Electronic device

Abstract

According to the electronic equipment, a side frame of a frame comprises a transverse screen free area and two transverse screen holding areas arranged on the two sides of the transverse screen free area respectively, the transverse screen holding areas are the areas, held by the hand when the transverse screen is held, on the side frame, and the transverse screen free area is the area, not held by the hand when the transverse screen is held, on the side frame; the antenna assembly comprises at least one first radiator and a first signal source, each first radiator comprises a first radiation section and a second radiation section which are connected, the first radiation section is arranged in a transverse screen holding area, one end, deviating from the first radiation section, of the second radiation section is a free end, and the second radiation section is arranged in a transverse screen free area; the first signal source is electrically connected with the first radiator, the first signal source is used for exciting the first radiator to form a first resonance mode supporting a first frequency band, and an electric field formed by the first radiation section in the first resonance mode excites a hand to participate in radiation during transverse screen holding. The problem of antenna performance reduction can be improved, and the antenna performance is improved.

Description

Technical Field

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

[0002] Mobile phones and other electronic devices are often used in handheld scenarios. Human hands will have a certain impact on the performance of the antenna of mobile phones and other electronic devices, and even the antenna will be in a state of being held tightly, in which case the antenna performance is basically 0. Therefore, how to improve the problem of antenna performance degradation in handheld situations and improve antenna performance has become a technical problem that needs to be solved. Summary of the invention

[0003] The present application provides an electronic device for improving the problem of antenna performance degradation to enhance antenna performance.

[0004] An electronic device provided in an embodiment of the present application includes a frame and an antenna assembly, wherein the frame includes a top frame, a bottom frame and a pair of side frames connected between the top frame and the bottom frame, each of the side frames includes a horizontal screen free area and two horizontal screen holding areas respectively arranged on both sides of the horizontal screen free area, the horizontal screen holding area is an area on the side frame that is held by the hand when the screen is held in horizontal mode, and the horizontal screen free area is an area on the side frame that is not held by the hand when the screen is held in horizontal mode;

[0005] The antenna assembly includes at least one first radiator and a first signal source, each of the first radiators includes a first radiating section and a second radiating section that are connected, the first radiating section is arranged in the horizontal screen holding area, the end of the second radiating section that is away from the first radiating section is a free end, and the second radiating section is arranged in the horizontal screen free area; the first signal source is electrically connected to the first radiator, and the first signal source is used to excite the first radiator to form a first resonant mode that supports a first frequency band, and the electric field formed by the first radiating section under the first resonant mode excites the hand to participate in radiation when the screen is held horizontally.

[0006] The electronic device provided by the present application includes a frame and an antenna assembly, wherein the frame includes a top frame, a bottom frame and a pair of side frames arranged back to back, each side frame includes a horizontal screen free area and two horizontal screen holding areas respectively arranged on both sides of the horizontal screen free area, the horizontal screen holding area is an area on the side frame that is held by the hand when the screen is held in horizontal mode, and the horizontal screen free area is an area on the side frame that is not held by the hand when the screen is held in horizontal mode; the antenna assembly includes at least one first radiator and a first signal source, each first radiator includes a first radiating section and a second radiating section connected to each other, the first radiating section is arranged at the horizontal screen holding area, and the horizontal screen holding area is arranged at the horizontal screen holding area. Zone, so that the first radiating segment is held by the hand when the screen is held in landscape mode, the end of the second radiating segment away from the first radiating segment is a free end, and the second radiating segment is arranged in the landscape free zone, so that the free end of the second radiating segment is not held by the hand when the screen is held in landscape mode, thereby reducing the hand's absorption of antenna radiation; the first signal source is electrically connected to the first radiator, and the first signal source is used to excite the first radiator to form a first resonance mode that supports the first frequency band. The electric field formed by the first radiating segment under the first resonance mode excites the hand to participate in radiation when the screen is held in landscape mode, so as to improve the efficiency of the first frequency band, improve the problem of antenna performance degradation, and thus improve the antenna performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] 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.

[0008] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0009] Figure 2 yes Figure 1 A partially exploded schematic diagram of the provided electronic device;

[0010] Figure 3 is a structural schematic diagram of a middle frame and an antenna assembly provided in an embodiment of the present application;

[0011] Figure 4 is a schematic diagram of the electronic device provided by the present application when held in landscape mode;

[0012] Figure 5 yes Figure 3 A schematic diagram of the structure of the antenna assembly;

[0013] Figure 6 yes Figure 3 The near-field electric field diagram of the first radiator when it is working;

[0014] Figure 7 This is a performance comparison of the first sub-radiator provided in the embodiment of the present application working alone in the free space of the B8 frequency band and when held horizontally with both hands;

[0015] Figure 8is a structural schematic diagram of an antenna assembly provided in an embodiment of the present application, including a first sub-radiator and a second sub-radiator;

[0016] Fig. 9 yes Figure 8 A current distribution diagram of a first sub-radiator in the provided antenna assembly when it resonates under an excitation signal of a first phase;

[0017] Fig.10 yes Figure 8 A current distribution diagram of the provided antenna assembly when it resonates under an excitation signal of a second phase;

[0018] Fig.11 yes Figure 8 A current distribution diagram of a first sub-radiator and a second sub-radiator in a provided antenna assembly in a co-feed mode;

[0019] Fig.12 yes Figure 8 A schematic diagram of the structure of the first feeding network in FIG.

[0020] Fig.13 This is a performance comparison of the first sub-radiator and the second sub-radiator provided in the embodiment of the present application working together in the free space and the horizontal holding of both hands in the B28 (703MHz~804MHz) and B8 (880MHz~960MHz) frequency bands;

[0021] Fig.14 is a structural schematic diagram of an antenna assembly provided by an embodiment of the present application further comprising a first switch unit;

[0022] Fig.15 is a schematic structural diagram of an antenna assembly provided in an embodiment of the present application, including two first sub-radiators and two second sub-radiators;

[0023] Fig.16 It is a structural schematic diagram of an antenna assembly provided in an embodiment of the present application, including a first switch switching circuit and a second switch switching circuit;

[0024] Fig.17 is a structural schematic diagram of a first switch switching circuit provided in an embodiment of the present application;

[0025] Fig.18a is a schematic diagram of an electronic device provided by an embodiment of the present application when the left hand holds the screen vertically;

[0026] Fig.18b is a schematic diagram of an electronic device provided by an embodiment of the present application when the screen is held vertically in the right hand;

[0027] Fig.19 It is a structural schematic diagram of the antenna assembly provided in an embodiment of the present application further including a second radiator;

[0028] Fig. 20 yes Fig.19 A current distribution diagram of a third sub-radiator in the provided antenna assembly under an excitation signal of a third phase;

[0029] Fig.21 yes Fig.19 A current distribution diagram of a fourth sub-radiator in the provided antenna assembly under an excitation signal of a fourth phase;

[0030] Fig. 22 yes Fig.19 A current distribution diagram of the third sub-radiator and the fourth sub-radiator in the provided antenna assembly in a common feeding mode;

[0031] Fig.23 yes Fig.19 A schematic diagram of the structure of a second feeding network in the provided antenna assembly;

[0032] Fig.24 It is a schematic diagram of a structure in which power is fed through a first inductor element and a second inductor element in an antenna assembly provided in an embodiment of the present application;

[0033] Fig.25 It is a structural schematic diagram of a sixth transmission line in an antenna assembly provided by an embodiment of the present application being electrically connected to a fourth transmission line and a fifth transmission line through a third switch unit;

[0034] Fig.26 It is a structural schematic diagram of an antenna assembly provided in an embodiment of the present application, including a first switch switching circuit and a second switch switching circuit;

[0035] Fig. 27 is a near-field electric field distribution diagram of a second radiator in an antenna assembly provided in an embodiment of the present application;

[0036] Fig.28 This is a scene diagram of holding an electronic device with a left hand provided in an embodiment of the present application;

[0037] Fig.29 yes Fig.21 Comparison of S11 parameter curves of the first antenna working alone, the second antenna working alone and the co-feed antenna;

[0038] Fig.30 yes Fig.21 The radiation performance curves of the first antenna working alone in the B28 frequency band, the second antenna working alone in the B28 frequency band, and the co-feed antenna working in the B28 frequency band are compared;

[0039] Fig.31 yes Fig.21 Comparison of the efficiency of the common-feed antenna in the left-hand holding scenario, right-hand holding scenario and free space in the B28 frequency band;

[0040] Fig.32 yes Fig.21 Comparison of the efficiency of the common-feed antenna in the left-hand holding scenario, right-hand holding scenario and free space in the B8 frequency band.

[0041] Description of Figure Numbers:

[0042] Electronic device 1000; antenna assembly 100; reference floor 600; display screen 200; middle frame 300; back cover 400; middle plate 310; frame 320; top frame 321; bottom frame 322; first side frame 323; second side frame 324; first radiator 10; first radiating section 101; second radiating section 102; first sub-radiator 11; first grounding point D1; first feeding point C1; first free end A1; second sub-radiator 12; first feeding network 20; first feeding point C1; second feeding point F1; first signal source 30; first transmission line 202; second transmission line 203; third transmission line 204; first matching circuit M1; second matching circuit M2; first switch switching circuit T1; second switch switching circuit T2; first sub-switch T11; multiple first switching branches T12 ; second radiator 40; second signal source 60; second feeding network 50; third sub-radiator 41; fourth sub-radiator 42; third grounding point D2; third feeding point C2; third free end A2; fourth grounding point E2; fourth feeding point F2; fourth free end H2; first reference ground edge 610; second reference ground edge 620; third reference ground edge 630; fourth reference ground edge 640; fourth transmission line 502; fifth transmission line 503; sixth transmission line 504; first inductor element L1; second inductor element L2; third inductor element L3; fourth inductor element L4; third matching circuit M3; fourth matching circuit M4; third switch unit K3; third switch switching circuit T3; third connection point B2; fourth switch switching circuit T4; fourth connection point G2; third sub-switch T31; third switching branch T32. DETAILED DESCRIPTION

[0043] 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 the field without creative work are within the scope of protection of the present application.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] See also Figure 2 , the electronic device 1000 includes an antenna assembly 100. The antenna assembly 100 can improve antenna efficiency.

[0048] 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. The frame 320 may be a conductive frame. 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.

[0049] See also Figure 3The frame 320 includes a top frame 321 and a bottom frame 322 that are arranged opposite to each other, and a pair of side frames connected to the top frame 321 and the bottom frame 322. The pair of side frames includes a first side frame 323 and a second side frame 324. The top frame 321 is the side away from the ground when the user holds the electronic device 1000, and the bottom frame 322 is the side facing the ground when the user holds the electronic device 1000. The first side frame 323 is the left side frame when the user holds the electronic device 1000. The second side frame 324 is the right side frame when the user holds the electronic device 1000.

[0050] Each of the side frames includes a horizontal screen free zone Z2 and two horizontal screen holding zones Z1 respectively arranged on both sides of the horizontal screen free zone Z2. The direction from the top frame 321 to the bottom frame 322 is respectively recorded as the horizontal screen holding zone Z1, the first horizontal screen free zone Z2, and the horizontal screen holding zone Z1.

[0051] See also Figure 4 , Figure 4 It is a structural diagram of the electronic device 1000 when held horizontally with both hands (USB facing right). The horizontal screen holding area Z1 is the area on the side frame (the first side frame 323 or the second side frame 324) that is held by the hand when the screen is held horizontally. The horizontal screen free area Z2 is the area on the side frame (the first side frame 323 or the second side frame 324) that is not held by the hand when the screen is held horizontally. The present application does not make specific restrictions on the size of the horizontal screen holding area Z1. Optionally, the length of the horizontal screen holding area Z1 along the side frame is about 30-40mm. Furthermore, the horizontal screen holding area Z1 close to the top frame 321 is an area less than or equal to 40mm from the top frame 321. The horizontal screen holding area Z1 close to the bottom frame 322 is an area less than or equal to 40mm from the bottom frame 322. The first horizontal screen free area Z2 is the area between the two horizontal screen holding areas.

[0052] See also Figure 3 and Figure 5 The antenna assembly 100 includes at least one first radiator 10 and a first signal source 30 .

[0053] 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.

[0054] 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 5The 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.

[0055] 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. The embodiment of the present application takes the first radiator 10 as a part of the metal frame 320 as an example.

[0056] See also Figure 3 and Figure 5 Each of the first radiators 10 includes a first radiating section 101 and a second radiating section 102 that are connected.

[0057] The first radiation section 101 is disposed in the horizontal screen holding zone Z1. The first radiation section 101 is held by a hand when the screen is held horizontally.

[0058] See also Figure 6 , Figure 6 is the near-field electric field distribution of the first radiator 10 when it resonates. Figure 6 The arrow in represents the direction of the near-field electric field outside the first radiator 10. Figure 6 It can be seen that when the first radiator 10 is resonating, the electric field outside the first radiator 10 is a vertical electric field. The direction of the near-field electric field is perpendicular to the extension direction of the first radiator 10 .

[0059] Since the human hand can be equivalent to an object with high dielectric constant, low conductivity and high dielectric loss. When the vertical electric field excites the high dielectric constant object (hand), the object (hand) has a certain radiation capacity. When the radiation capacity of the hand is greater than its loss capacity, the hand can radiate as an effective radiator. Figure 4 In the horizontal holding scenario with both hands, since the hands hold the first radiation section 101 , the vertical electric field near the first radiation section 101 can stimulate the fingers to radiate, so as to improve the radiation efficiency of the first radiator 10 .

[0060] The end of the second radiation section 102 that is away from the first radiation section 101 is a free end, wherein the free end is an end adjacent to the gap.

[0061] The second radiation section 102 is arranged in the horizontal screen free zone Z2. When a resonant current is formed on the first radiator 10, the gap at the free end is a parallel electric field, which is easily absorbed by the human body, resulting in a sharp drop in efficiency. Therefore, by arranging the second radiation section 102 in the horizontal screen free zone Z2, the free end of the second radiation section 102 is prevented from being held by the hand when the screen is held horizontally, thereby preventing the hand from absorbing the parallel electric field at the gap at the free end, thereby ensuring that the antenna has good performance.

[0062] The first signal source 30 is electrically connected to the first radiator 10. The first signal source 30 is used to excite the first radiator 10 to form a first resonance mode supporting a first frequency band.

[0063] Optionally, the first signal source 30 includes but is not limited to a radio frequency transceiver chip or a port electrically connected to a radio frequency transceiver chip.

[0064] The present application does not limit the specific frequency band of the first frequency band. For example, 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. The present application takes the LB frequency band as an example.

[0065] The electrical connection between the first signal source 30 and the first radiator 10 includes but is not limited to direct electrical connection or coupled electrical connection. The connection medium of the direct electrical connection includes but is not limited to conductive springs, radio frequency connection wires, conductive thimbles, and the like.

[0066] The first resonance mode includes but is not limited to a 1 / 4 wavelength mode of the first frequency band, a 1 / 2 wavelength mode of the first frequency band, and the like.

[0067] The electric field formed by the first radiation segment 101 in the first resonance mode stimulates the hand to participate in radiation when the electronic device 1000 is held in landscape mode, so as to improve the efficiency of the first frequency band of the electronic device 1000 when the electronic device 1000 is held in landscape mode.

[0068] The electronic device 1000 provided in the present application includes a frame 320 and an antenna assembly 100, each side frame of the frame 320 includes a horizontal screen free area Z2 and two horizontal screen holding areas Z1 respectively arranged on both sides of the horizontal screen free area Z2, the horizontal screen holding area Z1 is an area on the side frame that is held by the hand when the screen is held in horizontal mode, and the horizontal screen free area Z2 is an area on the side frame that is not held by the hand when the screen is held in horizontal mode; the antenna assembly 100 includes at least one first radiator 10 and a first signal source 30, each first radiator 10 includes a first radiating section 101 and a second radiating section 102 connected to each other, the first radiating section 101 is arranged in the horizontal screen holding area Z1, so that the first The radiating section 101 is held by the hand when the screen is held in landscape mode, and the end of the second radiating section 102 facing away from the first radiating section 101 is a free end. The second radiating section 102 is arranged in the landscape free zone Z2, so that the free end of the second radiating section 102 is not held by the hand when the screen is held in landscape mode, thereby reducing the hand's absorption of antenna radiation; the first signal source 30 is electrically connected to the first radiator 10, and the first signal source 30 is used to excite the first radiator 10 to form a first resonance mode that supports the first frequency band. The electric field formed by the first radiating section 101 in the first resonance mode excites the hand to participate in radiation when the screen is held in landscape mode, so as to improve the efficiency of the electronic device 1000 in the first frequency band when the screen is held in landscape mode.

[0069] See also Figure 5 , at least one of the first radiators 10 includes at least one first sub-radiator 11. When there is one first radiator 10, the first radiator 10 is recorded as a first sub-radiator 11.

[0070] The first radiation section 101 of the first sub-radiator 11 is arranged in the horizontal screen holding area Z1 adjacent to the top frame 321. The first sub-radiator 11 also includes a third radiation section 103. The third radiation section 103 is connected to the end of the first radiation section 101 of the first sub-radiator 11 away from the second radiation section 102 of the first sub-radiator 11. The third radiation section 103 is arranged in the top frame 321. In other words, the first sub-radiator 11 is L-shaped. A part of the first sub-radiator 11 is arranged in the side frame, and the other part is arranged in the top frame 321. The third radiation section 103 can be set to a back-to-ground position so that the back-to-ground position of the first sub-radiator 11 is not wrapped by the palm when the screen is held in the horizontal position.

[0071] Of course, in other embodiments, for example, the resonance frequency band supported by the first sub-radiator 11 is a medium-high frequency. The first sub-radiator 11 does not include the third radiation section 103. The first sub-radiator 11 is entirely disposed on the side frame.

[0072] When the first sub-radiator 11 provided in this embodiment is held in landscape mode, the first radiation section 101 stimulates the hand to radiate, the second radiation section 102 is not held by the hand to prevent the hand from being held tightly, and the third radiation section 103 is arranged on the top frame 321. A back-to-ground position can be set on the third radiation section 103 to prevent the back-to-ground position of the third radiation section 103 from being wrapped by the palm, so as to prevent the radiation energy of the antenna from being largely absorbed in the B8 frequency band (0.88-0.96GHz). The above improves the antenna performance of the antenna assembly 100 when the electronic device 1000 is held in landscape mode.

[0073] See also Figure 3 , the electronic device 1000 also includes a reference floor 600 disposed in the frame 320. Optionally, the reference floor 600 is roughly rectangular in shape, wherein the reference ground edge of the reference floor 600 includes but is not limited to a straight edge or a regular edge. Because devices are set up in the mobile phone as needed or other structures are avoided, various grooves, holes, etc. are opened on the reference ground edge of the reference floor 600. The reference floor 600 includes but is not limited to the metal alloy part of the middle plate 310 and the reference ground metal part of the circuit board (including the main board and the sub-board). Roughly speaking, the reference ground system in the electronic device 1000 can be equivalent to a rough rectangle, so it is called the reference floor 600. Among them, the reference floor 600 does not indicate that the shape of the reference ground is plate-like and is a rectangular plate.

[0074] See also Figure 3 The first sub-radiator 11 includes a first grounding point D1, a first feeding point C1 and a first free end A1 which are arranged in sequence.

[0075] The first grounding point D1 is electrically connected to the reference ground 600, and the electrical connection method includes but is not limited to interconnection by physical contact, or indirect methods such as coaxial lines, microstrip lines, conductive springs, and conductive adhesives. In this embodiment, the first grounding point D1 can be directly short-circuited and electrically connected to the reference ground, or electrically connected to the reference ground through a small inductor. Among them, the first free end A1 is an end disconnected from other conductive structures. Of course, insulating material can be filled between the first free end A1 and other conductive structures to ensure the firmness of the connection between the first sub-radiator 11 and other conductive structures.

[0076] The first sub-radiator 11 forms a first resonance mode supporting the first frequency band under the feeding of the first signal source 30 alone, and this mode is a single-feed mode.

[0077] Optionally, the electrical length from the first ground point D1 to the first free end A1 of the first sub-radiator 11 is close to 1 / 4 wavelength of the center frequency of the first frequency band. The excitation signal of the first signal source 30 forms a resonance in the first sub-radiator 11, the frequency of the resonance on the first sub-radiator 11 is the center frequency of the first frequency band, and the mode of the resonance on the first sub-radiator 11 is the 1 / 4 wavelength mode of the first frequency band.

[0078] See also Figure 7 , Figure 7 It is a performance comparison of the first sub-radiator 11 working alone in the free space of the B8 frequency band and with both hands held horizontally. Curve a1 is the radiation efficiency of the first sub-radiator working alone in the B8 frequency band with both hands held horizontally. Curve b1 is the radiation efficiency of the first sub-radiator working alone in the free space of the B8 frequency band. Curve a2 is the system efficiency of the first sub-radiator working alone in the B8 frequency band with both hands held horizontally. Curve b2 is the system efficiency of the first sub-radiator working alone in the free space of the B8 frequency band. It can be seen that the radiation efficiency of the first sub-radiator 11 working alone in the free space of the B8 frequency band is -7.4dB; the radiation efficiency of the first sub-radiator 11 working alone in the B8 frequency band with both hands held horizontally is -6.4dB. The system efficiency of the first sub-radiator 11 working alone in the free space of the B8 frequency band is -9.1dB; the system efficiency of the first sub-radiator 11 working alone in the B8 frequency band with both hands held horizontally is -7.3dB. The system efficiency of the first sub-radiator 11 working alone in the B8 frequency band from free space to both hands held horizontally is greatly improved.

[0079] See also Figure 8 , at least one of the first radiators 10 further includes at least one second sub-radiator 12. Optionally, the number of the first radiators 10 is two, which are respectively recorded as a first sub-radiator 11 and a second sub-radiator 12.

[0080] See also Figure 8 , the first radiation section 101 of the second sub-radiator 12 is arranged in the horizontal screen holding area Z1 adjacent to the bottom frame 322. The second radiation section 102 of the second sub-radiator 12 is arranged at an interval with the second radiation section 102 of the first sub-radiator 11. The second sub-radiator 12 also includes a fourth radiation section 104. The fourth radiation section 104 is connected to the end of the first radiation section 101 of the second sub-radiator 12 away from the second radiation section 102 of the second sub-radiator 12. The fourth radiation section 104 is arranged on the bottom frame 322. In other words, the second sub-radiator 12 is L-shaped. A part of the second sub-radiator 12 is arranged on the side frame, and the other part is arranged on the bottom frame 322. A return position can be set on the fourth radiation section 104 so that the return position of the second sub-radiator 12 is not wrapped by the palm when the screen is held in the horizontal position.

[0081] Of course, in other embodiments, for example, the resonant frequency band supported by the second sub-radiator 12 is a medium-high frequency. The second sub-radiator 12 does not include the fourth radiation section 104. The entire second sub-radiator 12 is disposed on the side frame.

[0082] When the second sub-radiator 12 provided in this embodiment is held in landscape mode, the first radiation section 101 stimulates the hand to radiate, and the second radiation section 102 is not held by the hand to avoid the hand being held tightly. The fourth radiation section 104 is arranged on the bottom frame 322, and a return position can be set on the fourth radiation section 104 to avoid the return position of the fourth radiation section 104 being wrapped by the palm, so as to avoid the radiation energy of the antenna being absorbed to a large extent in the B8 frequency band (0.88-0.96GHz). The above improves the antenna performance of the antenna assembly 100 when the electronic device 1000 is held in landscape mode.

[0083] The material, form and shape of the second sub-radiator 12 may refer to the material, form and shape of the first sub-radiator 11. In this embodiment, the first sub-radiator 11 and the second sub-radiator 12 are taken as a part of the metal frame 320 of the electronic device 1000.

[0084] See also Figure 8 , the second sub-radiator 12 includes a second grounding point E1, a second feeding point F1 and a second free end H1 which are arranged in sequence. The second free end H1 and the first free end A1 are arranged on the same side frame and are spaced apart. The second grounding point E1 is electrically connected to the reference ground 600, and the electrical connection method includes but is not limited to interconnection as a whole by physical contact, or indirect methods such as coaxial lines, microstrip lines, conductive springs, and conductive adhesives. In this embodiment, the second grounding point E1 can be directly short-circuited to electrically connect to the reference ground, or can be electrically connected to the reference ground through a small inductor. Among them, the second free end H1 is an end that is disconnected from other conductive structures. Of course, insulating material can be filled between the second free end H1 and other conductive structures to ensure the firmness of the connection between the second sub-radiator 12 and other conductive structures.

[0085] See also Figure 8 The antenna assembly 100 further includes a first feeding network 20. The first feeding network 20 is electrically connected to the first feeding point C1, the second feeding point F1 and the first signal source 30. The electrical connection method includes but is not limited to the electrical connection method of the conductive spring.

[0086] See also Figure 8, the first signal source 30 provides an excitation signal of a first phase to the first sub-radiator 11 via the first feeding network 20 and the first feeding point C1. The first signal source 30 also provides an excitation signal of a second phase to the second sub-radiator 12 via the first feeding network 20 and the second feeding point F1. Wherein, the excitation signal is a radio frequency current signal. The excitation signal of the first phase is transmitted to the first sub-radiator 11 via the first feeding point C1, and a resonance of a corresponding frequency point is formed on the first sub-radiator 11, and the resonance can realize the reception and transmission of electromagnetic waves within a certain frequency band. The excitation signal of the second phase is transmitted to the second sub-radiator 12 via the second feeding point F1, and a resonance of a corresponding frequency point is formed on the second sub-radiator 12, and the resonance can realize the reception and transmission of electromagnetic waves within a certain frequency band.

[0087] The first phase and the second phase may be the same or different.

[0088] The first feeding network 20 provides an excitation signal of a first phase to the first sub-radiator 11 and provides an excitation signal of a second phase to the second sub-radiator 12, so as to excite the first sub-radiator 11 and the second sub-radiator 12 to jointly form a second resonance mode supporting the first frequency band. The main current formed on the reference floor 600 by the second resonance mode is a longitudinal current distributed along the length direction of the reference floor 600.

[0089] The first sub-radiator 11 and the second sub-radiator 12 jointly form a second resonance mode supporting the first frequency band under the feeding of the first signal source 30 , and this mode is a double-feed mode.

[0090] Optionally, the electrical length from the first ground point D1 to the first free end A1 of the first sub-radiator 11 is close to 1 / 4 wavelength of the center frequency of the first frequency band. The excitation signal of the first phase forms a resonance on the first sub-radiator 11, the frequency of the resonance on the first sub-radiator 11 is the center frequency of the first frequency band, and the mode of the resonance on the first sub-radiator 11 is the 1 / 4 wavelength mode of the first frequency band.

[0091] The electrical length described in this application can satisfy the following formula:

[0092]

[0093] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in a free scene.

[0094] Furthermore, the electrical length from the second grounding point E1 to the second free end H1 of the second sub-radiator 12 is close to 1 / 4 wavelength of the center frequency of the first frequency band. The excitation signal of the second phase forms a resonance in the second sub-radiator 12, the frequency of the resonance on the second sub-radiator 12 is the center frequency of the first frequency band, and the mode of the resonance on the second sub-radiator 12 is the 1 / 4 wavelength mode of the first frequency band.

[0095] The resonant mode on the first sub-radiator 11 and the resonant mode on the second sub-radiator 12 synthesize the second resonant mode. In other words, the second resonant mode includes a 1 / 4 wavelength mode supporting the first frequency band formed between the first free end A1 and the first grounding point D1 and a 1 / 4 wavelength mode supporting the first frequency band formed between the second free end H1 and the second grounding point E1. The current of the second resonant mode includes a first resonant current between the first free end A1 and the first grounding point D1 and a second resonant current between the second grounding point E1 and the second free end H1, wherein the first resonant current and the second resonant current have the same direction, so that the first resonant current and the second resonant current flow toward the reference floor 600, and the main current formed on the reference floor 600 is a longitudinal current in the same direction. The longitudinal direction is the direction along the side frame of the frame 320.

[0096] Since the reference floor 600 is made of a conductive material, the reference floor 600 is equivalent to a "radiation plate" with a certain size in the width direction, and the reference floor 600 can also provide radiation contribution to the antenna assembly 100. When the first radiator 10 radiates, the stronger the current intensity excited by the first feeding network 20 in the length direction of the reference floor 600, the greater the radiation contribution of the reference floor 600 to the first radiator 10, and the radiation efficiency of the first radiator 10 can be further improved.

[0097] Taking the electronic device 1000 as a mobile phone as an example, the length dimension of the reference floor 600 is about 15-17 cm, and the longitudinal current of the reference floor 600 in the length direction has a more obvious effect on improving the efficiency of the low-frequency band. Optionally, when the electronic device 1000 is a mobile phone, the first frequency band can be a low-frequency band, or a GPS-L1 band, etc.

[0098] Optional, see Figure 3, the edge of the reference floor 600 includes a first reference ground edge 610, a second reference ground edge 620, a third reference ground edge 630 and a fourth reference ground edge 640 which are bent and connected in sequence. The reference floor 600 is located in the space surrounded by the frame 320. Among them, the first reference ground edge 610 is located on the inner side of the first side frame 323, and the second reference ground edge 620 and the inner side of the bottom frame 322. The third reference ground edge 630 is located on the inner side of the second side frame 324, and the fourth reference ground edge 640 is located on the inner side of the top frame 321. The first reference ground edge 610 and the third reference ground edge 630 are the edges in the length direction of the reference floor 600. The second reference ground edge 620 and the fourth reference ground edge 640 are the edges in the width direction of the reference floor 600.

[0099] See also Figure 3 Optionally, most of the first sub-radiator 11 is arranged along the edge of the reference floor 600 in the length direction, for example, the first reference ground edge 610. Most of the second sub-radiator 12 is arranged along the edge of the reference floor 600 in the length direction, for example, the first reference ground edge 610. When the first radiator 10 is arranged along the edge of the reference floor 600 in the length direction, more current can be stimulated on the edge of the reference floor 600 in the length direction, that is, more longitudinal current can be stimulated. The longitudinal current on the reference floor 600 can improve the far-field radiation energy of the first radiator 10, thereby improving the radiation efficiency of the first radiator 10.

[0100] By setting the first phase of the excitation signal fed into the first sub-radiator 11 and the second phase of the excitation signal fed into the second sub-radiator 12, it is achieved that most of the current after the first floor current and the second floor current are superimposed and offset is the longitudinal current distributed along the length direction of the reference floor 600, and a very small part or basically no current is the transverse current along the width direction of the reference floor 600. In this way, the main current formed on the reference floor 600 in the second resonant mode is the longitudinal current distributed along the length direction of the reference floor 600.

[0101] Optionally, the difference between the first phase and the second phase is a preset phase difference, so that the second resonance mode forms the longitudinal current (in the length direction of the reference floor 600 ) on the reference floor 600 .

[0102] The present application does not make any specific limitation on the preset phase difference. Under the preset phase difference, the main current on the reference floor 600 is the longitudinal current.

[0103] Optionally, the first sub-radiator 11 and the second sub-radiator 12 are mirror-symmetrical structures, and the preset phase difference is 180°±20°.

[0104] Since the first sub-radiator 11 and the second sub-radiator 12 are mirror-symmetrical structures, the current formed by the first sub-radiator 11 on the reference floor in the single-feed mode is also mirror-symmetrical to the current formed by the second sub-radiator 12 on the reference floor in the single-feed mode. By setting the preset phase difference between the first sub-radiator 11 and the second sub-radiator 12 in the dual-feed mode to be close to 180°, optionally, the preset phase difference between the first sub-radiator 11 and the second sub-radiator 12 in the dual-feed mode is 180°±20°, so that the first floor current and the second floor current are constructively superimposed along the length direction of the reference floor and cancel each other out along the width direction of the reference floor. The main current formed on the reference floor 600 by the second resonant mode is the longitudinal current distributed along the length direction of the reference floor 600, while the transverse current in the width direction is very small, which effectively excites the current in the direction of the longer dimension on the reference floor 600, obtains higher antenna radiation efficiency and improves the working bandwidth.

[0105] See also Fig. 9 and Fig.10 , Fig. 9 and Fig.10 The longer the arrow is, the greater the current intensity is; Fig. 9 and Fig.10 The more arrows in a certain direction or the greater the distribution density, the greater the current intensity in that direction. When the difference between the first phase and the second phase is close to 180°, the direction of the main current in the first floor current formed by the first sub-radiator 11 on the reference floor 600 is vertically downward, and the direction of a small amount of current is horizontally to the left. The direction of the main current in the second floor current formed by the second sub-radiator 12 on the reference floor 600 is vertically downward, and the direction of a small amount of current is horizontally to the right. The intensity of the longitudinal current of the first floor current is greater than the intensity of the transverse current, and the intensity of the longitudinal current of the second floor current is greater than the intensity of the transverse current. The directions of the longitudinal currents in the first floor current and the second floor current are the same, and the directions of the transverse currents are opposite.

[0106] For further information, see Fig.11 , the difference between the first phase and the second phase is 180°, so that the intensity of the longitudinal current of the first floor current is greater than the intensity of the transverse current, and the intensity of the longitudinal current of the second floor current is greater than the intensity of the transverse current. The directions of the longitudinal currents in the first floor current and the second floor current are the same, and the directions of the transverse currents are opposite. Therefore, the transverse current to the left in the first floor current and the transverse current to the right in the second floor current are subtracted and canceled, so that the transverse currents are basically canceled. After the integration of the first floor current and the second floor current, the main current is the vertically downward longitudinal current.

[0107] If the first sub-radiator 11 and the second sub-radiator 12 are non-mirror-symmetric structures, by simulating the floor current under different first phases and second phases, the difference between the first phase and the second phase is adjusted so that the transverse current on the reference floor 600 can be offset as much as possible. In this way, more longitudinal currents are stimulated on the reference floor 600, so that the reference floor 600 participates more in the antenna radiation, which is beneficial to improving the antenna radiation efficiency.

[0108] This application illustrates the specific structure of the antenna assembly 100 with reference to the accompanying drawings.

[0109] In an alternative embodiment, see Fig.12 , the first feeding network 20 includes a first transmission line 202, a second transmission line 203 and a third transmission line 204. One end of the first transmission line 202 is electrically connected to the first feeding point C1. One end of the second transmission line 203 is electrically connected to the second feeding point F1. The other end of the first transmission line 202 is electrically connected to the other end of the second transmission line 203 and one end of the third transmission line 204. The other end of the third transmission line 204 is electrically connected to the first signal source 30.

[0110] In this embodiment, the first signal source 30 is designed to be electrically connected to the first sub-radiator 11 and the second sub-radiator 12 through the first transmission line 202, the second transmission line 203 and the third transmission line 204, so that the first sub-radiator 11 and the second sub-radiator 12 receive signals from the same feed source, and the first sub-radiator 11 and the second sub-radiator 12 are fed in a dual-feed mode. In other words, the excitation signal of the first phase and the excitation signal of the second phase come from the same first signal source 30, and the intensity of the excitation signal of the first phase is the same as or similar to the intensity of the excitation signal of the second phase.

[0111] Of course, in other embodiments, the first transmission line 202 and the second transmission line 203 can be electrically connected to different first signal sources 30 to satisfy that the excitation signal fed into the first feeding point C1 and the excitation signal fed into the second feeding point F1 are respectively the first phase and the second phase, and have equal strength.

[0112] Optionally, the difference between the length of the first transmission line 202 and the length of the second transmission line 203 is a first preset length, so that the phase difference between the first phase and the second phase is the first preset phase difference. In other words, in this embodiment, the excitation signal with the same phase transmitted by the third transmission line 204 is divided into an excitation signal of the first phase and an excitation signal of the second phase through the length difference between the first transmission line 202 and the second transmission line 203.

[0113] The present application does not make any specific limitation on the first preset length. Optionally, the first preset length is determined by a preset phase difference. The first preset length is the wavelength of the first frequency band×(first preset phase difference / 360°).

[0114] Optionally, when the phase difference between the first phase and the second phase is 180°, the length difference between the first transmission line 202 and the second transmission line 203 is 1 / 2 wavelength of the center frequency of the first frequency band.

[0115] The present application determines suitable first phase value and second phase value after simulating the values ​​of the first phase and the second phase at the first feeding point C1 port position of the first sub-radiator 11 and the second feeding point F1 port position of the second sub-radiator 12, determines a first preset phase difference according to the first phase value and the second phase value, determines a first preset length according to the first preset phase difference, and designs the size of the first transmission line 202 and the second transmission line 203 according to the first preset length. The size of the first transmission line 202 and the third transmission line 204 is determined according to the difference between the initial phase of the first signal source 30 and the first phase, so that the excitation signal of the initial phase emitted by the first signal source 30 is transmitted to the first feeding point C1 via the third transmission line 204 and the first transmission line 202, and the excitation signal of the initial phase emitted by the first signal source 30 is transmitted to the second feeding point F1 via the third transmission line 204 and the second transmission line 203, and is an excitation signal of the second phase.

[0116] In this embodiment, the length difference between the first transmission line 202 and the second transmission line 203 is designed to meet the preset phase difference design between the first phase and the second phase, and the design method is simple and effective. By designing the preset phase difference between the first phase and the second phase, the longitudinal currents in the first floor current and the second floor current are in the same direction, and the transverse currents are in opposite directions, so that the transverse currents on the reference floor 600 are offset as much as possible, so that more longitudinal currents are stimulated on the reference floor 600, so that the reference floor 600 participates more in the antenna radiation, which is conducive to improving the antenna radiation efficiency.

[0117] Optional, see Fig.12 , the antenna assembly 100 also includes a first matching circuit M1 and a second matching circuit M2. The first matching circuit M1 is electrically connected between an end of the first transmission line 202 away from the second transmission line 203 and the first feeding point C1. The first matching circuit M1 includes adjusting the impedance matching between the port of the first signal source 30 and the port of the first sub-radiator 11, so that the excitation signal emitted by the first signal source 30 excites a resonant current of a 1 / 4 wavelength mode of the first frequency band on the first sub-radiator 11. Specifically, the first matching circuit M1 includes but is not limited to at least one of a series inductor, a parallel inductor, a parallel capacitor, etc.

[0118] The second matching circuit M2 is electrically connected between one end of the second transmission line 203 away from the first transmission line 202 and the second feeding point F1. The second matching circuit M2 includes adjusting the impedance matching between the port of the first signal source 30 and the port of the second sub-radiator 12, so as to facilitate the excitation signal emitted by the first signal source 30 to excite a resonant current of a 1 / 4 wavelength mode of the first frequency band on the second sub-radiator 12. Specifically, the second matching circuit M2 includes but is not limited to at least one of a series inductor, a parallel inductor, a parallel capacitor, etc.

[0119] Optionally, the first transmission line 202 is a microstrip line or a stripline; and / or, the second transmission line 203 is a microstrip line or a stripline; and / or, the third transmission line 204 is a microstrip line or a stripline. Optionally, the first transmission line 202, the second transmission line 203 and the third transmission line 204 are all microstrip lines; or, the first transmission line 202, the second transmission line 203 and the third transmission line 204 are all striplines, so that the first transmission line 202, the second transmission line 203 and the third transmission line 204 are prepared in the same process.

[0120] In this embodiment, the first transmission line 202, the second transmission line 203, and the third transmission line 204 are designed to be microstrip lines or strip lines, so that the first transmission line 202, the second transmission line 203, and the third transmission line 204 are arranged on a circuit board, thereby reducing the difficulty of preparing the first transmission line 202, the second transmission line 203, and the third transmission line 204 and improving production efficiency.

[0121] Furthermore, the first signal source 30 , the first matching circuit M1 and the second matching circuit M2 are all disposed on a circuit board.

[0122] See also Fig.13 , Fig.13 This is a performance comparison of the first sub-radiator 11 and the second sub-radiator 12 working together in the free space and two-handed horizontal holding of the B28 (703MHz~804MHz) and B8 (880MHz~960MHz) frequency bands. It can be seen that the system efficiency of the first sub-radiator 11 and the second sub-radiator 12 working together in the B28 frequency band with two-handed horizontal holding is -5.7dB; the system efficiency of the first sub-radiator 11 and the second sub-radiator 12 working together in the free space of the B28 frequency band is -5.6dB. The system efficiency of the first sub-radiator 11 and the second sub-radiator 12 working together in the B8 frequency band with two-handed horizontal holding is -5.7dB; the system efficiency of the first sub-radiator 11 and the second sub-radiator 12 working together in the free space of the B8 frequency band is -7dB. It can be seen that in the B28 frequency band, when the first sub-radiator 11 and the second sub-radiator 12 work together, the system efficiency in the two-handed holding scenario (-5.7dB) is basically unchanged compared to the system efficiency in free space (-5.6dB).

[0123] In the B8 frequency band, when the first sub-radiator 11 and the second sub-radiator 12 work together, the system efficiency in the two-handed holding scenario (-5.7dB) is improved by 1.3dB compared with the system efficiency in free space (-7dB).

[0124] contrast Fig.13 and Figure 7 It can be seen that in the B8 frequency band, the system efficiency (-5.7dB) of the first sub-radiator 11 and the second sub-radiator 12 working together when both hands are held horizontally is improved by about 1.6dB compared with the system efficiency (-7.3dB) of the first sub-radiator 11 working alone when both hands are held horizontally.

[0125] contrast Fig.13 and Figure 7 It can be seen that in the B8 frequency band, the system efficiency (-7dB) of the first sub-radiator 11 and the second sub-radiator 12 working together in free space is improved by about 2.1dB compared with the system efficiency (-9.1dB) of the first sub-radiator 11 working alone in free space.

[0126] In one embodiment, see Fig.14 The antenna assembly 100 further includes a first switch unit K1. One end of the first switch unit K1 is electrically connected to one end of the third transmission line 204, and the other end of the first switch unit K1 can be selectively electrically connected to the other end of the first transmission line 202, so that the first sub-radiator 11 works in a single-feed mode; or, the other end of the first switch unit K1 can be selectively electrically connected to the other end of the second transmission line 203, so that the second sub-radiator 12 works in a single-feed mode; or, the other end of the first switch unit K1 can be selectively electrically connected to the other end of the first transmission line 202 and the other end of the second transmission line 203, so that the first sub-radiator 11 and the second sub-radiator 12 work together in a dual-feed mode.

[0127] The first switch unit K1 includes but is not limited to a switch tube, a transistor, a MOS tube, etc. The moving end of the first switch unit K1 can realize that the antenna assembly 100 can have three structural forms by selecting to electrically connect the first transmission line 202 alone, selecting to electrically connect the second transmission line 203 alone, and connecting the first transmission line 202 and the second transmission line 203 at the same time, that is, the above three switching states can form different antenna structures. In this embodiment, the first switch unit K1 is set to switch the electrical connection between the first transmission line 202 and the second transmission line 203 to form antennas of different structures, so as to support the first frequency band in different scenarios and ensure the working stability of the first frequency band.

[0128] Optionally, in the initial state, the first switch unit K1 simultaneously turns on the first signal source 30 and the first sub-radiator 11 , and the first signal source 30 and the second sub-radiator 12 .

[0129] Optionally, the first switch unit K1 is used to switch to electrically connect the other end of the first transmission line 202 or to electrically connect the other end of the first transmission line 202 and the other end of the second transmission line 203 at the same time when the signal strength received and sent by the second sub-radiator 12 is less than or equal to a preset signal strength.

[0130] Specifically, the signal strength received and sent by the second sub-radiator 12 is less than or equal to the preset signal strength. There may be problems such as the second sub-radiator 12 being blocked by the hand, or the gap at the second free end H1 being blocked by the hand. Thus, in this embodiment, when the signal strength received and sent by the second sub-radiator 12 is less than or equal to the preset signal strength, the first switch unit K1 is triggered to switch to turning on the first sub-radiator 11 and the first signal source 30, or turning on the first sub-radiator 11 and the second sub-radiator 12 at the same time, so that the first sub-radiator 11 and the second sub-radiator 12 radiate at the same time. When the radiation efficiency of the second sub-radiator 12 is reduced, the first sub-radiator 11 participates in the radiation, thereby ensuring the radiation efficiency of the first frequency band and the stability of the electronic device 1000 operating in the first frequency band.

[0131] The first switch unit K1 is also used to switch to electrically connect to the other end of the second transmission line 203 or to electrically connect to the other end of the first transmission line 202 and the other end of the second transmission line 203 at the same time when the signal strength received and sent by the first sub-radiator 11 is less than or equal to the preset signal strength.

[0132] Specifically, the signal strength received and sent by the first sub-radiator 11 is less than or equal to the preset signal strength. There may be problems such as the first sub-radiator 11 being blocked by the hand, or the gap at the first free end A1 being blocked by the hand. In this way, this embodiment triggers the first switch unit K1 to switch to turning on the second sub-radiator 12 and the first signal source 30, or turning on the first sub-radiator 11 and the second sub-radiator 12 at the same time when the signal strength received and sent by the first sub-radiator 11 is less than or equal to the preset signal strength, so that the first sub-radiator 11 and the second sub-radiator 12 radiate at the same time. When the radiation efficiency of the first sub-radiator 11 is reduced, the second sub-radiator 12 participates in the radiation, thereby ensuring the radiation efficiency of the first frequency band and the stability of the electronic device 1000 operating in the first frequency band.

[0133] The first switch unit K1 is also used to switch to electrically connect the other end of the first transmission line 202 and the other end of the second transmission line 203 when the signal strength received and sent via the second sub-radiator 12 is less than or equal to the preset signal strength and / or the signal strength received and sent via the first sub-radiator 11 is less than or equal to the preset signal strength.

[0134] Specifically, the signal strength received and sent by the first sub-radiator 11 is less than or equal to the preset signal strength. There may be problems such as the first sub-radiator 11 being blocked by the hand, or the gap at the first free end A1 being blocked by the hand. In this way, this embodiment triggers the first switch unit K1 to switch to turning on the second sub-radiator 12 and the first signal source 30, or turning on the first sub-radiator 11 and the second sub-radiator 12 at the same time when the signal strength received and sent by the first sub-radiator 11 is less than or equal to the preset signal strength, so that the first sub-radiator 11 and the second sub-radiator 12 radiate at the same time. When the radiation efficiency of the first sub-radiator 11 is reduced, the second sub-radiator 12 participates in the radiation, thereby ensuring the radiation efficiency of the first frequency band and the stability of the electronic device 1000 operating in the first frequency band.

[0135] In an alternative embodiment, see Fig.15 , the number of the first sub-radiators 11 is two. The two first sub-radiators 11 are respectively disposed on the first side frame 323 and the second side frame 324. The number of the second sub-radiators 12 is two. The two second sub-radiators 12 are respectively disposed on the first side frame 323 and the second side frame 324. The first sub-radiator 11 and the second sub-radiator 12 disposed on the first side frame 323 form a first radiator group 13. The first sub-radiator 11 and the second sub-radiator 12 disposed on the second side frame 324 form a second radiator group 14.

[0136] See also Fig.15 , the antenna assembly 100 also includes a second switch unit K2. One end of the second switch unit K2 is electrically connected to the first signal source 30. The second switch unit K2 is also electrically connected to the first radiator group 13 and the second radiator group 14. The second switch unit K2 is used to switch to the first radiator group 13 to work or to the second radiator group 14 to work according to the signal strength. Among them, the operation of the first radiator group 13 refers to the joint operation of the first sub-radiator 11 and the second sub-radiator 12 provided on the first side frame 323. The operation of the second radiator group 14 refers to the joint operation of the first sub-radiator 11 and the second sub-radiator 12 provided on the second side frame 324.

[0137] Since the electronic device 1000 is actually held horizontally with both hands in scenarios where the USB of the electronic device 1000 is facing right or left, the embodiment of the present application sets a second switch unit K2 to switch the first radiator group 13 or the second radiator group 14 to operate according to the horizontal screen holding posture of the electronic device 1000 with the USB facing left or right or according to the signal strength detected during actual use, so as to ensure that the electronic device 1000 can ensure good signal strength regardless of the horizontal screen holding posture with the USB facing right or the horizontal screen holding posture with the USB facing left.

[0138] See also Fig.16 , the antenna assembly 100 further includes a first switch switching circuit T1. The first sub-radiator 11 further includes a first connection point B1 provided between the first feeding point C1 and the first free end A1. One end of the first switch switching circuit T1 is electrically connected to the first connection point B1 between the first feeding point C1 and the first free end A1, and the electrical connection method includes but is not limited to being electrically connected through a conductive structure such as a conductive spring. The first switch switching circuit T1 is provided on a circuit board (mainboard). Among them, the first connection point B1 is a current weak point on the first sub-radiator 11 that forms a 1 / 4 wavelength mode supporting the first frequency band, and this position is easier to tune the frequency band. The other end of the first switch switching circuit T1 is grounded (electrically connected to the reference floor 600), and the first switch switching circuit T1 is used to switch the sub-band of the first frequency band. When the first sub-radiator 11 works alone, the first switch switching circuit T1 is used to change the equivalent electrical length of the first sub-radiator 11 to switch the sub-band of the first frequency band. For example, if the first frequency band is the LB frequency band, the first switch circuit T1 can switch between low frequency bands (0.617-0.96 GHz) such as B5, B8, B28, and B71 to achieve full coverage of the low frequency bands.

[0139] See also Fig.16 , the antenna assembly 100 further includes a second switch switching circuit T2. The second sub-radiator 12 further includes a second connection point G1 provided between the second feeding point F1 and the second free end H1. One end of the second switch switching circuit T2 is electrically connected to the second connection point G1 between the second feeding point F1 and the second free end H1, and the electrical connection method includes but is not limited to being electrically connected through a conductive structure such as a conductive spring. The second switch switching circuit T2 is provided on a circuit board (mainboard). Among them, the second connection point G1 is a current weak point on the second sub-radiator 12 that forms a 1 / 4 wavelength mode supporting the first frequency band, and this position is easier to tune the frequency band. The other end of the second switch switching circuit T2 is grounded (electrically connected to the reference floor 600), and the second switch switching circuit T2 is used to switch the sub-band of the first frequency band. When the second sub-radiator 12 works alone, the second switch switching circuit T2 is used to change the equivalent electrical length of the second sub-radiator 12 to switch the sub-band of the first frequency band. For example, if the first frequency band is the LB frequency band, the second switch circuit T2 can switch between low frequency bands (0.617-0.96 GHz) such as B5, B8, B28, and B71 to achieve full coverage of the low frequency bands.

[0140] In one embodiment, the first switch switching circuit T1 may be provided alone, and the second switch switching circuit T2 may not be provided. In another embodiment, the first switch switching circuit T1 may not be provided, and the second switch switching circuit T2 may be provided alone.

[0141] When the first sub-radiator 11 and the second sub-radiator 12 work simultaneously, the first switch switching circuit T1 and the second switch switching circuit T2 switch synchronously, so that the electrical length of the first sub-radiator 11 is the same or similar to the electrical length of the second sub-radiator 12, so that a 1 / 4 wavelength mode supporting the first frequency band (for example, B8) is formed on the first sub-radiator 11, and at the same time, a 1 / 4 wavelength mode supporting the first frequency band (for example, B8) is formed on the second sub-radiator 12.

[0142] Optionally, the first sub-radiator 11 and the second sub-radiator 12 may have the same length and a symmetrical structure. The first matching circuit M1 and the second matching circuit M2 may have the same structure, and the first switch switching circuit T1 and the second switch switching circuit T2 may have the same circuit structure. The first switch switching circuit T1 is illustrated below.

[0143] Furthermore, the first switch circuit T1 is an impedance adjustable circuit, or an antenna switch circuit.

[0144] Optionally, the first switch switching circuit T1 includes an antenna switch and / or an adjustable capacitor.

[0145] In the first implementation of the first switch circuit T1, please refer to Fig.17 , the first switch switching circuit T1 further includes a first sub-switch T11 and a plurality of first switching branches T12. One end of each of the plurality of first switching branches T12 is electrically connected to one end of the first sub-switch T11, and the other end of the first sub-switch T11 is electrically connected to the first connection point B1. That is, the first sub-switch T11 includes but is not limited to a transistor, a field effect transistor, etc. The other end of each of the plurality of first switching branches T12 is grounded.

[0146] The impedance value of each first switching branch T12 is different. For example, the plurality of first switching branches T12 are a plurality of capacitors with different capacitance values. Alternatively, the plurality of first switching branches T12 are a plurality of inductors with different inductance values. Alternatively, the plurality of first switching branches T12 include a plurality of capacitors with different capacitance values, and a plurality of inductors with different inductance values. By adjusting the first sub-switch T11 to be electrically connected to different devices, the equivalent electrical length of the first switching branch T12 electrically connected to the first sub-radiator 11 is adjusted, thereby switching the sub-band in the supported first frequency band.

[0147] In a second embodiment of the first switch switching circuit T1, the first switch switching circuit T1 includes an adjustable capacitor. One end of the adjustable capacitor is electrically connected to the first connection point B1, and the other end is grounded. The size of the adjustable capacitor is adjustable and is used to switch the sub-band in the supported first frequency band. The adjustable capacitor is a capacitor with an adjustable capacitance value. In this way, by adjusting the capacitance value of the capacitor, the impedance value of the first switch switching circuit T1 is adjustable, thereby adjusting the effective electrical length of the first switch switching circuit T1, further adjusting the effective electrical length of the first sub-radiator 11, and then switching the sub-band in the supported first frequency band.

[0148] Of course, the first switch switching circuit T1 may also be a combination of the first implementation and the second implementation described above. For example, the first switching branch T12 includes the adjustable capacitor.

[0149] See also Fig.18a and Fig.18b Each of the side frames includes a first vertical screen free zone Z3 and a vertical screen holding zone Z4. The vertical screen holding zone Z4 is the area on the side frame that is held by the hand when the screen is held in a vertical position. The first vertical screen free zone Z3 is the area on the side frame that is not held by the hand when the screen is held in a vertical position.

[0150] See also Fig.18a and Fig.18b , Fig.18a It is a schematic diagram of the structure of the electronic device 1000 when being held vertically in the left hand. Fig.18b It is a structural diagram of the electronic device 1000 when the screen is held vertically in the right hand. The vertical screen holding area Z4 is the area on the side frame (the first side frame 323 or the second side frame 324) that is held by the hand when the screen is held vertically. The first vertical screen free area Z3 is the area on the side frame (the first side frame 323 or the second side frame 324) that is not held by the hand when the screen is held vertically. The present application does not make specific restrictions on the size of the vertical screen holding area Z4. Optionally, the length of the vertical screen holding area Z4 along the side frame is less than or equal to 100 mm. Furthermore, the vertical screen holding area Z4 is an area that is less than or equal to 100 mm from the bottom frame 322. The first vertical screen free area Z3 is the area on the side frame except the vertical screen holding area Z4.

[0151] See also Fig.19 The antenna assembly 100 further includes a second radiator 40 and a second signal source 60. The second radiator 40 and the first radiator 10 are respectively disposed on different side frames. For example, the first radiator 10 is disposed on the second side frame 324. The second radiator 40 is disposed on the first side frame 323.

[0152] See also Fig.19, the second radiator 40 includes a third sub-radiator 41 and a fourth sub-radiator 42 that are connected or adjacent. Optionally, the third sub-radiator 41 and the third sub-radiator 41 are adjacent second radiators 40. For example, the grounding point of the third sub-radiator 41 and the grounding point of the fourth sub-radiator 42 are independent of each other and are arranged adjacent to each other. Optionally, the third sub-radiator 41 and the fourth sub-radiator 42 are connected second radiators 40, for example, the grounding point of the third sub-radiator 41 and the grounding point of the fourth sub-radiator 42 are the same point.

[0153] The end of the third sub-radiator 41 away from the fourth sub-radiator 42 is the third free end A2. The third free end A2 is arranged in the first vertical screen free zone Z3 to avoid the third free end A2 being held by the hand when the screen is held vertically, causing problems such as a sharp decrease in efficiency and frequency deviation. The end of the fourth sub-radiator 42 away from the third sub-radiator 41 is the fourth free end H2. The fourth free end H2 is arranged in the second vertical screen free zone Z5 on the bottom frame 322 (the distance between the first vertical screen free zone Z3 on the bottom frame 322 and the side frame is greater than or equal to 10mm) to avoid the fourth free end H2 being held by the hand when the screen is held vertically, causing problems such as a sharp decrease in efficiency and frequency deviation. The above can improve the radiation efficiency of the second radiator 40.

[0154] The second signal source 60 is electrically connected to the second radiator 40 to stimulate the second radiator 40 to form a third resonance mode supporting the second frequency band. The second frequency band and the first frequency band may be the same frequency band or different frequency bands. In this embodiment, the second frequency band is taken as the LB frequency band as an example.

[0155] In this embodiment, the third sub-radiator 41 and the fourth sub-radiator 42 are taken as an example as part of the metal frame 320 of the electronic device 1000 .

[0156] See also Fig.19 , the third sub-radiator 41 includes a third grounding point D2, a third feeding point C2 and a third free end A2 which are arranged in sequence. The third grounding point D2 is electrically connected to the reference ground 600. The third free end A2 is an end which is disconnected from other conductive structures. Of course, an insulating material may be filled between the third free end A2 and other conductive structures to ensure the firmness of the connection between the third sub-radiator 41 and other conductive structures.

[0157] See also Fig.19, the fourth sub-radiator 42 includes a fourth grounding point E2, a fourth feeding point F2 and a fourth free end H2 which are arranged in sequence. The fourth grounding point E2 is electrically connected to the reference ground 600. The fourth free end H2 is an end which is disconnected from other conductive structures. Of course, an insulating material may be filled between the fourth free end H2 and other conductive structures to ensure the firmness of the connection between the fourth sub-radiator 42 and other conductive structures.

[0158] See also Fig.19 , the fourth grounding point E2 is located on the side of the third feeding point C2 away from the third free end A2. Optionally, the third free end A2, the third feeding point C2, the third grounding point D2, the fourth grounding point E2, the fourth feeding point F2 and the fourth free end H2 are arranged in sequence. Among them, the area between the third grounding point D2 and the fourth grounding point E2 is a part of the metal frame 320, and the third sub-radiator 41 and the fourth sub-radiator 42 are located on the same section of the metal frame 320. Furthermore, the third grounding point D2 and the fourth grounding point E2 can be the same point, so the length of the metal frame 320 occupied by the third sub-radiator 41 and the fourth sub-radiator 42 can be reduced.

[0159] See also Fig.19 The second feeding network 50 is electrically connected to the third feeding point C2 and the fourth feeding point F2. The electrical connection method includes but is not limited to the electrical connection method of the conductive spring.

[0160] The second signal source 60 is used to provide an excitation signal of a third phase to the third sub-radiator 41 via the second feeding network 50 and the third feeding point C2. The second signal source 60 is also used to provide an excitation signal of a fourth phase to the fourth sub-radiator 42 via the second feeding network 50 and the fourth feeding point F2. The excitation signal is a radio frequency current signal. The excitation signal of the third phase is transmitted to the third sub-radiator 41 via the third feeding point C2, and a resonance of a corresponding frequency is formed on the third sub-radiator 41, and the resonance can realize the reception and transmission of electromagnetic waves within a certain frequency band. The excitation signal of the fourth phase is transmitted to the fourth sub-radiator 42 via the fourth feeding point F2, and a resonance of a corresponding frequency is formed on the fourth sub-radiator 42, and the resonance can realize the reception and transmission of electromagnetic waves within a certain frequency band.

[0161] The third phase and the fourth phase may be the same or different.

[0162] The second feeding network 50 provides an excitation signal of a third phase to the third sub-radiator 41 and an excitation signal of a fourth phase to the fourth sub-radiator 42, so as to excite the third sub-radiator 41 and the fourth sub-radiator 42 to jointly form a third resonance mode supporting the second frequency band. The main current formed on the reference floor 600 by the third resonance mode is a longitudinal current distributed along the length direction of the reference floor 600, while the transverse current in the width direction is very small, which effectively excites the current in the direction of the longer dimension on the reference floor 600, thereby obtaining a higher antenna radiation efficiency and improving the working bandwidth.

[0163] See also Fig.19 , the present application does not limit the positions of the third sub-radiator 41 and the fourth sub-radiator 42 on the frame 320. Optionally, at least a portion of the third sub-radiator 41 and at least a portion of the fourth sub-radiator 42 are disposed on the first reference ground edge 610. Specifically, the entire third sub-radiator 41 is disposed on an edge along the length direction of the reference floor 600, for example, the first reference ground edge 610. The entire or a portion of the fourth sub-radiator 42 is disposed on an edge along the length direction of the reference floor 600, for example, the first reference ground edge 610. When the second radiator 40 is disposed along the edge in the length direction of the reference floor 600, more current can be stimulated on the edge in the length direction of the reference floor 600, that is, more longitudinal current can be stimulated. The longitudinal current on the reference floor 600 can increase the far-field radiation energy of the second radiator 40, thereby increasing the radiation efficiency of the second radiator 40.

[0164] Of course, in other embodiments, all or part of the third sub-radiator 41 is disposed along the length direction of the reference floor 600, such as the first reference ground edge 610. The entirety of the fourth sub-radiator 42 is disposed along the length direction of the reference floor 600, such as the first reference ground edge 610.

[0165] By setting the third phase of the excitation signal fed into the third sub-radiator 41, and the fourth phase of the excitation signal fed into the fourth sub-radiator 42, it is achieved that most of the current after the third floor current and the fourth floor current are superimposed and offset is a longitudinal current distributed along the length direction of the reference floor 600, and a very small part or basically no current is a transverse current along the width direction of the reference floor 600. In this way, the main current formed on the reference floor 600 by the third resonance mode is a longitudinal current distributed along the length direction of the reference floor 600.

[0166] The difference between the third phase and the fourth phase is a second preset phase difference. Optionally, the second preset phase difference is 0°±20°, so that the third resonance mode forms the longitudinal current (in the length direction of the reference floor 600 ) on the reference floor 600 .

[0167] See also Fig. 20 and Fig.21 , Fig. 20 and Fig.21 The longer the arrow is, the greater the current intensity is; Fig. 20 and Fig.21 The more arrows there are in a certain direction or the greater the distribution density is, the greater the current intensity is in that direction.

[0168] See also Fig. 20 When the third phase is close to 0°, the direction of the main current in the third floor current formed by the third sub-radiator 41 on the reference floor 600 is vertically downward, and the direction of a small amount of current is horizontally leftward.

[0169] See also Fig.21 When the fourth phase is close to 0°, the direction of the main current in the fourth floor current formed by the fourth sub-radiator 42 on the reference floor 600 is vertically downward, and the direction of a small amount of current is horizontally to the right.

[0170] The difference between the third phase and the fourth phase is close to 0°. 0° is an example, and the second preset phase difference between the third phase and the fourth phase can also be -20 to 20°. The intensity of the longitudinal current of the third floor current is greater than the intensity of the transverse current, and the intensity of the longitudinal current of the fourth floor current is greater than the intensity of the transverse current. The directions of the longitudinal currents in the third floor current and the fourth floor current are the same, and the directions of the transverse currents are opposite.

[0171] The directions of the main currents in the third floor current and the fourth floor current are the same, both are vertically downward, so the vertically downward third floor current and the vertically downward fourth floor current can be constructively superimposed to form a current with a vertically downward direction and stronger intensity. Since the direction of the small amount of transverse current in the third floor current is opposite to the direction of the small amount of transverse current in the fourth floor current, the transverse current in the third floor current that is horizontal to the left and the transverse current in the fourth floor current that is horizontal to the right are subtracted and canceled, so that the transverse currents are basically canceled. After the third floor current and the fourth floor current are integrated, the main current is a vertically downward longitudinal current, such as Fig. 22 .

[0172] This embodiment simulates the floor current under different third phases and fourth phases, and adjusts the difference between the third phase and the fourth phase, so that the transverse current on the reference floor 600 is offset as much as possible. In this way, more longitudinal currents are stimulated on the reference floor 600, so that the reference floor 600 participates more in the antenna radiation, which is beneficial to improving the antenna radiation efficiency.

[0173] This application illustrates the specific structure of the second feeding network 50 with reference to the accompanying drawings.

[0174] In an alternative embodiment, see Fig.23 , the second feeding network 50 includes a fourth transmission line 502, a fifth transmission line 503 and a sixth transmission line 504. One end of the fourth transmission line 502 is electrically connected to the third feeding point C2. One end of the fifth transmission line 503 is electrically connected to the fourth feeding point F2. The other end of the fourth transmission line 502 is electrically connected to the other end of the fifth transmission line 503 and one end of the sixth transmission line 504. The other end of the sixth transmission line 504 is electrically connected to the second signal source 60.

[0175] In this embodiment, the second signal source 60 is designed to be electrically connected to the third sub-radiator 41 and the fourth sub-radiator 42 through the fourth transmission line 502, the fifth transmission line 503 and the sixth transmission line 504, so that the third sub-radiator 41 and the fourth sub-radiator 42 receive the same feed signal. In other words, the excitation signal of the third phase and the excitation signal of the fourth phase come from the same second signal source 60, and the intensity of the excitation signal of the third phase is the same as or similar to the intensity of the excitation signal of the fourth phase.

[0176] Of course, in other embodiments, the fourth transmission line 502 and the fifth transmission line 503 can be electrically connected to different second signal sources 60 to satisfy that the excitation signal fed into the third feeding point C2 and the excitation signal fed into the fourth feeding point F2 are respectively in the third phase and the fourth phase and have equal strength.

[0177] Optionally, the difference between the length of the fourth transmission line 502 and the length of the fifth transmission line 503 is a second preset length, so that the phase difference between the third phase and the fourth phase is the second preset phase difference. In other words, in this embodiment, the excitation signal with the same phase transmitted by the sixth transmission line 504 is divided into an excitation signal of the third phase and an excitation signal of the fourth phase through the length difference between the fourth transmission line 502 and the fifth transmission line 503.

[0178] The present application does not specifically limit the second preset length, and optionally, the second preset length is determined by the second preset phase difference. The second preset length is the wavelength of the second frequency band×(preset phase difference / 360°).

[0179] Optional, see Fig.23 When the phase difference between the third phase and the fourth phase is 0°, the lengths of the fourth transmission line 502 and the fifth transmission line 503 are the same.

[0180] The present application simulates the values ​​of the third phase and the fourth phase at the third feeding point C2 port position of the third sub-radiator 41 and the fourth feeding point F2 port position of the fourth sub-radiator 42, and determines the appropriate third phase value and fourth phase value, determines the second preset phase difference according to the third phase value and the fourth phase value, determines the second preset length according to the second preset phase difference, and designs the size of the fourth transmission line 502 and the fifth transmission line 503 according to the second preset length. The size of the fourth transmission line 502 and the sixth transmission line 504 is determined according to the difference between the initial phase of the second signal source 60 and the third phase, so that the excitation signal of the initial phase emitted by the second signal source 60 is transmitted to the third feeding point C2 via the sixth transmission line 504 and the fourth transmission line 502, and the excitation signal of the initial phase emitted by the second signal source 60 is transmitted to the fourth feeding point F2 via the sixth transmission line 504 and the fifth transmission line 503, and is the excitation signal of the fourth phase.

[0181] In this embodiment, the length difference between the fourth transmission line 502 and the fifth transmission line 503 is designed to meet the preset phase difference design between the third phase and the fourth phase, and the design method is simple and effective. By designing the preset phase difference between the third phase and the fourth phase, the longitudinal currents in the third floor current and the fourth floor current are in the same direction, and the transverse currents are in opposite directions, so that the transverse currents on the reference floor 600 are offset as much as possible, so that more longitudinal currents are stimulated on the reference floor 600, so that the reference floor 600 participates more in the antenna radiation, which is conducive to improving the antenna radiation efficiency.

[0182] Optional, see Fig.23 , the antenna assembly 100 also includes a third matching circuit M3 and a fourth matching circuit M4. The third matching circuit M3 is electrically connected between an end of the fourth transmission line 502 away from the fifth transmission line 503 and the third feeding point C2. The third matching circuit M3 includes adjusting the impedance matching between the port of the second signal source 60 and the port of the third sub-radiator 41, so that the excitation signal emitted by the second signal source 60 excites a resonant current of a 1 / 4 wavelength mode of the second frequency band on the third sub-radiator 41. Specifically, the third matching circuit M3 includes but is not limited to at least one of a series inductor, a parallel inductor, a parallel capacitor, etc.

[0183] The fourth matching circuit M4 is electrically connected between one end of the fifth transmission line 503 away from the fourth transmission line 502 and the fourth feeding point F2. The fourth matching circuit M4 includes adjusting the impedance matching between the port of the second signal source 60 and the port of the fourth sub-radiator 42, so as to facilitate the excitation signal emitted by the second signal source 60 to excite a resonant current of a 1 / 4 wavelength mode of the second frequency band on the fourth sub-radiator 42. Specifically, the fourth matching circuit M4 includes but is not limited to at least one of a series inductor, a parallel inductor, a parallel capacitor, and the like.

[0184] Optional, see Fig.24 , the second feeding network 50 includes a first inductance element L1 and a second inductance element L2. The first inductance element L1 is electrically connected between one end of the fourth transmission line 502 and the third feeding point C2. Optionally, the first inductance element L1 is a device connected to the third feeding point C2 in the third matching circuit M3. The second inductance element L2 is electrically connected between one end of the fifth transmission line 503 and the fourth feeding point F2. Optionally, the second inductance element L2 is a device connected to the fourth feeding point F2 in the fourth matching circuit M4.

[0185] The first inductor element L1 is a small inductor, and the inductance value of the small inductor is less than 3.6 nH. For example, the inductance value of the first inductor element L1 is 2 nH.

[0186] The second inductor element L2 is a small inductor, and the inductance value of the small inductor is less than 3.6 nH. For example, the inductance value of the second inductor element L2 is 2 nH.

[0187] Of course, in other implementations, the second feeding network 50 may not include the first inductor element L1 and the second inductor element L2 .

[0188] In this embodiment, by designing the first inductance element L1 to be electrically connected between the fourth transmission line 502 and the third feeding point C2, and the second inductance element L2 to be electrically connected between the fifth transmission line 503 and the fourth feeding point F2, the second signal source 60 is fed through a small inductance, no capacitor is set between the fourth transmission line 502 and the third feeding point C2, and no capacitor is set between the fifth transmission line 503 and the fourth feeding point F2. In this way, when the fourth transmission line 502, the fifth transmission line 503 and the sixth transmission line 504 are set, no capacitor is set on the feeding path, but feeding is performed through a small inductance to reduce the loss on the feeding path and improve the transmission efficiency.

[0189] In this embodiment, while ensuring that the third sub-radiator 41 supports the 1 / 4 wavelength mode of the second frequency band and the fourth sub-radiator 42 supports the 1 / 4 wavelength mode of the second frequency band, the distance between the third feeding point C2 and the fourth feeding point F2 is reduced as much as possible to reduce the length of the fourth transmission line 502 and the fifth transmission line 503.

[0190] Optionally, the fourth transmission line 502 is a microstrip line or a stripline; and / or, the fifth transmission line 503 is a microstrip line or a stripline; and / or, the sixth transmission line 504 is a microstrip line or a stripline. Optionally, the fourth transmission line 502, the fifth transmission line 503 and the sixth transmission line 504 are all microstrip lines; or, the fourth transmission line 502, the fifth transmission line 503 and the sixth transmission line 504 are all striplines, so that the fourth transmission line 502, the fifth transmission line 503 and the sixth transmission line 504 are prepared in the same process.

[0191] In this embodiment, the fourth transmission line 502, the fifth transmission line 503, and the sixth transmission line 504 are designed to be microstrip lines or strip lines, so that the fourth transmission line 502, the fifth transmission line 503, and the sixth transmission line 504 are arranged on the circuit board, thereby reducing the difficulty of preparing the fourth transmission line 502, the fifth transmission line 503, and the sixth transmission line 504 and improving the production efficiency.

[0192] Furthermore, the second signal source 60 is disposed on the circuit board, and the second signal source 60 includes but is not limited to a radio frequency transceiver chip.

[0193] The third matching circuit M3 and the fourth matching circuit M4 are arranged on the circuit board. The first inductance element L1 is electrically connected to the third feeding point C2 via a conductive spring. The second inductance element L2 is electrically connected to the fourth feeding point F2 via a conductive spring.

[0194] In an alternative embodiment, see Fig.19 , the third grounding point D2 and the fourth grounding point E2 are the same point, so that the third sub-radiator 41 is connected to the fourth sub-radiator 42. The combined length of the third sub-radiator 41 and the fourth sub-radiator 42 is the smallest, reducing the space occupied on the conductive frame 320. By setting the third grounding point D2 and the fourth grounding point E2 to be the same point, the distance between the third feeding point C2 and the fourth feeding point F2 can be reduced, thereby reducing the length of the fourth transmission line 502 and the fifth transmission line 503, and reducing the space occupied by the second feeding network 50 on the circuit board.

[0195] In an optional embodiment, the third grounding point D2 is directly short-circuited to the ground, wherein the third grounding point D2 can be directly electrically connected to the reference floor 600 through a grounding spring clip, or the position of the conductive frame 320 where the third grounding point D2 is located can be physically connected to the first reference edge of the reference floor 600, that is, the position of the conductive frame 320 where the third grounding point D2 is located is not disconnected from the position of the first reference ground edge 610, so as to achieve direct electrical connection to the reference floor 600.

[0196] For optional reference, see Fig.19, the antenna assembly 100 also includes a third inductor element L3. The third inductor element L3 is arranged on the circuit board, and the third grounding point D2 electrically connects the third inductor element L3 to the ground (electrically connected to the reference floor 600). Among them, the inductance value of the third inductor element L3 is less than the preset inductance value. The third inductor element L3 can be a small inductor. The present application does not make specific limitations on the preset inductance value. The preset inductance value is 3.6nH.

[0197] Correspondingly, the fourth grounding point E2 is directly short-circuited to the ground, wherein the fourth grounding point E2 can be directly electrically connected to the reference floor 600 through a grounding spring clip, or the position of the conductive frame 320 where the fourth grounding point E2 is located can be physically connected to the first reference edge of the reference floor 600, that is, the position of the conductive frame 320 where the fourth grounding point E2 is located is not disconnected from the position of the first reference ground edge 610, so as to achieve direct electrical connection to the reference floor 600.

[0198] When the third ground point D2 and the fourth ground point E2 are different points, the fourth ground point E2 can be electrically connected to the reference ground 600 through a fourth inductor element. The fourth inductor element can be a small inductor.

[0199] In an embodiment where the third grounding point D2 and the fourth grounding point E2 are spaced apart and both are physically grounded, a portion of the first side frame 323 of the conductive frame 320 is not disconnected from the metal portion of the middle plate serving as the reference floor 600, and the middle connecting portion is defined as a connecting portion, which has a certain size in the extension direction of the first side frame 323, and an end of the connecting portion close to the top frame 321 is electrically connected to the third feeding point C2, and an end of the connecting portion close to the bottom frame 322 is electrically connected to the fourth feeding point F2.

[0200] The above is an implementation method in which the third sub-radiator 41 and the fourth sub-radiator 42 work simultaneously to support the second frequency band. The present application is designed to achieve that the third sub-radiator 41 and the fourth sub-radiator 42 can work simultaneously or individually to support the second frequency band.

[0201] In one embodiment, see Fig.25The antenna assembly 100 further includes a third switch unit K3. One end of the third switch unit K3 is electrically connected to one end of the sixth transmission line 504, and the other end of the third switch unit K3 can be selectively electrically connected to the other end of the fourth transmission line 502, so that the third sub-radiator 41 works in a single-feed mode; or, the other end of the third switch unit K3 can be selectively electrically connected to the other end of the fifth transmission line 503, so that the fourth sub-radiator 42 works in a single-feed mode; or, the other end of the third switch unit K3 can be selectively electrically connected to the other end of the fourth transmission line 502 and the other end of the fifth transmission line 503, so that the third sub-radiator 41 and the fourth sub-radiator 42 work together in a dual-feed mode.

[0202] The third switch unit K3 includes but is not limited to a switch tube, a transistor, a MOS tube, etc. The moving end of the third switch unit K3 can realize that the antenna assembly 100 can have three structural forms by selecting to electrically connect the fourth transmission line 502 alone, selecting to electrically connect the fifth transmission line 503 alone, and connecting the fourth transmission line 502 and the fifth transmission line 503 at the same time, that is, the above three switching states can form different antenna structures. In this embodiment, the third switch unit K3 is set to switch the electrical connection between the fourth transmission line 502 and the fifth transmission line 503 to form antennas with different structures, so as to support the second frequency band in different scenarios and ensure the working stability of the second frequency band.

[0203] Optionally, in the initial state, the third switch unit K3 turns on the second signal source 60 and the third sub-radiator 41 , and the second signal source 60 and the fourth sub-radiator 42 at the same time.

[0204] Optionally, the third switch unit K3 is used to switch to electrically connecting the other end of the fourth transmission line 502 or simultaneously electrically connecting the other end of the fourth transmission line 502 and the other end of the fifth transmission line 503 when the signal strength received and sent by the fourth sub-radiator 42 is less than or equal to a preset signal strength.

[0205] Specifically, the signal strength received and sent by the fourth sub-radiator 42 is less than or equal to the preset signal strength. There may be problems such as the fourth sub-radiator 42 being blocked by the hand, or the break at the fourth free end H2 being blocked by the hand. Thus, in this embodiment, when the signal strength received and sent by the fourth sub-radiator 42 is less than or equal to the preset signal strength, the third switch unit K3 is triggered to switch to turning on the third sub-radiator 41 and the second signal source 60, or turning on the third sub-radiator 41 and the fourth sub-radiator 42 at the same time, so that the third sub-radiator 41 and the fourth sub-radiator 42 radiate at the same time. When the radiation efficiency of the fourth sub-radiator 42 is reduced, the third sub-radiator 41 participates in the radiation, thereby ensuring the radiation efficiency of the second frequency band and the stability of the electronic device 1000 operating in the second frequency band.

[0206] The third switch unit K3 is also used to switch to electrically connect the other end of the fifth transmission line 503 or to electrically connect the other end of the fourth transmission line 502 and the other end of the fifth transmission line 503 at the same time when the signal strength received and sent by the third sub-radiator 41 is less than or equal to the preset signal strength.

[0207] Specifically, the signal strength received and sent by the third sub-radiator 41 is less than or equal to the preset signal strength. There may be problems such as the third sub-radiator 41 being blocked by the hand, or the gap at the third free end A2 being blocked by the hand. In this way, when the signal strength received and sent by the third sub-radiator 41 is less than or equal to the preset signal strength, this embodiment triggers the third switch unit K3 to switch to turning on the fourth sub-radiator 42 and the second signal source 60, or turning on the third sub-radiator 41 and the fourth sub-radiator 42 at the same time, so that the third sub-radiator 41 and the fourth sub-radiator 42 radiate at the same time. When the radiation efficiency of the third sub-radiator 41 is reduced, the fourth sub-radiator 42 participates in the radiation, which can ensure the radiation efficiency of the second frequency band and the stability of the electronic device 1000 operating in the second frequency band.

[0208] The third switch unit K3 is also used to switch to electrically connect the other end of the fourth transmission line 502 and the other end of the fifth transmission line 503 when the signal strength received and sent via the fourth sub-radiator 42 is less than or equal to the preset signal strength and / or the signal strength received and sent via the third sub-radiator 41 is less than or equal to the preset signal strength.

[0209] Specifically, the signal strength received and sent by the third sub-radiator 41 is less than or equal to the preset signal strength. There may be problems such as the third sub-radiator 41 being blocked by the hand, or the gap at the third free end A2 being blocked by the hand. In this way, when the signal strength received and sent by the third sub-radiator 41 is less than or equal to the preset signal strength, this embodiment triggers the third switch unit K3 to switch to turning on the fourth sub-radiator 42 and the second signal source 60, or turning on the third sub-radiator 41 and the fourth sub-radiator 42 at the same time, so that the third sub-radiator 41 and the fourth sub-radiator 42 radiate at the same time. When the radiation efficiency of the third sub-radiator 41 is reduced, the fourth sub-radiator 42 participates in the radiation, which can ensure the radiation efficiency of the second frequency band and the stability of the electronic device 1000 operating in the second frequency band.

[0210] The electrical length between the third ground point D2 and the third free end A2 is close to 1 / 4 wavelength. When the third switch unit K3 conducts the fourth transmission line 502 and the sixth transmission line 504, the second signal source 60 excites the third ground point D2 to form a 1 / 4 wavelength mode supporting the second frequency band (please refer to Figure 5In this way, the second signal source 60 excites the third sub-radiator 41 to support the second frequency band.

[0211] The electrical length between the fourth grounding point E2 and the fourth free end H2 is close to 1 / 4 wavelength. When the third switch unit K3 conducts the fifth transmission line 503 and the sixth transmission line 504, the second signal source 60 excites the fourth grounding point E2 to form a 1 / 4 wavelength mode of the second frequency band between the fourth free end H2 (see Figure 6 In this way, the second signal source 60 excites the fourth sub-radiator 42 to support the second frequency band.

[0212] As the clearance of mobile phones becomes smaller and smaller, the antenna installation environment becomes worse and worse, and the performance of antennas is also affected. It is very likely that they will not meet the operator's OTA indicators and the needs of some markets. In addition, mobile phones are often used in handheld scenarios, and human hands will have a certain impact on the performance of mobile phone antennas. In special cases, the antenna will be in a grip state, and the antenna performance is basically 0 at this time.

[0213] In one embodiment, see Fig.19 , the third sub-radiator 41 is disposed on the first side frame 323. A portion of the fourth sub-radiator 42 is disposed on the first side frame 323, and another portion of the fourth sub-radiator 42 is disposed on the bottom frame 322. By setting the difference between the third phase and the fourth phase to 0°, the intensity of the longitudinal current of the third floor current is greater than the intensity of the transverse current, the intensity of the longitudinal current of the fourth floor current is greater than the intensity of the transverse current, and the directions of the longitudinal currents in the third floor current and the fourth floor current are the same, and the directions of the transverse currents are opposite.

[0214] In this embodiment, the first slit of the third free end A2 is located at the middle and lower position of the first side frame 323, and the second slit of the fourth free end H2 is located at the bottom frame 322. In the holding scenario, the first slit of the third free end A2 and the second slit of the fourth free end H2 are easily held by the hand. Since the slits at the free ends are parallel electric fields, the parallel electric fields are easily absorbed by the human body, which leads to a sharp drop in efficiency. Therefore, how to prevent the fingers from covering the slits at the free ends in the holding scenario becomes a technical problem that needs to be solved.

[0215] Furthermore, the distance between the third free end A2 and the bottom frame 322 is greater than 89 mm, so that the first gap of the third free end A2 is located above the left thumb in the left-hand holding scenario, and the first gap of the third free end A2 is located above the right middle finger in the right-hand holding scenario, thereby preventing the gap on the third free end A2 from being blocked by fingers in the left-hand holding and right-hand holding scenarios, and preventing the parallel electric field at the gap of the free end from being absorbed by the human body and causing a sharp drop in efficiency, thereby improving the performance of the antenna assembly 100 in the handheld scenario.

[0216] The distance between the fourth free end H2 and the first side frame 323 is greater than 18 mm, so that the second gap of the fourth free end H2 is located outside the left palm in the left-hand holding scenario, and the second gap of the fourth free end H2 is located outside the right palm in the left-hand holding scenario, thereby preventing the gap on the third free end A2 from being blocked by fingers in the left-hand holding and right-hand holding scenarios, and preventing the parallel electric field at the gap of the free end from being absorbed by the human body and causing a sharp drop in efficiency, thereby improving the performance of the antenna assembly 100 in the handheld scenario.

[0217] See also Fig.26 , the antenna assembly 100 further includes a third switch switching circuit T3. The third sub-radiator 41 further includes a third connection point B2 provided between the third feeding point C2 and the third free end A2. One end of the third switch switching circuit T3 is electrically connected to the third connection point B2 between the third feeding point C2 and the third free end A2, and the electrical connection method includes but is not limited to being electrically connected through a conductive structure such as a conductive spring. The third switch switching circuit T3 is provided on a circuit board (mainboard). Among them, the third connection point B2 is a current weak point on the third sub-radiator 41 that forms a 1 / 4 wavelength mode supporting the second frequency band, and this position is easier to tune the frequency band. The other end of the third switch switching circuit T3 is grounded (electrically connected to the reference floor 600), and the third switch switching circuit T3 is used to switch the sub-band of the second frequency band. When the third sub-radiator 41 works alone, the third switch switching circuit T3 is used to change the equivalent electrical length of the third sub-radiator 41 to switch the sub-band of the second frequency band. For example, if the second frequency band is the LB frequency band, the third switch circuit T3 can switch between low frequency bands (0.617-0.96 GHz) such as B5, B8, B28, and B71 to achieve full coverage of the low frequency bands.

[0218] See also Fig.26, the antenna assembly 100 further includes a fourth switch switching circuit T4. The fourth sub-radiator 42 further includes a fourth connection point G2 disposed between the fourth feeding point F2 and the fourth free end H2. One end of the fourth switch switching circuit T4 is electrically connected to the fourth connection point G2 between the fourth feeding point F2 and the fourth free end H2, and the electrical connection method includes but is not limited to being electrically connected through a conductive structure such as a conductive spring. The fourth switch switching circuit T4 is disposed on a circuit board (mainboard). Among them, the fourth connection point G2 is a current weak point on the fourth sub-radiator 42 that forms a 1 / 4 wavelength mode supporting the second frequency band, and this position is easier to tune the frequency band. The other end of the fourth switch switching circuit T4 is grounded (electrically connected to the reference floor 600), and the fourth switch switching circuit T4 is used to switch the sub-band of the second frequency band. When the fourth sub-radiator 42 works alone, the fourth switch switching circuit T4 is used to change the equivalent electrical length of the fourth sub-radiator 42 to switch the sub-band of the second frequency band. For example, if the second frequency band is the LB frequency band, the fourth switch circuit T4 can switch between low frequency bands (0.617-0.96 GHz) such as B5, B8, B28, and B71 to achieve full coverage of the low frequency bands.

[0219] In one embodiment, the third switch switching circuit T3 may be provided alone, and the fourth switch switching circuit T4 may not be provided. In another embodiment, the third switch switching circuit T3 may not be provided, and the fourth switch switching circuit T4 may be provided alone.

[0220] When the third sub-radiator 41 and the fourth sub-radiator 42 work simultaneously, the third switch switching circuit T3 and the fourth switch switching circuit T4 switch synchronously, so that the electrical length of the third sub-radiator 41 is the same or similar to the electrical length of the fourth sub-radiator 42, so that a 1 / 4 wavelength mode supporting the second frequency band (for example, B8) is formed on the third sub-radiator 41, and at the same time, a 1 / 4 wavelength mode supporting the second frequency band (for example, B8) is formed on the fourth sub-radiator 42.

[0221] Optionally, the third sub-radiator 41 and the fourth sub-radiator 42 may have the same length and a symmetrical structure. The third matching circuit M3 and the fourth matching circuit M4 may have the same structure, and the third switch switching circuit T3 and the fourth switch switching circuit T4 may have the same circuit structure. The third switch switching circuit T3 is illustrated below.

[0222] Furthermore, the third switch circuit T3 is an impedance adjustable circuit, or an antenna switch circuit. The specific structure of the third switch circuit T3 can refer to the specific structure of the first switch circuit T1.

[0223] Optionally, the third switch switching circuit T3 includes an antenna switch and / or an adjustable capacitor.

[0224] See also Fig. 27 , the electric field near the conductive frame 320 is perpendicular to the conductive frame 320, and the electric field at the gap of the free end is parallel to the conductive frame 320. When a human hand touches the conductive frame 320, the perpendicular electric field can stimulate the hand to act as an effective second radiator 40, while the parallel electric field will enter the human body and be lost inside the human body.

[0225] See also Fig.28 , in the left hand holding scenario, the thumb is in contact with the third sub-radiator 41 ( Fig.28 The vertical electric field near the third sub-radiator 41 will stimulate the thumb. According to the size of the contact area between the thumb and the third sub-radiator 41, the thumb contact will improve the radiation performance of the vertical electric field of the third sub-radiator 41 in the B5 / B8 frequency band. Fig.28 At the contact position 2), the vertical electric field of the fourth sub-radiator 42 will stimulate the palm part. According to the size of the contact area between the palm and the fourth sub-radiator 42, the palm contact will improve the radiation performance of the vertical electric field of the third sub-radiator 41 in the B28 / B71 frequency band.

[0226] Based on this, in an optional embodiment, the third switch switching circuit T3 is used to switch the sub-band of the second frequency band according to the size of the contact area between the hand and the third sub-radiator 41; and / or the fourth switch switching circuit T4 switches the sub-band of the second frequency band according to the size of the contact area between the hand and the fourth sub-radiator 42.

[0227] Specifically, when communication is possible in the LB frequency band, the third switch switching circuit T3 intelligently tunes the sub-frequency band supported by the third resonant mode according to the size of the contact area between the hand and the third sub-radiator 41, so that the contact of the hand can improve the radiation performance of the vertical electric field of the third sub-radiator 41 in the tuned sub-frequency band to a certain extent, thereby achieving better antenna radiation efficiency even in the case of hand contact. Similarly, according to the size of the contact area between the hand and the fourth sub-radiator 42, the fourth switch switching circuit T4 intelligently tunes the sub-frequency band supported by the third resonant mode.

[0228] The contact area between the hand and the second radiator 40 can be indicated by the capacitance value detected by the proximity sensor based on the capacitance principle or the SAR sensor based on the capacitance principle. When the hand does not touch the second radiator 40, the sensor for detecting the contact area between the hand and the second radiator 40 has an initial capacitance. When the hand touches the second radiator 40, the detection capacitance value of the sensor changes and increases as the contact area increases.

[0229] The third switch switching circuit T3 is used to switch the third resonance mode to support at least one of the B5 band and the B8 band when the contact area between the hand and the third sub-radiator 41 is a first preset area, wherein the first preset area is, for example, the contact area between the thumb tip and the third sub-radiator 41; and / or, the fourth switch switching circuit T4 is used to switch the third resonance mode to support at least one of the B71 band and the B28 band when the contact area between the hand and the fourth sub-radiator 42 is a second preset area, wherein the second preset area is, for example, the contact area between the thumb tip and the fourth sub-radiator 42.

[0230] Furthermore, when the third sub-radiator 41 works alone, the third switch circuit T3 is used to switch the sub-band of the second frequency band according to the contact area between the hand and the third sub-radiator 41 .

[0231] When the fourth sub-radiator 42 works alone, the fourth switch circuit T4 is used to switch the sub-band of the second frequency band according to the contact area between the hand and the fourth sub-radiator 42 .

[0232] When the third sub-radiator 41 and the fourth sub-radiator 42 work simultaneously and the contact area between the hand and the third sub-radiator 41 and the contact area between the hand and the fourth sub-radiator 42 are the same, the third switch switching circuit T3 is used to switch the sub-band of the second frequency band according to the size of the contact area between the hand and the third sub-radiator 41, and the fourth switch switching circuit T4 is used to switch the sub-band of the second frequency band according to the size of the contact area between the hand and the fourth sub-radiator 42.

[0233] When the third sub-radiator 41 and the fourth sub-radiator 42 work at the same time and the contact area between the hand and the third sub-radiator 41 and the contact area between the hand and the fourth sub-radiator 42 are different, the third switch switching circuit T3 is used to switch the sub-band of the second frequency band according to the size of the contact area between the hand and the third sub-radiator 41, and the fourth switch switching circuit T4 is used to switch the sub-band of the second frequency band according to the size of the contact area between the hand and the third sub-radiator 41; or, the third switch switching circuit T3 is used to switch the sub-band of the second frequency band according to the size of the contact area between the hand and the fourth sub-radiator 42, and the fourth switch switching circuit T4 is used to switch the sub-band of the second frequency band according to the size of the contact area between the hand and the fourth sub-radiator 42.

[0234] See also Fig.18a and Fig.18bThe opening position (antenna slot) of the third sub-radiator 41 is located above the thumb of the left hand and above the middle finger of the right hand. The antenna slot position of the fourth sub-radiator 42 should be avoided from being held by the palm of the hand.

[0235] See also Fig.29 , Fig.29 The S11 parameter curves of the third sub-radiator 41 working alone, the fourth sub-radiator 42 working alone, and the co-feed antenna (the third sub-radiator 41 and the fourth sub-radiator 42 working simultaneously) are compared. It can be seen that the co-feed antenna has a better working bandwidth of S11<-4dB, indicating that it can better excite the reference floor 600 for effective radiation.

[0236] See also Fig.30 , Fig.30 yes Fig.21 The radiation performance curves of the third sub-radiator 41 working alone in the B28 frequency band, the fourth sub-radiator 42 working alone in the B28 frequency band and the co-feed antenna (the third sub-radiator 41 and the fourth sub-radiator 42 working simultaneously) working in the B28 frequency band are compared. It can be seen that in the B28 frequency band (0.703-0.803GHz), the average radiation efficiency of the co-feed antenna is 0.8dB and 1.5dB higher than the radiation efficiency of the third sub-radiator 41 and the fourth sub-radiator 42, respectively. When the third sub-radiator 41 works alone, the fourth sub-radiator 42 works alone and the co-feed antenna works, the average system efficiency is -6.5dB, -8.1dB and -9.1dB, respectively. The system efficiency of the co-feed antenna is about 1.6dB better than that of the third sub-radiator 41 unit working alone. The system efficiency of the co-feed antenna is 6dB better than that of the fourth sub-radiator 42 unit working alone.

[0237] Generally, the electric field near the conductive frame 320 is perpendicular to the conductive frame 320, and the electric field at the antenna slot is parallel to the conductive frame 320. When a person's hand touches the conductive frame 320, the perpendicular electric field can stimulate the hand to act as an effective second radiator 40, while the parallel electric field will enter the human body and be lost inside the human body. Fig. 20 In the figure, the thumb is in contact with the third sub-radiator 41, and the vertical electric field near the third sub-radiator 41 will stimulate the thumb, which has a certain improvement effect on the radiation performance of the B5 / B8 frequency band; the palm part is in contact with the fourth sub-radiator 42, and the vertical electric field of the fourth sub-radiator 42 will stimulate the palm part, which has a certain improvement effect on the radiation performance of the B28 / B71 frequency band.

[0238] So for Fig.18a and Fig.18bIn the embodiment, the antenna slot of the third sub-radiator 41 is required to be higher than the thumb and the middle finger, so as to stimulate the radiation of the thumb and prevent the parallel electric field of the antenna slot from entering the hand and causing loss. The position of the bottom antenna slot is also to prevent the electric field of the slot from entering the palm and causing loss, and to use the antenna frame 320 to stimulate the palm.

[0239] See also Fig.31 , Fig.31 It is a comparison of the efficiency of the co-fed antenna formed by the third sub-radiator 41 and the fourth sub-radiator 42 in the left-hand holding scenario, the right-hand holding scenario and the free space in the B28 frequency band. Fig.32 This is a comparison of the efficiency of the co-fed antenna formed by the third sub-radiator 41 and the fourth sub-radiator 42 in the left-handed holding scenario, the right-handed holding scenario and the free space in the B8 frequency band. It can be seen that for the B28 frequency band, the system efficiency of the free space is -6.5dB, the system efficiency of the left-handed holding scenario is -7.8dB, and the system efficiency of the right-handed holding scenario is -7.6dB. The hand-held drop is about 1.3dB, which is a small drop. For the B8 frequency band, the system efficiency of the free space is -6.8dB, the system efficiency of the left-handed holding scenario is -7.4, and the system efficiency of the right-handed holding scenario is -6.9dB. The hand-held drop is about 0.6dB, which is a small drop.

[0240] Please refer to Table 1, which shows the system efficiency of the co-fed antenna in free space, right-handed holding scenario, left-handed holding scenario, right-handed holding call scenario, and left-handed holding call scenario. It can be found that the head-hand reduction is 2.1 to 3.8 dB, and the head-hand reduction is also relatively small.

[0241] Table 1

[0242] Frequency band Free Space Right hand Left Hand right hand Left Head Hand B28 -6.5dB -7.8dB -7.6dB -10.3dB -9.6dB B5 -6.8dB -7.4dB -6.9dB -10.6dB -8.9dB

[0243] The electronic device provided in the present application is designed such that the second radiator 40 includes a third sub-radiator 41 and a fourth sub-radiator 42 which are connected or adjacent to each other, the third sub-radiator 41 includes a third grounding point D2, a third feeding point C2 and a third free end A2 which are arranged in sequence, the fourth sub-radiator 42 includes a fourth grounding point E2, a fourth feeding point F2 and a fourth free end H2 which are arranged in sequence, the fourth grounding point E2 is located on a side of the third feeding point C2 away from the third free end A2, the third grounding point D2 and the fourth grounding point E2 are both grounded, and a second feeding network 50 is designed to electrically connect the third feeding point C2 and the fourth feeding point F2, the second feeding network 50 is used to provide an excitation signal of a third phase to the third sub-radiator 41 via the third feeding point C2, and the second feeding network 50 is used to provide an excitation signal of a third phase to the third sub-radiator 41 via the fourth feeding point F 2 provides an excitation signal of a fourth phase to the fourth sub-radiator 42, so as to excite the third sub-radiator 41 and the fourth sub-radiator 42 to jointly form a third resonance mode supporting the second frequency band. The excitation signal of the third phase forms a third floor current on the reference floor 600, and the excitation signal of the fourth phase forms a fourth floor current on the reference floor 600. The third floor current and the fourth floor current are superimposed in the length direction of the reference floor 600 and at least partially offset in the width direction of the reference floor 600. Therefore, when the antenna component works in the third resonance mode, a longitudinal current mode in the length direction is formed on the reference floor 600, while a transverse current in the width direction is very small, so that the current in the direction of the longer dimension on the reference floor 600 is effectively excited, so as to obtain higher antenna radiation efficiency and improve the working bandwidth.

[0244] The embodiment of the present application realizes a common-ground inductively fed IFA antenna based on a more easily realized common feeding method, and uses the different lengths between the fourth transmission line 502 and the fifth transmission line 503 to obtain a certain signal phase difference, so that the transverse mode and longitudinal mode currents excited by the third sub-radiator 41 and the fourth sub-radiator 42 are correspondingly destructive and constructive, thereby better exciting the current of the reference floor 600, and achieving the improvement of radiation efficiency and working bandwidth under the radiation conditions of small clearance and narrow frame 320, so that the antenna has better free space OTA performance, so as to meet the operator's OTA indicators. Using a shared return ground form and an inductive feeding method, the feeding points of the third sub-radiator 41 and the fourth sub-radiator 42 are located closer, avoiding the large transmission loss caused by the fourth transmission line 502 and the fifth transmission line 503 when transmitting signals. The third sub-radiator 41 and the fourth sub-radiator 42 are fed simultaneously by the power division network (the fourth transmission line 502 / the fifth transmission line 503 / the sixth transmission line 504), so that the third sub-radiator 41 and the fourth sub-radiator 42 can work simultaneously, and the handheld performance of the low-frequency band and the full-band is obtained through the third switch switching circuit T3 and the fourth switch switching circuit T4. In addition, the antenna slot position is reasonably selected based on the hand holding position, and the slot of the third sub-radiator 41 is designed to be higher than the thumb and the middle finger, and the slot of the fourth sub-radiator 42 is away from the palm, so as to improve the performance of the electronic device 1000 in the handheld scenario; the third sub-radiator 41 stimulates the thumb to radiate effectively in the B5 / B8 frequency band, and the fourth sub-radiator 42 stimulates the palm to radiate effectively in the B71 / 28 frequency band, and the antenna can stimulate the human hand to radiate in the full low-frequency band, so as to obtain a very low handheld drop, so that users can obtain an excellent actual communication experience.

[0245] The embodiment of the present application designs a low-frequency antenna architecture based on the position of a person's hand holding a mobile phone and the usage scenarios of holding it vertically or holding it horizontally with both hands. The architecture covers all frequency bands of low-frequency (0.617-0.96 GHz) communications and achieves free-space OTA performance or better than free-space performance when held horizontally with both hands. At the same time, good free-space and handheld performance can be achieved when held vertically. The good vertical holding and two-handed horizontal holding performance enable the above-mentioned low-frequency architecture design to meet the actual needs of users and obtain a superior user experience.

[0246] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. An electronic device, characterized in that: The device comprises a frame and an antenna assembly, wherein the frame comprises a top frame, a bottom frame and a pair of side frames connected between the top frame and the bottom frame, each of the side frames comprises a horizontal screen free area and two horizontal screen holding areas respectively arranged on both sides of the horizontal screen free area, the horizontal screen holding area is an area on the side frame that is held by the hand when the screen is held in horizontal mode, and the horizontal screen free area is an area on the side frame that is not held by the hand when the screen is held in horizontal mode; The antenna assembly includes at least one first radiator and a first signal source, each of the first radiators includes a first radiating section and a second radiating section connected to each other, the first radiating section is arranged in the horizontal screen holding area, the end of the second radiating section away from the first radiating section is a free end, and the second radiating section is arranged in the horizontal screen free area; The first signal source is electrically connected to the first radiator, and the first signal source is used to excite the first radiator to form a first resonance mode that supports a first frequency band. The electric field formed by the first radiating segment under the first resonance mode excites the hand to participate in radiation when the screen is held horizontally.

2. The electronic device according to claim 1, wherein: At least one of the first radiators includes at least one first sub-radiator, the first sub-radiator's first radiating segment is arranged in the horizontal screen holding area adjacent to the top frame, the first sub-radiator also includes a third radiating segment, the third radiating segment is connected to the first radiating segment of the first sub-radiator at one end away from the second radiating segment of the first sub-radiator, and the third radiating segment is arranged in the top frame.

3. The electronic device according to claim 2, characterized in that: At least one of the first radiators also includes at least one second sub-radiator, the first radiating segment of the second sub-radiator is arranged in the horizontal screen holding area adjacent to the bottom frame, the second radiating segment of the second sub-radiator is spaced apart from the second radiating segment of the first sub-radiator, the second sub-radiator also includes a fourth radiating segment, the fourth radiating segment is connected to the end of the first radiating segment of the second sub-radiator away from the second radiating segment of the second sub-radiator, and the fourth radiating segment is arranged in the bottom frame.

4. The electronic device according to claim 3, characterized in that: The electronic device further comprises a reference floor arranged in the frame, the first sub-radiator comprises a first grounding point, a first feeding point and a first free end arranged in sequence, and the first grounding point is electrically connected to the reference floor; The second sub-radiator comprises a second grounding point, a second feeding point and a second free end which are arranged in sequence, the second free end and the first free end are arranged on the same side frame and are spaced apart, and the second grounding point is electrically connected to the reference ground; The antenna assembly also includes a first feeding network, which electrically connects the first feeding point, the second feeding point and the first signal source, and the first signal source is used to provide an excitation signal of a first phase to the first sub-radiator via the first feeding network and the first feeding point. The first signal source is also used to provide an excitation signal of a second phase to the second sub-radiator via the first feeding network and the second feeding point to excite the first sub-radiator and the second sub-radiator to jointly form a second resonant mode supporting the first frequency band, and the main current formed by the second resonant mode on the reference floor is a longitudinal current distributed along the length direction of the reference floor.

5. The electronic device according to claim 4, characterized in that: The excitation signal of the first phase forms a first floor current on the reference floor, and the excitation signal of the second phase forms a second floor current on the reference floor. The first floor current and the second floor current are superimposed in the length direction of the reference floor, and the first floor current and the second floor current are at least partially offset in the width direction of the reference floor.

6. The electronic device according to claim 4, characterized in that: The phase difference between the first phase and the second phase is a first preset phase difference, so that the second resonance mode forms the longitudinal current on the reference ground.

7. The electronic device according to claim 6, characterized in that: The first sub-radiator and the second sub-radiator are mirror-symmetrical structures, and the first preset phase difference is 180°±20°.

8. The electronic device according to claim 6, characterized in that: The first feeding network includes a first transmission line, a second transmission line and a third transmission line, one end of the first transmission line is electrically connected to the first feeding point, one end of the second transmission line is electrically connected to the second feeding point, the other end of the first transmission line is electrically connected to the other end of the second transmission line and one end of the third transmission line, and the other end of the third transmission line is electrically connected to the first signal source.

9. The electronic device according to claim 8, characterized in that: The difference between the length of the first transmission line and the length of the second transmission line is a first preset length, so that the phase difference between the first phase and the second phase is the first preset phase difference.

10. The electronic device according to claim 4, characterized in that: The second resonant mode includes a 1 / 4 wavelength mode supporting the first frequency band formed between the first free end and the first grounding point and a 1 / 4 wavelength mode supporting the first frequency band formed between the second free end and the second grounding point, and the resonant current between the first free end and the first grounding point has the same direction as the resonant current between the second grounding point and the second free end.

11. The electronic device according to claim 8, characterized in that: The antenna assembly also includes a first switch unit, one end of the first switch unit is electrically connected to one end of the third transmission line, and the other end of the first switch unit can be selectively electrically connected to the other end of the first transmission line, so that the first sub-radiator operates in a single feed mode; or, the other end of the first switch unit can be selectively electrically connected to the other end of the second transmission line, so that the second sub-radiator operates in a single feed mode; or, the other end of the first switch unit can be selectively electrically connected to the other end of the first transmission line and the other end of the second transmission line, so that the first sub-radiator and the second sub-radiator work together in a dual feed mode.

12. The electronic device according to any one of claims 3 to 10, characterized in that: The pair of side frames includes a first side frame and a second side frame which are arranged opposite to each other; The number of the first sub-radiators is two, and the two first sub-radiators are respectively arranged on the first side frame and the second side frame; the number of the second sub-radiators is two, and the two second sub-radiators are respectively arranged on the first side frame and the second side frame; the first sub-radiator and the second sub-radiator arranged on the first side frame form a first radiator group, and the first sub-radiator and the second sub-radiator arranged on the second side frame form a second radiator group; The antenna assembly also includes a second switch unit, one end of which is electrically connected to the first signal source, and the second switch unit is also electrically connected to the first radiator group and the second radiator group. The second switch unit is used to switch to the first radiator group or to the second radiator group according to the signal strength.

13. The electronic device according to any one of claims 4 to 10, characterized in that: The antenna assembly further includes a first switch switching circuit, one end of the first switch switching circuit is electrically connected between the first feeding point and the first free end, the other end of the first switch switching circuit is grounded, and the first switch switching circuit is used to switch a sub-band of the first frequency band; and / or, The antenna assembly also includes a second switch switching circuit, one end of the second switch switching circuit is electrically connected between the second feeding point and the second free end, the other end of the second switch switching circuit is grounded, and the second switch switching circuit is used to switch the sub-band of the first frequency band; the first frequency band includes a low frequency.

14. The electronic device according to any one of claims 1 to 10, characterized in that: Each of the side frames comprises a vertical screen free area and a vertical screen holding area, wherein the vertical screen holding area is an area on the side frame that is held by the hand when the screen is held vertically, and the vertical screen free area is an area on the side frame that is not held by the hand when the screen is held vertically; The antenna assembly also includes a second radiator and a second signal source. The second radiator and the first radiator are respectively arranged on different side frames. The second radiator includes a third sub-radiator and a fourth sub-radiator that are connected or adjacent. The end of the third sub-radiator facing away from the fourth sub-radiator is a third free end, and the third free end is arranged in the vertical screen free area. The end of the fourth sub-radiator facing away from the third sub-radiator is a fourth free end, and the fourth free end is arranged in the vertical screen free area on the bottom frame. The second signal source is electrically connected to the second radiator, and is used to excite the second radiator to form a third resonant mode that supports the second frequency band.

15. The electronic device according to claim 14, characterized in that: The third sub-radiator includes a third grounding point, a third feeding point and the third free end which are arranged in sequence; the fourth sub-radiator includes a fourth grounding point, a fourth feeding point and the fourth free end which are arranged in sequence, the fourth grounding point is located on a side of the third feeding point away from the third free end, and the third grounding point and the fourth grounding point are both electrically connected to a reference ground; and The antenna assembly also includes a second feeding network, which is electrically connected to the third feeding point and the fourth feeding point. The second signal source is used to provide an excitation signal of a third phase to the third sub-radiator via the second feeding network and the third feeding point. The second signal source is also used to provide an excitation signal of a fourth phase to the fourth sub-radiator via the second feeding network and the fourth feeding point to excite the third sub-radiator and the fourth sub-radiator to jointly form the third resonant mode. The main current formed by the third resonant mode on the reference floor is a longitudinal current distributed along the length direction of the reference floor.

16. The electronic device according to claim 15, characterized in that: The excitation signal of the third phase forms a third floor current on the reference floor, and the excitation signal of the fourth phase forms a fourth floor current on the reference floor. The third floor current and the fourth floor current are superimposed in the length direction of the reference floor, and the third floor current and the fourth floor current are at least partially offset in the width direction of the reference floor.

17. The electronic device according to claim 15, characterized in that: The difference between the third phase and the fourth phase is a second preset phase difference, and the second preset phase difference is 0°±20°, so that the third resonance mode forms the longitudinal current on the reference ground.

18. The electronic device according to claim 15, characterized in that: The second feeding network includes a fourth transmission line, a fifth transmission line and a sixth transmission line, one end of the fourth transmission line is electrically connected to the third feeding point, one end of the fifth transmission line is electrically connected to the fourth feeding point, the other end of the fourth transmission line is electrically connected to the other end of the fifth transmission line and one end of the sixth transmission line, and the other end of the sixth transmission line is electrically connected to the second signal source.

19. The electronic device according to claim 15, characterized in that: The third resonant mode includes a 1 / 4 wavelength mode supporting the second frequency band formed between the third free end and the third grounding point and a 1 / 4 wavelength mode supporting the second frequency band formed between the fourth free end and the fourth grounding point, and the resonant current between the third free end and the third grounding point has the same direction as the resonant current between the fourth grounding point and the fourth free end.

20. The electronic device according to claim 18, characterized in that The antenna assembly also includes a third switch unit, one end of the third switch unit is electrically connected to one end of the sixth transmission line, and the other end of the third switch unit can be selectively electrically connected to the other end of the fourth transmission line, so that the third sub-radiator operates in a single feed mode; or, the other end of the third switch unit can be selectively electrically connected to the other end of the fifth transmission line, so that the fourth sub-radiator operates in a single feed mode; or, the other end of the third switch unit can be selectively electrically connected to the other end of the fourth transmission line and the other end of the fifth transmission line, so that the third sub-radiator and the fourth sub-radiator work together in a dual feed mode.

21. The electronic device according to any one of claims 15 to 20, characterized in that: The antenna assembly further includes a third switch switching circuit, one end of the third switch switching circuit is electrically connected between the third feeding point and the third free end, the other end of the third switch switching circuit is grounded, and the third switch switching circuit is used to switch a sub-band of the second frequency band; and / or, The antenna assembly also includes a fourth switch switching circuit, one end of the fourth switch switching circuit is electrically connected between the fourth feed point and the fourth free end, the other end of the fourth switch switching circuit is grounded, and the fourth switch switching circuit is used to switch the sub-band of the second frequency band; the second frequency band includes a low frequency.

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