Antenna assembly and electronic equipment

Abstract

The invention provides an antenna assembly. A main radiator comprises a first free end, a second free end, a feeding point and a tuning point; the parasitic radiator comprises a third free end and a first grounding point, and a coupling gap is formed between the third free end and the second free end; the signal source is electrically connected with the feeding point, is used for exciting a first resonance mode supporting a first frequency band on the main radiator, and is also used for exciting a second resonance mode supporting a second frequency band on the parasitic radiator and exciting a target high-order mode supporting the second frequency band on the main radiator; the target high-order mode and the second resonance mode jointly form double-wave resonance supporting a second frequency band; one end of the switch switching circuit is electrically connected with the tuning point, and the other end is grounded; the switch switching circuit is used for switching the sub-frequency bands of the first frequency band, and the second resonant mode and a second frequency band supported by the target high-order mode remain resident when the sub-frequency bands of the first frequency band are switched. The antenna performance can be improved, and the occupied space is saved.

Description

Technical Field

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

[0002] With the development of network technology, the demand for high transmission rate of data transmission is getting higher and higher. The space for setting antennas on electronic devices is limited, and the increasing antenna functions require more and more antennas. Therefore, how to improve antenna performance and save space has become a technical problem that needs to be solved. Summary of the invention

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

[0004] An embodiment of the present application provides an antenna assembly, including:

[0005] A main radiator, comprising a first free end and a second free end disposed opposite to each other, and a feeding point and a tuning point disposed between the first free end and the second free end;

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

[0007] a signal source, electrically connected to the feeding point, the signal source being used to excite the main radiator to form a first resonance mode supporting a first frequency band, the signal source being further used to excite the parasitic radiator to form a second resonance 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 resonance mode jointly forming a double-wave resonance supporting the second frequency band; and

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

[0009] The antenna assembly provided in the embodiment of the present application is designed such that the main radiator includes a first free end and a second free end arranged opposite to each other, and a feeding point and a tuning point arranged 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 is formed between the third free end and the second free end; the parasitic radiator is coupled to the main radiator; the first grounding point is used for grounding; a signal source is used for exciting the main radiator to form a first resonant mode supporting a first frequency band; the signal source is also used for exciting the parasitic radiator to form a second resonant mode supporting a second frequency band and a target high-order mode; the target high-order mode Together with the second resonant mode, a dual-wave resonance supporting the second frequency band is formed. One end of the switch switching circuit is electrically connected to the tuning point and the other end is grounded. The switch switching circuit is used to switch the sub-band of the first frequency band and keep the second resonant mode and the second frequency band supported by the target higher-order mode permanent. The above design can realize that the antenna component supports the first frequency band and the second frequency band at the same time, and by designing the second frequency band to form a dual-wave resonance, the efficiency of the second frequency band is improved. By setting the switch switching circuit, the sub-band switching in the first frequency band is realized, and the second frequency band remains permanent when the sub-band of the first frequency band is switched, thereby improving the antenna performance and saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0011] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0012] Figure 2 It is a schematic diagram of a partial decomposition structure of an electronic device provided in an embodiment of the present application;

[0013] Figure 3 It is a partial back view of an electronic device provided by an embodiment of the present application;

[0014] Figure 4 is a structural schematic diagram of an antenna assembly provided in an embodiment of the present application;

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

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

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

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

[0019] Fig. 9 This is a schematic diagram of a first configuration structure of a switch switching circuit of an antenna assembly provided in an embodiment of the present application;

[0020] Fig.10 This is a schematic diagram of a first configuration structure of a switch switching circuit of an antenna assembly provided in an embodiment of the present application;

[0021] Fig.11 is a schematic diagram of the structure of a switch switching circuit provided in an embodiment of the present application;

[0022] Fig.12 This is an example schematic diagram of a switch switching circuit provided in an embodiment of the present application;

[0023] Fig.13 is an S parameter curve diagram of the antenna assembly 100 provided in an embodiment of the present application switching between the B5 frequency band, the B8 frequency band, the B20 frequency band, and the B28 frequency band;

[0024] Fig.14 is an efficiency diagram of the antenna assembly 100 provided in an embodiment of the present application switching between the B5 frequency band, the B8 frequency band, the B20 frequency band, and the B28 frequency band;

[0025] Fig.15 It is a partial back view of an electronic device provided by an embodiment of the present application, in which a first antenna unit to a fourth antenna unit are provided;

[0026] Fig.16 It is a partial back view of an electronic device provided by an embodiment of the present application, which is provided with first to sixth antenna units. DETAILED DESCRIPTION

[0027] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

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

[0029] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0030] See also Figure 1 , Figure 1 The following is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. The electronic device 1000 includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, a robot, a digital camera, and other devices with communication functions. The present embodiment of the present application is described using a mobile phone as an example, and other electronic devices may refer to this embodiment.

[0031] See also Figure 2 , Figure 2 1 is a partial exploded schematic diagram of an electronic device 1000. The electronic device 1000 includes an antenna assembly 100. Taking the electronic device 1000 as a mobile phone as an example, the working environment of the antenna assembly 100 is illustrated. The electronic device 1000 includes a display screen 200, a middle frame 300 and a back cover 400 arranged in sequence along the thickness direction. Among them, the middle frame 300 includes a middle plate 310 and a frame 320 surrounding the side of the middle plate 310. The frame 320 may be a conductive frame. Of course, in other embodiments, the electronic device 1000 may not have a middle plate 310. The display screen 200, the middle plate 310 and the back cover 400 are stacked in sequence, and a receiving space is formed between the display screen 200 and the middle plate 310, and between the middle plate 310 and the back cover 400 to accommodate components such as a mainboard, a camera module, a receiver module, a battery, and various sensors. One side of the frame 320 is connected to the edge of the display screen 200, and the other side of the frame 320 is connected to the edge of the back cover 400 to form a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integrated structure, and the frame 320 and the back cover 400 can be a separate structure. The above is the working environment of the antenna assembly 100 taking a mobile phone as an example, but the antenna assembly 100 of the present application is not limited to the above working environment.

[0032] See also Figure 3 , Figure 33 is a back view of the electronic device 1000. The frame 320 includes a top edge 321 and a bottom edge 322 that are arranged opposite to each other, and a first side edge 323 and a second side edge 324 that are connected to the top edge 321 and the bottom edge 322. The top edge 321 is the side away from the ground when the user holds the electronic device 1000 and uses it in portrait mode, and the bottom edge 322 is the side facing the ground when the user holds the electronic device 1000 and uses it in portrait mode. The first side edge 323 is the left side when the user holds the electronic device 1000 and uses it in portrait mode. The second side edge 324 is the right side when the user holds the electronic device 1000 and uses it in portrait mode. Of course, the first side edge 323 can also be the right side when the user holds the electronic device 1000 and uses it. The second side edge 324 is the left side when the user holds the electronic device 1000 and uses it.

[0033] See also Figure 2 , the electronic device 1000 includes a reference floor 500. The shape of the reference floor 500 is roughly rectangular, wherein the reference ground edge of the reference floor 500 includes but is not limited to a straight edge or a regular edge. Because devices are set up in the mobile phone as needed or other structures are avoided, various grooves, holes, etc. are opened on the reference ground edge of the reference floor 500. The reference floor 500 includes but is not limited to the metal alloy part of the middle plate 310 and the reference ground metal part of the circuit board (including the main board 600 and the sub-board 700). Roughly speaking, the reference ground system in the electronic device 1000 can be equivalent to a rough rectangle, so it is called the reference floor 500. Among them, the reference floor 500 does not indicate that the shape of the reference ground is plate-shaped and is a rectangular plate. The outer contour of the reference floor 500 is close to the inner side of the frame 320.

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

[0035] The main radiator 10 and the parasitic radiator 20 are ports for the antenna assembly 100 to send and receive radio frequency signals. The radio frequency signal is transmitted in the air medium in the form of an electromagnetic wave signal. The present application does not specifically limit the material of the main radiator 10 and the parasitic radiator 20. Optionally, the material of the main radiator 10 is a conductive material, including but not limited to conductive materials such as metals and alloys.

[0036] The present application does not specifically limit the shapes of the main radiator 10 and the parasitic radiator 20. For example, the shapes of the main radiator 10 or the parasitic radiator 20 include but are not limited to strips, sheets, rods, coatings, films, and the like. Figure 3The shapes of the main radiator 10 and the parasitic radiator 20 shown are only examples and cannot limit the shapes of the main radiator 10 and the parasitic radiator 20 provided in the present application. In the present embodiment, the main radiator 10 and the parasitic radiator 20 are both in the shape of strips. The present application does not limit the extension trajectory of the main radiator 10. Optionally, the main radiator 10 may extend along a straight line, or along a curve, or along a bend line. In the present embodiment, the main radiator 10 extends along a bend line or other trajectories. In other embodiments, the main radiator 10 is in the shape of a straight line. The main radiator 10 described above may be a line with uniform width on the extension trajectory, or may be a strip with unequal widths such as a gradient width and a widened area.

[0037] The present 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 in or on the frame 320, a flexible printed circuit board antenna formed on a flexible circuit board (Flexible Printed Circuit board, FPC), a laser direct structured antenna by laser direct structure (Laser Direct Structuring, LDS), a printed direct structured antenna by printing direct structure (Print Direct Structuring, PDS), a conductive sheet antenna (such as a metal bracket antenna), etc. The present application takes the example that the main radiator 10 and the parasitic radiator 20 are both part of the frame 320.

[0038] See also Figure 4 The main radiator 10 includes a first free end A, a tuning point B, a feeding point C and a second free end D which are arranged in sequence.

[0039] The first free end A is the end of the frame 320 after the first slit 41 is set. 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 improve the overall structural strength of the frame 320.

[0040] The tuning point B is a position between the feeding point C and the first free end A, and the present application does not make any specific limitation on its specific position.

[0041] The second free end D is an end portion 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 improve the overall structural strength of the frame 320.

[0042] See also Figure 4The parasitic radiator 20 includes a third free end E and a first grounding point F. A coupling gap, namely a first gap 41, is formed 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 portion after the second slit 42 is provided on the frame 320. The second slit 42 is filled with insulating material so that the second free end D and the third free end E are insulated.

[0044] The first grounding point F is electrically connected to the reference ground plane 500 , and the electrical connection method includes but is not limited to physical connection for interconnection as one, or indirect connection through conductive springs, radio frequency connection lines, and the like.

[0045] See also Figure 4 , the signal source 30 is electrically connected to the feeding point C. The signal source 30 includes but is not limited to a radio frequency transceiver chip, etc. The signal source 30 is used to provide a radio frequency excitation current. After the radio frequency 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 the embodiment of the present application, the signal source 30 is disposed on the mainboard 600. The electrical connection between the signal source 30 and the feeding point C includes but is not limited to indirect connection through a radio frequency connection line, a conductive spring, etc. Specifically, the signal source 30 is electrically connected to the feeding point C through a feeding spring (conductive spring) disposed on the mainboard 600.

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

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

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

[0050] This application does not make specific limitations on the first frequency band and the second frequency band. The first frequency band and the second frequency band are different frequency bands. The first frequency band and the second frequency band are at least one of the LB band (less than 1 GHz), the MHB band (1-3 GHz), the UHB band (greater than 3 GHz), the Wi-Fi band, the GPS band, etc. The first frequency band and the second frequency band can be a 4G band or a 5G band. For example, the first frequency band is the LB band, and the second frequency band is the N41 band in the MHB band. For another example, the first frequency band is the LB band, and the second frequency band is the Wi-Fi 2.4G band.

[0051] See also Figure 4 , one end of the switch switching circuit 50 is electrically connected to the tuning point B, and the other end of the switch switching circuit 50 is electrically connected to the reference floor 500. The switch switching circuit 50 is used to switch the sub-band of the first frequency band by changing the electrical length of the main radiator 10. For example, the switch switching circuit 50 is used to switch between the B8 frequency band, the B20 frequency band, the B28 frequency band, and the B5 frequency band. By designing the position where the switch switching circuit 50 is electrically connected to the main radiator 10, the switch switching circuit 50 does not affect the frequency band supported by the target high-order mode and the frequency band supported by the second resonance mode when switching the sub-band of the first frequency band, thereby achieving that the second resonance mode and the second frequency band supported by the target high-order mode remain resident when switching the sub-band of the first frequency band. For example, the antenna assembly 100 can achieve keeping the N41 band resident or the Wi-Fi 2.4G band resident when the LB band switches between sub-bands (B8 band, B20 band, B28 band, B5 band).

[0052] The antenna assembly 100 provided in the embodiment of the present application is designed such that the main radiator 10 includes a first free end A, a tuning point B, a feeding point C and a second free end D which are arranged in sequence, the parasitic radiator 20 includes a third free end E and a first grounding point F, a coupling gap is formed between the third free end E and the second free end D, the parasitic radiator 20 is coupled with the main radiator 10, the first grounding point F is used for grounding, the signal source 30 is used for exciting the main radiator 10 to form a first resonant mode supporting a first frequency band, the signal source 30 is also used for exciting the parasitic radiator 20 to form a second resonant mode supporting a second frequency band and a target high-order mode, the target high-order mode and The second resonant mode jointly forms a dual-wave resonance supporting the second frequency band. One end of the switch switching circuit 50 is electrically connected to the tuning point B, and the other end is grounded; the switch switching circuit 50 is used to switch the sub-band of the first frequency band and keep the second resonant mode and the second frequency band supported by the target higher-order mode permanent. The above design can realize that the antenna component 100 supports the first frequency band and the second frequency band at the same time, and forms a dual-wave resonance by designing the second frequency band to improve the efficiency of the second frequency band; by setting the switch switching circuit 50, the sub-band switching in the first frequency band is realized, and the second frequency band remains permanent when the sub-band of the first frequency band is switched, thereby improving the antenna performance and saving space.

[0053] See also Figure 4 The antenna assembly 100 further includes a matching circuit M. The matching circuit M is electrically connected between the feeding 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 a capacitor, an inductor, a resistor, and the like.

[0054] The following is a detailed description of the antenna assembly 100 supporting the first frequency band and the second frequency band in conjunction with the accompanying drawings.

[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 opposite ends of the main radiator 10 are free ends. The feeding 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 feeding point C on the main radiator 10, when the signal source 30 provides an excitation signal of the target frequency band, a resonant mode can be formed on the main radiator 10 to transmit and receive electromagnetic wave signals of the target frequency band.

[0057] See also Figure 5 and Figure 6For the T-type antenna, the first resonant mode formed on the main radiator 10 by the signal source 30 includes a first sub-mode and a second sub-mode, and the first sub-mode and the second sub-mode exist at the same time. Among them, the first sub-mode represents a distribution mode of a resonant current, and the second sub-mode represents another distribution mode of a resonant current. The first resonant mode indicates that the signal source 30 excites the main radiator 10 to form two resonant modes, and the resonant currents of the two resonant modes exist at the same time.

[0058] See also Figure 5 , the first sub-current Q5 of the first sub-mode is distributed between the first free end A and the feeding point C. The second sub-current Q6 of the first sub-mode is distributed between the second free end D and the feeding 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 feeding point C to the first free end A, and the second sub-current Q6 flows from the feeding point C to the second free end D. Due to the periodicity of the current, the direction of the current can also flow in the opposite direction, for example, the first sub-current Q5 of the first sub-mode flows from the first free end A to the feeding point C, and flows from the second free end D to the feeding point C.

[0060] The electrical length from the first feeding point C to the first free end A is close to 1 / 4 wavelength of the center frequency of the first frequency band. For example, the difference between the electrical length from the first feeding point C to the first free end A and 1 / 4 wavelength of the center frequency of the first frequency band is less than 1 / 10 wavelength of the center frequency of the first frequency band. The signal source 30 excites the first feeding point C to the first free end A to form a first sub-current Q5, and the first sub-current Q5 operates in the 1 / 4 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 feeding point C to the second free end D is close to 1 / 4 wavelength of the center frequency of the first frequency band. For example, the difference between the electrical length from the first feeding point C to the second free end D and 1 / 4 wavelength of the center frequency of the first frequency band is less than 1 / 10 wavelength of the center frequency of the first frequency band. The signal source 30 excites the first feeding point C to the second free end D to form a second sub-current Q6, and the second sub-current Q6 operates in the 1 / 4 wavelength mode of the first frequency band.

[0065] Also, see Figure 6The signal source 30 also excites the first free end A and the second free end D on the main radiator 10 to form a resonant mode of the second sub-mode. 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 may flow from the first free end A to the second free end D. Due to the periodicity of the current, the direction of the current may also flow in the opposite direction, for example, the resonant current Q7 of the second sub-mode flows from the first free end A to the second free end D.

[0067] The electrical length from the first free end A to the second free end D is close to 1 / 2 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 1 / 2 wavelength of the center frequency of the third frequency band is less than 1 / 10 wavelength of the center frequency of the third frequency band. The signal source 30 excites the first free end A to the second free end D to form a resonant current Q7 of the second sub-mode, and the second sub-mode is a 1 / 2 wavelength mode of the third frequency band. Among them, 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., LB frequency band), the signal source 30 excites the main radiator 10 to generate the resonant current of the first sub-mode and the second sub-mode at the same time, wherein the current of the first sub-mode on the main radiator 10 is a reverse current (from the feeding point C to the first free end A, and from the feeding point C to the second free end D is a reverse current), the resonant current of the first sub-mode forms a current loop with the floor current on the reference floor 500, and the first sub-mode is also called a radiation mode. The radiation mode is a mode that depends on the participation of the reference floor 500. At the same time, the signal source 30 also excites the main radiator 10 to generate the resonant current Q7 of the second sub-mode, and the current of the second sub-mode on the main radiator 10 is a unidirectional current (from the first free end A to the first feeding point C, and from the first feeding point C to the second free end D is a unidirectional current), and the second sub-mode is also called a balanced mode, which is relatively a mode that does not depend on the participation of the reference floor 500.

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

[0070] For the second frequency band (N41 frequency band or Wi-Fi 2.4G frequency 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 high-order mode) on the main radiator 10. The main resonant mode makes the main contribution to radiating the second frequency band, and the secondary resonant mode contributes to improving the bandwidth and efficiency of the main resonant mode.

[0071] See also Figure 7 , the electrical length from the first ground point F to the second free end D is close to 1 / 4 wavelength of the center frequency of the second frequency band. For example, the difference between the electrical length from the first feeding point C to the second free end D and 1 / 4 wavelength of the center frequency of the second frequency band is less than 1 / 10 wavelength of the center frequency of the second frequency band. The resonant current of the second resonant mode is distributed between the first ground point F and the second free end D. The second resonant mode is a 1 / 4 wavelength mode of the second frequency band.

[0072] Since the main radiator 10 is a T-shaped antenna, the electrical length of the main radiator 10 is close to twice the 1 / 4 wavelength of the first frequency band, so the electrical length of the main radiator 10 is relatively long. For example, the radiator length of the IFA antenna that generally supports low frequency is about 40 mm, while the radiator length of the T-shaped antenna in the present application is about 70 mm. The effective electrical length of the T-shaped antenna in the present application is close to the target high-order mode of the second frequency band. The target high-order mode is a 1-times wavelength mode of the second frequency band. The resonant current of the target high-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 to be a T-shaped antenna structure, the electrical length of the main radiator 10 in the LB frequency band is close to 1 times the wavelength of the second frequency band. For example, the difference between the electrical length of the main radiator 10 and 1 times the wavelength of the center frequency of the second frequency band is less than 1 / 10 wavelength of the center frequency of the second frequency band. In this way, the main radiator 10 supporting the first frequency band can also support the 1-times-wavelength resonant mode of the second frequency band, and the 1-times-wavelength mode can be used as an auxiliary resonant mode of the second resonant mode. This increases the bandwidth and efficiency of the second frequency band, and improves the bandwidth and efficiency of the N41 frequency band or the Wi-Fi 2.4G frequency band, so that the antenna assembly 100 can support the LB frequency band, and can also effectively support the N41 frequency band or the Wi-Fi 2.4G frequency band, and has good working efficiency in both the LB frequency band and the N41 frequency band (or the Wi-Fi 2.4G frequency band).

[0073] See also Figure 8, the main radiator 10 is roughly divided into four sub-radiation segments, which are named as 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 away from the second sub-radiation segment 10b is the first free end A. The end of the fourth sub-radiation segment 10d away 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 wavelength of the center frequency of the first frequency band. The resonant current of the target high-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, which are distributed in sequence. Among them, the first segment current Q1 flows from one end of the first sub-radiation segment 10a connected to the second sub-radiation segment 10b to the first free end A, and the first segment current Q1 decreases from a relatively large current to a relatively small current; the second segment current Q2 flows from one end of the first sub-radiation segment 10a connected to the second sub-radiation segment 10b to the other end of the second sub-radiation segment 10b (close to the feeding point C), and the second segment current Q2 decreases from a relatively large current to a relatively small current; the third segment current Q3 flows from one end of the third sub-radiation segment 10c connected to the fourth sub-radiation segment 10d to the other end of the third sub-radiation segment 10c, and the third segment current Q3 decreases from a relatively large current to a relatively small current, and the fourth segment current Q4 flows from one end of the fourth sub-radiation segment 10d connected to the third sub-radiation segment 10c to the other end of the fourth sub-radiation segment 10d, and the fourth segment current Q4 decreases from a relatively large current to a relatively small current.

[0074] Generally, low frequency switchability becomes an important function of the antenna assembly 100. The present application implements the switchability of the sub-band of LB by designing a switch switching circuit 50, and the specific embodiments are as follows.

[0075] In this embodiment, the position where the switch switching circuit 50 is electrically connected to the main radiator 10 is called tuning point B. The tuning point B is located in the current weak area of ​​the target high-order mode on the main radiator 10. The resonant current distribution of the target high-order mode in the current weak area of ​​the target high-order mode on the main radiator 10 is relatively small (very small). The switch switching circuit 50 switches the sub-band of LB in the current weak area of ​​the target high-order mode on the main radiator 10. When the switch switching circuit 50 switches the sub-band of LB, it will hardly affect the current distribution of the target high-order mode or have little effect on the current distribution of the target high-order mode, so that the target high-order mode does not have a frequency deviation or has a very small frequency deviation, and the second frequency band (N41 frequency band or Wi-Fi 2.4G frequency band) is kept resident, so that the antenna assembly 100 supports a switchable low-frequency band and keeps the N41 frequency band or Wi-Fi 2.4G frequency band resident while switching the low-frequency band. In this way, when the electronic device 1000 is a mobile phone, it can support the CA (carrier aggregation) combination of LB+N41 in the dual-SIM mode of the mobile phone.

[0076] The current weak area of ​​the target high-order mode on the main radiator 10 includes a position close to the first free end A and a position close to the second free end D.

[0077] Specifically, according to the first current segment Q1 to the fourth current segment Q4 of the target high-order mode on the main radiator 10, the current weak area of ​​the target high-order mode on the main radiator 10 includes the position of the first current segment Q1 close to the first free end A, the position of the second current segment Q2 close to the second free end D, and the area where the third current segment Q3 and the fourth current segment Q4 intersect (close to the feeding point C).

[0078] According to 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 close to the feeding point C is the current return position of the first sub-mode, that is, the current strong point position, which can also be called the electric wall position. Since the switch 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 at a position close to the first free end A and a position close to the second free end D, and is located in the current strong area (electrical wall) formed by the first sub-mode on the main radiator 10. In this way, because the tuning point B is located outside the current intensity area (electric wall position) formed by the first sub-mode on the main radiator 10, so as to satisfy the switch switching circuit 50 to effectively switch the sub-band of the first frequency band, and because the tuning point B is set at a position close to the first free end A and close to the second free end D, when the switch switching circuit 50 switches the sub-band of LB, it will hardly affect the current distribution of the target high-order mode or the impact on the current distribution of the target high-order mode is small, and the second frequency band (N41 band or Wi-Fi 2.4G band) is kept permanent.

[0079] See also Fig. 9 and Fig.10 , the current weak area of ​​the target high-order mode on the main radiator 10 includes an area on the main radiator 10 where the distance from the first free end A is less than or equal to the target preset distance (an area close to the first free end A), and an area on the main radiator 10 where the distance from the second free end D is less than or equal to the target preset distance (an area close to the second free end D). The target preset distance is 1 / 10 wavelength of the first frequency band. The area on the main radiator 10 where the distance from the first free end A is greater than 1 / 10 wavelength of the center frequency of the first frequency band, the current of the target high-order mode in this area is relatively large, and if the switch switching circuit 50 switches in this area, the target high-order mode will be frequency-deviation.

[0080] The target higher-order mode and the second resonant mode both 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, so that the target higher-order mode can increase the bandwidth of the frequency band supported by the second resonant mode. For example, the second frequency band is 2.5-2.7GHz, the frequency band supported by the second resonant mode is 2.5-2.6GHz, and the frequency band supported by the target higher-order mode is 2.6-2.8GHz. In this way, the second resonant mode and the target higher-order mode can support a bandwidth of 2.5-2.8GHz.

[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 high-order mode is greater than the center frequency of the second resonant mode, so that the target high-order mode improves the efficiency of the second resonant mode.

[0082] Since the second resonance mode is the main resonance mode, the frequency band supported by the second resonance mode can cover most of the second frequency band (most of the second frequency band is the frequency band on the low-frequency side of the second frequency band) or all of the second frequency band. When the center frequency of the frequency band supported by the target higher-order mode is less than the center frequency of the second resonance mode, the target higher-order mode and the continuous frequency band supported by the second resonance mode have a certain frequency deviation from the second frequency band, and the bandwidth of the second frequency band cannot be effectively increased and the efficiency cannot be improved. When the center frequency of the frequency band supported by the target higher-order mode is greater than the center frequency of the second resonance mode, the target higher-order mode and the continuous frequency band supported by the second resonance mode completely cover the second frequency band. When the efficiency of the second resonance mode decreases, the appearance of the target higher-order mode can make the efficiency of the second resonance mode have a small decrease and then increase again, thus improving the efficiency of the second frequency band.

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

[0084] The structure of the switch circuit 50 is specifically described below with reference to the accompanying drawings.

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

[0086] The switch unit 51 includes but is not limited to a transistor, a triode, a field effect transistor, etc.

[0087] When the switch unit 51 switches to different switching branches 52, the switch switching circuit 50 has different impedances. After different impedance circuits are connected to the main radiator 10, the electrical length of the resonant current of the first resonant mode going to the ground through the switch switching circuit 50 is changed, and then the sub-band size of the first frequency band is tuned, so that the frequency band supported by the antenna assembly 100 can be adjusted.

[0088] Optional, see Fig.12 , the switching branch 52 includes an inductor element L. Further optionally, since when the inductor element L in the switching branch 52 is a small inductor, it is easy to cause the frequency band supported by the target higher-order mode to deviate, the inductor element L in the switching branch 52 is set to a large inductor, which can not only enable the switch switching circuit 50 to switch the sub-band of the first frequency band, but also reduce the impact on the frequency band supported by the target higher-order mode. Optionally, the inductor element L is a large inductor with an inductance value greater than or equal to 20nH.

[0089] See also Fig.13 , Fig.13 It is an S-curve diagram of the antenna assembly 100 provided in an embodiment of the present application switching between the B5 frequency band, the B8 frequency band, the B20 frequency band, and the B28 frequency band.

[0090] The antenna assembly 100 can switch between the B5 frequency band, the B8 frequency band, the B20 frequency band, and the B28 frequency band. When the switch unit 51 switches to the large inductance L1 to the ground, it switches to the B20 frequency band. When the switch unit 51 switches to the L2 to the ground, it switches to the B28 frequency band. When the switch unit 51 switches to the L3 and L4 to the ground in parallel, it switches to the B8 frequency band, wherein the inductance values ​​of L3 and L4 are the same. When the switch unit 51 switches to one L3 and one L1 (or L2) to the ground in parallel, it switches to the B5 frequency band. For example, the inductance value of L1 is 70nH to 90nH, for example, 82nH; the inductance value of L2 is 70nH to 90nH, for example, 82nH; the inductance value of L3 is 20nH; the inductance value of L4 is 20nH. Of course, in other embodiments, the switch unit 51 can also be switched to an inductance of about 10nH to the ground to switch to the B8 frequency band.

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

[0092] See also Fig.13 , Fig.131 is an S parameter curve diagram of the antenna assembly 100 provided in the embodiment of the present application switching between the B5 frequency band, the B8 frequency band, the B20 frequency band, and the B28 frequency band. 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 Fig.13 It can be seen from points 1, 2, 3, and 4 that the low frequency can be switched between sub-bands such as B5, B8, B20, and B28 to cover the overall commonly used low frequency band. Fig.13 It can be seen that the frequency of the wave around 2.55 GHz and the frequency of the wave around 2.7 GHz remain unchanged. When the low frequency switches between sub-bands such as B5, B8, B20, and B28, the frequency of the N41 band and the 1 times higher-order mode remains unchanged, that is, the switch switching circuit 50 of the present application does not affect the size of the N41 band or the frequency of the higher-order mode when switching.

[0094] See also Fig.14 , Fig.14 It is an efficiency diagram of the antenna assembly 100 provided in the embodiment of the present application switching between the B5 frequency band, the B8 frequency band, the B20 frequency band, and the B28 frequency band. Among them, 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 total efficiency curve of the antenna assembly 100 in the B28 frequency band. Curve b2 is the total efficiency curve of the antenna assembly 100 in the B20 frequency band. Curve c2 is the total efficiency curve of the antenna assembly 100 in the B5 frequency band. Curve d2 is the total efficiency curve of the antenna assembly 100 in the B8 frequency band.

[0095] from Fig.14 It can be seen from points 1, 2, 3, and 4 that the low-frequency efficiency in the B5, B8, B20, and B28 bands is above -6.3dB, indicating that the low-frequency switching has relatively good efficiency. In addition, from the efficiency of 2.5GHz-2.7GHz, it can be seen that the N41 band antenna has achieved dual-mode coverage, and the LB switching has little impact on the N41, and the efficiency can basically be maintained at around -5.5dB.

[0096] The present application sets 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 works in the LB band, and the parasitic radiator 20 works in the N41 band. At the same time, a high-order mode of LB is formed on the main radiator 10. The high-order mode of LB is resonated behind the N41 band as a loading. The broadband of the working mode of the N41 band is increased after the high-order mode of LB is introduced, thereby expanding the working bandwidth of N41. In addition, the working mode of the N41 band is formed by the high-order mode of LB. Dual waves improve radiation efficiency and overall efficiency; the resonant mode supporting the N41 frequency band on the parasitic radiator 20 is a parasitic mode, which ensures that when the LB is switched, there is almost no impact on the N41 frequency band; the switch switching circuit 50 is located in the weak current area of ​​the high-order mode, which ensures that when the LB is switched, there is almost no impact on the high-order mode of the LB. In this way, the N41 frequency band is designed on the LB antenna, so that the volume button does not need to be set with the N41 antenna, which saves costs and ensures antenna efficiency. At the same time, the LB frequency band can be switched and the dual-card (N41+LB) performance is ensured.

[0097] The present application does not specifically limit the positions where the main radiator 10 and the parasitic radiator 20 are arranged on the frame 320 of the electronic device 1000 .

[0098] In an alternative embodiment, see Figure 3 A portion of the main radiator 10 is disposed on the bottom edge 322, another portion of the main radiator 10 is disposed on the first side edge 323 (the left side of the back view of the electronic device 1000), and the parasitic radiator 20 is disposed on the first side edge 323. The parasitic radiator 20 is located on a side of the main radiator 10 away from the bottom edge 322.

[0099] See also Figure 3 The feeding 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 disposed on the small board (or the sub-board 700) of the electronic device 1000. The signal source 30 is designed to correspond to the position of the feeding point C to avoid the speaker and reduce the loss on the radio frequency transmission path.

[0100] The grounding point of the parasitic radiator 20 can be grounded by physically returning to the 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 not convenient to set up a circuit board. In this way, the grounding point of the parasitic radiator 20 is physically returned to the ground (that is, the metal alloy of the reference floor 500 is disconnected from the frame 320), which is low in cost and easy to form.

[0101] In this embodiment, about half of the length of the main radiator 10 is set at the bottom 322. Since the main radiator 10 is a T-shaped antenna, the length of the main radiator 10 is close to 35 mm. In this way, the first free end A is located at the position of the bottom 322 adjacent to the charging port (USB interface). The second free end D is located on the first side 323 and is 35 mm away from the bottom 322, so that the distance between the second free end D and the bottom 322 is greater than or equal to the second preset distance. The second preset distance is, for example, 30 mm. When the distance between the second free end D and the bottom 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 in the horizontal screen, resulting in serious frequency deviation in the first frequency band, and the first frequency band cannot work. Problems. When the distance between the second free end D and the bottom 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 screen holding state, reducing the frequency deviation of the electronic device 1000 when the horizontal screen is held.

[0102] In this embodiment, the antenna structure of the main radiator 10 is designed to be a T-shaped antenna structure. The T-shaped antenna structure is longer than a general low-frequency inverted F antenna structure (for example, nearly twice the length of a general low-frequency F antenna). Thus, based on the compact design, when the first free end A of the main radiator 10 is arranged adjacent to the charging port (USB port), the second free end D of the main radiator 10 is also located outside the horizontal screen hand-holding area of ​​the electronic device 1000, thereby reasonably utilizing the area on the frame 320 and ensuring that the low-frequency antenna under horizontal screen holding is not affected by hand holding. More importantly, it can generate high-order modes that support the second frequency band, thereby improving the working efficiency of the second frequency band.

[0103] See also Fig.15 , the antenna assembly 100 is a first antenna unit 100a supporting the second frequency band. For the second frequency band, the antenna unit formed by the signal source 30, the main radiator 10 and the parasitic radiator 20 is the first antenna unit 100a.

[0104] Take the second frequency band as the N41 frequency band as an example. Generally, multiple antenna units supporting the second frequency band are designed to form a 2*2 MIMO antenna or a 4*4 MIMO antenna, or the antenna unit with the best signal strength is intelligently switched among multiple antenna units supporting the second frequency band, so that it can intelligently switch to the antenna unit with stronger signal to work in various handheld scenarios or various different signal environments, ensuring the stability of the second frequency band. Of course, the second frequency band can also be other frequency bands that can be designed as n*n MIMO antennas or intelligently switched.

[0105] See also Fig.15The electronic device 1000 also includes a second antenna unit 100b supporting the second frequency band (for example, the N41 frequency band), a third antenna unit 100c supporting the second frequency band, and a fourth antenna unit 100d supporting the second frequency band.

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

[0107] The above design realizes a 4*4 MIMO antenna for the second frequency band and can also support intelligent switching of antenna units by dispersing 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 border 320. For example, 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 unit 100b is located at the top edge 321 near the second side edge 324, and the second antenna unit 100b is a mouth-to-mouth antenna formed by a main branch node + a parasitic branch node, wherein the main branch node is an inverted F antenna. The main branch node is a radiator for transmitting and receiving the second frequency band, that is, the main current of the second frequency band works on the main branch node.

[0109] See also Fig.15 , the third antenna unit 100c is located in the middle of the second side 324. The third antenna unit 100c is a mouth-to-mouth antenna formed by a main branch + a parasitic branch, wherein the main branch is an inverted F antenna. The main branch is a radiator for transmitting and receiving the second frequency band, that is, the main current of the second frequency band works on the main branch. The parasitic branch of the third antenna unit 100c is located next to the battery compartment 900, and the main branch of the third antenna unit 100c is arranged on the side of the parasitic branch of the third antenna unit 100c away from the bottom edge 322.

[0110] See also Fig.15, the fourth antenna unit 100d is located at the bottom edge 322 and is adjacent to the main branch of the first antenna unit 100a. The fourth antenna unit 100d is a mouth-to-mouth antenna formed by the main branch + parasitic branch, wherein the main branch is an inverted F antenna. The main branch is a radiator for transmitting and receiving the second frequency band, that is, the main current of the second frequency band works on the main branch. The parasitic branch of the fourth antenna unit 100d is located between the main branch of the first antenna unit 100a and the main branch of the fourth antenna unit 100d. A charging port is set at the location of the parasitic branch of the fourth antenna unit 100d. The second break 42 on one side of the charging port is a break between the parasitic branch of the fourth antenna unit 100d and the main branch of the first antenna unit 100a, and the third break on the other side of the charging port is a break between the parasitic branch of the fourth antenna unit 100d and the main branch of the fourth antenna unit 100d.

[0111] The above layout design enables the first antenna unit 100a, the second antenna unit 100b, the third antenna unit 100c, and the fourth antenna unit 100d to have good isolation and compact structure when operating in the second frequency band, saving space so as to facilitate the layout of more antennas on the electronic device 1000.

[0112] See also Fig.16 , the electronic device 1000 also 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 frequency band, the third frequency band is the Wi-Fi 2.4G frequency band. Of course, in other embodiments, when the second frequency band is the Wi-Fi 2.4G frequency band, the third frequency band is the N41 frequency band.

[0113] See also Fig.16 , the fifth antenna unit 100e is arranged on the first side edge 323. Further, the first side edge 323 is provided with an area for installing the button portion 800, and the button portion 800 includes a volume button 810 and a power button 820. The power button 820 is located on the side of the volume button 810 away from the top edge 321. No antenna is arranged at the location of the power button 820 and the volume button 810. Both the power button 820 and the volume button 810 are grounded.

[0114] The fifth antenna unit 100e is arranged between the button portion 800 and the top edge 321. The first antenna unit 100a is arranged between the button portion 800 and the bottom edge 322. The fifth antenna unit 100e is arranged between the volume key 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] See also Fig.16, the sixth antenna unit 100f is arranged at the top edge 321. The sixth antenna unit 100f is arranged at a distance from the second antenna unit 100b. The sixth antenna unit 100f is arranged adjacent to the fifth antenna unit 100e. A portion of the radiator of the sixth antenna unit 100f is located at the first side edge 323, and another portion of the radiator of the sixth antenna unit 100f is located at the top edge 321.

[0116] Optionally, the sixth antenna unit 100f is an inverted F antenna. When the sixth antenna unit 100f operates in the second frequency band, the resonant current is a 1 / 4 wavelength current mode.

[0117] The grounding point of the fifth antenna unit 100e is arranged adjacent to the grounding point of the sixth antenna unit 100f. That is, the free end of the fifth antenna unit 100e is opposite to the free end of the sixth antenna unit 100f. The feeding point C of the radiator of the fifth antenna unit 100e is arranged at the first side 323, and the feeding point C of the radiator of the sixth antenna unit 100f is arranged at the top edge 321. The distance between the feeding point C of the radiator of the fifth antenna unit 100e and the feeding point C of the radiator of the sixth antenna unit 100f is relatively large to increase the isolation between the fifth antenna unit 100e and the sixth antenna unit 100f.

[0118] The grounding point of the fifth antenna unit 100e is insulated from the grounding point of the sixth antenna unit 100f. There is an insulation gap between the grounding point of the fifth antenna unit 100e and the grounding point of the sixth antenna unit 100f to further increase the isolation between the fifth antenna unit 100e and the sixth antenna unit 100f.

[0119] Furthermore, the area on the first side 323 where the button portion 800 is provided is an area where no antenna is provided, that is, no antenna is provided in the area where the button portion 800 is located.

[0120] Since the Wi-Fi 2.4G antenna or N41 antenna is arranged at the button part 800 (volume button 810), since its wavelength is close to the electrical length of the flexible circuit board of the volume button 810, the flexible circuit board of the volume button 810 will generate clutter that falls within the antenna operating frequency band, affecting the efficiency by 2-3dB. If an isolation circuit is set on the flexible circuit board of the volume button 810 to change the electrical length of the flexible circuit board so that it resonates outside the antenna operating frequency band, it will increase the cost, and since the volume button 810 is arranged in the antenna clearance, it will still have an impact of about 1dB on the antenna efficiency and cannot be eliminated. Moreover, the antenna is arranged at the button part 800 (volume button 810), and the antenna needs to set the antenna feed point position (metal tongue) there, and since the volume button 810 body is externally connected here, the cost of antenna implementation increases.

[0121] Generally, 5G mobile phones need to support 4 N41 antennas and 2 Wi-Fi 2.4G (MIMO) antennas. The N41 operating frequency band and the Wi-Fi 2.4G operating frequency band are close to each other. If they are arranged on the same antenna, the RF end needs to add an extractor, which increases the cost. That is to say, 6 antennas with the same frequency need to be arranged on the frame 320, and the N41 antenna and the Wi-Fi 2.4G antenna cannot be arranged at the same time in the port-to-port antenna, because such a layout leads to poor isolation between the antennas and low efficiency, which brings great challenges to the solution layout.

[0122] The present application realizes the layout of 6 antennas for two similar or identical frequency bands by arranging the above-mentioned first antenna unit 100a to the sixth antenna unit 100f, thereby ensuring the isolation of the 6 antennas. Compared with arranging the N41 antenna and the Wi-Fi 2.4G antenna on the same antenna, the cost is reduced and the antenna performance when held with both hands is ensured.

[0123] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. An antenna assembly, characterized in that: include: A main radiator, comprising a first free end and a second free end disposed opposite to each other, and a feeding point and a tuning point disposed between the first free end and the second free end; A parasitic radiator, the parasitic radiator comprising a third free end and a first grounding point, a coupling gap is formed between the third free end and the second free end, and the first grounding point is used for grounding; A signal source, electrically connected to the feeding point, the signal source is used to excite the main radiator to form a first resonance mode supporting the first frequency band, the signal source is also used to excite the parasitic radiator to form a second resonance mode supporting the second frequency band and to excite the main radiator to form a target high-order mode supporting the second frequency band, the target high-order mode and the second resonance mode together form a double-wave resonance supporting the second frequency band; and A switch switching circuit, one end of which is electrically connected to the tuning point and the other end is grounded; the switch switching circuit is used to switch the sub-band of the first frequency band, and the second frequency band supported by the second resonant mode and the target higher-order mode remains resident when the sub-band of the first frequency band is switched.

2. The antenna assembly according to claim 1, wherein: The resonant current of the target high-order mode is distributed between the first free end and the second free end, and the target high-order mode is a 1-time wavelength mode of the second frequency band.

3. The antenna assembly according to claim 2, wherein: The tuning point is located in a current weak region of the target high-order mode on the main radiator.

4. The antenna assembly according to claim 3, characterized in that The current weak zone of the target high-order mode on the main radiator includes an area on the main radiator whose distance from the first free end is less than or equal to the target preset distance, and an area on the main radiator whose distance from the second free end is less than or equal to the target preset distance, and the target preset distance is 1 / 10 wavelength of the first frequency band.

5. The antenna assembly according to claim 1, wherein: The center frequency of the frequency band supported by the target higher-order mode is greater than the center frequency of the second resonance mode.

6. The antenna assembly according to claim 1, wherein: The first resonance mode includes a first sub-mode and a second sub-mode; A first sub-current of the first sub-mode is distributed between the first free end and the feeding point, a second sub-current of the first sub-mode is distributed between the feeding point and the second free end, a direction of the first sub-current is opposite to a direction of the second sub-current, the first sub-current operates in a 1 / 4 wavelength mode of the first frequency band, and the second sub-current operates in a 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 1 / 2 wavelength mode of the third frequency band, and the resonant frequency point of the second sub-mode is greater than the resonant frequency point of the first sub-mode.

7. The antenna assembly according to claim 1, wherein: The resonant current of the second resonant mode is distributed between the first ground point and the second free end, and the second resonant mode is a 1 / 4 wavelength mode of the second frequency band.

8. The antenna assembly according to any one of claims 1 to 7, characterized in that: The switch switching circuit includes a switch unit and a plurality of switch branches. One end of the switch unit is electrically connected to the tuning point, and the other end of the switch unit is used to select at least one of the plurality of switch branches.

9. The antenna assembly according to claim 7, wherein: The switching branch includes an inductor element, and the inductance value of the inductor element is greater than or equal to 20nH.

10. The antenna assembly according to any one of claims 1 to 7 and 9, characterized in that: The first frequency band is the LB frequency band, and the second frequency band is the N41 frequency band or the Wi-Fi 2.4G frequency band.

11. An electronic device, characterized in that: It includes a frame and an antenna assembly as described in any one of claims 1-10, 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, another portion of the main radiator is located on the bottom edge, and a distance between the second free end and the bottom edge is greater than or equal to a second preset distance, so that the second free end is located outside a holding area when the electronic device is in a horizontal screen holding state, and the parasitic radiator is located on the first side edge.

12. The electronic device according to claim 11, characterized in that: The antenna assembly is a first antenna unit supporting the second frequency band, and the electronic device also includes a second antenna unit, a third antenna unit, and a fourth antenna unit supporting the second frequency band. The second antenna unit is arranged on the top edge, the third antenna unit is arranged on the second side edge, and the fourth antenna unit is arranged on the bottom edge.

13. The electronic device according to claim 12, characterized in that: The electronic device also includes a fifth antenna unit and a sixth antenna unit supporting a third frequency band, the fifth antenna unit is arranged on the first side, the sixth antenna unit is arranged on the top side, the sixth antenna unit and the second antenna unit are spaced apart, the grounding point of the fifth antenna unit is adjacent to the grounding point of the sixth antenna unit, the grounding point of the fifth antenna unit and the grounding point of the sixth antenna unit are insulated and disconnected, and 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.

14. The electronic device according to claim 13, characterized in that: The first side is provided with an area for installing a button part, the area on the first side where the button part is provided is an area where no antenna is provided, the fifth antenna unit is provided between the button part and the top side, and the first antenna unit is provided between the button part and the bottom side.

Images