Antenna assembly and electronic device

Abstract

The application provides an antenna assembly, a main radiator comprising a first free end, a second free end, a feed point and a tuning point; a parasitic radiator comprising a third free end and a first grounding point, the third free end and the second free end being a coupling gap; a signal source being electrically connected to the feed point, the signal source being used to excite a first resonance mode on the main radiator to support a first frequency band, and the signal source being used to excite a second resonance mode on the parasitic radiator to support a second frequency band and to excite a target high-order mode on the main radiator to support the second frequency band, the target high-order mode and the second resonance mode together forming a double-wave resonance to support the second frequency band; one end of a switch switching circuit being electrically connected to the tuning point, and the other end being grounded; the switch switching circuit being used to switch a sub-frequency band of the first frequency band, and the second frequency band supported by the second resonance mode and the target high-order mode remaining constant when the sub-frequency band of the first frequency band is switched. The application can improve the performance of the antenna and save the occupied space.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to an antenna assembly and electronic device. Background Technology

[0002] With the development of network technology, the demand for high-speed data transmission is increasing. Space on electronic devices is limited, while the ever-increasing functionality of antennas necessitates a growing number of antennas. Therefore, improving antenna performance while saving space has become a crucial technical challenge. Summary of the Invention

[0003] This application provides an antenna assembly that improves antenna performance and saves space, as well as an electronic device having the antenna assembly.

[0004] This application provides an antenna assembly, including:

[0005] The main radiator includes a first free end and a second free end arranged opposite to each other, as well as a feed point and a tuning point located between the first free end and the second free end;

[0006] A parasitic radiator, comprising a third free end and a first grounding point, wherein the third free end and the second free end are connected by a coupling gap, and the first grounding point is used for grounding;

[0007] A signal source, electrically connected to the feed point, is used to excite the main radiator to form a first resonant mode supporting a first frequency band. The signal source is also used to excite the parasitic radiator to form a second resonant mode supporting a second frequency band and to excite the main radiator to form a target higher-order mode supporting the second frequency band. The target higher-order mode and the second resonant mode together form a dual-wave resonance supporting the second frequency band.

[0008] A switching circuit is provided, one end of which is electrically connected to the tuning point and the other end is grounded. The switching circuit is used to switch the sub-band of the first frequency band. The second resonant mode and the second frequency band supported by the target higher-order mode remain stationary when switching the sub-band of the first frequency band.

[0009] The antenna assembly provided in this application embodiment is designed with a main radiator including a first free end and a second free end arranged opposite to each other, and a feed point and a tuning point located between the first free end and the second free end. The parasitic radiator includes a third free end and a first grounding point. A coupling gap exists between the third free end and the second free end, and the parasitic radiator is coupled to the main radiator. The first grounding point is used for grounding. A signal source is used to excite the main radiator to form a first resonant mode supporting a first frequency band. The signal source is also used to excite the parasitic radiator to form a second resonant mode supporting a second frequency band and a target higher-order mode. Together with the second resonant mode, a dual-wave resonance supporting the second frequency band is formed. One end of the switching circuit is electrically connected to the tuning point, and the other end is grounded. The switching circuit is used to switch the sub-bands of the first frequency band and keep the second resonant mode and the second frequency band supported by the target higher-order mode constantly active. The above design enables the antenna component to support both the first and second frequency bands simultaneously. Furthermore, by designing the second frequency band to form a dual-wave resonance, the efficiency of the second frequency band is improved. By setting the switching circuit, the sub-band switching in the first frequency band is realized, and the second frequency band remains active when the sub-bands of the first frequency band are switched, thereby improving antenna performance and saving space. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0011] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0012] Figure 2 This is a partially exploded structural diagram of an electronic device provided in an embodiment of this application;

[0013] Figure 3 This is a partial rear view of an electronic device provided in an embodiment of this application;

[0014] Figure 4 This is a schematic diagram of the structure of an antenna assembly provided in an embodiment of this application;

[0015] Figure 5 This is a schematic diagram of the first sub-current and second sub-current distribution of a first sub-mode of an antenna assembly provided in an embodiment of this application;

[0016] Figure 6 This is a schematic diagram of the resonant current distribution of a second sub-mode of an antenna assembly provided in an embodiment of this application;

[0017] Figure 7 This is a schematic diagram of the resonant current distribution of a second resonant mode of an antenna assembly provided in an embodiment of this application;

[0018] Figure 8 This is a schematic diagram of the resonant current distribution of a higher-order mode of an antenna assembly provided in an embodiment of this application;

[0019] Figure 9 This is a schematic diagram of the first configuration structure of a switching circuit for an antenna assembly provided in an embodiment of this application;

[0020] Figure 10 This is a schematic diagram of the first configuration structure of a switching circuit for an antenna assembly provided in an embodiment of this application;

[0021] Figure 11 This is a schematic diagram of the switch switching circuit provided in the embodiment of this application;

[0022] Figure 12 This is a schematic diagram of an example of a switch switching circuit provided in an embodiment of this application;

[0023] Figure 13 This is an S-parameter curve of the antenna assembly 100 provided in this application embodiment switching between the B5 band, B8 band, B20 band, and B28 band;

[0024] Figure 14 This is an efficiency diagram of the antenna assembly 100 provided in this application embodiment switching between the B5 band, B8 band, B20 band, and B28 band;

[0025] Figure 15 This is a partial rear view of an electronic device having a first antenna unit to a fourth antenna unit provided in an embodiment of this application;

[0026] Figure 16 This is a partial rear view of an electronic device provided in an embodiment of this application, which has a first antenna unit to a sixth antenna unit. Detailed Implementation

[0027] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0028] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0029] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0030] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of this application. The electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablets, laptops, computers, wearable devices, drones, robots, and digital cameras. This embodiment uses a mobile phone as an example for illustration; other electronic devices can refer to this embodiment.

[0031] Please see Figure 2 , Figure 2 This is a partially exploded view of electronic device 1000. The electronic device 1000 includes an antenna assembly 100. Taking a mobile phone as an example, the working environment of the antenna assembly 100 is illustrated. The electronic device 1000 includes a display screen 200, a mid-frame 300, and a back cover 400 arranged sequentially along its thickness. The mid-frame 300 includes a mid-plate 310 and a frame 320 surrounding the mid-plate 310. The frame 320 may be a conductive frame. Of course, in other embodiments, the electronic device 1000 may not have a mid-plate 310. The display screen 200, mid-plate 310, and back cover 400 are stacked sequentially, forming receiving spaces between the display screen 200 and the mid-plate 310, and between the mid-plate 310 and the back cover 400, to accommodate components such as the motherboard, camera module, receiver module, battery, and various sensors. 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, forming a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, while the frame 320 and the back cover 400 can be separate structures. The above describes the working environment of the antenna assembly 100 taking a mobile phone as an example, but the antenna assembly 100 of this application is not limited to the above working environment.

[0032] Please see Figure 3 , Figure 3The image shows the rear view of the electronic device 1000. The frame 320 includes a top edge 321 and a bottom edge 322 oppositely disposed, and a first side edge 323 and a second side edge 324 connecting the top edge 321 and the bottom edge 322. The top edge 321 is the side away from the ground when the user holds and uses the electronic device 1000 in portrait mode, and the bottom edge 322 is the side facing the ground when the user holds and uses the electronic device 1000 in portrait mode. The first side edge 323 is the left side when the user holds and uses the electronic device 1000 in portrait mode. The second side edge 324 is the right side when the user holds and uses the electronic device 1000 in portrait mode. Alternatively, the first side edge 323 can also be the right side when the user holds and uses the electronic device 1000, and the second side edge 324 can be the left side when the user holds and uses the electronic device 1000.

[0033] Please see Figure 2 The electronic device 1000 includes a reference ground plane 500. The reference ground plane 500 is generally rectangular in shape, and its reference ground edges include, but are not limited to, straight or regular edges. Various slots, holes, etc., are formed on the reference ground edges of the reference ground plane 500 as needed to accommodate components or avoid other structures in the mobile phone. The reference ground plane 500 includes, but is not limited to, the metal alloy portion of the middle plate 310 and the reference ground metal portion of the circuit board (including the main board 600 and the sub-board 700). Generally speaking, the reference ground system in the electronic device 1000 can be equivalent to a roughly rectangular shape, hence the name reference ground plane 500. However, the reference ground plane 500 does not indicate that the reference ground is plate-shaped or a rectangular plate. The outer contour of the reference ground plane 500 is close to the inner side of the frame 320.

[0034] Please see Figure 3 and Figure 4 The antenna assembly 100 includes a main radiator 10, a parasitic radiator 20, a signal source 30, and a switching circuit 50.

[0035] Both the main radiator 10 and the parasitic radiator 20 serve as ports for transmitting and receiving radio frequency (RF) signals in the antenna assembly 100. The RF signals are transmitted in the air medium as electromagnetic waves. This application does not specify the material of the main radiator 10 or the parasitic radiator 20. Optionally, the main radiator 10 may be made of a conductive material, including but not limited to conductive materials such as metals and alloys.

[0036] This application does not specifically limit the shape of the main radiator 10 or the parasitic radiator 20. For example, the shape of the main radiator 10 or the parasitic radiator 20 includes, but is not limited to, strip, sheet, rod, coating, film, etc. Figure 3The shapes of the main radiator 10 and parasitic radiator 20 shown are merely examples and do not limit the shapes of the main radiator 10 and parasitic radiator 20 provided in this application. In this embodiment, both the main radiator 10 and parasitic radiator 20 are strip-shaped. This application does not limit the extension trajectory of the main radiator 10. Optionally, the main radiator 10 can extend along a straight line, a curve, or a bend. In this embodiment, the main radiator 10 extends along a bend or similar trajectory. In other embodiments, the main radiator 10 is straight. The main radiator 10 described above can be a line of uniform width along its extension trajectory, or it can be a strip of varying width, such as one with a gradually changing width or a widened region.

[0037] This application does not specifically limit the form of the main radiator 10 and the parasitic radiator 20. Optionally, the form of the main radiator 10 and the parasitic radiator 20 includes, but is not limited to, a metal frame, a metal frame embedded in a plastic frame, a metal conductor located inside or on the surface of the frame 320, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser-directly formed antenna (LDS), a printed-directly formed antenna (PDS), a conductive sheet antenna (e.g., a metal bracket antenna), etc. This application will use the example where both the main radiator 10 and the parasitic radiator 20 are part of the frame 320.

[0038] Please see Figure 4 The main radiator 10 includes a first free end A, a tuning point B, a feed point C, and a second free end D arranged sequentially.

[0039] The first free end A is the end of the frame 320 after the first slit 41 is provided. The first slit 41 is filled with insulating material to insulate the first free end A from the frame 320 on the other side of the first slit 41 and to improve the overall structural strength of the frame 320.

[0040] The tuning point B is the position between the feed point C and the first free end A. This application does not specify its exact position.

[0041] The second free end D is one end of the frame 320 after the second slit 42 is provided. The second slit 42 is filled with insulating material to insulate the second free end D from the frame 320 on the other side of the second slit 42 and to improve the overall structural strength of the frame 320.

[0042] Please see Figure 4The parasitic radiator 20 includes a third free end E and a first grounding point F. A coupling gap, i.e., a first break 41, exists between the third free end E and the second free end D. The first grounding point F is used for grounding.

[0043] The third free end E is the other end of the frame 320 after the second slit 42 is provided. The second slit 42 is filled with insulating material to insulate the second free end D from the third free end E.

[0044] The first grounding point F is electrically connected to the reference ground 500. The electrical connection method includes, but is not limited to, a physical connection that is interconnected as a whole, or an indirect method through conductive springs, radio frequency connection lines, etc.

[0045] Please see Figure 4 The signal source 30 is electrically connected to the feed point C. The signal source 30 includes, but is not limited to, an RF transceiver chip. The signal source 30 is used to provide RF excitation current. After the RF excitation current is transmitted to the main radiator 10 and the parasitic radiator 20, it can excite the main radiator 10 and the parasitic radiator 20 to generate a resonant current, forming a resonant mode to support the frequency band corresponding to the resonant current.

[0046] In this embodiment, the signal source 30 is mounted on the motherboard 600. The electrical connection between the signal source 30 and the feed point C includes, but is not limited to, indirect methods such as via radio frequency connection lines or conductive springs. Specifically, the signal source 30 is electrically connected to the feed point C via a feed spring (conductive spring) mounted on the motherboard 600.

[0047] The signal source 30 is used to excite the main radiator 10 to form a first resonant mode supporting the first frequency band.

[0048] The signal source 30 is also used to excite the parasitic radiator 20 to form a second resonant mode supporting the second frequency band and to excite the main radiator 10 to form a target higher-order mode supporting the second frequency band. The target higher-order mode and the second resonant mode together form a dual-wave resonance supporting the second frequency band.

[0049] The second resonant mode is the ground state mode supporting the second frequency band. The effective frequency band supported by the second resonant mode and the effective frequency band supported by the target higher-order mode form a continuous frequency band. The effective frequency band supported by the second resonant mode is the frequency range corresponding to the second resonant mode in the S11 curve when the return loss is around -5dB (of course, it can also be -6dB, -7dB, -8dB, -9dB, -10dB, etc.). The effective frequency band supported by the target higher-order mode is the frequency range corresponding to the target higher-order mode in the S11 curve when the return loss is around -5dB (of course, it can also be -6dB, -7dB, -8dB, -9dB, -10dB, etc.).

[0050] This application does not specifically limit the first and second frequency bands. The first and second frequency bands are different frequency bands. Both the first and second frequency bands are at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, GPS band, etc. The first and second frequency bands can be 4G or 5G bands. For example, the first frequency band is an LB band, and the second frequency band is the N41 band of the MHB band. As another example, the first frequency band is an LB band, and the second frequency band is the Wi-Fi 2.4G band.

[0051] Please see Figure 4 One end of the switching circuit 50 is electrically connected to the tuning point B, and the other end is electrically connected to the reference ground 500. The switching circuit 50 is used to switch sub-bands of the first frequency band by changing the electrical length of the main radiator 10. For example, the switching circuit 50 is used to switch between bands B8, B20, B28, and B5. By designing the position of the switching circuit 50 electrically connected to the main radiator 10, the switching circuit 50 does not affect the frequency bands supported by the target higher-order mode or the second resonant mode when switching sub-bands of the first frequency band, thereby ensuring that the second resonant mode and the second frequency band supported by the target higher-order mode remain constant during sub-band switching of the first frequency band. For example, the antenna assembly 100 can maintain the N41 band or the Wi-Fi 2.4G band constantly active when switching between sub-bands (B8 band, B20 band, B28 band, B5 band) of the LB band.

[0052] The antenna assembly 100 provided in this application embodiment is designed with a main radiator 10 including a first free end A, a tuning point B, a feed point C, and a second free end D arranged sequentially. The parasitic radiator 20 includes a third free end E and a first grounding point F. A coupling gap exists between the third free end E and the second free end D. The parasitic radiator 20 is coupled to the main radiator 10. The first grounding point F is used for grounding. A signal source 30 is used to excite the main radiator 10 to form a first resonant mode supporting a first frequency band. The signal source 30 is also used to excite the parasitic radiator 20 to form a second resonant mode supporting a second frequency band and a target higher-order mode. The target higher-order mode and... The second resonant modes together form a dual-wave resonance supporting the second frequency band. One end of the switching circuit 50 is electrically connected to the tuning point B, and the other end is grounded. The switching circuit 50 is used to switch the sub-bands of the first frequency band and keep the second resonant mode and the second frequency band supported by the target higher-order mode constantly active. The above design enables the antenna assembly 100 to support both the first and second frequency bands simultaneously. By designing the second frequency band to form a dual-wave resonance, the efficiency of the second frequency band is improved. By setting the switching circuit 50, the sub-band switching in the first frequency band is realized, and the second frequency band remains active when the sub-band switching of the first frequency band is performed, thereby improving antenna performance and saving space.

[0053] Please see Figure 4 The antenna assembly 100 also includes a matching circuit M. The matching circuit M is electrically connected between the feed point C and the signal source 30. The matching circuit M is used to adjust the impedance matching between the port of the signal source 30 and the port of the main radiator 10. The matching circuit M includes at least one of the following components: capacitor, inductor, resistor, etc.

[0054] The following description, in conjunction with the accompanying drawings, details the support of the first and second frequency bands for the antenna assembly 100.

[0055] The signal source 30 excites the main radiator 10 to form a first resonant mode supporting the first frequency band. In this embodiment, both ends of the main radiator 10 are free ends. The feed point C is located near the center of the main radiator 10, and the antenna formed by the main radiator 10 is a T-type antenna.

[0056] By designing the antenna form of the main radiator 10, the electrical length of the main radiator 10, the circuit structure of the matching circuit M, and the position of the feed point C on the main radiator 10, a resonant mode can be formed on the main radiator 10 when the signal source 30 provides the excitation signal of the target frequency band, so as to transmit and receive electromagnetic wave signals of the target frequency band.

[0057] Please see Figure 5 and Figure 6For a T-type antenna, the first resonant mode formed on the main radiator 10 excited by the signal source 30 includes a first sub-mode and a second sub-mode, which coexist. The first sub-mode represents one distribution pattern of the resonant current, and the second sub-mode represents another distribution pattern. The first resonant mode indicates that two resonant modes are formed on the main radiator 10 excited by the signal source 30, and the resonant currents of these two modes coexist.

[0058] Please see Figure 5 The first sub-current Q5 of the first sub-mode is distributed between the first free terminal A and the feed point C. The second sub-current Q6 of the first sub-mode is distributed between the second free terminal D and the feed point C. The direction of the first sub-current Q5 is opposite to the direction of the second sub-current Q6.

[0059] For example, the first sub-current Q5 of the first sub-mode flows from the feed point C to the first free end A, and the second sub-current Q6 flows from the feed point C to the second free end D. Due to the periodicity of the current, the current direction can also be reversed, for example, the first sub-current Q5 of the first sub-mode flows from the first free end A to the feed point C, and from the second free end D to the feed point C.

[0060] The electrical length from the first feed point C to the first free end A is close to one-quarter wavelength of the center frequency of the first frequency band. For example, the difference between the electrical length from the first feed point C to the first free end A and one-quarter wavelength of the center frequency of the first frequency band is less than one-tenth wavelength of the center frequency of the first frequency band. The signal source 30 excites the formation of a first sub-current Q5 on the first feed point C to the first free end A, and the first sub-current Q5 operates in the one-quarter wavelength mode of the first frequency band.

[0061] The electrical length described in this application can satisfy the following formula:

[0062]

[0063] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in free space.

[0064] The electrical length from the first feed point C to the second free end D is approximately one-quarter of the wavelength of the center frequency of the first frequency band. For example, the difference between the electrical length from the first feed point C to the second free end D and one-quarter of the wavelength of the center frequency of the first frequency band is less than one-tenth of the wavelength of the center frequency of the first frequency band. The signal source 30 excites the formation of a second sub-current Q6 on the first feed point C to the second free end D, and this second sub-current Q6 operates in the one-quarter wavelength mode of the first frequency band.

[0065] Please also see Figure 6The signal source 30 also excites a second sub-mode resonance mode to be formed between the first free end A and the second free end D on the main radiator 10. The resonant current Q7 of the second sub-mode is distributed between the first free end A and the second free end D.

[0066] For example, the resonant current Q7 of the second sub-mode can flow from the first free terminal A to the second free terminal D. Due to the periodicity of the current, the current can also flow in the opposite direction, for example, the resonant current Q7 of the second sub-mode can flow from the first free terminal A to the second free terminal D.

[0067] The electrical length from the first free end A to the second free end D is close to half the wavelength of the third frequency band. For example, the difference between the electrical length from the first free end A to the second free end D and half the wavelength of the center frequency of the third frequency band is less than 1 / 10 of the wavelength of the center frequency of the third frequency band. The signal source 30 excites a resonant current Q7 forming a second sub-mode on the first free end A to the second free end D. This second sub-mode is a half-wavelength mode of the third frequency band. The resonant frequency of the second sub-mode (the center frequency of the third frequency band) is greater than the resonant frequency of the first sub-mode (the center frequency of the first frequency band). The resonant frequency of the second sub-mode (the center frequency of the third frequency band) is less than the resonant frequency of the second resonant mode (the center frequency of the second frequency band).

[0068] For the first frequency band (e.g., the LB band), the signal source 30 excites the main radiator 10 to simultaneously generate resonant currents for both a first sub-mode and a second sub-mode. The current in the main radiator 10 for the first sub-mode is a reverse current (from feed point C to the first free terminal A, and from feed point C to the second free terminal D). The resonant current of the first sub-mode forms a current loop with the ground current on the reference ground 500. The first sub-mode is also called the radiating mode. The radiating mode is a mode dependent on the reference ground 500. Simultaneously, the signal source 30 also excites the main radiator 10 to generate a resonant current Q7 for the second sub-mode. The current in the main radiator 10 for the second sub-mode is a unidirectional current (from the first free terminal A to the first feed point C, and from the first feed point C to the second free terminal D). The second sub-mode is also called the balanced mode. The balanced mode is a mode that does not depend on the reference ground 500.

[0069] When the frequency band supported by the balanced mode (third frequency band) is located on the high-frequency side of the frequency band supported by the radiated mode (first frequency band), and the frequency band supported by the balanced mode is close to the frequency band supported by the radiated mode (e.g., less than 1 GHz), the balanced mode can produce an efficiency enhancement effect, thereby improving the in-band efficiency of the radiated mode, that is, improving the in-band efficiency of the first frequency band (e.g., LB band).

[0070] For the second frequency band (N41 band or Wi-Fi 2.4G band), the signal source 30 excites the parasitic radiator 20 to form a main resonant mode (second resonant mode) and a secondary resonant mode (target higher-order mode) on the main radiator 10. Among them, the main resonant mode makes the main contribution to the radiation of the second frequency band, while the secondary resonant mode contributes to improving the bandwidth and efficiency of the main resonant mode.

[0071] Please see Figure 7 The electrical length from the first grounding point F to the second free end D is approximately one-quarter of the wavelength of the center frequency of the second frequency band. For example, the difference between the electrical length from the first feed point C to the second free end D and one-quarter of the wavelength of the center frequency of the second frequency band is less than one-tenth of the wavelength of the center frequency of the second frequency band. The resonant current of the second resonant mode is distributed between the first grounding point F and the second free end D. The second resonant mode is the one-quarter wavelength mode of the second frequency band.

[0072] Since the main radiator 10 is a T-shaped antenna, its electrical length is close to twice the wavelength of 1 / 4 of the first frequency band. Therefore, the electrical length of the main radiator 10 is relatively long. For example, the radiator length of a typical low-frequency IFA antenna is about 40 mm, while the radiator length of the T-shaped antenna in this application is about 70 mm. The effective electrical length of the T-shaped antenna in this application is close to the target higher-order mode of the second frequency band. The target higher-order mode is a mode with one wavelength of the second frequency band. The resonant current of the target higher-order mode is distributed between the first free end A and the second free end D. That is, by designing the antenna supporting the LB frequency band as a T-shaped antenna structure, the electrical length of the main radiator 10 in the LB frequency band is close to one wavelength of the second frequency band. For example, the difference between the electrical length of the main radiator 10 and one wavelength of the center frequency of the second frequency band is less than 1 / 10 of the wavelength of the center frequency of the second frequency band. Thus, the main radiator 10 supporting the first frequency band can also support a resonant mode of one wavelength for the second frequency band, which can serve as an auxiliary resonant mode for the second resonant mode. This increases the bandwidth and efficiency of the second frequency band, improves the bandwidth and efficiency of the N41 band or the Wi-Fi 2.4G band, and enables the antenna assembly 100 to support both the LB band and the N41 band or the Wi-Fi 2.4G band effectively, while maintaining good operating efficiency in both the LB band and the N41 band (or the Wi-Fi 2.4G band).

[0073] Please see Figure 8The main radiator 10 is roughly divided into four sub-radiation segments, named the first sub-radiation segment 10a, the second sub-radiation segment 10b, the third sub-radiation segment 10c, and the fourth sub-radiation segment 10d. The end of the first sub-radiation segment 10a furthest from the second sub-radiation segment 10b is the first free end A. The end of the fourth sub-radiation segment 10d furthest from the third sub-radiation segment 10c is the second free end D. The lengths of these four segments are similar, and the difference in electrical length between any two segments is less than 1 / 10 of the wavelength of the center frequency of the first frequency band. The resonant current of the target higher-order mode on the main radiator 10 is divided into the first segment current Q1, the second segment current Q2, the third segment current Q3, and the fourth segment current Q4, distributed sequentially. Specifically, the first current Q1 flows from one end of the first sub-radiating segment 10a connected to the second sub-radiating segment 10b to the first free end A, and the first current Q1 decreases from a relatively large current to a relatively small current; the second current Q2 flows from one end of the first sub-radiating segment 10a connected to the second sub-radiating segment 10b to the other end of the second sub-radiating segment 10b (near the feed point C), and the second current Q2 decreases from a relatively large current to a relatively small current; the third current Q3 flows from one end of the third sub-radiating segment 10c connected to the fourth sub-radiating segment 10d to the other end of the third sub-radiating segment 10c, and the third current Q3 decreases from a relatively large current to a relatively small current; the fourth current Q4 flows from one end of the fourth sub-radiating segment 10d connected to the third sub-radiating segment 10c to the other end of the fourth sub-radiating segment 10d, and the fourth current Q4 decreases from a relatively large current to a relatively small current.

[0074] Generally, low-frequency switchability is an important function of antenna assembly 100. This application achieves sub-band switchability of LB by designing a switching circuit 50, as shown in the following specific embodiment.

[0075] In this embodiment, the position where the switching circuit 50 is electrically connected to the main radiator 10 is called the tuning point B. The tuning point B is located in the weak current region of the target higher-order mode on the main radiator 10. The resonant current distribution of the target higher-order mode is relatively small (very small) within the weak current region of the target higher-order mode on the main radiator 10. The switching circuit 50 switches the sub-band of LB in the weak current region of the target higher-order mode on the main radiator 10. When the switching circuit 50 switches the sub-band of LB, it has almost no impact on the current distribution of the target higher-order mode or has a small impact on the current distribution of the target higher-order mode, so that the target higher-order mode does not experience frequency deviation or has very small frequency deviation, and keeps the second frequency band (N41 band or Wi-Fi 2.4G band) constantly active, so that the antenna assembly 100 supports switchable low-frequency bands and keeps the N41 band or Wi-Fi 2.4G band constantly active while switching low-frequency bands. Thus, when the electronic device 1000 is a mobile phone, it can meet the requirement of supporting the CA (carrier aggregation) combination of LB+N41 in the dual-SIM mode of the mobile phone.

[0076] The current-weak region of the target higher-order mode on the main radiator 10 includes a position near the first free end A and a position near the second free end D.

[0077] Specifically, based on the first segment current Q1 to the fourth segment current Q4 of the target higher-order mode on the main radiator 10, the current weak region of the target higher-order mode on the main radiator 10 includes the position of the first segment current Q1 near the first free end A, the position of the second segment current Q2 near the second free end D, and the region at the junction of the third segment current Q3 and the fourth segment current Q4 (near the feed point C).

[0078] Based on the first sub-current Q5 and the second sub-current Q6 of the first sub-mode on the main radiator 10, it can be known that the position near the feed point C is the current return position of the first sub-mode, that is, the position of strong current, which can also be called the electric wall position. Since the switching circuit 50 cannot effectively switch the sub-band of the first frequency band when switching the electric wall position on the main radiator 10, the tuning point B is set near the first free end A and near the second free end D, and is located in the strong current region (electric) formed by the first sub-mode on the main radiator 10. Outside the wall position, since the tuning point B is located outside the strong current region (electric wall position) formed on the main radiator 10 by the first sub-mode, it satisfies the requirement for the switching circuit 50 to effectively switch the sub-band of the first frequency band. Also, since the tuning point B is located near the first free end A and near the second free end D, when the switching circuit 50 switches the sub-band of LB, it will hardly affect the current distribution of the target higher-order mode or have little impact on the current distribution of the target higher-order mode, thus maintaining the constant presence of the second frequency band (N41 band or Wi-Fi 2.4G band).

[0079] Please see Figure 9 and Figure 10 The current-weak region of the target higher-order mode on the main radiator 10 includes the region on the main radiator 10 where the distance between it and the first free end A is less than or equal to the target preset distance (the region close to the first free end A), and the region on the main radiator 10 where the distance between it and the second free end D is less than or equal to the target preset distance (the region close to the second free end D). The target preset distance is 1 / 10 of the wavelength of the first frequency band. In the region on the main radiator 10 where the distance between it and the first free end A is greater than 1 / 10 of the wavelength of the center frequency of the first frequency band, the current of the target higher-order mode is relatively large. If the switching circuit 50 switches in this region, it will cause a frequency shift in the target higher-order mode.

[0080] Both the target higher-order mode and the second resonant mode support the second frequency band, and the center frequency of the frequency band supported by the target higher-order mode is different from the center frequency of the second resonant mode. This allows the target higher-order mode to increase the bandwidth of the frequency band supported by the second resonant mode. For example, if the second frequency band is 2.5-2.7 GHz, the frequency band supported by the second resonant mode is 2.5-2.6 GHz, and the frequency band supported by the target higher-order mode is 2.6-2.8 GHz, then the second resonant mode and the target higher-order mode can support a bandwidth of 2.5-2.8 GHz.

[0081] Optionally, by designing the electrical length of the parasitic radiator 20 and the electrical length of the main radiator 10, the center frequency of the frequency band supported by the target higher-order mode is greater than the center frequency of the second resonant mode, so that the target higher-order mode can improve the efficiency of the second resonant mode.

[0082] Since the second resonant mode is the dominant resonant mode, the frequency band supported by the second resonant mode can cover most or all of the second frequency band (most of which is the lower-frequency side of the second frequency band). When the center frequency of the frequency band supported by the target higher-order mode is lower than the center frequency of the second resonant mode, the continuous frequency band supported by the target higher-order mode and the second resonant mode has a certain frequency offset from the second frequency band, making it impossible to effectively increase the bandwidth and improve the efficiency of the second frequency band. However, when the center frequency of the frequency band supported by the target higher-order mode is higher than the center frequency of the second resonant mode, the continuous frequency band supported by the target higher-order mode and the second resonant mode completely covers the second frequency band. When the efficiency of the second resonant mode decreases, the appearance of the target higher-order mode can cause the efficiency of the second resonant mode to decrease slightly and then increase again, thus improving the efficiency of the second frequency band.

[0083] When the switching circuit 50 is turned on, the resonant current of the first resonant mode is grounded through the switching circuit 50.

[0084] The following is a detailed illustration of the structure of the switch switching circuit 50, with reference to the accompanying drawings.

[0085] Please see Figure 11 The switching circuit 50 includes a switching unit 51 and multiple switching branches 52. One end of the switching unit 51 is electrically connected to the tuning point B, and the other end of the switching unit 51 is used to select at least one of the multiple switching branches 52. The switching branch 52 includes, but is not limited to, a grounding inductor or a grounding capacitor. The switching branch 52 can be a single grounding branch, a series branch, or a parallel branch.

[0086] The switching unit 51 includes, but is not limited to, transistors, triodes, field-effect transistors, etc.

[0087] When the switching unit 51 switches to different switching branches 52, the switching circuit 50 has different impedances. After the main radiator 10 is connected to different impedance circuits, the electrical length of the resonant current of the first resonant mode passing through the switching circuit 50 to ground is changed, thereby tuning the sub-band size of the first frequency band and realizing the frequency band supported by the antenna assembly 100 is adjustable.

[0088] Optional, please refer to Figure 12 The switching branch 52 includes an inductor L. Optionally, since a small inductance in the inductor L of the switching branch 52 can easily cause frequency deviation in the frequency band supported by the target higher-order mode, the inductor L in the switching branch 52 is set to a large inductance. This allows the switching circuit 50 to switch the sub-bands of the first frequency band while reducing the impact on the frequency band supported by the target higher-order mode. Optionally, the inductance value of the large inductor L is greater than or equal to 20nH.

[0089] Please see Figure 13 , Figure 13 This is an S-curve diagram showing the switching of the antenna assembly 100 provided in this application embodiment between the B5 band, B8 band, B20 band, and B28 band.

[0090] Antenna assembly 100 can switch between bands B5, B8, B20, and B28. When switching unit 51 switches to grounding the large inductor L1, it switches to band B20. When switching unit 51 switches to grounding L2, it switches to band B28. When switching unit 51 switches to grounding L3 and L4 in parallel, it switches to band B8, where L3 and L4 have the same inductance value. When switching unit 51 switches to grounding one L3 and one L1 (or L2) in parallel, it switches to band B5. For example, the inductance value of L1 is 70nH to 90nH, such as 82nH; the inductance value of L2 is 70nH to 90nH, such as 82nH; the inductance value of L3 is 20nH; and the inductance value of L4 is 20nH. Of course, in other embodiments, switching unit 51 can also switch to grounding an inductor of approximately 10nH to switch to band B8.

[0091] Since the resonant current of the second resonant mode is mainly distributed on the parasitic radiator 20, and the switching circuit 50 is electrically connected to the main radiator 10, the switching circuit 50 will not affect the current distribution on the parasitic radiator 20 when switching. Therefore, the switching of the LB band will not affect the size of the N41 band.

[0092] Please see Figure 13 , Figure 13This is a graph showing the S-parameter curves of the antenna assembly 100 provided in this application when switching between the B5, B8, B20, and B28 frequency bands. Curve a is the S-parameter curve of the antenna assembly 100 in the B28 frequency band. Curve b is the S-parameter curve of the antenna assembly 100 in the B20 frequency band. Curve c is the S-parameter curve of the antenna assembly 100 in the B5 frequency band. Curve d is the S-parameter curve of the antenna assembly 100 in the B8 frequency band.

[0093] from Figure 13 Points 1, 2, 3, and 4 show that the low frequency can switch between sub-bands such as B5, B8, B20, and B28 to cover the overall commonly used low frequency range. From... Figure 13 The fact that the frequency points of the waves around 2.55 GHz and around 2.7 GHz remain unchanged shows that when the low frequency switches between sub-bands such as B5, B8, B20, and B28, the frequency points of the N41 band and the 1st higher-order mode remain unchanged. That is, the switching circuit 50 of this application does not affect the size of the N41 band or the frequency point of the higher-order mode when switching.

[0094] Please see Figure 14 , Figure 14 This is an efficiency diagram of the antenna assembly 100 provided in this application embodiment switching between frequency bands B5, B8, B20, and B28. Curve a1 is the radiation efficiency curve of the antenna assembly 100 in the B28 frequency band. Curve b1 is the radiation efficiency curve of the antenna assembly 100 in the B20 frequency band. Curve c1 is the radiation efficiency curve of the antenna assembly 100 in the B5 frequency band. Curve d1 is the radiation efficiency curve of the antenna assembly 100 in the B8 frequency band. Curve a2 is the overall efficiency curve of the antenna assembly 100 in the B28 frequency band. Curve b2 is the overall efficiency curve of the antenna assembly 100 in the B20 frequency band. Curve c2 is the overall efficiency curve of the antenna assembly 100 in the B5 frequency band. Curve d2 is the overall efficiency curve of the antenna assembly 100 in the B8 frequency band.

[0095] from Figure 14 Points 1, 2, 3, and 4 show that the efficiency of low-frequency bands B5, B8, B20, and B28 is all above -6.3dB, indicating relatively good efficiency during low-frequency handover. Furthermore, the efficiency data from 2.5GHz to 2.7GHz shows that the N41 band antenna achieves dual-mode coverage, and the impact of LB handover on N41 is minimal, with efficiency generally maintained at around -5.5dB.

[0096] This application establishes a first slit 41 at the second free end D of the main radiator 10 and forms a parasitic radiator 20 next to the main radiator 10. The main radiator 10 operates in the LB frequency band, and the parasitic radiator 20 operates in the N41 frequency band. Simultaneously, a higher-order mode of LB is formed on the main radiator 10. This higher-order mode of LB acts as a loading resonance behind the N41 frequency band. The bandwidth of the N41 frequency band operating mode increases after the introduction of the higher-order mode of LB, thus expanding the N41 operating bandwidth. Furthermore, the N41 frequency band operating mode and the higher-order mode of LB form... Dual-wave design improves radiation efficiency and overall efficiency; the parasitic radiator 20 supports the N41 band resonant mode as a parasitic mode, ensuring that the N41 band is almost unaffected when the LB is switched; the switch circuit 50 is located in the weak current region of the higher-order mode, ensuring that the higher-order mode of the LB is almost unaffected when the LB is switched. In this way, the N41 band is designed on the LB antenna, so that the volume buttons do not need to be equipped with an N41 antenna, saving costs and ensuring antenna efficiency. At the same time, the LB band can be switched and the dual-card (N41+LB) performance is ensured.

[0097] This application does not specify the positions of the main radiator 10 and the parasitic radiator 20 on the frame 320 of the electronic device 1000.

[0098] In one alternative implementation, please refer to Figure 3 A portion of the main radiator 10 is located at the bottom edge 322, and another portion of the main radiator 10 is located at the first side edge 323 (the left side of the rear view of the electronic device 1000). The parasitic radiator 20 is located at the first side edge 323. The parasitic radiator 20 is located on the side of the main radiator 10 away from the bottom edge 322.

[0099] Please see Figure 3 The power supply point C is located near the connection point between the first side edge 323 and the bottom edge 322. The signal source 30 can be located on a small board (or sub-board 700) of the electronic device 1000. The position of the signal source 30 corresponding to the power supply point C is designed to avoid the speaker and reduce losses on the radio frequency transmission path.

[0100] The grounding point of the parasitic radiator 20 can be grounded by physical return to ground. Since the grounding point of the parasitic radiator 20 is located on the first side 323 next to the battery compartment 900, it is inconvenient to install the circuit board. Therefore, the grounding point of the parasitic radiator 20 is grounded by physical return to ground (i.e., disconnected from the metal alloy of the reference floor 500 and the frame 320), which is low cost and easy to form.

[0101] In this embodiment, approximately half the length of the main radiator 10 is located at the bottom edge 322. Since the main radiator 10 is a T-shaped antenna, its length is close to 35mm. Thus, the first free end A is located near the charging port (USB interface) at the bottom edge 322. The second free end D is located on the first side edge 323, 35mm away from the bottom edge 322, ensuring that the distance between the second free end D and the bottom edge 322 is greater than or equal to a second preset distance. The second preset distance is, for example, 30mm. When the distance between the second free end D and the bottom edge 322 is less than the second preset distance, the second free end D is easily held by the hand when the electronic device 1000 is held horizontally, leading to severe frequency deviation in the first frequency band and the inability to operate in the first frequency band. When the distance between the second free end D and the bottom edge 322 is greater than or equal to the second preset distance, the second free end D is located outside the holding area of ​​the electronic device 1000 in the horizontal holding state, reducing frequency deviation and other problems of the electronic device 1000 in the horizontal holding state.

[0102] This embodiment designs the antenna structure of the main radiator 10 as a T-shaped antenna structure. This T-shaped antenna structure is longer than a typical low-frequency inverted-F antenna structure (for example, nearly twice the length of a typical low-frequency F antenna). Thus, based on the compact design, when the first free end A of the main radiator 10 is placed near the charging port (USB interface), the second free end D of the main radiator 10 is also located outside the hand grip area of ​​the electronic device 1000 in landscape mode. This makes reasonable use of the area on the frame 320 and ensures that the low-frequency antenna is not affected by hand grip when holding the device in landscape mode. More importantly, it can generate higher-order modes that support the second frequency band and improve the working efficiency of the second frequency band.

[0103] Please see Figure 15 The antenna assembly 100 is a first antenna element 100a that supports the second frequency band. For the second frequency band, the antenna element formed by the signal source 30, the main radiator 10, and the parasitic radiator 20 is the first antenna element 100a.

[0104] Taking the N41 band as an example, multiple antenna elements supporting the second band are typically designed to form a 2x2 MIMO antenna or a 4x4 MIMO antenna. Alternatively, multiple antenna elements supporting the second band can be intelligently switched to select the antenna element with the best signal strength. This ensures the stability of the second band by intelligently switching to the antenna element with the strongest signal in various handheld scenarios or under different signal conditions. Of course, the second band can also be other bands that can be designed as nxn MIMO antennas or intelligently switched.

[0105] Please see Figure 15The electronic device 1000 further includes a second antenna unit 100b supporting the second frequency band (e.g., N41 band), a third antenna unit 100c supporting the second frequency band, and a fourth antenna unit 100d supporting the second frequency band.

[0106] Please see Figure 15 The second antenna unit 100b is located on the top edge 321. The third antenna unit 100c is located on the second side edge 324. The fourth antenna unit 100d is located on the bottom edge 322. Since the main operating mode of the second frequency band is located on the parasitic radiator 20, which is located on the first side edge 323, the first antenna unit 100a mainly transmits and receives electromagnetic waves from the parasitic radiator 20 on the first side edge 323 when operating in the second frequency band.

[0107] The above design enables a 4*4 MIMO antenna for the second frequency band and also supports intelligent switching of antenna units. By distributing the positions of the first antenna unit 100a, the second antenna unit 100b, the third antenna unit 100c, and the fourth antenna unit 100d on the frame 320, the signal isolation between the first antenna unit 100a to the fourth antenna unit 100d supporting the same frequency band is improved.

[0108] For example, the second antenna element 100b is located at the top edge 321 near the second side edge 324. The second antenna element 100b is a port-to-port antenna formed by the main stub and parasitic stubs, where the main stub is an inverted F antenna. The main stub is the radiator for transmitting and receiving the second frequency band, that is, the main current of the second frequency band operates on the main stub.

[0109] Please see Figure 15 The third antenna element 100c is located in the middle of the second side 324. The third antenna element 100c is a port-to-port antenna formed by a main stub and a parasitic stub, where the main stub is an inverted-F antenna. The main stub is the radiator for transmitting and receiving the second frequency band; that is, the main current of the second frequency band operates on the main stub. The parasitic stub of the third antenna element 100c is located next to the battery compartment 900, and the main stub of the third antenna element 100c is located on the side of the parasitic stub of the third antenna element 100c that faces away from the bottom edge 322.

[0110] Please see Figure 15The fourth antenna element 100d is located at the bottom edge 322 and is adjacent to the main branch of the first antenna element 100a. The fourth antenna element 100d is a port-to-port antenna formed by the main branch and the parasitic branch, where the main branch is an inverted-F antenna. The main branch is the radiator for transmitting and receiving the second frequency band, meaning that the main current of the second frequency band operates on the main branch. The parasitic branch of the fourth antenna element 100d is located between the main branch of the first antenna element 100a and the main branch of the fourth antenna element 100d. A charging port is located at the location of the parasitic branch of the fourth antenna element 100d. The second gap 42 on one side of the charging port is the gap between the parasitic branch of the fourth antenna element 100d and the main branch of the first antenna element 100a, and the third gap on the other side of the charging port is the gap between the parasitic branch of the fourth antenna element 100d and the main branch of the fourth antenna element 100d.

[0111] The above layout design ensures good isolation and a compact structure for the first antenna unit 100a, the second antenna unit 100b, the third antenna unit 100c, and the fourth antenna unit 100d when they operate in the second frequency band, saving space so that more antennas can be laid out on the electronic device 1000.

[0112] Please see Figure 16 The electronic device 1000 further includes a fifth antenna unit 100e and a sixth antenna unit 100f supporting a third frequency band. In this embodiment, when the second frequency band is the N41 band, the third frequency band is the Wi-Fi 2.4G band. Of course, in other embodiments, when the second frequency band is the Wi-Fi 2.4G band, the third frequency band is the N41 band.

[0113] Please see Figure 16 The fifth antenna element 100e is disposed on the first side 323. Further, the first side 323 has an area for mounting a button portion 800, which includes a volume button 810 and a power button 820. The power button 820 is located on the side of the volume button 810 opposite to the top edge 321. No antenna is disposed at the locations of either the power button 820 or the volume button 810. Both the power button 820 and the volume button 810 are grounded.

[0114] The fifth antenna unit 100e is disposed between the button portion 800 and the top edge 321. The first antenna unit 100a is disposed between the button portion 800 and the bottom edge 322. The fifth antenna unit 100e is disposed between the volume button 810 and the top edge 321. Optionally, the fifth antenna unit 100e is an inverted F antenna. The resonant current of the fifth antenna unit 100e when operating in the second frequency band is a 1 / 4 wavelength current mode.

[0115] Please see Figure 16The sixth antenna element 100f is disposed on the top edge 321. The sixth antenna element 100f is spaced apart from the second antenna element 100b. The sixth antenna element 100f is disposed adjacent to the fifth antenna element 100e. A portion of the radiator of the sixth antenna element 100f is located on the first side edge 323, and another portion of the radiator of the sixth antenna element 100f is located on the top edge 321.

[0116] Optionally, the sixth antenna element 100f is an inverted-F antenna. The resonant current of the sixth antenna element 100f when operating in the second frequency band is in 1 / 4 wavelength current mode.

[0117] The grounding point of the fifth antenna element 100e is adjacent to the grounding point of the sixth antenna element 100f. That is, the free end of the fifth antenna element 100e is opposite to the free end of the sixth antenna element 100f. The feed point C of the radiator of the fifth antenna element 100e is located on the first side 323, and the feed point C of the radiator of the sixth antenna element 100f is located on the top side 321. The distance between the feed points C of the radiators of the fifth antenna element 100e and the sixth antenna element 100f is relatively large to increase the isolation between the fifth antenna element 100e and the sixth antenna element 100f.

[0118] The grounding point of the fifth antenna unit 100e and the grounding point of the sixth antenna unit 100f are insulated from each other. An insulated gap exists between the grounding points of the fifth antenna unit 100e and the sixth antenna unit 100f to further increase the isolation between them.

[0119] Furthermore, the area on the first side 323 where the button portion 800 is located is an area without an antenna. That is, no antenna is installed in the area where the button portion 800 is located.

[0120] Because a Wi-Fi 2.4G antenna or an N41 antenna is placed at the button section 800 (volume button 810), its wavelength is close to the electrical length of the flexible circuit board of the volume button 810. Therefore, the flexible circuit board of the volume button 810 will generate noise that falls within the antenna's operating frequency band, affecting efficiency by 2-3 dB. If an isolation circuit is added to the flexible circuit board of the volume button 810 to change the electrical length of the flexible circuit board and make it resonate outside the antenna's operating frequency band, it will increase costs. Furthermore, since the volume button 810 is located within the antenna clearance, it will still have an impact of about 1 dB on antenna efficiency that cannot be eliminated. Moreover, since the antenna is located at the button section 800 (volume button 810), the antenna feed point (metal tongue) needs to be set at that location, and because the volume button 810 body is externally connected to this location, the antenna implementation cost increases.

[0121] Generally, 5G phones need to support four N41 antennas and two Wi-Fi 2.4G (MIMO) antennas. Since the N41 and Wi-Fi 2.4G operating frequency bands are adjacent, placing them on the same antenna requires an additional extractor at the RF end, increasing costs. This means that six antennas operating at the same frequency need to be placed on a 320mm bezel. Furthermore, N41 and Wi-Fi 2.4G antennas cannot be placed side-by-side in a port-to-port configuration simultaneously, as this results in poor isolation between the antennas and very low efficiency. Therefore, this presents a significant challenge to the design.

[0122] This application achieves a layout of 6 antennas for two similar or identical frequency bands by arranging the first antenna element 100a to the sixth antenna element 100f, ensuring the isolation of the 6 antennas. Compared with arranging the N41 antenna and the Wi-Fi 2.4G antenna on the same antenna, it reduces costs and also ensures antenna performance when held with both hands.

[0123] 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 antenna assembly, characterized in that, include: The main radiator includes a first free end and a second free end arranged opposite to each other, as well as a feed point and a tuning point located between the first free end and the second free end; A parasitic radiator, comprising a third free end and a first grounding point, wherein the third free end and the second free end are connected by a coupling gap, and the first grounding point is used for grounding; A signal source is electrically connected to the feed point. The signal source is used to excite the main radiator to form a first resonant mode supporting a first frequency band. The signal source is also used to excite the parasitic radiator to form a second resonant mode supporting a second frequency band and to excite the main radiator to form a target higher-order mode supporting the second frequency band. The target higher-order mode is a mode with one wavelength of the second frequency band. The target higher-order mode and the second resonant mode together form a double-wave resonance supporting the second frequency band. The center frequency of the frequency band supported by the target higher-order mode is greater than the center frequency of the second resonant mode. and A switching circuit is provided, one end of which is electrically connected to the tuning point and the other end is grounded. The switching circuit is used to switch the sub-band of the first frequency band. The second resonant mode and the second frequency band supported by the target higher-order mode remain stationary when switching the sub-band of the first frequency band. The switching circuit includes an inductor element with an inductance value greater than or equal to 20nH.

2. The antenna assembly as claimed in claim 1, characterized in that, The resonant current of the target higher-order mode is distributed between the first free end and the second free end.

3. The antenna assembly as described in claim 2, characterized in that, The tuning point is located in the weak current region of the target higher-order mode on the main radiator.

4. The antenna assembly as described in claim 3, characterized in that, The target high-order mode current-weak region on the main radiator includes the region on the main radiator where the distance between it and the first free end is less than or equal to the target preset distance, and the region on the main radiator where the distance between it and the second free end is less than or equal to the target preset distance, wherein the target preset distance is 1 / 10 wavelength of the first frequency band.

5. The antenna assembly as claimed in claim 1, characterized in that, The first resonant mode includes a first sub-mode and a second sub-mode; The first sub-current of the first sub-mode is distributed between the first free end and the feed point, and the second sub-current of the first sub-mode is distributed between the feed point and the second free end. The direction of the first sub-current is opposite to the direction of the second sub-current. The first sub-current operates in 1 / 4 wavelength mode of the first frequency band, and the second sub-current operates in 1 / 4 wavelength mode of the first frequency band. The resonant current of the second sub-mode is distributed between the first free end and the second free end. The second sub-mode is a half-wavelength mode of the third frequency band. The resonant frequency of the second sub-mode is greater than that of the first sub-mode.

6. The antenna assembly as claimed in claim 1, characterized in that, The resonant current of the second resonant mode is distributed between the first grounding point and the second free end, and the second resonant mode is a 1 / 4 wavelength mode of the second frequency band.

7. The antenna assembly as described in any one of claims 1-6, characterized in that, The switching circuit includes a switching unit and multiple switching branches. One end of the switching unit is electrically connected to the tuning point, and the other end of the switching unit is used to select at least one of the multiple switching branches.

8. The antenna assembly as described in any one of claims 1-6, characterized in that, The first frequency band is the LB band, and the second frequency band is the N41 band or the Wi-Fi 2.4G band.

9. An electronic device, characterized in that, The device includes a frame and an antenna assembly as described in any one of claims 1-8. The frame includes a top edge, a first side edge, a bottom edge, and a second side edge connected in sequence. A portion of the main radiator is located on the first side edge, and another portion of the main radiator is located on the bottom edge. The distance between the second free end and the bottom edge is greater than or equal to a second preset distance, such that the second free end is located outside the grip area when the electronic device is in a landscape grip state. The parasitic radiator is located on the first side edge.

10. The electronic device as claimed in claim 9, characterized in that, The antenna assembly is a first antenna unit that supports the second frequency band. The electronic device also includes a second antenna unit, a third antenna unit, and a fourth antenna unit that support the second frequency band. The second antenna unit is located on the top edge, the third antenna unit is located on the second side edge, and the fourth antenna unit is located on the bottom edge.

11. The electronic device as claimed in claim 10, characterized in that, The electronic device further includes a fifth antenna unit and a sixth antenna unit supporting a third frequency band. The fifth antenna unit is located on the first side, and the sixth antenna unit is located on the top side. The sixth antenna unit is spaced apart from the second antenna unit. The grounding point of the fifth antenna unit is adjacent to the grounding point of the sixth antenna unit, and the grounding points of the fifth antenna unit and the sixth antenna unit are insulated from each other. When the second frequency band is the N41 frequency band, the third frequency band is the Wi-Fi 2.4G frequency band; when the second frequency band is the Wi-Fi 2.4G frequency band, the third frequency band is the N41 frequency band.

12. The electronic device as claimed in claim 11, characterized in that, The first side has an area for mounting the button part, and the area on the first side with the button part is an area without an antenna. The fifth antenna unit is located between the button part and the top edge, and the first antenna unit is located between the button part and the bottom edge.

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