Electronic device

Abstract

According to the electronic equipment provided by the invention, at least part of a first radiating body is arranged on a first edge, and the first radiating body comprises a first grounding end, a first feeding point and a first free end which are arranged in sequence; at least part of the second radiator is arranged on the second side, and the second radiator comprises a second grounding end and a second free end which are arranged in sequence; when the electronic equipment is in a folded state, the first radiator is coupled with the second radiator, the first signal source excites the first radiator to form a first resonant mode supporting a first frequency band and excites the second radiator to form a second resonant mode supporting a second frequency band, and the second resonant mode is a 3 / 4 wavelength mode of the second frequency band. The direction of at least part of resonance current of the second resonance mode on the second radiator is the same as the direction of at least part of resonance current of the first resonance mode on the first radiator, and the second resonance mode is used for improving the efficiency of the first frequency band. The invention provides an electronic device capable of improving the performance of a folded antenna.

Description

Technical Field

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

[0002] Electronic devices that can be unfolded and folded have attracted more and more attention because they have a large display screen when unfolded and occupy a small space and are easy to carry when folded. However, the performance of some antennas of electronic devices deteriorates seriously after being folded, which affects the user experience. Therefore, how to improve the antenna performance of electronic devices after being folded has become a technical problem that needs to be solved. Summary of the invention

[0003] The present application provides an electronic device that improves antenna performance after folding.

[0004] The present application provides an electronic device, comprising a first body, a second body and an antenna assembly, wherein the first body and the second body are movably connected so that the electronic device is in a folded state or an unfolded state, the first body comprises a first edge, the second body comprises a second edge, and when the electronic device is in the folded state, the first edge and the second edge are opposite to each other in a thickness direction of the electronic device;

[0005] The antenna assembly comprises:

[0006] A first radiator, at least partially disposed on the first side, the first radiator comprising a first grounding end, a first feeding point and a first free end disposed in sequence;

[0007] a first signal source, the first signal source being electrically connected to the first feeding point, and the first signal source being used to feed an excitation current to the first radiator;

[0008] A second radiator, at least partially disposed on the second side, the second radiator comprising a second grounding end and a second free end disposed in sequence;

[0009] When the electronic device is in a folded state, the first radiator is coupled to the second radiator, the first signal source excites the first radiator to form a first resonance mode supporting a first frequency band and excites the second radiator to form a second resonance mode supporting a second frequency band, the second resonance mode is a 3 / 4 wavelength mode of the second frequency band, and the direction of at least part of the resonance current of the second resonance mode on the second radiator is the same as the direction of at least part of the resonance current of the first resonance mode on the first radiator, and the second resonance mode is used to improve the efficiency of the first frequency band.

[0010] The electronic device provided by the present application has a first radiator and a second radiator respectively arranged on a first side and a second side of the electronic device, the first radiator includes a first ground end, a first feeding point and a first free end arranged in sequence, the first signal source is electrically connected to the first feeding point, the second radiator includes a second ground end and a second free end arranged in sequence, when the electronic device is in a folded state, the first radiator is coupled with the second radiator, the first signal source excites the first radiator to form a first resonance mode supporting the first frequency band and excites the second radiator to form a second resonance mode supporting the second frequency band, the second resonance mode is a 3 / 4 wavelength mode of the second frequency band, and the direction of at least part of the resonance current of the second resonance mode on the second radiator is the same as the direction of at least part of the resonance current of the first resonance mode on the first radiator, and the second resonance mode is used to improve the efficiency of the first frequency band and improve the antenna performance of the electronic device after folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0013] Figure 2 is a partial exploded schematic diagram of an electronic device provided in an embodiment of the present application;

[0014] Figure 3 is a partial top view of an electronic device provided by an embodiment of the present application;

[0015] Figure 4 is a structural schematic diagram of a first antenna assembly provided in an embodiment of the present application;

[0016] Figure 5 It is a schematic diagram of current distribution in which the resonant frequency of the first radiator on the first antenna assembly provided in an embodiment of the present application is higher than the resonant frequency of the second radiator;

[0017] Figure 6 is a schematic diagram of current distribution in which the resonant frequency of the first radiator is lower than the resonant frequency of the second radiator on the second antenna assembly provided in an embodiment of the present application;

[0018] Figure 7 is an S parameter curve of the first antenna assembly provided in an embodiment of the present application;

[0019] Figure 8 is an efficiency curve of the first antenna assembly provided in an embodiment of the present application;

[0020] Fig. 9 is an S parameter curve of the second antenna assembly provided in an embodiment of the present application;

[0021] Fig.10 is an efficiency curve of the second antenna assembly provided in an embodiment of the present application;

[0022] Fig.11 is a structural schematic diagram of a first antenna assembly provided in an embodiment of the present application, including a first switch tuning circuit;

[0023] Fig.12 is a structural schematic diagram of a first switch tuning circuit provided in an embodiment of the present application, including a first sub-switch and a capacitive element;

[0024] Fig.13 is a structural schematic diagram of a first switch tuning circuit provided in an embodiment of the present application including a second sub-switch and an inductor element;

[0025] Fig.14 is a structural schematic diagram of a third antenna assembly having a switch unit and a second signal source provided in an embodiment of the present application;

[0026] Fig.15 is a structural schematic diagram of a fourth antenna assembly having a switch unit and a second signal source provided in an embodiment of the present application;

[0027] Fig.16 is a schematic structural diagram of a fifth antenna assembly with a third radiator provided in an embodiment of the present application;

[0028] Fig.17 yes Fig.16 A schematic diagram of a first current distribution on a fifth antenna assembly is provided;

[0029] Fig.18 yes Fig.16 A schematic diagram of a second current distribution on a fifth antenna assembly is provided;

[0030] Fig.19 yes Fig.16 A schematic diagram of a third current distribution on a fifth antenna assembly is provided;

[0031] Fig. 20 yes Fig.16 A fourth current distribution schematic diagram on a fifth antenna assembly is provided;

[0032] Fig.21 yes Fig.16 A fifth current distribution schematic diagram on a fifth antenna assembly is provided;

[0033] Fig. 22 is a structural schematic diagram of a sixth antenna assembly with a third radiator provided in an embodiment of the present application;

[0034] Fig.23is a structural schematic diagram of a fifth antenna assembly provided in an embodiment of the present application including a second switch tuning circuit;

[0035] Fig.24 is a structural schematic diagram of a seventh antenna assembly with a fourth radiator provided in an embodiment of the present application;

[0036] Fig.25 yes Fig.24 A schematic diagram of a first current distribution on a seventh antenna assembly is provided;

[0037] Fig.26 yes Fig.24 A second current distribution schematic diagram on a seventh antenna assembly is provided;

[0038] Fig. 27 is a structural schematic diagram of a seventh antenna assembly provided in an embodiment of the present application having a third switch tuning circuit;

[0039] Fig.28 yes Fig.24 A third current distribution schematic diagram on a seventh antenna assembly is provided;

[0040] Fig.29 yes Fig.24 A schematic diagram of a fourth current distribution on a seventh antenna assembly is provided;

[0041] Fig.30 yes Fig.24 A schematic diagram of the distribution of the seventh antenna assembly provided on the frame;

[0042] Fig.31 yes Fig.30 A partial schematic diagram of an electronic device when folded is provided;

[0043] Fig.32 yes Fig.30 A partial schematic diagram of another electronic device when folded is provided.

[0044] Description of Figure Numbers:

[0045] Electronic device 1000; first body 10; second body 20; antenna assembly 30; display screen 200; middle frame 300; back cover 400; frame 320; middle plate 310; first frame 321; second frame 322; first middle plate 311; second middle plate 312; first back cover 410; second back cover 420; top edge 111; first side edge 113; second side edge 114; bottom edge 131; third side edge 133; fourth side edge 134; reference floor 500; first radiator 1; first signal source 2; second radiator 3; first ground terminal A1; first feeding point B1; first free end C1; second ground terminal A2; second free end C2; first A reverse point O1; a second reverse point O2; a first connection point J1; a first switch tuning circuit T1; a first sub-switch T11; a matching element T12; a capacitor element C0; a second sub-switch T13; an inductor element L0; a second feeding point B2; a switch unit 5; a second signal source 4; a matching branch M0; a third radiator 6; a third ground terminal A3; a third free end C3; a second connection point J2; a second switch tuning circuit T2; a third sub-switch T21; a first tuning branch T22; a fourth radiator 7; a fourth ground terminal A4; a fourth free end C4; a third connection point J3; a third switch tuning circuit T3; a fourth sub-switch T31; and a second tuning branch T32. DETAILED DESCRIPTION

[0046] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0047] 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.

[0048] 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.

[0049] See also Figure 1 , Figure 1 A schematic diagram of a foldable electronic device 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, and other devices with communication functions and capable of being folded or unfolded. The present application embodiment is described using a mobile phone as an example, and other electronic devices may refer to this embodiment.

[0050] For ease of description, see Figure 2 , the thickness direction of the electronic device 1000 is defined as the Z-axis direction, the length direction is the Y-axis direction, and the width direction is the X-axis direction, and the Z-axis, Y-axis, and X-axis are perpendicular to each other. This application does not limit the size of the electronic device 1000 in the length direction and the width direction. In some embodiments, the size of the electronic device 1000 in the length direction is greater than the size in the width direction, and in other embodiments, the size of the electronic device 1000 in the width direction is greater than or equal to the size in the length direction.

[0051] See also Figure 3 The electronic device 1000 provided in the embodiment of the present application at least includes a first body 10, a second body 20 and an antenna assembly 30. The first body 10 and the second body 20 are movably connected to make the electronic device 1000 present in a folded state or an unfolded state. In the embodiment of the present application, the movably connected is not limited to a sliding connection, a rotating connection, or a combination of rotating and sliding, so that the first body 10 and the second body 20 are transformed from a folded state to an unfolded state, or from an unfolded state to a folded state.

[0052] Optionally, the first body 10 is the upper half of the electronic device 1000, and the second body 20 is the lower half of the electronic device 1000. When the electronic device 1000 is in the unfolded vertical screen usage state, the lower half of the electronic device 1000 is the part facing the ground.

[0053] The environment in which the antenna assembly 30 is located is exemplified below with reference to the accompanying drawings. The embodiment of the present application is exemplified by taking the rotational connection between the first body 10 and the second body 20 as an example.

[0054] See also Figure 2, the working environment of the antenna assembly 30 is illustrated by taking the electronic device 1000 as a mobile phone as an example. 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 periphery of the middle plate 310. The display screen 200, the middle plate 310 and the back cover 400 are arranged in sequence, and a receiving space is formed between the display screen 200 and the middle plate 310, and between the middle plate 310 and the back cover 400 to accommodate 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 integrated structure, and the frame 320 and the back cover 400 can be a split structure. In other embodiments, the frame 320 and the back cover 400 may be an integral structure, or the frame 320 and the back cover 400 may be a separate structure. The above is the working environment of the antenna assembly 30 taking a mobile phone as an example, but the antenna assembly 30 of the present application is not limited to the above working environment.

[0055] See also Figure 2 The frame 320 includes a first frame 321 and a second frame 322 that are rotatably connected. The middle plate 310 includes a first middle plate 311 and a second middle plate 312 that are rotatably connected. The back cover 400 includes a first back cover 410 and a second back cover 420 that are rotatably connected. The first frame 321, the first middle plate 311, and the first back cover 410 are part of the first body 10. The second frame 322, the second middle plate 312, and the second back cover 420 are part of the second body 20.

[0056] The electronic device 1000 has a folded state or an unfolded state. In the folded state, the first body 10 and the second body 20 are stacked in the thickness direction (Z-axis direction), specifically, along the Z-axis direction, the first body 10 and the second body 20 are respectively arranged in the upper and lower layers.

[0057] See also Figure 3, the first frame 321 includes a first side 113, a top 111, and a second side 114 connected in sequence. The second frame 322 includes a third side 133, a bottom 131, and a fourth side 134 connected in sequence. Wherein, when the electronic device 1000 is in the unfolded state, the top 111 and the bottom 131 are respectively located at the top and bottom sides of the electronic device 1000, the first side 113 and the third side 133 are collinearly arranged, and the second side 114 and the fourth side 134 are collinearly arranged. When the electronic device 1000 is in the folded state, the first side 113 and the third side 133 are aligned and spaced apart, the second side 114 and the fourth side 134 are aligned and spaced apart, and the top 111 and the bottom 131 are aligned and spaced apart.

[0058] See also Figure 3 The electronic device 1000 further includes a reference floor 500 disposed inside the frame 320 .

[0059] See also Figure 4 The antenna component 30 includes a first radiator 1, a first signal source 2 and a second radiator 3.

[0060] The material of the first radiator 1 is a conductive material, including but not limited to metal, alloy, conductive oxide, conductive polymer, graphene, etc. The form of the first radiator 1 includes but is not limited to the metal frame of the mobile phone, the metal frame embedded in the plastic frame, the metal radiator located in the frame or on the surface, the flexible printed circuit board antenna formed on the flexible printed circuit board (Flexible Printed Circuit board, FPC), the laser direct structured antenna by laser direct structure (Laser Direct Structuring, LDS), the printed direct structured antenna by printing direct structure (Print Direct Structuring, PDS), the conductive sheet antenna (such as a metal bracket antenna), etc. In this embodiment, the first radiator 1 takes the metal frame of the mobile phone as an example.

[0061] Optionally, the present application does not specifically limit the shape of the first radiator 1. For example, the shape of the first radiator 1 includes but is not limited to a strip, a sheet, a rod, a coating, a film, and the like. Figure 4 The first radiator 1 shown is only an example and does not limit the shape of the first radiator 1 provided in the present application. The present application does not limit the extension trajectory of the first radiator 1. The extension trajectory of the first radiator 1 is a straight line, a bend, a curve, etc. The material, shape, and extension trajectory of the second radiator 3 can refer to the material, shape, and extension trajectory of the first radiator 1.

[0062] See also Figure 3 At least part of the first radiator 1 is disposed on the first side of the first body 10. The first side of the first body 10 includes but is not limited to any one of the top side 111, the first side 113, and the second side 114 of the first frame 321.

[0063] See also Figure 4 , the first radiator 1 includes a first ground terminal A1, a first feeding point B1 and a first free end C1 which are arranged in sequence. The first free end C1 is an end where an insulating gap is arranged on the frame. The present application does not specifically limit the position of the first feeding point B1 on the first radiator 1. The first ground terminal A1 is electrically connected to the reference floor 500. The electrical connection method includes but is not limited to methods such as through conductive springs, physical connection (interconnected as one), welding, through coaxial lines, through microstrip lines, through conductive adhesives, etc.

[0064] The first signal source 2 is electrically connected to the first feeding point B1 , and the first signal source 2 is used to feed an excitation current to the first radiator 1 .

[0065] Optionally, the signal source 24 includes but is not limited to a radio frequency transceiver chip, etc. The signal source 24 is used to transmit a radio frequency signal (radio frequency current), and the radio frequency signal is transmitted to the first radiator 1 to excite the first radiator 1 to generate a resonant current and form a resonant mode to receive or transmit an electromagnetic wave signal covering a required frequency band, covering the frequency band corresponding to the resonant current.

[0066] See also Figure 3 At least part of the second radiator 3 is disposed on the second side. The second side of the second body 20 includes but is not limited to any one of the bottom side 131 , the third side 133 , and the fourth side 134 of the second frame 322 .

[0067] See also Figure 4 The second radiator 3 includes a second grounding end A2 and a second free end C2 which are arranged in sequence. The second grounding end A2 is used for grounding, and the second free end C2 is an end portion of the second frame 322 where an insulating gap is arranged.

[0068] The first radiator 1 and the second radiator 3 are respectively arranged on the first body 10 and the second body 20. When the electronic device 1000 is in a folded state, the first radiator 1 is coupled with the second radiator 3, and the coupling mode is capacitive coupling. The first radiator 1 conducts the excitation current of the first signal source 2 to the second radiator 3 to excite the second radiator 3 to generate a resonant current. Optionally, the first radiator 1 and the second radiator 3 are at least partially opposite in the thickness direction and are arranged at intervals when in the folded state. Optionally, the first radiator 1 and the second radiator 3 are not opposite in the thickness direction (i.e., staggered) when in the folded state, but the first free end C1 and the second free end C2 are close to each other, for example, less than 5 mm, thereby forming capacitive coupling.

[0069] When the electronic device 1000 is in a folded state, the first radiator 1 and the second radiator 3 are arranged in parallel.

[0070] The first signal source 2 excites the first radiator 1 to form a first resonance mode supporting a first frequency band and excites the second radiator 3 to form a second resonance mode supporting a second frequency band.

[0071] Optionally, the first frequency band includes but is not limited to at least one of the LB frequency band (less than or equal to 1 GHz), the MHB frequency band (greater than 1 GHz and less than or equal to 3 GHz), the UHB frequency band (greater than 3 GHz), the GPS frequency band, and the Wi-Fi frequency band. For example, the first frequency band is the MHB frequency band.

[0072] Optionally, the first radiator 1 includes but is not limited to an IFA antenna, and the first resonance mode is a 1 / 4 wavelength mode. Further, the electrical length of the first radiator 1 is close to or equal to 1 / 4 wavelength of the center frequency of the first frequency band.

[0073] Optional, see Figure 5 The current I3 of the first resonance mode flows from the first ground terminal A1 to the first free terminal C1, or flows from the first free terminal C1 to the first ground terminal A1.

[0074] The electrical length described in this application can satisfy the following formula:

[0075]

[0076] 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 free space.

[0077] Optionally, the distance between the first feeding point B1 and the first free end C1 is relatively close, and the first resonant mode is a CRLH mode (left-hand composite mode). Further, the electrical length of the first radiator 1 is less than 1 / 4 wavelength of the center frequency of the first frequency band, and further, the electrical length of the first radiator 1 is close to 1 / 6 wavelength of the center frequency of the first frequency band. Optionally, the current I3 of the first resonant mode is distributed between the first free end C1 and the first ground terminal A1.

[0078] Optionally, the second frequency band includes but is not limited to at least one of the LB frequency band (less than or equal to 1 GHz), the MHB frequency band (greater than 1 GHz and less than or equal to 3 GHz), the UHB frequency band (greater than 3 GHz), the GPS frequency band, and the Wi-Fi frequency band. For example, the second frequency band is the MHB frequency band.

[0079] Optionally, the center frequency of the first frequency band is close to the center frequency of the second frequency band. For example, the difference between the center frequency of the first frequency band and the center frequency of the second frequency band is less than 300 MHz, but is not limited to this data, and can also be less than or equal to 400 MHz, 500 MHz, etc. For example, when the first frequency band is the MHB band, the second frequency band is the MHB band, or the GPS L1 band, or the Wi-Fi 2.4G band, etc. When the first frequency band is the LB band, the second frequency band is the LB band, or the GPS L5 band, etc. When the first frequency band is the UHB band, the second frequency band is the UHB band, or the Wi-Fi 5G band, etc.

[0080] Optionally, the electrical length of the first radiator 1 is close to or equal to 3 / 4 wavelength of the center frequency of the second frequency band. The second resonance mode is a 3 / 4 wavelength mode of the second frequency band.

[0081] The direction of at least part of the resonant current in the second resonant mode on the second radiator 3 is the same as the direction of at least part of the resonant current in the first resonant mode on the first radiator 1 .

[0082] See also Figure 5 and Figure 6 , since the second resonance mode is a 3 / 4 wavelength mode of the second frequency band, the resonance current of the second resonance mode includes a first sub-current I1 and a second sub-current I2 distributed between the second ground terminal A2 and the second free terminal C2 in reverse current direction. The direction of the first sub-current I1 or the second sub-current I2 is the same as the direction of at least part of the resonance current of the first resonance mode on the first radiator 1. The second resonance mode is used to improve the efficiency of the first frequency band.

[0083] When the electronic device 1000 is in a folded state, the second radiator 3 is a parasitic radiator of the first radiator 1. Since the second resonant mode is a 3 / 4 wavelength mode of the second frequency band, on the one hand, the length of the second radiator 3 is longer, that is, the overall size of the parasitic radiator of the first radiator 1 is longer, so as to improve the efficiency of the first frequency band supported by the first radiator 1; on the other hand, the second resonant mode forms the first sub-current I1 and the second sub-current I2 in opposite directions on the second radiator 3, and the partial resonant current on the second radiator 3 has the same direction as the partial resonant current on the first radiator 1 of the first resonant mode, and the unidirectional current on the first radiator 1 and the second radiator 3 improves the efficiency of the first resonant mode, thereby realizing that the 3 / 4 wavelength mode formed on the second radiator 3 improves the efficiency of the first frequency band, thereby improving the antenna performance of the electronic device 1000 when folded.

[0084] The electronic device 1000 provided in the present application is provided with the first radiator 1 and the second radiator 3 on the first side and the second side of the electronic device 1000, respectively. The first radiator 1 includes a first ground terminal A1, a first feeding point B1 and a first free end C1 which are arranged in sequence. The first signal source 2 is electrically connected to the first feeding point B1. The second radiator 3 includes a second ground terminal A2 and a second free end C2 which are arranged in sequence. When the electronic device 1000 is in a folded state, the first radiator 1 is coupled with the second radiator 3. The first signal source 2 excites the first radiator 1 to form a first resonance mode supporting a first frequency band and excites the second radiator 3 to form a second resonance mode supporting a second frequency band, so that the antenna component 30 forms a dual resonance to support more frequency bands. The second resonance mode is a 3 / 4 wavelength mode of the second frequency band, and the direction of at least part of the resonance current of the second resonance mode on the second radiator 3 is the same as the direction of at least part of the resonance current of the first resonance mode on the first radiator 1. The second resonance mode is used to improve the efficiency of the first frequency band and improve the antenna performance of the electronic device 1000 after folding.

[0085] Optional, see Figure 4 The electronic device 1000 further includes a first matching circuit M1, which is electrically connected between the first feeding point B1 and the first signal source 2. The first matching circuit M1 is used to achieve impedance matching between the first signal source 2 end and the radiator end, thereby exciting a resonant mode. The first matching circuit M1 includes but is not limited to capacitors, inductors, etc.

[0086] Specifically, the first matching circuit M1 includes but is not limited to a capacitor, or an inductor, a series device of a capacitor and an inductor, a parallel device of a capacitor and an inductor, the above-mentioned series device in parallel with a capacitor, the above-mentioned series device in parallel with an inductor, two of the above-mentioned series devices in parallel, two of the above-mentioned parallel devices in series, and so on.

[0087] In an alternative embodiment, see Figure 5 and Figure 7 , the center frequency of the second frequency band supported by the second resonance mode formed on the second radiator 3 is lower than the center frequency of the first frequency band supported by the first resonance mode formed on the first radiator 1.

[0088] Optionally, the difference between the center frequency of the first frequency band and the center frequency of the second frequency band is less than or equal to the preset frequency difference, so that the co-directional resonant current generated by the second resonant mode on the second radiator 3 and the co-directional resonant current of the first resonant mode on the first radiator 1 can be integrated to achieve a positive superposition effect, thereby improving the efficiency of the first resonant mode. For example, the preset frequency difference is 1 GHz. For further example, the preset frequency difference is 0.5 GHz or 0.4 GHz.

[0089] For example, the center frequency of the first frequency band is 1.8 GHz, and the first frequency band covers the B3 frequency band. The center frequency of the second frequency band is 1.5 GHz, and the second frequency band covers the B11 frequency band or the B21 frequency band.

[0090] In this embodiment, the center frequency of the second frequency band supported by the second resonant mode formed on the second radiator 3 is designed to be smaller than the center frequency of the first frequency band supported by the first resonant mode formed on the first radiator 1, so that the antenna assembly 30 can cover the first frequency band and the second frequency band at the same time. Since the second resonant mode is a 3 / 4 wavelength mode, the resonant current of the second resonant mode includes two reverse currents. When the electronic device 1000 is in a folded state, the first radiator 1 and the second radiator 3 are arranged in parallel, so a resonant current in the same direction as the resonant current on the first radiator 1 is formed on the second radiator 3. The effects of the same-direction resonant currents on the first radiator 1 and the second radiator 3 are integrated to produce a positive superposition effect, so as to improve the efficiency of the first resonant mode.

[0091] See also Figure 5, the current of the second resonant mode on the second radiator 3 includes the first sub-current I1 and the second sub-current I2 distributed between the second ground terminal A2 and the second free terminal C2. The current direction of the first sub-current I1 is the same as the direction of the resonant current of the first resonant mode on the first radiator 1. The mode of the first sub-current I1 is a 1 / 2 wavelength mode. For example, the resonant current on the first radiator 1 flows from the first ground terminal A1 to the first free terminal C1. The first sub-current I1 flows from the second ground terminal A2 to the first reverse point O1 on the second radiator 3. The distance between the first reverse point O1 and the second ground terminal A2 is approximately 2 / 3 of the total length of the second radiator 3.

[0092] See also Figure 5 , the direction of the second sub-current I2 is opposite to the direction of the resonant current of the first resonant mode on the first radiator 1. The mode of the second sub-current I2 is a 1 / 4 wavelength mode. For example, the resonant current on the first radiator 1 flows from the first ground terminal A1 to the first free terminal C1. The second sub-current I2 flows from the second free terminal C2 to the first reverse point O1.

[0093] See also Figure 7 , Figure 7 It is the S parameter curve of the first antenna assembly 30 provided in the embodiment of the present application. Among them, curve a is the S parameter curve when the first radiator 1 is not coupled with the second radiator 3. Curve b is the S parameter curve when the first radiator 1 is coupled with the second radiator 3. From curve b, it can be seen that after the second radiator 3 is coupled with the first radiator 1, a double-wave resonance is formed. Among them, the center frequency of the second frequency band supported by the second radiator 3 under the coupling of the first radiator 1 is about 1.5 GHz, and the center frequency of the first frequency band supported by the first radiator 1 is about 1.8 GHz, and the center frequency of the second frequency band is less than the center frequency of the first frequency band.

[0094] See also Figure 8 , Figure 8 : is the efficiency curve of the first antenna assembly 30 provided in the embodiment of the present application. Curve a1 is the radiation efficiency curve when the first radiator 1 is not coupled with the second radiator 3. Curve b1 is the radiation efficiency curve when the first radiator 1 is coupled with the second radiator 3. Curve a2 is the system efficiency curve when the first radiator 1 is not coupled with the second radiator 3. Curve b2 is the system efficiency curve when the first radiator 1 is coupled with the second radiator 3.

[0095] From the comparison of curve a2 and curve b2, it can be seen that the efficiency of the center frequency of the first frequency band after the second radiator 3 is coupled with the first radiator 1 is higher than the efficiency of the center frequency of the first frequency band when the first radiator 1 is not coupled with the second radiator 3. This shows that after the first radiator 1 is coupled with the second radiator 3, the efficiency of the first frequency band is improved, and at the center frequency of the first frequency band, the system efficiency is improved by 1dB.

[0096] In another alternative embodiment, see Figure 6 and Fig. 9 , the center frequency of the second frequency band supported by the second resonance mode formed on the second radiator 3 is greater than the center frequency of the first frequency band supported by the first resonance mode formed on the first radiator 1.

[0097] Optionally, the difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than or equal to the preset frequency difference, so that the co-directional resonant current generated by the second resonant mode on the second radiator 3 and the co-directional resonant current of the first resonant mode on the first radiator 1 can be integrated to achieve a positive superposition effect, thereby improving the efficiency of the first resonant mode. For example, the preset frequency difference is 1 GHz. For further example, the preset frequency difference is 0.5 GHz or 0.4 GHz.

[0098] For example, the center frequency of the first frequency band is close to 1.8 GHz, and the first frequency band covers the B3 frequency band. The center frequency of the second frequency band is close to 2 GHz, and the second frequency band covers the B1 frequency band or the B34 frequency band.

[0099] Compared with the implementation method in which the center frequency of the second frequency band is smaller than the center frequency of the first frequency band, in this implementation method, since the center frequency of the second frequency band is relatively high, the length of the second radiator 3 is smaller and the overall size of the antenna assembly 30 is smaller.

[0100] See also Figure 6 , the current of the second resonant mode on the second radiator 3 includes the first sub-current I1 and the second sub-current I2 distributed between the second ground terminal A2 and the second free end C2. The current direction of the second sub-current I2 is the same as the direction of the resonant current of the first resonant mode on the first radiator 1. The mode of the second sub-current I2 is a 1 / 2 wavelength mode. For example, the resonant current on the second radiator 3 flows from the first ground terminal A1 to the first free end C1. The second sub-current I2 flows from the second reverse point O2 to the second free end C2. The distance between the second reverse point O2 and the second free end C2 is approximately 2 / 3 of the total length of the second radiator 3.

[0101] See also Figure 6, the direction of the first sub-current I1 is opposite to the direction of the resonant current of the first resonant mode on the first radiator 1, and the mode of the first sub-current I1 is a 1 / 4 wavelength mode. For example, the resonant current on the first radiator 1 flows from the first ground terminal A1 to the first free terminal C1. The first sub-current I1 flows from the second reverse point O2 to the second ground terminal A2.

[0102] See also Fig. 9 , Fig. 9 It is the S parameter curve of the second antenna assembly 30 provided in the embodiment of the present application. Among them, curve a is the S parameter curve when the first radiator 1 is not coupled with the second radiator 3. Curve b is the S parameter curve when the first radiator 1 is coupled with the second radiator 3. From curve b, it can be seen that after the second radiator 3 is coupled with the first radiator 1, a double-wave resonance is formed. Among them, the center frequency of the second frequency band supported by the second radiator 3 under the coupling of the first radiator 1 is about 2GHz, and the center frequency of the first frequency band supported by the first radiator 1 is about 1.8GHz, and the center frequency of the second frequency band is greater than the center frequency of the first frequency band.

[0103] See also Fig.10 , Fig.10 : is the efficiency curve of the second antenna assembly 30 provided in the embodiment of the present application. Curve a1 is the radiation efficiency curve when the first radiator 1 is not coupled with the second radiator 3. Curve b1 is the radiation efficiency curve when the first radiator 1 is coupled with the second radiator 3. Curve a2 is the system efficiency curve when the first radiator 1 is not coupled with the second radiator 3. Curve b2 is the system efficiency curve when the first radiator 1 is coupled with the second radiator 3.

[0104] From the comparison of curve a2 and curve b2, it can be seen that the efficiency of the center frequency of the first frequency band after the second radiator 3 is coupled with the first radiator 1 is higher than the efficiency of the center frequency of the first frequency band when the first radiator 1 is not coupled with the second radiator 3. This shows that after the first radiator 1 is coupled with the second radiator 3, the efficiency of the first frequency band is improved, and at the center frequency of the first frequency band, the system efficiency is improved by more than 0.5dB.

[0105] The above two embodiments illustrate that the resonant frequency generated by the second radiator 3 under the excitation of the first signal source 2 is higher or lower than the resonant frequency generated by the first radiator 1 under the excitation of the first signal source 2, and both can improve the efficiency of the first frequency band, so that the length of the second radiator 3 can be flexibly designed. For example, the length of the second radiator 3 is designed to be relatively long, that is, it can be used as a low-frequency radiator, and the resonant frequency generated by the second radiator 3 under the excitation of the first signal source 2 is lower than the resonant frequency generated by the first radiator 1 under the excitation of the first signal source 2, and the efficiency of the first frequency band is improved; for another example, the length of the second radiator 3 is designed to be relatively short, and the second radiator 3 and the first radiator 1 are both used as MHB radiators to achieve MHB broadband; the second radiator 3 can also generate a resonant frequency under the excitation of the first signal source 2 that is higher than the resonant frequency generated by the first radiator 1 under the excitation of the first signal source 2, and the efficiency of the first frequency band is improved.

[0106] See also Fig.11 , the second radiator 3 also includes a first connection point J1 located between the second ground terminal A2 and the second free end C2. The antenna assembly 30 also includes a first switch tuning circuit T1. One end of the first switch tuning circuit T1 is electrically connected to the first connection point J1, and the first switch tuning circuit T1 is grounded. The first switch tuning circuit T1 is used to switch the second radiator 3 to work in the first working state or in the second working state. Among them, the first working state is that the center frequency of the second frequency band is less than the center frequency of the first frequency band. The second working state is that the center frequency of the second frequency band is greater than the center frequency of the first frequency band.

[0107] See also Fig.11 The first switch tuning circuit T1 includes a first sub-switch T11 and at least one matching element T12. The matching element T12 includes an inductor or a capacitor.

[0108] When the first sub-switch T11 is a single-pole single-throw switch, the number of the matching element T12 is one. One end of the first sub-switch T11 is electrically connected to the first connection point J1, the other end of the first sub-switch T11 is electrically connected to one end of the matching element T12, and the other end of the matching element T12 is grounded.

[0109] When the first sub-switch T11 controls the matching element T12 to be disconnected or connected with the first connection point J1, the current distribution on the second radiator 3 is different. The matching element T12 is connected to the second radiator 3, which is equivalent to increasing (or decreasing) the electrical length of the second radiator 3, thereby tuning the resonant frequency of the second radiator 3, thereby making the center frequency of the second frequency band smaller than (or larger than) the center frequency of the first frequency band. In this way, the antenna assembly 30 can support multiple frequency bands through the first switch tuning circuit T1, and flexibly tune the size of the second frequency band covered by the second radiator 3.

[0110] When the first sub-switch T11 is a multi-pole multi-throw switch, the number of matching elements T12 is multiple. The impedance of each matching element T12 is different. For example, the multiple matching elements T12 include a large inductor, a small capacitor, etc. One end of the first sub-switch T11 is electrically connected to the first connection point J1, one end of each matching element T12 is electrically connected to the first sub-switch T11, and the other end of each matching element T12 is grounded. Each matching element T12 can be connected or disconnected with the first connection point J1 independently of each other.

[0111] When the first sub-switch T11 controls the first connection point J1 to switch between the grounded large inductance or the grounded small capacitance, the current distribution on the second radiator 3 is different, which is equivalent to increasing (or decreasing) the electrical length of the second radiator 3, thereby tuning the resonant frequency of the second radiator 3, and making the center frequency of the second frequency band smaller than (or larger than) the center frequency of the first frequency band. In this way, the antenna assembly 30 can support multiple frequency bands through the first switch tuning circuit T1, and flexibly tune the size of the second frequency band covered by the second radiator 3.

[0112] For example, see Fig.12 , the first switch tuning circuit T1 includes a first sub-switch T11 and a capacitor element C0. That is, the matching element T12 includes the capacitor element C0. One end of the first sub-switch T11 is electrically connected to the first connection point J1, the other end of the first sub-switch T11 is electrically connected to the capacitor element C0, and the other end of the capacitor element C0 is grounded. Since the parallel grounded capacitor can make the second frequency band supported by the second radiator 3 shift toward low frequency, when the first sub-switch T11 conducts the first connection point J1 and the capacitor element C0, the second radiator 3 works in the first working state. The center frequency of the second frequency band is lower than the center frequency of the first frequency band.

[0113] For another example, see Fig.13, the first switch tuning circuit T1 includes a second sub-switch T13 and an inductor L0. That is, the matching element T12 includes the inductor L0. One end of the second sub-switch T13 is electrically connected to the first connection point J1, the other end of the second sub-switch T13 is electrically connected to the inductor L0, and the other end of the inductor L0 is grounded. Since the parallel grounding inductance is equivalent to shortening the electrical length of the second radiator 3, the second frequency band supported by the second radiator 3 is shifted toward high frequency. When the second sub-switch T13 conducts the first connection point J1 and the inductor L0, the second radiator 3 works in the second working state. The center frequency of the second frequency band is greater than the center frequency of the first frequency band.

[0114] The first sub-switch T11 and the second sub-switch T13 may be the same switch. The first sub-switch T11 and the second sub-switch T13 include but are not limited to switch tubes, specifically but are not limited to transistors, triodes, CMOS tubes, etc.

[0115] Of course, in other embodiments, the matching element T12 further includes a capacitor element C0 and an inductor element L0.

[0116] Optional, see Fig.14 The second radiator 3 further includes a second feeding point B2. The second feeding point B2 is located between the second ground end A2 and the second free end C2.

[0117] See also Fig.14 The antenna assembly 30 also includes a switch unit 5 and a second signal source 4.

[0118] One end of the switch unit 5 is electrically connected to the second feeding point B2, and the switch unit 5 is also electrically connected to the second signal source 4. When the switch unit 5 controls the second signal source 4 to be turned on with the second feeding point B2, the second signal source 4 is used to excite the second radiator 3 to form a third resonance mode supporting a third frequency band. The third resonance mode includes a 1 / 4 wavelength mode or a CRLH mode of the third frequency band. When the switch unit 5 controls the second signal source 4 to be disconnected from the second feeding point B2, the second radiator 3 forms the second resonance mode when folded.

[0119] Optional, see Fig.14 The electronic device 1000 further includes a second matching circuit M2, which is electrically connected between the second feeding point B2 and the second signal source 4. The second matching circuit M2 is used to achieve impedance matching between the second signal source 4 end and the radiator end, thereby exciting a resonant mode. The second matching circuit M2 includes but is not limited to a capacitor, an inductor, etc. The switch unit 5 is electrically connected between the second matching circuit M2 and the second feeding point B2.

[0120] Specifically, the second matching circuit M2 includes but is not limited to a capacitor, or an inductor, a series device of a capacitor and an inductor, a parallel device of a capacitor and an inductor, the above-mentioned series device in parallel with a capacitor, the above-mentioned series device in parallel with an inductor, two of the above-mentioned series devices in parallel, two of the above-mentioned parallel devices in series, and so on.

[0121] When the electronic device 1000 is in the unfolded state, the switch unit 5 is in the on state, that is, the second radiator 3 operates in the third frequency band.

[0122] In other words, the second radiator 3 can not only serve as a parasitic radiator of the first radiator 1 to support the second frequency band when the switch unit 5 is switched to disconnect from the second signal source 4; it can also serve as a main radiator supporting the third frequency band when the switch unit 5 is switched to connect with the second signal source 4, so as to realize the multiple functions of the second radiator 3. In particular, when the electronic device 1000 is in the unfolded state, if the second radiator 3 is not connected to the second signal source 4, the second radiator 3 does not function as an antenna, resulting in a waste of space. In the embodiment of the present application, when the electronic device 1000 is in the unfolded state, the second radiator 3 is connected to the second signal source 4, so that the second radiator 3 can also support the third frequency band when the electronic device 1000 is in the unfolded state, which reasonably utilizes the limited space on the electronic device 1000, increases the function of the second radiator 3, and also increases the frequency band supported by the antenna assembly 30 when the electronic device 1000 is in the unfolded state.

[0123] Optionally, the third frequency band includes but is not limited to at least one of the LB band (less than or equal to 1 GHz), the MHB band (greater than 1 GHz and less than or equal to 3 GHz), the UHB band (greater than 3 GHz), the GPS band, and the Wi-Fi band.

[0124] Further, the third resonance mode is a 1 / 4 wavelength mode of the third frequency band or a CRLH mode of the third frequency band. Then. The center frequency of the third frequency band is much smaller than the center frequency of the second frequency band. Further, the center frequency of the third frequency band is smaller than the center frequency of the first frequency band. In this way, the third frequency band can be an LB frequency band.

[0125] Optionally, the resonant current of the third resonant mode flows from the second ground terminal A2 to the second free terminal C2, or flows from the second free terminal C2 to the second ground terminal A2.

[0126] In the unfolded state, the second radiator 3 operates in the LB frequency band. At this time, the first radiator 1 operates in the MHB frequency band. The antenna assembly 30 operates in the MHB frequency band + LB frequency band.

[0127] When the electronic device 1000 is in a folded state, the switch unit 5 can be in an off state or an on state. The second radiator 3 can work in the second frequency band or in the third frequency band according to actual needs. Among them, the second frequency band is the MHB frequency band. That is, the antenna assembly 30 can work in the MHB frequency band + LB frequency band or the MHB frequency band + MHB frequency band according to actual needs (the efficiency of the first frequency band is improved).

[0128] Since there is a large difference between the MHB frequency band in which the first radiator 1 operates and the LB frequency band in which the second radiator 3 operates, when the electronic device 1000 is in a folded state, the first radiator 1 can operate in the MHB frequency band under the excitation of the first signal source 2, and the second radiator 3 can operate in the LB frequency band under the excitation of the second signal source 4, with basically no influence on each other.

[0129] See also Fig.14 , the antenna assembly 30 further includes a plurality of matching branches M0. Each of the matching branches M0 is electrically connected to the switch unit 5. The switch unit 5 can selectively electrically connect at least one of the plurality of matching branches M0 to switch the size of the sub-band of the third frequency band or the size of the sub-band of the second frequency band. The matching branch M0 includes but is not limited to a ground inductor, a ground capacitor, etc.

[0130] Optionally, the switch unit 5 is a multi-pole multi-throw switch. The switch unit 5 has multiple output terminals, one of which is electrically connected to the second signal source 4, and each of the other output terminals is electrically connected to a matching branch M0. The switch unit 5 can independently control each matching branch M0 to be connected to the connection point to tune the electrical length of the second radiator 3, and then switch the sub-band of the second frequency band when the second radiator 3 acts as a parasitic radiator of the first radiator 1, for example, switch the sub-band size of the MHB frequency band; or switch the sub-band of the third frequency band when the second radiator 3 acts as a main radiator, for example, switch the sub-band size of the LB frequency band.

[0131] In this embodiment, the switch unit 5 may be a common switch, one of which may be used to control the conduction and disconnection between the second signal source 4 and the connection point; one or more of which may be used to tune the size of the operating frequency band of the parasitic radiator as the first radiator 1; one or more of which may be used to tune the size of the operating frequency band of the main radiator. For example, when the switch unit 5 is a 4SPST switch, one of which may be used to control the conduction and disconnection between the second signal source 4 and the connection point; one of which may be used to tune the size of the operating frequency band of the parasitic radiator as the first radiator 1; two of which may be used to tune the size of the operating frequency band of the main radiator. Alternatively, one of which may be used to control the conduction and disconnection between the second signal source 4 and the connection point; three of which may be used to tune the size of the operating frequency band of the parasitic radiator as the first radiator 1.

[0132] In the embodiment where the antenna assembly 30 includes the first switch tuning circuit T1, the first sub-switch T11 and the second sub-switch T13 can be two paths in the switch unit 5. The capacitor element C0 and the second inductor element L0 are both matching branches M0.

[0133] The relative positions of the second radiator 3 and the first radiator 1 are described below with reference to the accompanying drawings.

[0134] Optionally, when the electronic device 1000 is in a folded state, an extension direction of the first radiator 1 is arranged parallel to an extension direction of the second radiator 3. The first radiator 1 and the second radiator 3 are directly opposite in a thickness direction of the electronic device 1000. The first free end C1 and the second free end C2 are aligned in the thickness direction of the electronic device 1000.

[0135] In this embodiment, by designing the first radiator 1 and the second radiator 3 to be parallel and facing each other in the folded state, the facing area between the first radiator 1 and the second radiator 3 is larger during coupling, thereby increasing the coupling effect between the first radiator 1 and the second radiator 3. Furthermore, there is an insulating break next to the first free end C1, and there is an insulating break next to the second free end C2, and the two insulating breaks face each other in the thickness direction, so as to improve the appearance consistency of the electronic device 1000.

[0136] Of course, in other embodiments, the first free end C1 and the second free end C2 may not be aligned. For example, the orthographic projection of the first free end C1 on the second radiator 3 is located between the second free end C2 and the second grounding end A2. For another example, the orthographic projection of the second free end C2 on the first radiator 1 is located between the first free end C1 and the first grounding end A1. For another example, the first grounding end A1 and the second grounding end A2 may be aligned.

[0137] For optional reference, see Fig.15 When the electronic device 1000 is in a folded state, the first radiator 1 and the second radiator 3 extend in the same direction. In the extending direction of the first radiator 1, the first free end C1 and the second free end C2 are respectively located on opposite sides of the insulating gap. The second grounding end A2 is located on the side of the second free end C2 away from the first free end C1.

[0138] In this embodiment, a 3 / 4 wavelength mode is formed on the second radiator 3, wherein the resonant current distribution on the second radiator 3 can be referred to Figure 6 At least part of the resonant current on the second radiator 3 has the same direction as the resonant current on the first radiator 1, and the same-direction current on the second radiator 3 is conducive to improving the first resonant mode, thereby improving the antenna performance of the electronic device 1000 when folded.

[0139] In this embodiment, the first radiator 1 and the second radiator 3 are not directly opposite to each other in the thickness direction, but because the first free end C1 and the second free end C2 are close to each other when folded, a coupling electric field is formed between the first free end C1 and the second free end C2, so that the radio frequency current on the first radiator 1 is transmitted to the second radiator 3, thereby stimulating the second radiator 3 to form a second resonance mode supporting the second frequency band.

[0140] See also Fig.16 The antenna assembly 30 further includes a third radiator 6. At least a portion of the third radiator 6 and at least a portion of the second radiator 3 are located on the same side of the second body 20.

[0141] See also Fig.16 The third radiator 6 includes a third grounding end A3 and a third free end C3. The third grounding end A3 is grounded, and the third free end C3 is an end portion of the frame where an insulating gap is provided.

[0142] A coupling gap is formed between the third free end C3 and the second free end C2. The third radiator 6 is used to work in a third working state or a fourth working state. The third working state is that the third radiator 6 forms a fourth resonance mode supporting a fourth frequency band under the excitation of the first signal source 2, that is, the third radiator 6 acts as a parasitic branch of the first radiator 1. The center frequency of the fourth frequency band is greater than the center frequency of the first frequency band.

[0143] Optionally, the fourth frequency band includes but is not limited to at least one of the MHB frequency band (greater than 1 GHz and less than or equal to 3 GHz), the UHB frequency band (greater than 3 GHz), the GPS frequency band, and the Wi-Fi frequency band.

[0144] Optionally, the fourth resonance mode includes but is not limited to a 1 / 4 wavelength mode.

[0145] Optional, see Fig.16 When the electronic device 1000 is in a folded state, the first radiator 1 and the second radiator 3 are parallel and opposite to each other, the second free end C2 of the second radiator 3 is flush with the first free end C1 of the first radiator 1, the third free end C3 of the third radiator 6 is coupled with the second free end C2 of the second radiator 3, and at the same time, the third free end C3 of the third radiator 6 is coupled with the first free end C1 of the first radiator 1.

[0146] When the second signal source 4 is disconnected from the second feeding point B2, the second radiator 3 and the third radiator 6 can both serve as parasitic radiators of the first radiator 1. Fig.17 , under the excitation of the first signal source 2, a resonant current of a 1 / 4 wavelength mode distributed between the first ground terminal A1 and the first free terminal C1 is formed on the first radiator 1 to support the first frequency band. At this time, a current in the same direction as that on the first radiator 1 is formed on the third radiator 6; see Fig.18 , a resonant current of a 3 / 4 wavelength mode distributed between the second ground end A2 and the second free end C2 is formed on the second radiator 3 to support the second frequency band; see Fig.19 A resonant current of a 1 / 4 wavelength mode distributed between the third ground end A3 and the third free end C3 is formed on the third radiator 6 to support the fourth frequency band. At this time, a reverse current to that on the first radiator 1 is formed on the third radiator 6 .

[0147] The electrical length of the third radiator 6 is slightly smaller than the electrical length of the first radiator 1. The first resonance mode is integrated with the fourth resonance mode. The fourth resonance mode can improve the efficiency of the first resonance mode to increase the in-band efficiency and in-band bandwidth of the first frequency band.

[0148] Among them, the size relationship between the first frequency band, the second frequency band, and the fourth frequency band is: the center frequency of the second frequency band < the center frequency of the first frequency band < the center frequency of the fourth frequency band; or, the center frequency of the first frequency band < the center frequency of the second frequency band < the center frequency of the fourth frequency band.

[0149] The antenna assembly 30 further includes a second signal source 4. The second signal source 4 is electrically connected to a second feeding point B2 on the second radiator 3. The second signal source 4 is used to excite the second radiator 3 to form a third resonance mode supporting a third frequency band.

[0150] When the second signal source 4 is connected to the second feeding point B2, no matter the electronic device 1000 is in a folded state or an unfolded state, the third radiator 6 works in a fourth working state. The fourth working state is that the third radiator 6 forms a fifth resonance mode supporting a fifth frequency band under the excitation of the second signal source 4, that is, the third radiator 6 acts as a parasitic branch of the second radiator 3. The center frequency of the fifth frequency band is greater than the center frequency of the third frequency band.

[0151] Optionally, the fifth frequency band includes but is not limited to at least one of the MHB frequency band (greater than 1 GHz and less than or equal to 3 GHz), the UHB frequency band (greater than 3 GHz), the GPS frequency band, and the Wi-Fi frequency band.

[0152] Optionally, the fifth resonance mode includes but is not limited to a 1 / 4 wavelength mode.

[0153] In this implementation, please refer to Fig. 20 , under the excitation of the first signal source 2, a resonant current of a 1 / 4 wavelength mode distributed between the first ground terminal A1 and the first free terminal C1 is formed on the first radiator 1 to support the first frequency band. Under the excitation of the second signal source 4, a resonant current of a 1 / 4 wavelength mode distributed between the second ground terminal A2 and the second free terminal C2 is formed on the second radiator 3 to support the third frequency band. At this time, the current on the third radiator 6 is in the same direction as the current on the second radiator 3. Please refer to Fig.21 Under the excitation of the second signal source 4, the third radiator 6 forms a resonant current in a 1 / 4 wavelength mode distributed between the third ground terminal A3 and the third free end C3 to support the fifth frequency band. At this time, the current on the third radiator 6 is opposite to the current on the second radiator 3.

[0154] The electrical length of the third radiator 6 is slightly smaller than the electrical length of the second radiator 3. The third resonance mode is integrated with the fifth resonance mode. The fifth resonance mode can improve the efficiency of the third resonance mode to increase the in-band efficiency and in-band bandwidth of the third frequency band.

[0155] Among them, the size relationship between the first frequency band, the third frequency band, and the fifth frequency band is: the center frequency of the first frequency band < the center frequency of the third frequency band < the center frequency of the fifth frequency band; or, the center frequency of the third frequency band < the center frequency of the first frequency band < the center frequency of the fifth frequency band; or, the center frequency of the third frequency band < the center frequency of the fifth frequency band < the center frequency of the first frequency band.

[0156] The above antenna assembly 30 can form three resonant modes, increasing the frequency band supported by the antenna assembly 30, wherein, in the folded state, the second radiator 3 and the third radiator 6 both act as parasitic radiators of the first radiator 1, and both can improve the working efficiency of the first radiator 1 in the folded state. Further, when the third radiator 6 acts as a parasitic radiator of the second radiator 3, the third radiator 6 can improve the working efficiency of the second radiator 3.

[0157] Of course, in other implementations, see Fig. 22 , the first radiator 1 and the third radiator 6 are parallel and facing each other when the electronic device 1000 is in the folded state, the third free end C3 of the third radiator 6 is flush with the first free end C1 of the first radiator 1, the second free end C2 of the second radiator 3 is coupled with the third free end C3 of the third radiator 6, and at the same time, the second free end C2 of the second radiator 3 is coupled with the first free end C1 of the first radiator 1, which can also form three resonance modes, increasing the frequency band supported by the antenna assembly 30, wherein, in the folded state, the second radiator 3 and the third radiator 6 both act as parasitic radiators of the first radiator 1, and both can improve the working efficiency of the first radiator 1 in the folded state. Further, when the third radiator 6 acts as a parasitic radiator of the second radiator 3, the third radiator 6 can improve the working efficiency of the second radiator 3.

[0158] See also Fig.23 The third radiator 6 includes a second connection point J2. The second connection point J2 is located between the third ground terminal A3 and the third free terminal C3.

[0159] See also Fig.23 The antenna assembly 30 further includes a second switch tuning circuit T2. One end of the second switch tuning circuit T2 is electrically connected to the second connection point J2, and the other end of the second switch tuning circuit T2 is grounded. The second switch tuning circuit T2 is used to tune the third radiator 6 to work in the third working state or the fourth working state. In other words, the third radiator 6 is switched as a parasitic branch of the second radiator 3 or the first radiator 1 through the second switch tuning circuit T2.

[0160] When the third radiator 6 is used as a parasitic radiator of the first radiator 1, the electrical length of the third radiator 6 may be slightly smaller than the electrical length of the first radiator 1. When the third radiator 6 is used as a parasitic radiator of the second radiator 3, the electrical length of the third radiator 6 is slightly smaller than the electrical length of the second radiator 3. Since the electrical length of the second radiator 3 is much larger than the electrical length of the first radiator 1, the electrical length of the third radiator 6 when it is used as a parasitic radiator of the first radiator 1 is different from the electrical length of the third radiator 6 when it is used as a parasitic radiator of the second radiator 3. The electrical length of the third radiator 6 is tuned by the second switch tuning circuit T2 so that the electrical length of the third radiator 6 is slightly smaller than the electrical length of the second radiator 3, thereby realizing the third radiator 6 as a parasitic radiator of the second radiator 3 to improve the working efficiency of the third frequency band; or, the electrical length of the third radiator 6 is tuned by the second switch tuning circuit T2 so that the electrical length of the third radiator 6 is slightly smaller than the electrical length of the first radiator 1, thereby realizing the third radiator 6 as a parasitic radiator of the first radiator 1 to improve the working efficiency of the first frequency band.

[0161] Optional, see Fig.23 The second switch tuning circuit T2 includes a third sub-switch T21 and a plurality of first tuning branches T22. One end of the third sub-switch T21 is electrically connected to the second connection point J2, one end of each first tuning branch T22 is electrically connected to one end of the third sub-switch T21, and the other end of each first tuning branch T22 is grounded.

[0162] Optionally, the first tuning branch T22 is an inductor or a capacitor. The impedance of each first tuning branch T22 is different, and then when different first tuning branches T22 are electrically connected to the second connection point J2, the electrical length of the third radiator 6 can be tuned. For example, the third sub-switch T21 is switched to capacitor grounding, which is equivalent to increasing the electrical length of the third radiator 6, and then switching the third radiator 6 to a parasitic branch of the second radiator 3; for another example, the third sub-switch T21 is switched to inductor grounding, which is equivalent to reducing the electrical length of the third radiator 6, and then switching the third radiator 6 to a parasitic branch of the first radiator 1.

[0163] See also Fig.24 , the antenna assembly 30 also includes a fourth radiator 7.

[0164] At least a portion of the fourth radiator 7 and at least a portion of the first radiator 1 are located on the same side of the first body 10 .

[0165] See also Fig.24The fourth radiator 7 includes a fourth ground terminal A4 and a fourth free terminal C4. The fourth ground terminal A4 is grounded. A coupling gap is formed between the fourth free terminal C4 and the first free terminal C1. The fourth radiator 7 is used to form a sixth resonant mode supporting a sixth frequency band under the excitation of the first signal source 2. The center frequency of the sixth frequency band is greater than the center frequency of the first frequency band.

[0166] Optionally, the sixth frequency band includes but is not limited to at least one of the MHB frequency band (greater than 1 GHz and less than or equal to 3 GHz), the UHB frequency band (greater than 3 GHz), the GPS frequency band, and the Wi-Fi frequency band.

[0167] Optionally, the sixth resonance mode includes but is not limited to a 1 / 4 wavelength mode.

[0168] No matter the electronic device 1000 is in a folded state or an unfolded state, the fourth radiator 7 serves as a parasitic radiator of the first radiator 1 .

[0169] See also Fig.25 Under the excitation of the first signal source 2, a resonant current in a 1 / 4 wavelength mode distributed between the first ground end A1 and the first free end C1 is formed on the first radiator 1 to support the first frequency band. At this time, a current in the same direction as that on the first radiator 1 is formed on the fourth radiator 7.

[0170] See also Fig.26 Under the excitation of the first signal source 2, the fourth radiator 7 forms a resonant current in a 1 / 4 wavelength mode distributed between the fourth ground terminal A4 and the fourth free end C4 to support the sixth frequency band. At this time, a reverse current is formed on the fourth radiator 7 to that on the first radiator 1.

[0171] The electrical length of the fourth radiator 7 is slightly smaller than the electrical length of the first radiator 1. The first resonance mode is integrated with the sixth resonance mode. The sixth resonance mode can improve the efficiency of the first resonance mode to increase the in-band efficiency and in-band bandwidth of the first frequency band.

[0172] See also Fig. 27 The fourth radiator 7 further includes a third connection point J3. The third connection point J3 is located between the fourth ground terminal A4 and the fourth free terminal C4.

[0173] See also Fig. 27 The antenna assembly 30 further includes a third switch tuning circuit T3. One end of the third switch tuning circuit T3 is electrically connected to the third connection point J3, and the other end of the third switch tuning circuit T3 is grounded. The third switch tuning circuit T3 is used to switch the sub-band of the sixth frequency band.

[0174] The electrical length of the fourth radiator 7 is tuned by the third switch tuning circuit T3, thereby switching the sub-band of the sixth frequency band.

[0175] Optional, see Fig. 27 The third switch tuning circuit T3 includes a fourth sub-switch T31, which is a single-pole single-throw switch. When the fourth sub-switch T31 ​​is turned on or off, the electrical length of the fourth radiator 7 changes.

[0176] Optional, see Fig. 27 The third switch tuning circuit T3 includes a fourth sub-switch T31 ​​and a plurality of second tuning branches T32. One end of the fourth sub-switch T31 ​​is electrically connected to the third connection point J3, one end of each second tuning branch T32 is electrically connected to one end of the fourth sub-switch T31, and the other end of each second tuning branch T32 is grounded.

[0177] Optionally, the second tuning branch T32 is an inductor or a capacitor. The impedance of each second tuning branch T32 is different, and thus when different second tuning branches T32 are electrically connected to the third connection point J3, the electrical length of the fourth radiator 7 can be tuned.

[0178] Optionally, the first radiator 1 and the second radiator 3 are parallel and opposite to each other when the electronic device 1000 is in the folded state, and the second free end C2 of the second radiator 3 is flush with the first free end C1 of the first radiator 1. The third radiator 6 and the fourth radiator 7 are parallel and opposite to each other when the electronic device 1000 is in the folded state, and the third free end C3 of the third radiator 6 is flush with the fourth free end C4 of the fourth radiator 7.

[0179] When the second signal source 4 is disconnected from the second feeding point B2 and the electronic device 1000 is in a folded state, the second radiator 3, the third radiator 6, and the fourth radiator 7 can all serve as parasitic radiators of the first radiator 1. Fig.25 , under the excitation of the first signal source 2, a resonant current of a 1 / 4 wavelength mode distributed between the first ground terminal A1 and the first free terminal C1 is formed on the first radiator 1 to support the first frequency band. At this time, a current in the same direction as that on the first radiator 1 is formed on the fourth radiator 7, and a current in the same direction as that on the first radiator 1 is formed on the third radiator 6. Fig.18 , a resonant current of a 3 / 4 wavelength mode distributed between the second ground end A2 and the second free end C2 is formed on the second radiator 3 to support the second frequency band; see Fig.19 , a resonant current of a 1 / 4 wavelength mode distributed between the third ground terminal A3 and the third free terminal C3 is formed on the third radiator 6 to support the fourth frequency band. At this time, a reverse current is formed on the third radiator 6 to that on the first radiator 1. Fig.26 , a resonant current distributed between the fourth ground end A4 and the fourth free end C4 is formed on the fourth radiator 7 to support the sixth frequency band; at this time, the current on the fourth radiator 7 is opposite to the current on the first radiator 1.

[0180] In the case where the second signal source 4 is connected to the second feeding point B2, no matter the electronic device 1000 is in a folded state or an unfolded state, refer to Fig.28 , under the excitation of the first signal source 2, a resonant current of a 1 / 4 wavelength mode distributed between the first ground terminal A1 and the first free terminal C1 is formed on the first radiator 1 to support the first frequency band, at this time, a current in the same direction as that on the first radiator 1 is formed on the fourth radiator 7. Under the excitation of the second signal source 4, a resonant current of a 1 / 4 wavelength mode distributed between the second ground terminal A2 and the second free terminal C2 is formed on the second radiator 3 to support the third frequency band, at this time, the current on the third radiator 6 is in the same direction as the current on the second radiator 3.

[0181] See also Fig.29 , the third radiator 6 forms a resonant current of a 1 / 4 wavelength mode distributed between the third ground terminal A3 and the third free end C3 under the excitation of the second signal source 4 to support the fifth frequency band, at which time the current on the third radiator 6 is opposite to the current on the second radiator 3. The fourth radiator 7 forms a resonant current of a 1 / 4 wavelength mode distributed between the fourth ground terminal A4 and the fourth free end C4 under the excitation of the first signal source 2 to support the sixth frequency band, at which time the direction of the resonant current on the fourth radiator 7 is the same as the direction of the resonant current on the first radiator 1.

[0182] Furthermore, the electronic device 1000 further includes a controller (not shown). The controller is electrically connected to the first sub-switch T11 , the second sub-switch T13 , the third sub-switch T21 , the fourth sub-switch T31 ​​and the switch unit 5 .

[0183] Optionally, the controller is used to control the first sub-switch T11 to control the resonant frequency of the second radiator 3 under the excitation of the first signal source 2 to be greater than or less than the resonant frequency of the first radiator 1 according to the required supported frequency band (B11 band, B21 band or B1 band, B34 band).

[0184] Optionally, the controller is used to control the switch unit 5 to switch the second radiator 3 to support the second frequency band or the third frequency band according to the required supported frequency band (LB frequency band or MHB frequency band).

[0185] Optionally, the controller is also used to control the switch unit 5 to switch the size of the sub-band of the MHB frequency band when the second radiator 3 operates in the second frequency band; or, the controller is also used to control the switch unit 5 to switch the size of the sub-band of the LB frequency band when the second radiator 3 operates in the third frequency band.

[0186] Optionally, the controller is also used to control the switching of the third sub-switch T21 so that the third radiator 6 serves as a parasitic branch of the second radiator 3 or the first radiator 1 according to the signal strength requirement of the first frequency band supported by the first radiator 1 or the signal strength requirement of the second frequency band supported by the second radiator 3.

[0187] Optionally, the controller is further configured to control the fourth sub-switch T31 ​​to switch a sub-band size of the sixth frequency band supported by the fourth radiator 7 according to a frequency band requirement.

[0188] Optional, see Fig.30 , a portion of the first radiator 1 is disposed on the first side 113, another portion of the first radiator 1 is disposed on the top side 111; the fourth radiator 7 is entirely disposed on the top side 111. A portion of the second radiator 3 is disposed on the third side 133, another portion of the second radiator 3 is disposed on the bottom side, and the third radiator 6 is entirely disposed on the top side 111.

[0189] See also Fig.31 , Fig.31 yes Fig.30 A partial schematic diagram of an electronic device 1000 when folded is provided, wherein the resonant frequency of the second radiator 3 is located before the resonant frequency of the first radiator 1. The portion of the dotted line frame is the same direction current formed on the first radiator 1 and the second radiator 3.

[0190] See also Fig.32 , Fig.32 yes Fig.30 A partial schematic diagram of another electronic device 1000 when folded is provided, wherein the resonant frequency of the second radiator 3 is located after the resonant frequency of the first radiator 1. The portion of the dotted line frame is the same direction current formed on the first radiator 1 and the second radiator 3.

[0191] The electronic device 1000 provided in the present application is provided with the first radiator 1 and the second radiator 3 on the first side and the second side of the electronic device 1000, respectively. The first radiator 1 includes a first ground terminal A1, a first feeding point B1 and a first free end C1 which are arranged in sequence. The first signal source 2 is electrically connected to the first feeding point B1. The second radiator 3 includes a second ground terminal A2 and a second free end C2 which are arranged in sequence. When the electronic device 1000 is in a folded state, the first radiator 1 is coupled with the second radiator 3. The first signal source 2 excites the first radiator 1 to form a first resonance mode supporting a first frequency band and excites the second radiator 3 to form a second resonance mode supporting a second frequency band, so that the antenna component 30 forms a dual resonance to support more frequency bands. The second resonance mode is a 3 / 4 wavelength mode of the second frequency band, and the direction of at least part of the resonance current of the second resonance mode on the second radiator 3 is the same as the direction of at least part of the resonance current of the first resonance mode on the first radiator 1. The second resonance mode is used to improve the efficiency of the first frequency band and improve the antenna performance of the electronic device 1000 after folding.

[0192] The resonant frequency generated by the second radiator 3 under the excitation of the first signal source 2 is higher or lower than the resonant frequency generated by the first radiator 1 under the excitation of the first signal source 2, and the efficiency of the first frequency band can be improved, so that the length of the second radiator 3 can be flexibly designed. For example, the length of the second radiator 3 is designed to be relatively long, that is, it can be used as a low-frequency radiator, and the resonant frequency generated by the second radiator 3 under the excitation of the first signal source 2 is lower than the resonant frequency generated by the first radiator 1 under the excitation of the first signal source 2, and the efficiency of the first frequency band is improved; for another example, the length of the second radiator 3 is designed to be relatively short, and the second radiator 3 and the first radiator 1 are both used as MHB radiators to achieve MHB broadband; the second radiator 3 can also generate a resonant frequency under the excitation of the first signal source 2 that is higher than the resonant frequency generated by the first radiator 1 under the excitation of the first signal source 2, and the efficiency of the first frequency band is improved.

[0193] The present application improves the performance of the first radiator 1 by time-division multiplexing the second radiator 3, which serves as the main antenna body or as a parasitic branch of the first radiator 1. When the second radiator 3 serves as a parasitic branch of the first radiator 1, the second radiator 3 operates in the 3 / 4 mode. When the second radiator 3 serves as the main antenna, the second radiator 3 operates in the 1 / 4 or CRLH mode. When the second radiator 3 serves as a parasitic branch of the first radiator 1, the resonant frequency of the second resonant mode can be before the resonant frequency of the first resonant mode or after the resonant frequency of the first resonant mode, which can significantly improve the antenna efficiency and make the mode tuning more flexible.

[0194] 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 electronic device comprises a first body, a second body and an antenna assembly, wherein the first body and the second body are movably connected so that the electronic device is in a folded state or an unfolded state, the first body comprises a first edge, the second body comprises a second edge, and when the first body and the second body are in a folded state, the first edge and the second edge are opposite to each other in a thickness direction of the electronic device; The antenna assembly comprises: A first radiator, at least partially disposed on the first side, the first radiator comprising a first grounding end, a first feeding point and a first free end disposed in sequence; a first signal source, the first signal source being electrically connected to the first feeding point, and the first signal source being used to feed an excitation current to the first radiator; A second radiator, at least partially disposed on the second side, the second radiator comprising a second grounding end and a second free end disposed in sequence; When the electronic device is in a folded state, the first radiator is coupled to the second radiator, the first signal source excites the first radiator to form a first resonance mode supporting a first frequency band and excites the second radiator to form a second resonance mode supporting a second frequency band, the second resonance mode is a 3 / 4 wavelength mode of the second frequency band, and the direction of at least part of the resonance current of the second resonance mode on the second radiator is the same as the direction of at least part of the resonance current of the first resonance mode on the first radiator, and the second resonance mode is used to improve the efficiency of the first frequency band.

2. The electronic device according to claim 1, wherein: The center frequency of the second frequency band is lower than the center frequency of the first frequency band.

3. The electronic device according to claim 2, characterized in that: The current of the second resonant mode on the second radiator includes a first sub-current and a second sub-current distributed between the second ground end and the second free end, the current direction of the first sub-current is the same as the direction of the resonant current of the first resonant mode on the first radiator, the mode of the first sub-current is a 1 / 2 wavelength mode, the direction of the second sub-current is opposite to the direction of the resonant current of the first resonant mode on the first radiator, and the mode of the second sub-current is a 1 / 4 wavelength mode.

4. The electronic device according to claim 1, wherein: The center frequency point of the second frequency band is greater than the center frequency point of the first frequency band.

5. The electronic device according to claim 4, characterized in that: The current of the second resonant mode on the second radiator includes a first sub-current and a second sub-current distributed between the second ground end and the second free end, the current direction of the second sub-current is the same as the direction of the resonant current of the first resonant mode on the first radiator, the mode of the second sub-current is a 1 / 2 wavelength mode, the direction of the first sub-current is opposite to the direction of the resonant current of the first resonant mode on the first radiator, and the mode of the first sub-current is a 1 / 4 wavelength mode.

6. The electronic device according to claim 1, wherein: The second radiator also includes a first connection point located between the second ground end and the second free end; the antenna assembly also includes a first switch tuning circuit, one end of the first switch tuning circuit is electrically connected to the first connection point, the first switch tuning circuit is grounded, and the first switch tuning circuit is used to switch the second radiator to work in a first working state or a second working state, wherein the first working state is that the center frequency of the second frequency band is less than the center frequency of the first frequency band; the second working state is that the center frequency of the second frequency band is greater than the center frequency of the first frequency band.

7. The electronic device according to claim 6, characterized in that: The first switch tuning circuit includes a first sub-switch and a capacitor element, one end of the first sub-switch is electrically connected to the first connection point, the other end of the first sub-switch is electrically connected to the capacitor element, and the other end of the capacitor element is grounded, and when the first sub-switch conducts the first connection point and the capacitor element, the second radiator operates in the first working state; And / or, the first switch tuning circuit includes a second sub-switch and an inductor element, one end of the second sub-switch is electrically connected to the first connection point, the other end of the second sub-switch is electrically connected to the inductor element, and the other end of the inductor element is grounded, and when the second sub-switch connects the first connection point and the inductor element, the second radiator operates in the second working state.

8. The electronic device according to claim 1, wherein: The second radiator further includes a second feeding point, and the second feeding point is located between the second ground end and the second free end; The antenna assembly also includes a switching unit and a second signal source, one end of the switching unit is electrically connected to the second feeding point, and the switching unit is also electrically connected to the second signal source. When the switching unit controls the second signal source to be connected to the second feeding point, the second signal source is used to excite the second radiator to form a third resonance mode supporting a third frequency band, and the third resonance mode includes a 1 / 4 wavelength mode or a CRLH mode of the third frequency band; when the switching unit controls the second signal source to be disconnected from the second feeding point, the second radiator forms the second resonance mode when folded.

9. The electronic device according to claim 8, characterized in that: The antenna assembly also includes multiple matching branches, each of which is electrically connected to the switch unit, and the switch unit is capable of selectively electrically connecting at least one of the multiple matching branches to switch the size of the sub-band of the third frequency band or switch the size of the sub-band of the second frequency band.

10. The electronic device according to claim 8, characterized in that: When the electronic device is in a folded state, the switch unit is in an off state or an on state; when the electronic device is in an unfolded state, the switch unit is in an on state.

11. The electronic device according to claim 8, characterized in that: The first frequency band is the MHB frequency band, the second frequency band is the MHB frequency band, and the third frequency band is the LB frequency band.

12. The electronic device according to claim 1, wherein: When the electronic device is in a folded state, the first radiator and the second radiator are arranged in parallel, and the first free end and the second free end are aligned in a thickness direction of the electronic device.

13. The electronic device according to claim 1, wherein: When the electronic device is in a folded state, the first radiator and the second radiator have the same extension direction; in the extension direction of the first radiator, the first free end and the second free end are respectively located on opposite sides of the insulating gap; the second grounding end is located on the side of the second free end away from the first free end.

14. The electronic device according to claim 12 or 13, characterized in that: The antenna assembly further includes a third radiator, at least a portion of the third radiator and at least a portion of the second radiator are located on the same side of the second body; the third radiator includes a third ground end and a third free end, a coupling gap is formed between the third free end and the second free end, and the third radiator is used to work in a third working state or a fourth working state, and the third working state is that the third radiator forms a fourth resonance mode supporting a fourth frequency band under the excitation of the first signal source, and the center frequency of the fourth frequency band is greater than the center frequency of the first frequency band; The antenna assembly further includes a second signal source, the second signal source is electrically connected to a second feeding point on the second radiator, and the second signal source is used to excite the second radiator to form a third resonant mode supporting a third frequency band; The fourth working state is that the third radiator forms a fifth resonance mode supporting a fifth frequency band under the excitation of the second signal source, and the center frequency of the fifth frequency band is greater than the center frequency of the third frequency band.

15. The electronic device according to claim 14, characterized in that: The third radiator comprises a second connection point, and the second connection point is located between the third ground end and the third free end; The antenna assembly also includes a second switch tuning circuit, one end of the second switch tuning circuit is electrically connected to the second connection point, the other end of the second switch tuning circuit is grounded, and the second switch tuning circuit is used to tune the third radiator to operate in the third working state or the fourth working state.

16. The electronic device according to any one of claims 1 to 13 and 15, characterized in that: The antenna assembly also includes a fourth radiator, at least a portion of which and at least a portion of the first radiator are located on the same side of the first body; the fourth radiator includes a fourth ground end and a fourth free end, a coupling gap is formed between the fourth free end and the first free end, and the fourth radiator is used to form a sixth resonant mode supporting a sixth frequency band under the excitation of the first signal source, and the center frequency of the sixth frequency band is greater than the center frequency of the first frequency band.

17. The electronic device according to claim 16, characterized in that: The fourth radiator further includes a third connection point, and the third connection point is located between the fourth ground end and the fourth free end; The antenna assembly also includes a third switch tuning circuit, one end of the third switch tuning circuit is electrically connected to the third connection point, the other end of the third switch tuning circuit is grounded, and the third switch tuning circuit is used to switch the sub-band of the sixth frequency band.

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