite the characteristic mode of the longitudinal D1 on the reference ground plate 10, improve the efficiency of the low-frequency antenna, and realize the miniaturization of the low-frequency antenna.

[0132] The electronic device 1000 further includes a circuit board 60. The circuit board 60 is a main board 61 or a sub-board 62 of the mobile phone.

[0133] Optionally, please refer to Figure 19 The circuit board 60 and the support platform 24 on the second radiating section 22 are arranged opposite and spaced apart in the thickness direction of the electronic device 1000. The space between the circuit board 60 and the support platform 24 is used to arrange electronic devices. The signal source 30 is arranged on the circuit board 60, and the signal source 30 is arranged adjacent to the support platform 24. The antenna circuit board 40 on the support platform 24 is electrically connected to the signal end 31 of the signal source 30 and the ground end 32 of the signal source 30. The signal source 30 can be as close as possible to the support platform 24 to reduce the length of the radio frequency connection line between the signal source 30 and the antenna circuit board 40, thereby reducing the loss.

[0134] Since the support table 24 protrudes towards the inside of the frame 320, and the space inside the electronic device 1000 is limited, how to reasonably layout to reduce the space waste inside the electronic device 1000 becomes a problem to be solved. In the embodiment, the circuit board 60 is arranged below the support table 24, the circuit board 60 and the support table 24 are designed in two layers, the support table 24 utilizes the upper space of the circuit board 60, reduces the space occupied by the support table 24 on the setting surface of the circuit board 60, reduces the space waste, and improves the space utilization.

[0135] Please refer to Figure 21 , the electronic device 1000 further includes a battery 70. Optionally, the radiator 20 is arranged at a middle position of the first side edge 323 or the second side edge 324, which corresponds to the position of the battery 70. That is, the radiator 20 is arranged beside the battery 70. Due to the arrangement of the battery 70, the radiator 20 has a certain interval with the main board 61 or the auxiliary board 62, so that by arranging the support table 24 on the radiator 20 and arranging the antenna circuit board 40 on the support table 24, the problem that the radiator 20 is arranged beside the battery 70 and is relatively far away from the main board 61 or the auxiliary board 62 can be effectively solved. However, the position between the support table 24 and the battery 70 is prone to positional interference.

[0136] The support table 24 on the second radiation section 22 is arranged in a stacked manner with the battery 70 in the thickness direction of the electronic device 1000. The radiator 20 is arranged beside the battery 70 of the electronic device 1000, and the support table 24 on the second radiation section 22 is arranged opposite to and spaced apart from the battery 70 in the thickness direction of the electronic device 1000. In this way, the support table 24 is staggered with the battery 70 to avoid positional interference between the support table 24 and the battery 70.

[0137] In the embodiment, the second radiation section 22 is closer to the bottom edge 322, and the first radiation section 21 is closer to the top edge 321. Of course, in other embodiments, the second radiation section 22 is closer to the top edge 321, and the first radiation section 21 is closer to the bottom edge 322.

[0138] Optionally, when the electronic device 1000 is a mobile phone, the radiator 20 is arranged at a middle position of the first side edge 323 or the second side edge 324, since the middle position of the first side edge 323 or the second side edge 324 is generally provided with a power key or a volume key. The power key or the volume key can be arranged on the first radiation section 21, that is, arranged between the conductive protrusion 25 and the first ground end B.

[0139] Of course, in other embodiments, the radiator 20 can also avoid the power key and the volume key under the condition that the efficiency of the radiator 20 in the LB frequency band meets the standard.

[0140] The middle plate 310 of the electronic device 1000 not only supports the entire electronic device 1000, but also serves as a reference ground for the entire electronic device 1000, the radiator, the radio frequency chip, the baseband chip and other electrical systems. Most of the middle plate 310 of the electronic device 1000 is made of metal materials such as aluminum alloy. The frame 320 is a metal frame. The frame 320 is integrally formed with the middle plate 310 and connected together. The radiator 20 forms the first radiation section 21 and the second radiation section 22 by opening the insulating gap 23 on the frame 320. The insulating gap 23 can be filled with non-conductive materials such as plastic. The total length of the radiator 20 is about 1 / 8 wavelength. One end of the conductive spring 44 is welded to the antenna circuit board 40 and connected to the radio frequency transmission line on the main board 61 or the auxiliary board 62. The other end of the conductive spring 44 is in contact with the first radiation section 21. The radio frequency signal reaches the radiator 20 through the conductive protrusion 25 and is radiated. The antenna circuit board 40 is an antenna plate. The matching circuit M and the radio frequency connector 41 are located on the antenna circuit board 40. The support table 24 is a metal platform on the second radiation section 22, which is used to support the antenna circuit board 40 and is connected to the antenna circuit board 40 by welding or screws. It needs to have good electrical contact with the antenna circuit board 40, so that the antenna circuit board 40 and the support table 24 are grounded. The conductive protrusion 25 is a platform on the first radiation section 21, which provides a contact point for the conductive spring 44 to enable the signal to enter the first radiation section 21.

[0141] Please refer to Figure 22 , Figure 22 is the S parameter curve of the antenna assembly 100 in the electronic device 1000 when switching in the LB frequency band. Curve a is the S parameter curve of the antenna assembly 100 switched to the B28 frequency band. Curve b is the S parameter curve of the antenna assembly 100 switched to B5. Curve c is the S parameter curve of the antenna assembly 100 switched to B8. It can be seen that the antenna assembly 100 provided by the present application can be switched between the B28 frequency band, the B5 frequency band and the B8 frequency band by switching the capacitance value of the capacitive element in series between the signal source 30 and the radiator 20 in the matching circuit M. Further, by designing the capacitance value of the capacitive element in series between the signal source 30 and the radiator 20, the antenna assembly 100 can support sub-bands between 0.7GHz-1GHz.

[0142] Please refer to Figure 23 , Figure 23is the efficiency curve of the electronic device 1000 when switching in the LB band. Curve a is the S parameter curve of the antenna assembly 100 switching to the B28 band. Curve b is the S parameter curve of the antenna assembly 100 switching to the B5 band. Curve c is the S parameter curve of the antenna assembly 100 switching to the B8 band. It can be seen that the antenna assembly 100 provided by the present application has good working efficiency when switching between the B28 band, the B5 band and the B8 band by switching the capacitance value of the capacitive element in series between the signal source 30 and the radiator 20 in the matching circuit M. Further, the antenna assembly 100 has good working efficiency when switching between the sub-bands between 0.7 GHz and 1 GHz by designing the capacitance value of the capacitive element in series between the signal source 30 and the radiator 20.

[0143] The present application makes the reference floor 10 mainly contribute to radiation by fully exciting the longitudinal current on the reference floor 10 by inductive coupling in the high current area 16 (the high current area of the characteristic mode) of the reference floor 10, and the longitudinal current is the resonant current of the characteristic mode of the reference floor 10. The radiator 20 serves as a radiation driving unit, and the size of the radiator 20 can be reduced to 1 / 8 wavelength. The size of the radiator 20 is reduced by more than 20% compared with the conventional 1 / 4 wavelength antenna size, and good antenna performance is ensured, the low frequency free space efficiency is improved, the length of the radiator 20 is miniaturized, and good antenna performance is ensured.

[0144] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application, and these improvements and refinements are also considered as the protection scope of the present application.

Claims

1. An electronic device, comprising: The electronic device comprises: a reference ground plate comprising a first reference ground edge, a third reference ground edge, a second reference ground edge and a fourth reference ground edge connected in sequence, the length of the first reference ground edge being greater than the length of the third reference ground edge; a radiator comprising a first radiation section and a second radiation section, the first radiation section and the second radiation section being arranged along the first reference ground edge, the first radiation section and the second radiation section being arranged spaced apart from the first reference ground edge, the first radiation section comprising a first free end and a first ground end arranged opposite to each other, the second radiation section comprising a second free end and a second ground end arranged opposite to each other, the first free end and the second free end being insulated from each other, the first ground end and the second ground end being electrically connected to a current strong area of a characteristic mode current of the reference ground plate; and a signal source, a signal end of the signal source being electrically connected to the first radiation section, a ground end of the signal source being electrically connected to the second radiation section, the signal source being configured to excite a loop current on the first radiation section, the reference ground plate and the second radiation section, and the loop current being configured to excite a target resonant mode supporting a target frequency band on the reference ground plate, the target resonant mode having a resonant current mainly distributed along the first reference ground edge, the distance between the current strong area of the characteristic mode current of the reference ground plate and the third reference ground edge being greater than or equal to 1 / 4 of the length of the first reference ground edge, and the distance between the current strong area of the characteristic mode current of the reference ground plate and the fourth reference ground edge being greater than or equal to 1 / 4 of the length of the first reference ground edge. The characteristic mode current of the reference ground plate comprises a first current weak area, the current strong area and a second current weak area along the first reference ground edge in sequence, the intensity of the resonant current of the target resonant mode in the current strong area being greater than the intensity of the resonant current of the target resonant mode in the first current weak area, and the intensity of the resonant current of the target resonant mode in the current strong area being greater than the intensity of the resonant current of the target resonant mode in the second current weak area.

2. The electronic device of claim 1, wherein, The target resonant mode corresponds to a 1 / 2 wavelength mode.

3. The electronic device of claim 1, wherein, The length of the radiator is less than 1 / 4 wavelength of the target frequency band, and the length of the radiator is greater than or equal to 1 / 10 wavelength of the target frequency band.

4. The electronic device of claim 1, wherein, The electronic device further comprises a matching circuit, the matching circuit comprising at least one capacitive element, one end of the capacitive element being electrically connected to the signal end of the signal source, and the other end of the capacitive element being electrically connected to the first radiation section.

5. The electronic device of claim 4, wherein, The number of the capacitive elements is multiple, and the multiple capacitive elements are connected in parallel between the signal end of the signal source and the first radiation section.

6. The electronic device of claim 5, wherein, The matching circuit further comprises a switching unit, the switching unit being electrically connected between the multiple capacitive elements and the signal end of the signal source, and the switching unit being configured to switch the on-off state between the multiple capacitive elements and the signal end of the signal source, so as to switch a sub-frequency band of the target frequency band. ​ 7. The electronic device of claim 6, wherein, The matching circuit further comprises a matching element, one end of the matching element is electrically connected between the signal end of the signal source and the switching unit, and the other end of the matching element is grounded.

8. The electronic device of claim 7, wherein, The electronic device further comprises an antenna circuit board and a radio frequency connecting seat arranged on the antenna circuit board, the matching circuit is arranged on the antenna circuit board, the radio frequency connecting seat is electrically connected between the matching circuit and the signal end of the signal source, and the antenna circuit board further comprises a reference ground layer, the reference ground layer is electrically connected between the ground end of the signal source and the second radiation section.

9. The electronic device of claim 8, wherein, The electronic device further comprises a support table integrally formed with the second radiation section, the support table is fixedly connected to the antenna circuit board, and the second radiation section, the support table and the reference ground layer of the antenna circuit board are sequentially electrically connected.

10. The electronic device of claim 9, wherein, The support table and the signal source are arranged on the same side of the second radiation section, and the support table is connected to the second free end.

11. The electronic device of claim 9, wherein, The electronic device further comprises a conductive protrusion and a conductive spring piece, the conductive protrusion is protruded on the first radiation section, the conductive protrusion is connected to the first free end, and the conductive protrusion and the support table are located on the same side of the radiator; The conductive spring piece is arranged on the antenna circuit board, one end of the conductive spring piece is electrically connected to the matching circuit, and the other end of the conductive spring piece abuts against the conductive protrusion.

12. The electronic device of any of claims 1-11, wherein, The insulating gap is located in the 1 / 4-3 / 4 section of the radiator.

13. The electronic device of any of claims 1-11, wherein, The target frequency band is an LB frequency band.

14. The electronic device of any of claims 1-11, wherein, The electronic device comprises a frame, the frame comprises a top edge, a first side edge, a bottom edge and a second side edge which are sequentially connected, the top edge and the bottom edge are a pair of short edges, the first side edge and the second side edge are a pair of long edges, and the size of the long edges is greater than the size of the short edges. The reference ground plate is arranged in the frame, the first reference ground edge is opposite to the first side edge, the second reference ground edge is opposite to the second side edge, the radiator is a part of the first side edge, and the signal source is arranged in a space surrounded by the frame.

15. The electronic device of claim 14, wherein, The electronic device further comprises a circuit board, the circuit board and the support table on the second radiation section are oppositely and spacedly arranged in the thickness direction of the electronic device, the support table is used for supporting the matching circuit of the electronic device and is integrally formed with the second radiation section, and the space between the circuit board and the support table is used for arranging electronic devices. The signal source is arranged on the circuit board, the signal source is arranged adjacent to the support table, and the antenna circuit board on the support table is electrically connected to the signal end of the signal source and the ground end of the signal source.

16. The electronic device of claim 14, wherein, The radiator is arranged beside a battery of the electronic device, the support table on the second radiation section and the battery are oppositely and spacedly arranged in the thickness direction of the electronic device, and the support table is used for supporting the matching circuit of the electronic device and electrically connecting the ground end of the signal source.

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