Electronic device

Abstract

The application discloses an electronic device, a first radiator includes a first end and a second end arranged oppositely, and a connection point and a feed point arranged between the first end and the second end; a signal source is electrically connected to the feed point; a second radiator includes a third end and a fourth end arranged oppositely, the third end is coupled to the second end through a gap, and the fourth end is grounded; one end of a first switch circuit is electrically connected to the connection point, and the other end of the first switch circuit is grounded; one end of a second switch circuit is electrically connected to the first end, and the other end of the second switch circuit is grounded; a working mode of an antenna assembly includes a first working mode and a second working mode, in the first working mode, the first switch circuit is in a conduction state, and the second switch circuit is in a disconnection state; in the second working mode, the first switch circuit is in a disconnection state, and the second switch circuit is in a conduction state. The application provides an electronic device with an antenna assembly maintaining good antenna performance.

Description

TECHNICAL FIELD

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

[0002] An antenna is provided on an electronic device for communication, and the environment of the electronic device is changeable, which leads to the changeable environment of the antenna assembly. For example, the antenna assembly may face the situation of being held by a hand, which will reduce the performance of the antenna assembly. Therefore, how to design an electronic device with an antenna assembly maintaining good antenna performance becomes a technical problem to be solved. SUMMARY

[0003] The present application provides an electronic device with an antenna assembly maintaining good antenna performance.

[0004] The electronic device provided by the present application comprises an antenna assembly, and the antenna assembly comprises:

[0005] A first radiator comprises a first end and a second end arranged oppositely, and a connection point and a feeding point arranged between the first end and the second end;

[0006] A signal source is electrically connected to the feeding point;

[0007] A second radiator comprises a third end and a fourth end arranged oppositely, and the third end is coupled to the second end through a gap, and the fourth end is grounded;

[0008] A first switch circuit has one end electrically connected to the connection point and the other end grounded; and

[0009] A second switch circuit has one end electrically connected to the first end and the other end grounded;

[0010] The working mode of the antenna assembly comprises a first working mode and a second working mode. In the first working mode, the first switch circuit is in a conducting state, and the second switch circuit is in a disconnected state. In the second working mode, the first switch circuit is in a disconnected state, and the second switch circuit is in a conducting state.

[0011] The electronic device provided by the embodiment of the present application comprises a first radiator comprising a first end and a second end arranged oppositely, and a connecting point and a feeding point arranged between the first end and the second end; a signal source is electrically connected to the feeding point; a second radiator comprises a third end and a fourth end arranged oppositely, the third end is coupled to the second end through a gap, and the fourth end is grounded; one end of a first switch circuit is electrically connected to the connecting point, and the other end of the first switch circuit is grounded; one end of a second switch circuit is electrically connected to the first end, and the other end of the second switch circuit is grounded; in this way, the working mode of the antenna assembly comprises at least a first working mode and a second working mode; in the first working mode, the first switch circuit is in a conducting state, and the second switch circuit is in a disconnected state, and the antenna assembly is a T+L type antenna; in the second working mode, the first switch circuit is in a disconnected state, and the second switch circuit is in a conducting state, and the antenna assembly is an IFA+L type antenna; in this way, the antenna assembly forms different antennas in different working modes, has different current distributions, and can maintain good antenna performance in various environments. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced.

[0013] Figure 1 is a structural schematic diagram of the electronic device provided by the embodiment of the present application;

[0014] Figure 2 is a structural exploded schematic diagram of the electronic device provided by the embodiment of the present application;

[0015] Figure 3 is a structural schematic diagram of the antenna assembly on the electronic device provided by the first embodiment of the present application;

[0016] Figure 4 is a structural schematic diagram of the antenna assembly provided by the first embodiment of the present application;

[0017] Figure 5 is a structural schematic diagram of the antenna assembly in a first working state provided by the first embodiment of the present application;

[0018] Figure 6 is a simplified schematic diagram of the antenna assembly in the first working state provided by the first embodiment of the present application;

[0019] Figure 7 is a structural schematic diagram of the antenna assembly in a second working state provided by the first embodiment of the present application;

[0020] Figure 8 is a simplified schematic diagram of the antenna assembly in the second working state provided by the first embodiment of the present application;

[0021] Figure 9 is a structural diagram of a first proximity sensor provided in an antenna assembly according to a first embodiment of the present application;

[0022] Figure 10 is a structural diagram of a first proximity sensor provided in an antenna assembly according to a first embodiment of the present application;

[0023] Figure 11 is a current distribution diagram of a first resonance mode of an antenna assembly according to a first embodiment of the present application;

[0024] Figure 12 is a current distribution diagram of a second resonance mode of an antenna assembly according to a first embodiment of the present application;

[0025] Figure 13 is a current distribution diagram of a third resonance mode of an antenna assembly according to a first embodiment of the present application;

[0026] Figure 14 is a current distribution diagram of a fourth resonance mode of an antenna assembly according to a first embodiment of the present application;

[0027] Figure 15 is a current distribution diagram of a fifth resonance mode of an antenna assembly according to a first embodiment of the present application;

[0028] Figure 16 is a current distribution diagram of a sixth resonance mode of an antenna assembly according to a first embodiment of the present application;

[0029] Figure 17 is a current distribution diagram of a seventh resonance mode of an antenna assembly according to a first embodiment of the present application;

[0030] Figure 18 is a structural diagram of an antenna assembly provided with a first tuning circuit in a first working mode according to a first embodiment of the present application;

[0031] Figure 19 is a structural diagram of a first tuning circuit according to an embodiment of the present application;

[0032] Figure 20 is a structural diagram of an antenna assembly provided with a second tuning circuit in a second working mode according to a first embodiment of the present application;

[0033] Figure 21 is a structural diagram of a second tuning circuit according to an embodiment of the present application;

[0034] Figure 22 is an S parameter curve and an efficiency curve diagram of an antenna assembly in a first working mode according to a first embodiment of the present application;

[0035] Figure 23 is a structural schematic diagram of an antenna assembly provided by a second embodiment of the present application on an electronic device;

[0036] Figure 24 is an S parameter curve and an efficiency curve diagram of the antenna assembly provided by the first embodiment of the present application in a second working mode;

[0037] Figure 25 is a hotspot distribution diagram of the antenna assembly provided by the first embodiment of the present application in a first working mode;

[0038] Figure 26 is a structural schematic diagram of the antenna assembly provided by the first embodiment of the present application in the first working mode and arranged at a bottom edge of an electronic device.

[0039] Explanation of structure reference numerals in the drawings:

[0040] Electronic device 1000; antenna assembly 100; display screen 200; middle frame 300; back cover 400; middle plate 310; frame 320; top edge 321; bottom edge 322; first side edge 323; second side edge 324; first radiator 10; second radiator 20; signal source 30; first switch circuit 40; second switch circuit 50; first end A; second end D; connection point B; feeding point C; third end E; fourth end F; reference ground plate 60; first matching circuit M1; first switch unit K1; second switch unit K2; proximity detector 70; detection electrode 71; detection circuit 72; third radiator 80; fifth end G; sixth end H; first tuning circuit T1; first tuning branch T11; second tuning circuit T2; second tuning branch T12. DETAILED DESCRIPTION

[0041] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the embodiments described in the present application are only some of the embodiments, but not all the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application. The following embodiments can be combined with each other in the case of not contradicting each other, and the combined embodiments also fall within the protection scope of the present application.

[0042] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described in this application can be combined with each other in their various permutations and combinations.

[0043] The terms "first", "second", and the like, in the description and in the claims of the application and in the above description of the drawings merely mean different objects and do not necessarily imply a sequence or order. In addition, the terms "comprise", "have" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a component of an assembly or a device that includes one or more components does not limit the components to the listed one or more components, but optionally includes additional components not listed, or inherent to such assembly or device, or should have one or more components based on the described function.

[0044] Please refer to Figure 1 , Figure 1 A structural schematic diagram of an electronic device 1000 is provided in the embodiments of the application. The electronic device 1000 includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a computer, a wearable device, a drone, a robot, a digital camera, and the like, which are devices with communication functions. The embodiments of the application take the mobile phone as an example for illustration, and other electronic devices can refer to the embodiments.

[0045] Please refer to Figure 2 , the electronic device 1000 includes an antenna assembly 100.

[0046] Please refer to Figure 2The working environment of the antenna assembly 100 is exemplified by taking the electronic device 1000 as a mobile phone. The electronic device 1000 includes a display screen 200, a middle frame 300, and a back cover 400 arranged in sequence along the thickness direction. The middle frame 300 includes a middle plate 310 and a frame 320 surrounding the side of the middle plate 310. Of course, in other embodiments, the electronic device 1000 can not have the middle plate 310. The display screen 200, the middle plate 310, and the back cover 400 are arranged in sequence, and a receiving space is formed between the display screen 200 and the middle plate 310 and between the middle plate 310 and the back cover 400 to accommodate devices such as a mainboard, a camera module, a receiver module, a battery, various sensors, and the like. One side of the frame 320 surrounds the edge of the display screen 200, and the other side of the frame 320 surrounds the edge of the back cover 400 to form the complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, and the frame 320 and the back cover 400 can be a split structure. The above is the working environment of the antenna assembly 100 taking the mobile phone as an example, but the antenna assembly 100 of the present application is not limited to the above working environment.

[0047] Referring to Figure 3 The frame 320 includes oppositely arranged top and bottom edges 321 and 322, and first and second side edges 323 and 324 connected to the top and bottom edges 321 and 322. The top edge 321 is the edge away from the ground when the user holds the electronic device 1000, and the bottom edge 322 is the edge towards the ground when the user holds the electronic device 1000.

[0048] Referring to Figure 4 The antenna assembly 100 provided by the first embodiment of the present application includes a first radiator 10, a second radiator 20, a signal source 30, a first switch circuit 40, and a second switch circuit 50.

[0049] The first radiator 10 is a port for the antenna assembly 100 to transmit and receive radio frequency signals. The radio frequency signals are transmitted in the form of electromagnetic wave signals in air medium. The material of the first radiator 10 is not specifically limited in the present application. Optionally, the material of the first radiator 10 is a conductive material, including but not limited to metal, alloy, and the like.

[0050] The shape of the first radiator 10 is not specifically limited in the present application. For example, the shape of the first radiator 10 includes but is not limited to a strip shape, a sheet shape, a rod shape, a coating shape, a film shape, and the like. Figure 3The first radiator 10 shown is only an example and does not limit the shape of the first radiator 10 provided in the present application. In the embodiment, the first radiator 10 is in the form of a strip. The present application does not limit the extension trajectory of the first radiator 10. Optionally, the first radiator 10 can extend in a straight line, or extend in a curve, or extend in a bent line. In the embodiment, the first radiator 10 is in the form of a straight line. In other embodiments, the first radiator 10 can also extend in a bent line or the like. The first radiator 10 described above can be a line with uniform width in the extension trajectory, or can be a strip with non-uniform width, such as a gradually changing width, or a widened region.

[0051] The present application does not specifically limit the form of the first radiator 10. Optionally, the form of the first radiator 10 includes but is not limited to a metal frame 320, a metal frame (metal insert) inlaid in a plastic frame 320, a metal first radiator 10 located in or on the frame 320, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct structuring (LDS) antenna formed by laser direct structuring, a print direct structuring (PDS) antenna formed by print direct structuring, a conductive sheet antenna (such as a metal support antenna), and the like.

[0052] Please refer to Figure 4 The first radiator 10 includes a first end A and a second end D arranged opposite to each other, and a connection point B and a feed point C located between the first end A and the second end D. The present application does not limit the specific positions of the connection point B and the feed point C.

[0053] The second end D is an end disconnected from other structures. The second end D can also be referred to as a free end. The first end A can be disconnected or connected to structures outside the first radiator 10. The present application does not specifically limit the positions of the connection point B and the feed point C between the first end A and the second end D.

[0054] In an optional embodiment, the connection point B and the feed point C are located at the same point. At this time, the feed point C is electrically connected to the signal source 30 through a matching circuit, part of the matching circuit is connected in series between the feed point C and the signal source 30, and the other part is connected to ground through a capacitor and / or inductor, so as to electrically connect the feed point C to the signal source 30, and the connection point B is used for grounding.

[0055] In another alternative embodiment, the feeding point C is located close to the center between the first end A and the second end D. For example, the feeding point C is located close to the center between the first end A and the second end D at a distance less than 1 / 4 of the total length of the first radiator 10. The feeding point C is electrically connected to the signal source 30, or the feeding point C is electrically connected to the signal source 30 through a matching circuit. The connection point B is located between the first end A and the feeding point C or between the second end D and the feeding point C, and the connection point B is located close to the feeding point C, and the connection point B is used for grounding.

[0056] The following embodiments are exemplified by taking the connection point B as an example located between the feeding point C and the first end A.

[0057] The signal source 30 is electrically connected to the feeding point C. In this embodiment, the first radiator 10 is a main radiator, and the second radiator 20 is a parasitic radiator.

[0058] The signal source 30 includes but is not limited to a radio frequency transceiver chip and the like. The signal source 30 is used to provide a radio frequency excitation current, and after the radio frequency excitation current is transmitted to the first radiator 10, the radio frequency excitation current can excite the first radiator 10 to generate a resonant current, form a resonant mode, and cover a radio frequency band of electromagnetic wave transmission and reception.

[0059] In the embodiment of the present application, the signal source 30 is arranged on the main board. The electrical connection mode of the signal source 30 and the feeding point C includes but is not limited to direct welding or indirect connection through a coaxial line, a microstrip line, a conductive spring, conductive glue, and the like. Specifically, the signal source 30 is electrically connected to the feeding point C through the feeding spring (conductive spring) arranged on the main board.

[0060] The second radiator 20 can refer to the first radiator 10. In this embodiment, the first radiator 10 and the second radiator 20 are taken as metal inserts of the frame 320 of the electronic device 1000 as an example.

[0061] Referring to Figure 4 , the second radiator 20 includes a third end E and a fourth end F arranged oppositely, and the third end E is coupled to the second end D through a gap. In this embodiment, the third end E is an end disconnected from other structures. The third end E can also be referred to as a free end. The fourth end F can be disconnected or connected to structures outside the second radiator 20. In other words, the second end D and the third end E generate an electric field under an electrical signal, and although the second end D and the third end E are separated by a gap, current signals can also be transmitted. The fourth end F is grounded. In this embodiment, the "grounding" includes direct grounding or indirect grounding. Specifically, the fourth end F is used for electrical connection to the reference ground plate 60.

[0062] Referring to Figure 4 , the antenna assembly 100 further includes a first matching circuit M1.

[0063] The first matching circuit M1 is electrically connected between the signal source 30 and the feeding point C. The first matching circuit M1 includes at least one of a capacitor and an inductor, and the first matching circuit M1 matches the impedance of the port of the signal source 30 and the port of the first radiator 10, so as to facilitate the signal source 30 to excite the first resonant mode on the first radiator 10.

[0064] Specifically, the first matching circuit M1 includes but is not limited to a capacitor, and can also be an inductor, can be a series device of a capacitor and an inductor, can be a parallel device of a capacitor and an inductor, can be a parallel device of the above-mentioned series device and a capacitor, can be a parallel device of the above-mentioned series device and an inductor, can be a parallel device of two above-mentioned series devices, can be a series device of two above-mentioned parallel devices, and the like.

[0065] The second end D of the first radiator 10 and the third end E of the second radiator 20 are coupled, that is, the first radiator 10 and the second radiator 20 form a mouth-to-mouth antenna, and the excitation signal excited by the signal source 30 can be transmitted to the second radiator 20, that is, the first radiator 10 and the second radiator 20 can be used by the signal source 30. After the first radiator 10 and the second radiator 20 are coupled, the electrical length of the first radiator 10 and the second radiator 20 can be reduced, and thus the overall size of the first radiator 10 and the second radiator 20 can be reduced.

[0066] One end of the first switch circuit 40 is electrically connected to the connection point B, and the other end of the first switch circuit 40 is grounded.

[0067] The first switch circuit 40 is used to be connected to or disconnected from the reference floor 60. In other words, the connection point B of the first radiator 10 has a state of being connected to the reference floor 60 or a state of being disconnected from the reference floor 60.

[0068] Please refer to Figure 5 The first switch circuit 40 includes at least a first switch unit K1. The first switch unit K1 has a conductive state or an open circuit state. The first switch unit K1 includes but is not limited to at least one of a field effect tube, a triode, a transistor, and the like.

[0069] One end of the second switch circuit 50 is electrically connected to the first end A, and the other end of the second switch circuit 50 is grounded.

[0070] The second switch circuit 50 is used to be connected to or disconnected from the reference floor 60. In other words, the connection point B of the second radiator 20 has a state of being connected to the reference floor 60 or a state of being disconnected from the reference floor 60.

[0071] Please refer to Figure 6The second switch circuit 50 comprises at least a second switch unit K2. The second switch unit K2 has a conducting state or an open state. The second switch unit K2 comprises at least one of a field effect transistor, a triode, a transistor, etc.

[0072] The operation mode of the antenna assembly 100 comprises at least a first operation mode and a second operation mode.

[0073] Referring to Figure 5 and Figure 6 In the first operation mode, the first switch circuit 40 is in the conducting state, and the second switch circuit 50 is in the open state. Specifically, the connection point B of the first radiator 10 is electrically connected to the reference ground plate 60, and the first end A of the first radiator 10 is disconnected from the reference ground plate 60, so that the first end A of the first radiator 10 is equivalent to a free end. The first radiator 10 and the signal source 30 form a T-shaped antenna. One end of the second radiator 20 is a free end, and the other end is grounded, so that the second radiator 20 is approximately L-shaped. The first radiator 10, the signal source 30 and the second radiator 20 form a T+L-shaped antenna.

[0074] Optionally, the connection point B can be directly grounded, or grounded through a third matching circuit M3. The third matching circuit M3 can be a capacitor or an inductor, to adjust the electrical length of the first radiator 10.

[0075] Referring to Figure 7 and Figure 8 In the second operation mode, the first switch circuit 40 is in the open state, and the second switch circuit 50 is in the conducting state. Specifically, the connection point B of the first radiator 10 is disconnected from the reference ground plate 60, and the first end A of the first radiator 10 is electrically connected to the reference ground plate 60, so that the first end A of the first radiator 10 is equivalent to a grounded end. The first radiator 10 and the signal source 30 form an IFA-shaped antenna. One end of the second radiator 20 is a free end, and the other end is grounded, so that the second radiator 20 is approximately L-shaped. The first radiator 10, the signal source 30 and the second radiator 20 form an IFA+L-shaped antenna.

[0076] Of course, the antenna assembly 100 can further include a third operating mode and a fourth operating mode. In the third operating mode, the first switch circuit 40 and the second switch circuit 50 are both in the on state. In the third operating mode, the antenna assembly 100 can support the UHB frequency band. For example, in the first operating mode and the second operating mode, the antenna assembly 100 can support the B1, B3, B40, and B41 frequency bands. In the third operating mode, the antenna assembly 100 can support the N78 frequency band. In this embodiment, substantially no current flows between the first end A of the first radiator 10 and the connection point B. In this embodiment, the electronic device 1000 can further include another N78 antenna adjacent to the first end A of the first radiator 10 on the frame 320. In this case, the first end A of the first radiator 10 and the connection point B can serve as a signal isolation device for the two N78 antennas. Further, the electronic device 1000 can further include two other N78 antennas on the frame 320 to form a 4*4 MIMO antenna group for the N78 frequency band or a plurality of N78 antennas for smart switching.

[0077] In the fourth operating mode, the first switch circuit 40 and the second switch circuit 50 are both in the off state. In the fourth operating mode, the antenna assembly 100 can be switched to a dipole antenna to form a new current distribution.

[0078] Generally, the sensitivity of the free end to hand shielding is much higher than the sensitivity of the grounded end to hand shielding. During hand holding, the hand holding the free end has a greater impact on the current distribution and resonance mode of the antenna assembly 100, causing frequency deviation and even failure to support the frequency band.

[0079] The antenna assembly 100 provided in this application can change its antenna form by switching the states of the first switch circuit 40 and the second switch circuit 50, thereby forming different resonance modes and changing the grounding state of the end, thereby changing the sensitivity of the end to hand shielding of the test object. When the operating mode of the antenna assembly 100 is switched from the first operating mode to the second operating mode, the first end A of the antenna assembly 100 is switched from the free end to the grounded end, the form of the antenna assembly 100 is changed, and at least the sensitivity of the first end A of the antenna assembly 100 to hand holding is changed. For example, when the position of the first end A is held by the hand, the antenna assembly 100 can operate in the second operating mode, so that the antenna assembly 100 can maintain good antenna performance in various environments.

[0080] The electronic device 1000 provided by the embodiment of the present application comprises the first radiator 10, the second radiator 20, the signal source 30, the first switch circuit 40, and the second switch circuit 50. The first radiator 10 comprises the first end A and the second end D arranged oppositely, and the connecting point B and the feeding point C arranged between the first end A and the second end D. The signal source 30 is electrically connected to the feeding point C. The second radiator 20 comprises the third end E and the fourth end F arranged oppositely. The third end E is coupled to the second end D through a gap, and the fourth end F is grounded. One end of the first switch circuit 40 is electrically connected to the connecting point B, and the other end of the first switch circuit 40 is grounded. One end of the second switch circuit 50 is electrically connected to the first end A, and the other end of the second switch circuit 50 is grounded. In this way, the working mode of the antenna assembly 100 comprises at least the first working mode and the second working mode. In the first working mode, the first switch circuit 40 is in the on state, and the second switch circuit 50 is in the off state. The antenna assembly 100 is a T+L type antenna. In the second working mode, the first switch circuit 40 is in the off state, and the second switch circuit 50 is in the on state. The antenna assembly 100 is an IFA+L type antenna. In this way, the antenna assembly 100 forms different antennas in different working modes, has different current distributions, and can maintain good antenna performance in various environments.

[0081] The following is an example of a working scenario of the electronic device 1000 in combination with the accompanying drawings. All other embodiments obtained by those skilled in the art without creative labor based on the embodiments provided by the present application belong to the protection scope of the present application.

[0082] Please refer to Figure 9 The electronic device 1000 further comprises a proximity detector 70. The proximity detector 70 is electrically connected to the antenna assembly 100. The antenna assembly 100 is used to switch to the second working mode when the proximity detector 70 detects that a to-be-tested subject approaches the first end A of the first radiator 10.

[0083] The present application does not make specific limitations on the proximity detector 70. The proximity detector 70 is used to detect whether a to-be-tested subject approaches the antenna assembly 100. Further, the proximity detector 70 is used to detect whether the first end A of the first radiator 10 is blocked by the hand of the to-be-tested subject.

[0084] When the proximity detector 70 detects that the hand of the to-be-tested subject covers the first end A of the first radiator 10, the antenna assembly 100 switches to work in the second working mode, improves the sensitivity of the first end A of the first radiator 10 to the hand, reduces the influence of the hand blockage on the frequency band supported by the antenna assembly 100, and ensures the working efficiency of the antenna assembly 100 in different holding scenarios.

[0085] Optionally, when the proximity detector 70 detects that the distance between the to-be-tested subject and the first end A of the first radiator 10 is outside the preset distance, the antenna assembly 100 is switched to work in the first working mode.

[0086] Further, referring to Figure 9 and Figure 10 , the proximity detector 70 comprises a detection electrode 71 and a detection circuit 72. The detection electrode 71 can be the same structure as the first radiator 10, or the detection electrode 71 is a part of the metal frame 320 and is arranged adjacent to the first end A of the first radiator 10. In the design, the detection electrode 71 is equivalent to a suspended direct current signal. In the design of the detection circuit 72, the detection circuit 72 comprises a device that isolates alternating current signals.

[0087] The present application does not limit the frequency band supported by the antenna assembly 100. In other words, the antenna assembly 100 can support at least one of the LB frequency band (less than 1 GHz), the MHB frequency band (1-3 GHz), the UHB frequency band (more than 3 GHz), the Wi-Fi frequency band, etc.

[0088] Optionally, the antenna assembly 100 can cover the same sub-frequency band in the first working mode and the second working mode. For example, the working frequency band of the antenna assembly 100 in the first working mode and the second working mode both include the B3 frequency band, the B1 frequency band, the B39 frequency band, the B40 frequency band, and the B41 frequency band. Alternatively, for example, the working frequency band of the antenna assembly 100 in the first working mode and the second working mode both include the B3 frequency band, the B1 frequency band, and the B39 frequency band.

[0089] Specifically, the antenna assembly 100 can cover a target frequency band in the first working mode and the second working mode. In other words, the working frequency band of the antenna assembly 100 in the first working mode and the second working mode is the target frequency band. The bandwidth of the target frequency band is greater than or equal to 1 GHz. Further, the working frequency band of the antenna assembly 100 in the first working mode and the second working mode covers 1.5-2.7 GHz. The bandwidth of the working frequency band of the antenna assembly 100 in the first working mode and the second working mode is greater than or equal to 1 GHz.

[0090] The present application switches the working state of the antenna assembly 100 through the first switch circuit 40 and the second switch circuit 50 to ensure that the antenna assembly 100 can support a wider bandwidth, form a wideband antenna, and ensure that the antenna assembly 100 has stable antenna performance when the first end A of the first radiator 10 is blocked by a hand, and maintains its wideband antenna performance.

[0091] In the first working mode or the second working mode, the first radiator 10 and the second radiator 20 form at least three resonant modes under the excitation of the signal source 30. Specifically, the number of resonant modes formed by the first radiator 10 and the second radiator 20 under the excitation of the signal source 30 includes three, four, etc.

[0092] The embodiments of the present application generate at least three resonant modes under the excitation of the signal source 30 by the first radiator 10 and the second radiator 20, to generate multiple resonant modes. The resonant frequency points of the multiple resonant modes are close to each other, so that the frequency bands supported by each resonant mode form a continuous frequency band. For example, the frequency bands supported by the three resonant modes are 1.5-2.1 GHz, 1.5-2.5 GHz, and 2.5-2.8 GHz, respectively, forming a continuous frequency band of 1.5-2.8 GHz.

[0093] The resonant modes of the antenna assembly 100 in the first working mode are exemplified below in combination with the accompanying drawings.

[0094] Please refer to Figure 11 In the first working mode, the first radiator 10 and the second radiator 20 form a first resonant mode supporting a first frequency band under the excitation of the signal source 30. In other words, in the first working mode, the excitation signal provided by the signal source 30 forms a resonance of the first frequency band on the first radiator 10 and the second radiator 20, which is named as the first resonant mode in the present application. The first resonant mode is characterized in that the resonant current of the first resonant mode includes a first sub-resonant current formed between the first end A and the connection point B, and a second sub-resonant current formed between the second end D and the connection point B. The current intensity of the first sub-resonant current is greater than that of the second sub-resonant current. The mode of the first sub-resonant current is 1 / 4 wavelength mode of the first frequency band. The directions of the first sub-resonant current and the second sub-resonant current are opposite.

[0095] Specifically, the resonant current of the first resonant mode flows from the reference ground plane 60 to the first end A and the second end D through the second switch circuit 50 and the connection point B. Of course, due to the periodicity of the current, the direction of the resonant current of the first resonant mode can also be opposite to the above current direction. The part of the resonant current of the first resonant mode between the first end A and the connection point B is a strong current. The first sub-resonant current makes a major contribution to the radiation of the first resonant mode, and the current mode of the first sub-resonant current also determines the size of the frequency band supported by the first resonant mode. For example, the current mode of the first sub-resonant current is 1 / 4 wavelength mode from the connection point B to the first end A, that is, the electrical length from the connection point B to the first end A is close to 1 / 4 wavelength of the first frequency band. The electrical length mentioned in the present application can satisfy the following formula:

[0096]

[0097] wherein L is the physical length, a is the transmission time in the medium, and b is the transmission time in free space.

[0098] In the embodiment, the center frequency of the first frequency band is 1.8 GHz, and the first frequency band is an effective frequency band in which the return loss corresponding to the first resonance mode is less than -3 dB, or less than -4 dB, or less than -5 dB. In the embodiment, the first frequency band is 1.5-2.1 GHz, which can effectively support the B3 frequency band, the B1 frequency band, and the B39 frequency band.

[0099] Please refer to Figure 12 In the first working mode, the first radiator 10 and the second radiator 20 also form a second resonance mode supporting a second frequency band under the excitation of the signal source 30. In other words, in the first working mode, the excitation signal provided by the signal source 30 also forms a resonance of the second frequency band on the first radiator 10 and the second radiator 20, which is named as the second resonance mode in the application. The resonance is characterized in that the resonance current of the second resonance mode includes a third sub-resonance current formed between the first end A and the second end D and a fourth sub-resonance current formed between the third end E and the fourth end F. The current intensity of the third sub-resonance current between the connection point B and the second end D is greater than the current intensity of the third sub-resonance current between the connection point B and the first end A. The current intensity of the third sub-resonance current between the connection point B and the second end D is greater than the current intensity of the fourth sub-resonance current. The mode of the third sub-resonance current is a 1 / 2 wavelength mode of the second frequency band. The directions of the third sub-resonance current and the fourth sub-resonance current are the same.

[0100] Specifically, the resonant current of the second resonant mode flows from the first end A to the second end D, and flows from the third end E to the fourth end F of the second radiator 20 through the coupling gap, and then flows to the ground through the fourth end F. Of course, due to the periodicity of the current, the current direction of the resonant current of the second resonant mode can also be opposite to the above current direction. The part of the resonant current of the second resonant mode between the connection point B and the second end D is a strong current. The resonant current between the connection point B and the second end D makes a major contribution to the radiation of the second resonant mode, and the current mode of the resonant current between the connection point B and the second end D also determines the frequency band size supported by the second resonant mode. The mode of the third sub-resonant current is a 1 / 2 wavelength mode of the second frequency band. Among them, the current mode of the resonant current between the connection point B and the second end D is a 1 / 4 wavelength mode from the connection point B to the second end D, in other words, the electrical length from the connection point B to the second end D is close to 1 / 4 wavelength of the second frequency band.

[0101] The first resonant mode and the second resonant mode described above are analyzed, wherein the second resonant mode described above can be divided into a first sub-resonant mode formed by the resonant current between the first end A and the second end D, and a second sub-resonant mode formed by the resonant current between the connection point B and the fourth end F. Among them, the antenna part where the first sub-resonant mode is located is a T-shaped antenna, and the antenna part where the second sub-resonant mode is located is a mouth-to-mouth antenna with a free end facing a free end.

[0102] Among them, the first resonant mode and the first sub-resonant mode form a set of T-shaped antenna radiation modes and balanced modes. Among them, the resonant current of the first resonant mode flows from the reference ground plane 60 to the two ends of the T-shaped antenna, and the first resonant mode is also called a high mode radiating mode. Among them, the resonant current of the first sub-resonant mode flows from one end of the T-shaped antenna to the other end, and the first sub-resonant mode is also called a high mode balanced mode. Generally, after the high mode radiating mode and the high mode balanced mode are generated in the antenna assembly 100, the efficiency will be higher, thereby improving the wave boost within the antenna band.

[0103] When the first frequency band and the second frequency band are close (for example, less than 1GHz), the first frequency band and the second frequency band form a continuous frequency band, have a good bandwidth, and have a good efficiency bandwidth.

[0104] In the embodiment, the center frequency of the second frequency band is 2.2GHz, and the second frequency band is an effective frequency band in which the return loss corresponding to the second resonant mode is less than -3dB, or less than -4dB, or less than -5dB. In the embodiment, the second frequency band is 2.1-2.5GHz, which can effectively cover the B40 frequency band.

[0105] The second resonance mode formed in the embodiment has strong current distributed in the portion between the second end D and the connection point B. The current in this portion can act towards both sides, and further form a radiating mode of the mouth-to-mouth antenna towards the side where the second radiator 20 is located, and form a balanced mode of the T-shaped antenna towards the side away from the second radiator 20. Therefore, the second resonance mode is a fusion mode of the radiating mode of the mouth-to-mouth antenna and the balanced mode of the T-shaped antenna.

[0106] Please refer to Figure 13 In the first working mode, the first radiator 10 and the second radiator 20 also form a third resonance mode supporting a third frequency band under the excitation of the signal source 30. In other words, in the first working mode, the excitation signal provided by the signal source 30 forms a resonance of the third frequency band on the first radiator 10 and the second radiator 20, which is named as the third resonance mode in the present application. The third resonance mode is characterized in that the resonance current of the third resonance mode includes a fifth sub-resonance current formed between the first end A and the second end D, and a sixth sub-resonance current formed between the third end E and the fourth end F. The current intensity of the sixth sub-resonance current is greater than that of the fifth sub-resonance current. The mode of the sixth sub-resonance current is a 1 / 4 wavelength mode of the third frequency band. The directions of the fifth sub-resonance current and the sixth sub-resonance current are opposite.

[0107] Specifically, the resonance current of the third resonance mode flows from the first end A to the second end D, and from the reference ground plane 60 to the third end E through the fourth end F of the second radiator 20. Of course, due to the periodicity of the current, the current direction of the resonance current of the third resonance mode can also be completely opposite to the above current direction. The sixth sub-resonance current in the resonance current of the third resonance mode is a strong current. The sixth sub-resonance current mainly contributes to the radiation of the third resonance mode, and the current mode of the sixth sub-resonance current also determines the size of the frequency band supported by the third resonance mode. The mode of the fifth sub-resonance current is a 1 / 2 wavelength mode of the second frequency band. The current mode of the sixth sub-resonance current is a 1 / 4 wavelength mode from the third end E to the fourth end F. In other words, the electrical length from the third end E to the fourth end F is close to 1 / 4 wavelength of the third frequency band.

[0108] The second resonance mode and the third resonance mode described above are analyzed. The third resonance mode can be divided into a third sub-resonance mode formed by the resonance current between the first end A and the second end D, and a fourth sub-resonance mode formed by the resonance current between the connection point B and the fourth end F. The antenna part of the third sub-resonance mode is a T-shaped antenna, and the antenna part of the fourth sub-resonance mode is a mouth-to-mouth antenna with free ends facing each other.

[0109] The second sub-resonance mode and the fourth sub-resonance mode form a set of radiation modes and balanced modes of the mouth-to-mouth antenna (E-E mode, i.e., electric field-electric field mode). The second sub-resonance mode generates a same-direction current from the connection point B to the second end D and from the third end E to the fourth end F, and is also called a high mode radiation mode. The fourth sub-resonance mode generates a reverse current from the connection point B to the second end D and from the third end E to the fourth end F, and is also called a high mode balanced mode. Generally, after the high mode radiation mode and the high mode balanced mode are generated in the antenna assembly 100, the efficiency is relatively high, and the wave boost in the antenna band is improved.

[0110] When the second frequency band is close to the third frequency band (for example, less than 1 GHz), the second frequency band and the third frequency band form a continuous frequency band, have a good bandwidth, and have a good efficiency bandwidth.

[0111] In this embodiment, the center frequency of the third frequency band is 2.6 GHz, and the third frequency band is an effective frequency band in which the return loss corresponding to the third resonance mode is less than -3 dB, or less than -4 dB, or less than -5 dB. In this embodiment, the third frequency band is 2.5-2.8 GHz, and can effectively cover the B41 frequency band.

[0112] The third resonance mode formed in this embodiment has a strong current distribution between the third end E and the fourth end F, and the first radiator 10 is a main radiator, thereby forming a fusion mode of the balanced mode of the mouth-to-mouth antenna and the balanced mode of the T-shaped antenna.

[0113] The radiation mode + the balanced mode of the mouth-to-mouth antenna can improve the in-band efficiency of the mouth-to-mouth antenna, and generate an efficiency dip after the balanced mode of the mouth-to-mouth antenna. The balanced mode + the balanced mode of the T-shaped antenna can improve the in-band efficiency of the mouth-to-mouth antenna, and generate an efficiency dip after the balanced mode of the T-shaped antenna. Relatively speaking, the efficiency dip of the T-shaped antenna is small, i.e., the efficiency is reduced relatively less, for example, from -3 dB to about -4.5 dB. Therefore, the T-shaped antenna has the potential to form a wideband antenna, i.e., the radiation mode and the balanced mode formed by the T-shaped antenna, in combination with other modes, can cover a large bandwidth.

[0114] In the embodiment of the application, the electrical length from the connection point B to the first end A is designed to be greater than the electrical length from the connection point B to the second end D, so that the center frequency point of the first frequency band is less than the center frequency point of the second frequency band. Moreover, the electrical length from the connection point B to the second end D is designed to be greater than the electrical length from the third end E to the fourth end F, so that the center frequency point of the second frequency band is less than the center frequency point of the third frequency band. The above design sets the resonant frequency point of the balanced mode of the mouth-to-mouth antenna at the highest frequency point position, which not only utilizes the radiation mode + balanced mode to improve the in-band efficiency of the wideband of the mouth-to-mouth antenna, but also sets the efficiency pit of the balanced mode of the mouth-to-mouth antenna outside the wideband. The first frequency band, the second frequency band and the third frequency band form a continuous frequency band capable of covering a bandwidth greater than or equal to 1GHz, so that the antenna assembly 100 can support a wideband of more than 1GHz.

[0115] In the application, a capacitance or inductance element can be arranged between the fourth end F and the ground end to change the electrical length between the third end E and the fourth end F. For example, the physical length between the third end E and the fourth end F can be reduced, and an inductance element is arranged to compensate for the reduction of the physical length between the third end E and the fourth end F.

[0116] Generally, when designing an antenna assembly 100 that covers the B3 frequency band, the B1 frequency band, the B39 frequency band, the B40 frequency band and the B41 frequency band at the same time, the antenna assembly 100 needs to cover a bandwidth of 1.5-2.8GHz, and the frequency band supported by each antenna assembly 100 is limited. If a switch is used to switch the sub-frequency band, it will not be able to support each of the above-mentioned frequency bands at the same time. If multiple antenna assemblies 100 are used to support the above-mentioned B3 frequency band, B1 frequency band, B39 frequency band, B40 frequency band and B41 frequency band at the same time, the space occupied by the multiple antenna assemblies 100 on the electronic device 1000 is large.

[0117] Based on the above problems, the antenna assembly 100 provided in the application is designed by designing the antenna structure to generate multiple resonance modes on the antenna structure, and the size of the resonance frequency points of the multiple resonance modes is designed to achieve wideband and further improve the in-band efficiency. The B3 frequency band, the B1 frequency band, the B39 frequency band, the B40 frequency band and the B41 frequency band can be supported at the same time without the need for a switch to switch and without the need for multiple antenna assemblies 100.

[0118] Please refer to Figure 14The second embodiment of the present application also provides an antenna assembly 100. The antenna assembly 100 of the present embodiment is compared with the antenna assembly 100 provided by the first embodiment. The antenna assembly 100 further comprises a third radiator 80. The third radiator 80 comprises a fifth end G and a sixth end H arranged oppositely. The fifth end G is a free end. In the first working mode, the fifth end G is coupled with the first end A through a gap. The sixth end H is grounded. Optionally, the sixth end H can be directly grounded or grounded through a second matching circuit M2. The second matching circuit M2 can be a capacitor or an inductor to adjust the electrical length of the second radiator 20.

[0119] The third radiator 80 forms an L-shaped parasitic antenna. The second radiator 20, the first radiator 10 and the third radiator 80 form an L+T+L-shaped antenna to generate more resonance modes and support more frequency bands.

[0120] Please refer to Figure 14 The embodiment of the present application not only generates the first resonance mode, the second resonance mode and the third resonance mode as described above, but also forms a fourth resonance mode supporting a fourth frequency band under the excitation of the signal source 30.

[0121] In other words, please refer to Figure 14 In the first working mode, the excitation signal provided by the signal source 30 forms a resonance of the fourth frequency band on the first radiator 10 and the third radiator 80, which is named as the fourth resonance mode in the present application. The characteristic of the resonance is that the resonance current of the fourth resonance mode comprises a seventh sub-resonance current formed between the first end A and the second end D and an eighth sub-resonance current formed between the fifth end G and the sixth end H. The current intensity of the eighth sub-resonance current is greater than that of the seventh sub-resonance current. The mode of the eighth sub-resonance current is a 1 / 4 wavelength mode of the fourth frequency band. The directions of the seventh sub-resonance current and the eighth sub-resonance current are the same.

[0122] Specifically, the resonance current of the fourth resonance mode flows from the second end D to the first end A and from the fifth end G to the sixth end H through the coupling gap. Of course, due to the periodicity of the current, the current direction of the resonance current of the fourth resonance mode can also be completely opposite to the above current direction. The eighth sub-resonance current in the resonance current of the fourth resonance mode is a strong current. The eighth sub-resonance current mainly contributes to the radiation of the fourth resonance mode, and the current mode of the eighth sub-resonance current also determines the size of the frequency band supported by the fourth resonance mode. The mode of the seventh sub-resonance current is a 1 / 2 wavelength mode of the second frequency band. The current mode of the eighth sub-resonance current is a 1 / 4 wavelength mode from the fifth end G to the sixth end H. In other words, the electrical length from the fifth end G to the sixth end H is close to 1 / 4 wavelength of the fourth frequency band.

[0123] The first resonance mode and the fourth resonance mode are analyzed, wherein the fourth resonance mode can be divided into a fifth sub-resonance mode formed by the resonant current between the first end A and the second end D, and a sixth sub-resonance mode formed by the resonant current between the connection point B and the fourth end F. The fifth sub-resonance mode is a T-shaped antenna, and the sixth sub-resonance mode is a mouth-to-mouth antenna.

[0124] The first resonance mode and the fifth sub-resonance mode form the radiation mode and the balanced mode of the T-shaped antenna. The sixth sub-resonance mode is the radiation mode of the mouth-to-mouth antenna.

[0125] In this embodiment, the electrical length between the connection point B and the first end A is greater than the electrical length between the connection point B and the second end D, so the radiation section between the connection point B and the first end A is the main radiation section compared to the radiation section between the connection point B and the second end D. In this way, the resonant current on the main radiation section can affect the resonant current on the third radiation body 80, thereby generating the fusion mode of the radiation mode of the mouth-to-mouth antenna and the balanced mode of the T-shaped antenna.

[0126] Of course, in other embodiments, the electrical length between the connection point B and the first end A is less than the electrical length between the connection point B and the second end D, and the radiation section between the connection point B and the second end D is the main radiation section. The current distribution of the first resonance mode in this embodiment does not change compared to the first resonance mode to the fourth resonance mode described above, and the intensity distribution changes such that the current intensity area of the first resonance mode is located in the radiation section between the connection point B and the second end D. The resonant frequency point of the third resonance mode is after the resonant frequency point of the first resonance mode, the resonant frequency point of the second resonance mode is after the resonant frequency point of the third resonance mode, and the current distribution and intensity distribution of the fourth resonance mode remain unchanged.

[0127] In this embodiment, the center frequency point of the fourth frequency band is greater than the center frequency point of the first frequency band. The center frequency point of the fourth frequency band is less than the center frequency point of the third frequency band.

[0128] Because the balanced mode of the mouth-to-mouth antenna will produce an efficiency pit afterwards, the center frequency point of the fourth frequency band is less than the center frequency point of the third frequency band.

[0129] In the embodiment, the center frequency point of the fourth frequency band is between the center frequency point of the first frequency band and the center frequency point of the second frequency band. For example, the center frequency point of the first frequency band is 1.7 GHz, the center frequency point of the fourth frequency band is 1.9 GHz, the center frequency point of the second frequency band is 2.2 GHz, and the center frequency point of the third frequency band is 1.6 GHz. The first frequency band, the fourth frequency band, the second frequency band, and the third frequency band form a continuous frequency band covering 1.5-2.8 GHz, and can simultaneously cover the B3 frequency band, the B1 frequency band, the B39 frequency band, the B40 frequency band, and the B41 frequency band.

[0130] Referring to Figure 15 In the first and second embodiments of the present application, in the second working mode, the first radiator 10 and the second radiator 20 form a fifth resonant mode supporting a fifth frequency band under the excitation of the signal source 30. In other words, in the second working mode, the excitation signal provided by the signal source 30 forms a resonance of the fifth frequency band on the first radiator 10 and the second radiator 20, which is named as the fifth resonant mode in the present application. The fifth resonant mode is characterized in that the resonant current of the fifth resonant mode includes a ninth sub-resonant current formed between the first end A and the second end D. Specifically, the ninth sub-resonant current flows from the reference floor 60 to the second end D through the first end A. Due to the periodicity of the current, the ninth sub-resonant current can also be in the opposite direction. The mode of the ninth sub-resonant current is a 1 / 4 wavelength mode of the fifth frequency band. In other words, the electrical length between the first end A and the second end D is close to 1 / 4 wavelength of the fifth frequency band.

[0131] Further referring to Figure 15 The second switch circuit 50 includes a second switch unit K2 and a capacitor C1. One end of the second switch unit K2 is electrically connected to the first end A, the other end of the second switch unit K2 is electrically connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded.

[0132] In the embodiments of the present application, the electrical length between the connection point B and the first end A is close to 1 / 4 wavelength of the first frequency band, which is about 1.8 GHz. In the case that the length of the first radiator 10 is unchanged, the second switch circuit 50 is switched off, and the first switch circuit 40 is switched on, in order to adjust the fifth frequency band to belong to the MHB frequency band, the capacitor C1 can be connected in series with the first end A to return to the ground. The capacitor C1 can reduce the electrical length of the first radiator 10. The electrical length of the capacitor C1 and the first radiator 10 is about the electrical length from the first end A to the connection point B, so that the fifth frequency band belongs to the MHB frequency band. The present application does not specifically limit the capacitance value of the capacitor C1. Optionally, the center frequency point of the fifth frequency band is about 1.8 GHz, and the fifth frequency band covers about 1.6-2 GHz. The B3 frequency band, the B1 frequency band, and the B39 frequency band can be effectively covered.

[0133] Further, please refer to Figure 16 The first radiator 10 and the second radiator 20 also form a sixth resonant mode supporting a sixth frequency band under the excitation of the signal source 30. The resonant current of the sixth resonant mode includes a tenth sub-resonant current formed between the feed point C and the second end D, and an eleventh sub-resonant current between the third end E and the fourth end F. The resonant current of the sixth resonant mode flows from the feed point C to the second end D, and then from the third end E to the fourth end F through the coupling gap. Due to the periodicity of the current, the resonant current of the sixth resonant mode can be opposite to the above current.

[0134] The current intensity of the tenth sub-resonant current is greater than that of the eleventh sub-resonant current. The part of the sixth resonant mode between the feed point C and the second end D is the main mode, which mainly contributes to the radiation. The current direction of the tenth sub-resonant current is the same as that of the eleventh sub-resonant current. The mode of the tenth sub-resonant current is a 1 / 4 wavelength mode of the sixth frequency band. The distance between the feed point C and the second end D is about 1 / 4 wavelength of the sixth frequency band.

[0135] The sixth resonant mode is a mouth-to-mouth antenna radiation mode.

[0136] Please refer to Figure 17 The first radiator 10 and the second radiator 20 also form a seventh resonant mode supporting a seventh frequency band under the excitation of the signal source 30. The resonant current of the seventh resonant mode includes a twelfth sub-resonant current formed between the feed point C and the second end D, and a thirteenth sub-resonant current between the third end E and the fourth end F. The resonant current of the seventh resonant mode flows from the feed point C to the second end D, and then from the fourth end F to the third end E. Due to the periodicity of the current, the resonant current of the sixth resonant mode can be opposite to the above current.

[0137] The current intensity of the thirteenth sub-resonant current is greater than that of the twelfth sub-resonant current. The part of the seventh resonant mode between the third end E and the fourth end F is the main mode, which mainly contributes to the radiation. The current direction of the thirteenth sub-resonant current is the same as that of the twelfth sub-resonant current. The mode of the thirteenth sub-resonant current is a 1 / 4 wavelength mode of the seventh frequency band. The distance between the third end E and the fourth end F is about 1 / 4 wavelength of the seventh frequency band.

[0138] The seventh resonant mode is a balanced mode of the mouth-to-mouth antenna.

[0139] The sixth resonant mode and the seventh resonant mode form a set of radiation modes and balanced modes of the mouth-to-mouth antenna. The sixth resonant mode is also called a high mode radiation mode. The seventh resonant mode is also called a high mode balanced mode. Generally, after the high mode radiation mode and the high mode balanced mode are generated in the antenna assembly 100, the efficiency is improved, thereby improving the wave boost in the antenna band.

[0140] When the sixth frequency band and the seventh frequency band are close (for example, less than 1 GHz), the sixth frequency band and the seventh frequency band form a continuous frequency band, have a good bandwidth, and have a good efficiency bandwidth.

[0141] In the embodiment, the center frequency of the sixth frequency band is 2.5 GHz, and the sixth frequency band is an effective frequency band in which the return loss corresponding to the sixth resonant mode is less than -3 dB, or less than -4 dB, or less than -5 dB. In the embodiment, the sixth frequency band is 2-2.7 GHz, which can effectively cover the B40 frequency band and the B41 frequency band.

[0142] The center frequency point of the fifth frequency band is less than the center frequency point of the sixth frequency band. The center frequency point of the sixth frequency band is less than the center frequency point of the seventh frequency band. The fifth frequency band, the sixth frequency band, and the seventh frequency band form a continuous frequency band capable of covering a bandwidth greater than or equal to 1 GHz.

[0143] The electrical length between the connection point B and the first end A on the first radiator 10 is greater than the electrical length between the connection point B and the second end D, and the electrical length between the connection point B and the second end D is greater than the electrical length between the third end E and the fourth end F.

[0144] Since the seventh resonant mode is a balanced mode of the mouth-to-mouth antenna, an efficiency pit is generated after the balanced mode of the mouth-to-mouth antenna. Therefore, by designing the relationship between the electrical length between the connection point B and the first end A, the electrical length between the connection point B and the second end D, and the electrical length between the third end E and the fourth end F on the first radiator 10, the fifth frequency band is less than the sixth frequency band, so as to improve the in-band efficiency of the antenna assembly 100.

[0145] In the embodiment, the distance between the feeding point C and the first end A is (1 / 4-1 / 2) of the total length of the first radiator 10.

[0146] For example, the distance between the first connection point BA and the second connection point BB is greater than or equal to 1 / 16 wavelength and less than 1 / 8 wavelength when the total length of the first radiator 10 is 1 / 4 wavelength.

[0147] When the distance between the first connection point BA and the second connection point BB is less than 1 / 16 wavelength, i.e. the distance between the feed point C and the first end A is 1 / 4 of the total length of the first radiator 10, the antenna assembly 100 forms an IFA mode, and cannot generate two resonance modes.

[0148] When the distance between the first connection point BA and the second connection point BB is greater than or equal to 1 / 16 wavelength and less than or equal to 1 / 8 wavelength, i.e. the distance between the feed point C and the first end A is (1 / 4-1 / 2) of the total length of the first radiator 10, the IFA mode splits into two modes, one of which is a 1 / 4 wavelength mode from the first end A to the second end D (i.e. the fifth resonance mode), and the other is a 1 / 4 wavelength mode from the feed point C to the second end D (i.e. the sixth resonance mode in the portion between the feed point C and the second end D). In this embodiment, the distance between the feed point C and the first end A is (1 / 4-1 / 2) of the total length of the first radiator 10, so as to facilitate the generation of two resonance modes on the IFA antenna.

[0149] In this embodiment, at least one of the first switch circuit 40 and the second switch circuit 50 further comprises a tuning circuit. One end of the tuning circuit is electrically connected to the first end A. The other end of the tuning circuit is grounded. The tuning circuit is used to switch a sub-band in the frequency band supported by the antenna assembly 100, so that the antenna assembly 100 can support more frequency bands.

[0150] Optionally, referring to Figure 18 and Figure 19 , the antenna assembly 100 further comprises a first tuning circuit T1. The first tuning circuit T1 is arranged on a circuit board (main board). The first tuning circuit T1 further comprises a plurality of first tuning branches T11. Each of the first tuning branches T11 has a different impedance value. One end of each of the first tuning branches T11 is electrically connected to one end of a first switch unit K1, and the other end of the first switch unit K1 is electrically connected to the connection point B. The other end of each of the first tuning branches T11 is grounded. For example, the plurality of first tuning branches T11 are a plurality of capacitor devices with different capacitance values. Alternatively, the plurality of first tuning branches T11 are a plurality of inductor devices with different inductance values. Alternatively, the plurality of first tuning branches T11 include a plurality of capacitor devices with different capacitance values and a plurality of inductor devices with different inductance values. By adjusting the first switch unit K1 to be electrically connected to different devices, the equivalent electrical length of the first tuning branch T11 electrically connected to the first radiator 10 is adjusted, and the sub-band supported by the antenna assembly 100 is switched. Of course, the first tuning branch T11 can include an adjustable capacitor.

[0151] The first tuning circuit T1 is used to switch the frequency band supported by the antenna assembly 100 in the first working mode.

[0152] Optionally, referring to Figure 20 and Figure 21 , the antenna assembly 100 further comprises a second tuning circuit T2. The second tuning circuit T2 is arranged on the circuit board (main board). The second tuning circuit T2 further comprises a plurality of second tuning branches T12. Each of the second tuning branches T12 has a different impedance value. One end of each of the second tuning branches T12 is electrically connected to one end of a second switch unit K2, and the other end of the second switch unit K2 is electrically connected to the first end A. The other end of each of the second tuning branches T12 is grounded. For example, the plurality of second tuning branches T12 are a plurality of capacitor devices with different capacitance values. Alternatively, the plurality of second tuning branches T12 are a plurality of inductor devices with different inductance values. Alternatively, the plurality of second tuning branches T12 include a plurality of capacitor devices with different capacitance values and a plurality of inductor devices with different inductance values. By adjusting the second switch unit K2 to be electrically connected to different devices, the equivalent electrical length of the second tuning branch T12 electrically connected to the first radiator 10 is adjusted, thereby switching the sub-frequency band supported by the antenna assembly 100. Of course, the second tuning branch T12 can include an adjustable capacitor.

[0153] The second tuning circuit T2 is used to switch the frequency band supported by the antenna assembly 100 in the second working mode.

[0154] The present application does not limit the position of the antenna assembly 100 on the electronic device 1000. Optionally, the antenna assembly 100 can be arranged on the top edge 321, or the bottom edge 322, or the first side edge 323, or the second side edge 324, or two adjacent edges intersecting the frame 320 of the electronic device 1000.

[0155] When the antenna assembly 100 is arranged on the bottom edge 322, the main branch and the parasitic branch of the current concentration are both located on the bottom edge 322, and the current intensity is large, especially in the N41 frequency band (N41 frequency band base station duty cycle is high, N41 signal energy is large), the bottom edge 322 has serious SAR. In addition, there are different degrees of SAR in other MHB frequency bands, so in actual use, the SAR is reduced by 2-3 dB, so the performance after the reduction is not high in the actual scenario, and therefore how to balance the performance and low SAR while reducing the cost becomes a technical problem to be solved.

[0156] The first radiator 10 comprises a first radiation section 11 and a second radiation section 12 connected to each other. The first radiation section 11 and the second radiation section 12 are arranged on two adjacent connecting edges (for example Figure 3The first radiator 10 is arranged on the two adjacent edges of the bezel 320. The SAR hot spot generated by the first radiator 10 when transmitting and receiving electromagnetic wave signals is distributed to the two adjacent edges, i.e., the edge of the bezel 320 on which the first radiation section 11 is located and the edge of the bezel 320 on which the second radiation section 12 is located.

[0157] In the embodiment, the first radiator 10 is arranged on the two adjacent edges of the bezel 320. The current of the horizontal branch and the vertical branch is balanced by the two adjacent edges, the SAR value of the bottom edge 322 is reduced, and the SAR value of the MHB frequency band is greatly reduced.

[0158] For example, when the antenna assembly 100 is arranged on the bottom edge 322 of the electronic device 1000, the SAR value of the antenna assembly 100 on the bottom edge 322 is 20. When the antenna assembly 100 is arranged on the two adjacent edges of the intersection of the bottom edge 322 and the first side edge 323, the SAR value of the antenna assembly 100 on the bottom edge 322 is 16, and the SAR value of the antenna assembly 100 on the first side edge 323 is 5. Since the SAR value of the antenna assembly 100 on the first side edge 323 is much smaller than the SAR value on the bottom edge 322, when the SAR value is calculated, the SAR value 5 of the first side edge 323 can not be considered, and only the SAR value 16 of the reference antenna assembly 100 on the bottom edge 322 is considered. Thus, compared with the original SAR value 20, the SAR value of the MHB frequency band is greatly reduced.

[0159] On the other hand, the antenna assembly 100 in the embodiment includes at least the first radiator 10 and the second radiator 20. The length of the radiator of the antenna assembly 100 is relatively long, the current path of the radiator on the antenna assembly 100 is long, and thus the current amplitude on the radiator of the antenna assembly 100 is reduced, the current intensity concentration is reduced, and the SAR value of the antenna assembly 100 is reduced.

[0160] The electronic device 1000 further includes a reference ground plate 60. The reference ground plate 60 is arranged in the bezel 320. The reference ground plate 60 has a connection point between the two adjacent edges of the bezel 320. The first switch circuit 40 electrically connects the position of the reference ground plate 60 and the connection point between the two adjacent edges of the reference ground plate 60, and the distance between the two positions is less than 1 / 8 wavelength corresponding to the frequency band supported by the antenna assembly 100.

[0161] The position of the reference ground plate 60 electrically connected by the first switch circuit 40 is a ground return position. For example, when the frequency band supported by the antenna assembly 100 is 1.5-2.8 GHz, the distance between the position of the reference ground plate 60 electrically connected by the first switch circuit 40 and the connection point between the two adjacent edges of the reference ground plate 60 is less than 1 / 8 wavelength corresponding to 1.5-2.8 GHz.

[0162] Since the grounding position and the feeding position of the first radiator 10 are both located near the connection point between the two adjacent edges intersecting the reference floor 60, under the excitation of the signal source 30, the floor current is formed on the reference floor 60, the floor current flows from the far field to the grounding position of the antenna assembly 100 and converges at the grounding position of the antenna assembly 100, and then flows to the first radiator 10 through the grounding position of the antenna assembly 100. Since the antenna assembly 100 is grounded near the connection point between the two adjacent edges intersecting the reference floor 60, when the reference floor 60 participates in radiation, the transverse current along the transverse edge and the longitudinal current along the longitudinal edge are generated on the reference floor 60, the flow directions of the transverse current and the longitudinal current are both towards the connection point between the two adjacent edges intersecting the reference floor 60, and since the transverse current intersects the longitudinal current, even nearly vertically, the mutual cancellation between the transverse current and the longitudinal current is less.

[0163] If the grounding position of the first radiator 10 is located far from the connection point between the two adjacent edges intersecting the reference floor 60 along the longitudinal edge, the reverse current is generated along the longitudinal edge, the far field energy of the part of the reverse current can be mutually cancelled, and thus the radiation efficiency is reduced.

[0164] Specifically, the length of the transverse edge is less than the length of the longitudinal edge. When the antenna assembly 100 is grounded at the connection point between the two adjacent edges intersecting the reference floor 60, the maximum angle between the floor currents on the reference floor 60 is about 90°. That is, the transverse current along the transverse edge and the longitudinal current along the longitudinal edge are the current with the maximum angle, no reverse current is generated, the contribution efficiency of the reference floor 60 is improved, and thus the radiation efficiency of the antenna assembly 100 is improved.

[0165] Referring to Figure 3 , Figure 3 is a structural schematic view of the antenna assembly 100 provided by the first embodiment of the present application in the first working mode, which is arranged at the bottom edge 322 and the second side edge 324 of the electronic device 1000. Part of the first radiator 10 is arranged at the bottom edge 322 of the electronic device 1000, and the other part of the first radiator 10 is arranged at the second side edge 324 of the electronic device 1000. The second radiator 20 is entirely arranged at the bottom edge 322 of the electronic device 1000. The antenna assembly 100 generates at least three resonance modes, and the three resonance modes are respectively a first resonance mode, a second resonance mode and a third resonance mode.

[0166] Referring to Figure 22 , Figure 22 is Figure 3 the S parameter and efficiency curve of the antenna assembly 100 shown in FIG. 8. In the figure, curve a is the S parameter of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the total efficiency curve of the antenna assembly 100.

[0167] FromFigure 22 As can be seen from the S parameter curve in FIG. 8, point 1 of the curve a corresponds to the resonance frequency point of the first resonance mode, point 2 of the curve a corresponds to the resonance frequency point of the second resonance mode, and point 3 of the curve a corresponds to the resonance frequency point of the third resonance mode. As can be seen from the curve a, the frequency point of the radiation mode of the T-shaped antenna is pulled apart from the frequency point of the balanced mode during the tuning of the first matching circuit M1, for example, the frequency point of the balanced mode of the T-shaped antenna is located behind the efficiency notch of the T-shaped antenna. The efficiency notch of the T-shaped antenna has little reduction in efficiency, which does not affect the in-band efficiency of the T-shaped antenna. After the frequency point of the radiation mode of the T-shaped antenna is pulled apart from the frequency point of the balanced mode, the resonance frequency points of the three resonance modes form a wide frequency band.

[0168] Table 1-1 is the efficiency of the antenna assembly 100 in the B3 frequency band, the B1 frequency band, the B40 frequency band and the B41 frequency band when the antenna assembly 100 is arranged on the bottom edge 322 of the electronic device 1000 in the prior art scheme, and the efficiency of the antenna assembly 100 in the B3 frequency band, the B1 frequency band, the B40 frequency band and the B41 frequency band when the antenna assembly 100 is arranged on the two adjacent edges intersecting the bottom edge 322 and the second side edge 324 of the electronic device 1000 in the embodiment.

[0169] Table 1-1

[0170]

[0171] Table 1-2 is the efficiency corresponding to the power backoff in the B3 frequency band, the B1 frequency band, the B40 frequency band and the B41 frequency band after the antenna assembly 100 detects the SAR value of the bottom edge 322 in the prior art scheme, and the efficiency corresponding to the power backoff in the B3 frequency band, the B1 frequency band, the B40 frequency band and the B41 frequency band after the antenna assembly 100 detects the SAR value of the bottom edge 322 in the embodiment.

[0172] Table 1-2

[0173]

[0174] In the embodiment, the B3 and B1 are in the frequency division duplex (FDD) mode, the base station transmission power duty cycle is 100%, and the efficiency value avoiding SAR power backoff is the actual gain, which has very practical significance.

[0175] Table 1-3 is the efficiency of the antenna assembly 100 after power backoff in the prior art scheme, and the efficiency of the antenna assembly 100 after power backoff in the embodiment.

[0176] Table 1-3

[0177]

[0178] As shown in Tables 1-3, the efficiency of the conventional scheme in the B3 band after SAR detection and power back-off through the bottom edge 322 is -5.2 dB, while in the present embodiment, the SAR value of the B3 band at the bottom edge 322 is reduced due to the antenna assembly 100 being arranged at the intersection of the two adjacent edges between the bottom edge 322 and the second side edge 324, and the power back-off is less, so the efficiency of the present embodiment in the B3 band after SAR detection through the bottom edge 322 is -2.5 dB. Compared with the conventional scheme, the present embodiment has a gain in the B3 band. Similarly, the present embodiment has a gain in the B1 band. The antenna assembly 100 provided by the present embodiment also takes into account SAR reduction, and does not need to be provided with a switch to achieve CA state broadbandization, and has the advantages of improved actual performance after SAR back-off, etc.

[0179] Referring to Figure 23 , Figure 23 is a structural schematic diagram of the antenna assembly 100 provided by the second embodiment of the present application arranged at the bottom edge 322 and the second side edge 324 of the electronic device 1000. Part of the first radiator 10 is arranged at the bottom edge 322 of the electronic device 1000, and another part of the first radiator 10 is arranged at the second side edge 324 of the electronic device 1000. The second radiator 20 is entirely arranged at the bottom edge 322 of the electronic device 1000. The third radiator 80 is entirely arranged at the second side edge 324. The antenna assembly 100 generates at least four resonance modes, and the four resonance modes are respectively the first resonance mode, the fourth resonance mode, the second resonance mode, and the third resonance mode.

[0180] Referring to Figure 24 , Figure 24 is the S parameter and efficiency curve of the antenna assembly 100 shown in Figure 23 . Among them, curve a is the S parameter of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the total efficiency curve of the antenna assembly 100.

[0181] From Figure 24As can be seen from the S-parameter curves, point 1 on curve a corresponds to the resonant frequency of the first resonant mode, point 2 on curve a corresponds to the resonant frequency of the fourth resonant mode, point 3 on curve a corresponds to the resonant frequency of the second resonant mode, and point 4 on curve a corresponds to the resonant frequency of the third resonant mode. From curve a, it can be seen that the frequency of the radiating mode of the T-shaped antenna (point 1) and the frequency of the balanced mode (point 2) are separated during the tuning process of the first matching circuit M1. For example, the frequency of the balanced mode of the T-shaped antenna (point 2) is located after the efficiency dip of the T-shaped antenna (efficiency corresponding to 1.9 GHz). Since the efficiency drop in the efficiency dip of the T-shaped antenna is small, the efficiency dip does not affect the in-band efficiency of the T-shaped antenna. After the frequency of the radiating mode of the T-shaped antenna is separated from the frequency of the balanced mode, the resonant frequencies of the four resonant modes form a relatively wide bandwidth. It can be seen that at this time, the antenna assembly 100 satisfies the MHB CA state without switching and also has high efficiency.

[0182] Please refer to Table 2-1. Table 2-1 shows the efficiency of the antenna assembly 100 in the B3, B1, B40, and B41 frequency bands when the antenna assembly 100 is located on the bottom edge 322 of the electronic device 1000 in the conventional scheme, and the efficiency of the antenna assembly 100 in the B3, B1, B40, and B41 frequency bands when the antenna assembly 100 is located on the two adjacent sides of the intersection of the bottom edge 322 and the second side edge 324 of the electronic device 1000 in this embodiment.

[0183] Table 2-1

[0184]

[0185]

[0186] Please see Figure 25 Taking the B3 band as an example, the SAR hotspot comparison distribution of the antenna assembly 100 in this embodiment is as follows: Figure 25 As shown. Compared to traditional solutions, in any MHB frequency band, the current is distributed in both the horizontal and vertical segments. SAR hotspots generate SAR hotspots at both the bottom edge 322 (the dashed box corresponding to the bottom edge 322) and the second side 324 (the dashed box corresponding to the second side 324), thus reducing the SAR at the bottom edge 322. The SAR at the second side 324 is inherently low; the highest SAR surface is at the bottom edge 322. After diverting current to the second side 324, the highest SAR surface remains at the bottom edge 322, and other surfaces do not have a risk of exceeding SAR. Therefore, the main focus here is still on reducing the SAR at the bottom edge 322. In this embodiment, by moving a portion of the current from the bottom edge 322 to the second side 324—in other words, introducing a corner SAR hotspot—the original SAR value at the bottom edge 322 is reduced.

[0187] In terms of the current path, the overall current in this embodiment is 3 / 4 wavelength mode of the frequency band supported by the antenna assembly 100. Compared with the 1 / 2 wavelength mode corresponding to the supported frequency band in the conventional scheme, the length of the radiator in this embodiment is longer, and the current intensity is reduced, so the SAR hotspot intensity is also reduced, and the required power backoff is reduced.

[0188] Table 2-2 is the efficiency corresponding to the power backoff of the antenna assembly 100 in the conventional scheme after detecting the SAR value of the bottom edge 322 in the B3 frequency band, the B1 frequency band, the B40 frequency band and the B41 frequency band, and the efficiency corresponding to the power backoff of the antenna assembly 100 in this embodiment after detecting the SAR value of the bottom edge 322 in the B3 frequency band, the B1 frequency band, the B40 frequency band and the B41 frequency band.

[0189] Table 2-2

[0190]

[0191] Wherein, the system of B3 and B1 is frequency division duplex system (FDD), the duty cycle of base station transmit power is 100%, and the efficiency value of avoiding SAR power backoff is actual benefit, which has very practical significance.

[0192] Table 2-3 is the efficiency of the antenna assembly 100 after power backoff in the conventional scheme and the efficiency of the antenna assembly 100 after power backoff in this embodiment.

[0193] Table 2-3

[0194]

[0195] As can be seen from Table 2-3, the efficiency of the conventional scheme in the B3 frequency band after SAR detection and power backoff of the bottom edge 322 is-5.2dB, while in this embodiment, the SAR value of the B3 frequency band at the bottom edge 322 is reduced by arranging the antenna assembly 100 between the two adjacent edges intersecting the bottom edge 322 and the second side edge 324, and the power backoff is less. Therefore, the efficiency of this embodiment in the B3 frequency band after SAR detection of the bottom edge 322 is-3.8dB. Compared with the conventional scheme, the present embodiment has a benefit in the B3 frequency band. Similarly, the present embodiment has a benefit in the B1 and B41 frequency bands. After adopting the low SAR design, the actual performance of the present embodiment is improved compared with the conventional scheme. In the MHB frequency band, the SAR is not reduced or is greatly reduced, and the actual use performance of the user is improved.

[0196] Table 2-3 is the efficiency of the antenna assembly 100 after power backoff in the conventional scheme and the efficiency of the antenna assembly 100 after power backoff in this embodiment. Figure 26 , Figure 26This is a schematic diagram of the antenna assembly 100 provided in the first embodiment of this application, disposed on the bottom edge 322 of the electronic device 1000 in a second operating mode. The first radiator 10 and the second radiator 20 are both disposed on the bottom edge 322 of the electronic device 1000. The antenna assembly 100 generates at least three resonant modes, namely the fifth resonant mode, the sixth resonant mode, and the seventh resonant mode. Alternatively, the antenna assembly 100 can also be disposed on the two adjacent sides where the bottom edge 322 intersects with the second side edge 324.

[0197] Please see Figure 24 , Figure 24 yes Figure 26 The S-parameters and efficiency curves of the antenna assembly 100 are shown. Curve a represents the S-parameters of the antenna assembly 100. Curve b represents the radiation efficiency curve of the antenna assembly 100. Curve c represents the overall efficiency curve of the antenna assembly 100.

[0198] from Figure 24 As can be seen from the S-parameter curves, point 1 on curve a corresponds to the resonant frequency of the fifth resonant mode, point 2 on curve a corresponds to the resonant frequency of the sixth resonant mode, and point 3 on curve a corresponds to the resonant frequency of the seventh resonant mode. Curve a shows that the resonant frequencies of the fifth and sixth resonant modes are quite far apart, and the fifth and sixth frequency bands form a continuous and relatively wide frequency band.

[0199] The antenna assembly 100 provided in this application embodiment can generate MHB CA states such as B3+B1+B39+B40+B41 without the need for a switching switch, saving costs. It utilizes a metal insert process to add gaps and introduce parasitic stubs without affecting the appearance. In the first operating mode, the feed point C and return point of the antenna assembly 100 are both located at the connection point between two intersecting adjacent sides on the reference ground plane 60. A large current returns to ground through this connection point, improving efficiency. The overall stub configuration is a corner T+double L stub configuration, using the corner to balance the current in the lateral and longitudinal stubs, significantly reducing the MHB SAR value, achieving a low SAR design, and improving the actual performance for users.

[0200] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. An electronic device, comprising: The antenna assembly comprises: a first radiator comprising a first end and a second end arranged oppositely, and a connection point and a feed point arranged between the first end and the second end; a signal source electrically connected to the feed point; a second radiator comprising a third end and a fourth end arranged oppositely, the third end being coupled to the second end through a gap, and the fourth end being grounded; a first switch circuit having one end electrically connected to the connection point and the other end grounded; and a second switch circuit having one end electrically connected to the first end and the other end grounded. The antenna assembly has a first operating mode and a second operating mode, in the first operating mode, the first switch circuit is in a conducting state and the second switch circuit is in a non-conducting state, and in the second operating mode, the first switch circuit is in a non-conducting state and the second switch circuit is in a conducting state.

2. The electronic device of claim 1, wherein, The electronic device further comprises a proximity detector electrically connected to the antenna assembly, and the antenna assembly is configured to switch to the second operating mode when the proximity detector detects that a subject to be detected approaches the first end of the first radiator.

3. The electronic device of claim 1, wherein, The antenna assembly can cover a target frequency band in both the first operating mode and the second operating mode, and the bandwidth of the target frequency band is greater than or equal to 1 GHz.

4. The electronic device of claim 1, wherein, In the first operating mode or the second operating mode, the first radiator and the second radiator form at least three resonant modes under the excitation of the signal source.

5. The electronic device of claim 4, wherein, In the first operating mode, the first radiator and the second radiator form a first resonant mode supporting a first frequency band under the excitation of the signal source, the resonant current of the first resonant mode comprises a first sub-resonant current formed between the first end and the connection point and a second sub-resonant current formed between the second end and the connection point, the current intensity of the first sub-resonant current is greater than that of the second sub-resonant current, the mode of the first sub-resonant current is a 1 / 4 wavelength mode of the first frequency band, and the directions of the first sub-resonant current and the second sub-resonant current are opposite.

6. The electronic device of claim 5, wherein, The first radiator and the second radiator also form a second resonant mode supporting a second frequency band under the excitation of the signal source, the resonant current of the second resonant mode comprises a third sub-resonant current formed between the first end and the second end and a fourth sub-resonant current formed between the third end and the fourth end, the current intensity of the third sub-resonant current between the connection point and the second end is greater than that of the third sub-resonant current between the connection point and the first end, the current intensity of the third sub-resonant current between the connection point and the second end is greater than that of the fourth sub-resonant current, the mode of the third sub-resonant current is a 1 / 2 wavelength mode of the second frequency band, and the directions of the third sub-resonant current and the fourth sub-resonant current are the same.

7. The electronic device of claim 6, wherein, The first radiator and the second radiator also form a third resonant mode supporting a third frequency band under the excitation of the signal source, a resonant current of the third resonant mode includes a fifth sub-resonant current formed between the first end and the second end and a sixth sub-resonant current formed between the third end and the fourth end, a current intensity of the sixth sub-resonant current is greater than a current intensity of the fifth sub-resonant current, a mode of the sixth resonant current is a 1 / 4 wavelength mode of the third frequency band, and directions of the fifth sub-resonant current and the sixth sub-resonant current are opposite.

8. The electronic device of claim 7, wherein, A center frequency point of the first frequency band is less than a center frequency point of the second frequency band, and the center frequency point of the second frequency band is less than a center frequency point of the third frequency band, and the first frequency band, the second frequency band and the third frequency band form a continuous frequency band capable of covering a bandwidth greater than or equal to 1 GHz.

9. The electronic device of claim 6, wherein, The antenna assembly further includes a third radiator including a fifth end and a sixth end arranged oppositely, and the sixth end is grounded, and the fifth end and the first end are coupled through a gap in the first operating mode.

10. The electronic device of claim 9, wherein, The first radiator and the third radiator also form a fourth resonant mode supporting a fourth frequency band under the excitation of the signal source, a resonant current of the fourth resonant mode includes a seventh sub-resonant current formed between the first end and the second end and an eighth sub-resonant current formed between the fifth end and the sixth end, a current intensity of the eighth sub-resonant current is greater than a current intensity of the seventh sub-resonant current, a mode of the eighth resonant current is a 1 / 4 wavelength mode of the fourth frequency band, and directions of the seventh sub-resonant current and the eighth sub-resonant current are the same.

11. The electronic device of claim 10, wherein, The center frequency point of the fourth frequency band is greater than the center frequency point of the first frequency band, and the center frequency point of the fourth frequency band is less than the center frequency point of the third frequency band.

12. The electronic device of claim 4, wherein, In the second operating mode, the first radiator and the second radiator form a fifth resonant mode supporting a fifth frequency band under the excitation of the signal source, and a resonant current of the fifth resonant mode includes a ninth sub-resonant current formed between the first end and the second end, and a mode of the ninth sub-resonant current is a 1 / 4 wavelength mode of the fifth frequency band.

13. The electronic device of claim 12, wherein, The second switch circuit includes a switch unit and a capacitor, one end of the switch unit is electrically connected to the first end, the other end of the switch unit is electrically connected to one end of the capacitor, and the other end of the capacitor is grounded.

14. The electronic device of claim 13, wherein, The first radiator and the second radiator also form a sixth resonant mode supporting a sixth frequency band under the excitation of the signal source, a resonant current of the sixth resonant mode includes a tenth sub-resonant current formed between the feed point and the second end and an eleventh sub-resonant current formed between the third end and the fourth end, a current intensity of the tenth sub-resonant current is greater than a current intensity of the eleventh sub-resonant current, a current direction of the tenth sub-resonant current is the same as a current direction of the eleventh sub-resonant current, and a mode of the tenth sub-resonant current is a 1 / 4 wavelength mode of the sixth frequency band.

15. The electronic device of claim 14, wherein, The first radiator and the second radiator also form a seventh resonant mode supporting a seventh frequency band under the excitation of the signal source, a resonant current of the seventh resonant mode includes a twelfth sub-resonant current formed between the feed point and the second end, and a thirteenth sub-resonant current between the third end and the fourth end, the thirteenth sub-resonant current has a current intensity greater than that of the twelfth sub-resonant current, the thirteenth sub-resonant current has a same current direction as the twelfth sub-resonant current, and the thirteenth sub-resonant current has a 1 / 4 wavelength mode of the seventh frequency band.

16. The electronic device of claim 15, wherein, The fifth frequency band has a center frequency point less than that of the sixth frequency band, and the sixth frequency band has a center frequency point less than that of the seventh frequency band, and the fifth frequency band, the sixth frequency band and the seventh frequency band form a continuous frequency band capable of covering a bandwidth greater than or equal to 1 GHz.

17. The electronic device of claim 12, wherein, A distance between the feed point and the first end is (1 / 4-1 / 2) of a total length of the first radiator.

18. The electronic device of any of claims 1-17, wherein, The electronic device further includes a bezel, the first radiator further includes a first radiation segment and a second radiation segment connected to each other, the first radiation segment and the second radiation segment are respectively arranged on two adjacent connecting edges of the bezel, and a SAR hotspot generated by the first radiator when transmitting and receiving electromagnetic wave signals is distributed to sides on which the two connecting edges are located.

19. The electronic device of any of claims 1-17, wherein, The electronic device further includes a reference floor, a distance between a position of the reference floor electrically connected to the first switch circuit and a connecting point of two adjacent edges of the reference floor is less than 1 / 8 wavelength corresponding to a frequency band supported by the antenna assembly.

20. The electronic device of any of claims 1-17, wherein, At least one of the first switch circuit and the second switch circuit further includes a tuning circuit, one end of the tuning circuit is electrically connected to the first end, and the other end of the tuning circuit is grounded, and the tuning circuit is used to switch a sub-frequency band in the frequency bands supported by the antenna assembly.

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