CN118156771A

CN118156771A - Antenna assembly and electronic equipment

Info

Publication number: CN118156771A
Application number: CN202211550880.0A
Authority: CN
Inventors: 张凯; 尹晗
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2024-06-07

Abstract

The embodiment of the application discloses an antenna assembly and electronic equipment. The antenna assembly includes: the first radiator is provided with a first free end, a first coupling end and a feed point arranged between the first free end and the first coupling end, wherein a first connecting point is further arranged between the feed point and the first coupling end; a second radiator having a second coupling end and a second free end and a second connection point disposed between the second coupling end and the second free end, wherein the second connection point is electrically connected to a reference ground, wherein the second coupling end and the first coupling end form a coupling gap; the feed source is electrically connected to the first radiator through a feed point and is used for providing an excitation signal, and the excitation signal excites the first radiator and the second radiator to generate a first resonance mode supporting a first frequency band in the middle-high frequency MHB band, and a second resonance mode supporting a second frequency band in the MHB band and a third resonance mode; and the switching circuit is used for controlling the antenna assembly to work in the first frequency band or the second frequency band.

Description

Antenna assembly and electronic equipment

Technical Field

The embodiment of the application relates to the field of radio frequency communication, in particular to an antenna assembly and electronic equipment.

Background

With the development of communication technology, electronic devices such as smartphones are capable of realizing more and more functions, and communication modes of the electronic devices are also more diversified. It will be appreciated that each communication mode of the electronic device requires a corresponding antenna to support. However, with the development of electronic technology, electronic devices are increasingly miniaturized, thinned, and reduced in internal space, and antenna assemblies can be arranged to support multiple frequency bands.

In practical application, a feed source can be arranged to excite and generate Low frequency (LB) and medium-high frequency (MIDDLE HIGH Band, MHB) simultaneously. Because there are multiple frequency bands in the MHB frequency band, how to switch different frequency bands in the MHB frequency band in a low-cost manner is a problem to be solved.

Disclosure of Invention

In order to solve any of the above technical problems, an embodiment of the present application provides an antenna assembly and an electronic device.

In order to achieve the object of the embodiment of the present application, an embodiment of the present application provides an antenna assembly, including:

The first radiator is provided with a first free end, a first coupling end and a feed point arranged between the first free end and the first coupling end, wherein a first connecting point is further arranged between the feed point and the first coupling end;

a second radiator having a second coupling end and a second free end and a second connection point disposed between the second coupling end and the second free end, wherein the second connection point is electrically connected to a reference ground, wherein the second coupling end forms a coupling gap with the first coupling end;

The feed source is electrically connected to the first radiator through a feed point and is used for providing an excitation signal, and the excitation signal is also used for exciting the first radiator and the second radiator to generate a first frequency band and a first resonance mode which support a middle-high frequency MHB band and a second resonance mode and a third resonance mode which support a second frequency band in the MHB band;

And one end of the switching circuit is electrically connected with the first connecting point, and the other end of the switching circuit is electrically connected with the reference ground and used for controlling the antenna assembly to work in a first frequency band or a second frequency band.

An electronic device is provided with the antenna assembly.

One of the above technical solutions has the following advantages or beneficial effects:

Because the first radiator and the second radiator are mutually coupled, an excitation signal transmitted on the first radiator can be transmitted to the second radiator through the coupling gap, and the excitation signal can generate a first resonance mode supporting a first frequency band in the MHB frequency band and a second resonance mode and a third resonance mode supporting a second frequency band in the MHB frequency band on the first radiator and the second radiator. Because the excitation signal can be grounded through the switching circuit connected to the first radiator, the equivalent electric length of the excitation signal corresponding to the first to third resonance modes can be changed by the switching circuit, the purpose of controlling the antenna assembly to work in the first frequency band or the second frequency band is achieved, and the current MHB frequency band supported by the antenna assembly is adjusted.

Furthermore, when the adjustment of the MHB frequency band is realized, only the switching circuit and one wire (cable) for connecting the switching circuit to the first radiator are needed, so that the hardware cost is low, the number of elements is small, and the circuit arrangement and the circuit integration are convenient.

Additional features and advantages of embodiments of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of embodiments of the application. The objectives and other advantages of embodiments of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the technical solution of the embodiments of the present application, and are incorporated in and constitute a part of this specification, illustrate and explain the technical solution of the embodiments of the present application, and not to limit the technical solution of the embodiments of the present application.

Fig. 1 (a) is a schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 1 (b) is a schematic exploded view of the electronic device 1000 shown in fig. 1 (a);

Fig. 2 is a schematic structural diagram of the antenna assembly 100 mounted on the electronic device 1000;

fig. 3 is a schematic structural diagram of an antenna assembly 100 according to an embodiment of the present application;

FIG. 4 (a) is a schematic diagram illustrating a current distribution of a first resonant mode according to an embodiment of the present application;

FIG. 4 (b) is a schematic diagram showing the current distribution of the second resonant mode according to the embodiment of the present application

FIG. 4 (c) is a schematic diagram illustrating a current distribution of a third resonant mode according to an embodiment of the present application;

fig. 5 is another schematic structural diagram of the antenna assembly 100 shown in fig. 3;

fig. 6 is a schematic structural diagram of the MHB control unit 131 shown in fig. 5;

FIG. 7 is a schematic diagram of a current distribution of a fourth resonant mode according to an embodiment of the present application;

fig. 8 is a schematic diagram of another structure of the antenna assembly 100 shown in fig. 3;

fig. 9 is a schematic diagram of the structure of the LB control unit 132 shown in fig. 8;

Fig. 10 is a schematic view of another structure of the antenna assembly shown in fig. 3;

fig. 11 is a schematic diagram of another structure of an antenna assembly 100 according to an embodiment of the present application;

fig. 12 is a schematic diagram of the tuning circuit 14 shown in fig. 12;

Fig. 13 is a schematic diagram of S parameters of the antenna assembly 100 according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.

Referring to fig. 1 (a), fig. 1 (a) is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device 1000 includes an antenna assembly 100. The antenna assembly 100 is used for receiving and transmitting electromagnetic wave signals to realize a communication function of the electronic device 1000. The present application is not particularly limited as to the location of the antenna assembly 100 within the electronic device 1000. The electronic device 1000 further includes a display 300 and a housing 200 that are connected to each other in a covering manner.

The antenna assembly 100 may be disposed inside the housing 200 of the electronic device 1000, or partially integrated with the housing 200, or partially disposed outside the housing 200. The radiator of the antenna assembly 100 of fig. 1 (a) is integrated with the housing 200. Of course, the antenna assembly 100 may also be provided on a retractable assembly of the electronic device 1000, in other words, at least a portion of the antenna assembly 100 may also extend out of the electronic device 1000 with the retractable assembly of the electronic device 1000 and retract into the electronic device 1000 with the retractable assembly; or the overall length of the antenna assembly 100 may be extended as the retractable assembly of the electronic device 1000 is extended.

The antenna assembly 100 is used for implementing a wireless communication function of an electronic device, for example, the antenna assembly 100 may transmit wireless fidelity (WIRELESS FIDELITY Wi-Fi) signals, global positioning system (Global Positioning System GPS) signals, third Generation mobile communication technology (3 th-Generation 3G), fourth Generation mobile communication technology (4 th-Generation 4G), fifth Generation mobile communication technology (5 th-Generation 5G), near field communication (NEAR FIELD communication NFC) signals, and the like.

The electronic device 1000 includes, but is not limited to, a device capable of transmitting and receiving electromagnetic wave signals such as a telephone, a television, a tablet computer, a mobile phone, a camera, a personal computer, a notebook computer, an in-vehicle device, an earphone, a wristwatch, a wearable device, a base station, an in-vehicle radar, a customer premise equipment (Customer Premise Equipment, CPE), and the like. In the present application, the electronic device 1000 is taken as an example of a mobile phone, and other devices may refer to the specific description in the present application.

For convenience of description, with reference to a viewing angle of the electronic device 1000 in fig. 1 (a), a width direction of the electronic device 1000 is defined as an X-axis direction, a length direction of the electronic device 1000 is defined as a Y-axis direction, and a thickness direction of the electronic device 1000 is defined as a Z-axis direction. The X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other. Wherein the direction indicated by the arrow is forward.

Referring to fig. 1 (b), the housing 200 includes a frame 210 and a rear cover 220. Middle plate 230 is formed in frame 210 by injection molding, and a plurality of mounting grooves for mounting various electronic devices are formed in middle plate 230. Midplane 230, along with bezel 210, becomes a middle bezel 240 of electronic device 1000. After the display 300, the middle frame 240 and the rear cover 220 are covered, a receiving space is formed at both sides of the middle frame 420, and the receiving space can be used for placing the circuit board 500 and a reference ground (not shown). One side (e.g., the rear side) of the bezel 210 is surrounded on the periphery of the rear cover 220, and the other side (e.g., the front side) of the bezel 210 is surrounded on the periphery of the display screen 300.

The electronic device 1000 further includes a battery, a camera, a microphone, a receiver, a speaker, a face recognition module, a fingerprint recognition module, and the like, which are disposed in the accommodating space and can implement basic functions of the mobile phone, which are not described in detail in this embodiment.

Fig. 2 is a schematic structural diagram of the antenna assembly 100 mounted on the electronic device 1000. As shown in fig. 2, the ground GND includes a first side 61 and a second side 62 disposed opposite to each other, and a third side 63 and a fourth side 64 connected between the first side 61 and the second side 62. The junction between two adjacent sides is a corner 65. The first side 61 is a top edge of the ground GND (referred to as a state that the user holds the electronic device 1000 in a vertical position), and the second side 62 is a bottom edge of the ground GND.

As shown in fig. 2, the bezel 210 includes a plurality of end-to-end side bezels. Of the plurality of side frames of the frame 210, two adjacent side frames intersect, for example, two adjacent side frames are transitionally connected by an arc chamfer. The plurality of side frames includes a top frame 2101 and a bottom frame 2102 disposed opposite each other, and a first side frame 2103 and a second side frame 2104 connected between the top frame 2101 and the bottom frame 2102. The top frame 2101 is a side facing away from the ground when the operator holds the electronic device 1000 toward the front of the electronic device 1000, and the bottom frame 2102 is a side facing toward the ground. The junction between two adjacent side frames is a corner 2106. Wherein top and bottom side frames 2101 and 2102 are parallel and equal. The first side frame 2103 and the second side frame 2104 are parallel and equal. The first side frame 2103 has a length that is greater than the length of the top frame 2101.

In an exemplary embodiment, the bottom frame 2102 is configured with a first slot and a second slot that separate the bottom frame such that a first conductor, a second conductor, and a third conductor are formed on the bottom frame, wherein the first conductor may be connected to a portion of the conductors on the second side frame 2104 to form a first radiator 11, the second conductor forms a second radiator 12, and the third conductor forms a third radiator (not shown) with a portion of the conductors on the first side frame 2103. Wherein a first gap between the first radiator 11 and the second radiator 12 may be used as the coupling gap 110, enabling a capacitive coupling of the first radiator 11 and the second radiator 12. Here, "capacitive coupling" means that an electric field is generated between the first radiator 11 and the second radiator 12, and an excitation signal on the first radiator 11 can be transmitted to the second radiator 12 through the electric field, so that the first radiator 11 and the second radiator 12 can realize electrical signal conduction even in a state of not being in direct contact or not being directly connected.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an antenna assembly 100 according to an embodiment of the application. The antenna assembly 100 includes a first radiator 11, a second radiator 12, a feed F, and a switching circuit 13.

The first radiator 11 and the second radiator 12 are disposed at intervals, a coupling gap 110 is formed between one end of the first radiator 12 and the first radiator 11, a first free end is grounded at the other end of the first radiator 12, a second free end of the first radiator 11 is close to the coupling gap 110, and a second free end of the first radiator 12 is also close to the coupling gap 110, so that the second free end of the first radiator 11 and the second free end of the first radiator 12 are disposed opposite to each other at the coupling gap 110, the first radiator 11 may be grounded at one end far from the coupling gap 110, and the first radiator 12 may be grounded at one end far from the coupling gap 110, so that the first radiator 11 and the first radiator 12 may form a common aperture antenna pair with a pair port.

It will be appreciated that the first radiator 11 may comprise a first free end 111 and a first coupling end 112 arranged at a distance. The first free end 111 may be an end of the first radiator 11 remote from the coupling slit 110, and the first coupling end 112 may be closer to the coupling slit 110 than the first free end 111. The first radiator 11 may be grounded by electrically connecting the first free end 111 with the antenna assembly 100 or the ground GND of the electronic device. Further, the first radiator further has a first connection point D1, wherein the first connection point is located between the first free end 111 and the first coupling end 112 and is disposed adjacent to the coupling slit 110.

It will be appreciated that the second radiator 12 may include a second free end 121 and a second coupling end 122 disposed in spaced apart relation. The second free end 121 may be an end of the first radiator 12 remote from the coupling slit 110, and the second coupling end 122 may be closer to the coupling slit 110 than the second free end 121. Further, the first radiator further has a first connection point D1, wherein the second connection point D2 is located between the second free end 121 and the second coupling end 122 and is disposed adjacent to the coupling slit 110. The second connection point D2 is electrically connected to the ground GND, and the electrical connection manner includes, but is not limited to, direct soldering, or indirect electrical connection through a coaxial line, a microstrip line, a conductive spring, a conductive adhesive, etc.

It will be appreciated that the shape and configuration of the first radiator 11 and the second radiator 12 are not particularly limited in the present application, and the shapes of the first radiator 11 and the second radiator 12 include, but are not limited to, a bar shape, a sheet shape, a rod shape, a coating, a film, and the like. When the first radiator 11 and the second radiator 12 are in a strip shape, the extending track of the second radiator 12 and the third radiator 13 is not limited in the present application, and the first radiator 11 and the second radiator 12 can both extend in a track of straight line, curve, multi-section bending, etc. The radiator can be a line with uniform width on the extending track, or a bar with gradual width change, a widening area and the like and unequal width.

The feed F may be electrically connected to the first radiator 11, for example, the feed F may be electrically connected to the first radiator 11 through a feed point a of the first radiator 11, wherein the feed point a is located between the first coupling end 112 and the first free end 111. The feed F may provide and feed an excitation signal into the first radiator 11, or at least part of the excitation signal may be transmitted in the first radiator 11 and coupled into the second radiator 12 through the coupling slot 110, so that the excitation signal may excite a first resonance mode supporting a first frequency Band in a medium-high frequency (MIDDLE HIGH Band, MHB) Band and a second resonance mode and a third resonance mode supporting a second frequency Band in the MHB Band generated by the first radiator 11 and the second radiator 12.

A switching circuit 13, one end of the switching circuit 13 being electrically connected to the first radiator 11, for example, via a first connection point D1 arranged between the first coupling end 112 and the feed point a, wherein the first connection point D1 is arranged adjacent to the coupling slit 110. The other end of the switching circuit 13 is electrically connected to the ground GND.

Because the excitation signal can be grounded through the switching circuit 13 connected to the first radiator 11, the switching circuit 13 can change the equivalent electrical length of the excitation signal corresponding to the first to third resonance modes, and control the antenna assembly 100 to operate in the first resonance mode, or operate in the second resonance mode and the third resonance mode, so as to achieve the purpose of controlling the antenna assembly 100 to operate in the first frequency band or the second frequency band, and achieve the adjustment of the MHB frequency band currently supported by the antenna assembly 100.

The second resonant mode and the third resonant mode are resonant modes generated by the first excitation signal at the same time and are used for covering the frequency range of the second frequency band.

The antenna assembly 100 provided in the embodiment of the present application uses the first radiator 11 and the second radiator 12 to couple with each other, so that the excitation signal transmitted on the first radiator 11 can be transmitted to the second radiator 12 through the coupling slot 110, and the excitation signal can generate the first resonant mode supporting the first frequency band in the MHB frequency band and the second resonant mode and the third resonant mode supporting the second frequency band in the MHB frequency band on the first radiator 11 and the second radiator 12. The excitation signals for generating the first to third resonance modes can be grounded in the first radiator 11 through the switching circuit 13, so that the switching circuit 13 can change the equivalent electrical lengths of the excitation signals corresponding to the first to third resonance modes, thereby achieving the purpose of controlling the antenna assembly 100 to work in the first frequency band or the second frequency band, and realizing the adjustment of the MHB frequency band currently supported by the antenna assembly 100.

Further, when the adjustment of the MHB frequency band is implemented, only the switching circuit 13 and one cable (cable) for connecting the switching circuit 13 to the first radiator 11 are required, so that the hardware cost is low, the number of elements is small, and the circuit arrangement and the circuit integration are convenient.

Referring to fig. 4 (a), fig. 4 (a) is a schematic diagram of a current distribution of a first resonant mode according to an embodiment of the application. As shown in fig. 4 (a), the first resonant mode is a 1/4 wavelength mode of the first frequency band, and the current of the first resonant mode is distributed to flow from the feeding point a to the second connection point D2.

Referring to fig. 4 (b), fig. 4 (b) is a schematic diagram of a current distribution of a second resonant mode according to an embodiment of the application. The second resonance mode is a 1/4 wavelength mode of the second frequency band, and the current of the second resonance mode flows from the second free end 121 to the second connection point D2;

Referring to fig. 4 (c), fig. 4 (c) is a schematic diagram of a current distribution of a third resonant mode according to an embodiment of the application. The third resonance mode is a 1/2 wavelength mode of the second frequency band, and the current of the third resonance mode is distributed to flow from the first connection point D1 to the feed point A and the second connection point D2 respectively.

As can be seen from the current distributions shown in fig. 4 (a) to fig. 4 (c), the current distributions of the first to third resonant modes are all grounded through the switching circuit 13, so that the switching circuit 13 can change the equivalent electrical lengths of the excitation signals corresponding to the first to third resonant modes, thereby achieving the purpose of controlling the antenna assembly to operate in the first frequency band or the second frequency band, and realizing the adjustment of the MHB frequency band currently supported by the antenna assembly 100.

Further, the first side frame 2103 and the bottom frame 2102 form a corner 2106;

wherein the feeding point a is adjacent to the corner 2106.

When the excitation signal excites the first radiator 11 and the second radiator 12 to generate a first resonance mode, a second resonance mode and a third resonance mode, most of the radiators through which the excitation signal flows are located on the bottom frame 2102, and only pass through a small part of the radiators located on the first side frame 2103, that is, a part of the radiators from a feeding point a to a corner 2106 on the first radiator 11, and because the feeding point a is adjacent to the corner 2106, at least most of equivalent electric lengths corresponding to the first resonance mode, the second resonance mode and the third resonance mode are located on the bottom frame 2102, so that the influence of hands and heads of a human body on the radiation performance of the antenna assembly 1000 when the electronic device 1000 is held is effectively reduced.

Fig. 5 is another schematic structural diagram of the antenna assembly 100 shown in fig. 4. As shown in fig. 5, the switching circuit 13 includes an MHB control unit 131 in which:

The MHB control unit 131 is configured to switch a plurality of first frequency bands supported by the first resonant mode; and/or switching a plurality of second frequency bands supported by the second resonant mode; and/or switching a plurality of second frequency bands supported by the third resonance mode.

Since the first resonant mode generates the frequency range near the center frequency point as the first frequency band, the MHB control unit is configured to change the frequency range supported by the first resonant mode by adjusting the center frequency point of the first resonant mode, so as to switch the plurality of first frequency bands supported by the first resonant mode, so that the antenna assembly 100 generates the required first frequency band by using the first resonant mode.

Similarly, as the second resonant mode generates the frequency range near the center frequency point as the second frequency band, the MHB control unit is configured to change the frequency range supported by the second resonant mode by adjusting the center frequency point of the second resonant mode, so as to switch the plurality of second frequency bands supported by the second resonant mode, so that the antenna assembly 100 generates the required second frequency band by using the second resonant mode.

Similarly, since the third resonant mode generates the frequency range near the center frequency point as the second frequency band, the MHB control unit is configured to change the frequency range supported by the third resonant mode by adjusting the center frequency point of the third resonant mode, so as to switch the plurality of second frequency bands supported by the third resonant mode, so that the antenna assembly 100 generates the required second frequency band by using the third resonant mode.

Fig. 6 is a schematic structural diagram of the MHB control unit 131 shown in fig. 5. As shown in fig. 6, when the MHB control unit 131 is inductive to the MHB frequency band, the resonance frequency of the resonance mode affected by the MHB control unit shifts toward the high frequency direction.

Specifically, the MHB control unit 131 is configured to increase the resonance frequencies of the first resonance mode, the second resonance mode, and the third resonance mode.

The MHB control unit includes a first switching device K1, a first switching leg Q1, and a second switching leg Q2, wherein:

One end of the first switching device K1 is electrically connected to one ends of the first switching branch Q1 and the second switching branch Q2, the other end of the first switching device K1 is electrically connected to the first connection point D1, and the other ends of the first switching branch Q1 and the second switching branch Q2 are both electrically connected to the ground GND; or alternatively

One end of the first switching device K1 is electrically connected to one ends of the first switching branch Q1 and the second switching branch Q2, the other end of the first switching device K1 is electrically connected to the ground GND, and the first switching branch Q1 and the second switching branch Q2 are both electrically connected to the first connection point D1.

Specifically, the first switching device K1 is configured to disconnect the first switching leg Q1 and the second switching leg Q2; or at least one of the first switching leg Q1 and the second switching leg Q2 is gated.

Since the lengths of the first radiator 11 and the second radiator 12 are fixed, different frequency bands in the MHB frequency band can be generated by controlling different switching branches to be in a conductive state, so that the equivalent electrical lengths of the excitation signals corresponding to the MHB control unit 131 are different.

Further, the first frequency band is a B1 frequency band (1920 MHz to 2170 MHz) and a B3 frequency band (1710 MHz to 1880 MHz); the second frequency band is the B40 frequency band (2300 MHz to 2400 MHz) and the B41 frequency band (2496 MHz to 2690 MHz).

From the frequency ranges of the frequency bands, any frequency in the B1 frequency band is larger than any frequency in the B3 frequency band, and any frequency in the B41 frequency band is larger than any frequency in the B40 frequency band.

Based on any frequency in the B1 frequency band being greater than any frequency in the B3 frequency band, when the antenna assembly 100 operates in the first resonant mode, the equivalent electrical length corresponding to the B1 frequency band is greater than the equivalent electrical length corresponding to the B3 frequency band.

When the antenna assembly 100 is operated in the first resonance mode, if the first switching device K1 opens the first switching branch Q1 and the second switching branch Q2, the excitation signal is transmitted only on the first radiator 11 and the second radiator 12, and the MHB control unit 131 does not increase the equivalent electrical length of the excitation signal, the first resonance mode is generated based on the excitation signal from the first radiator 11 and the second radiator 12. Compared with the resonance mode added with the equivalent electrical length corresponding to the MHB control unit, the resonance frequency of the current resonance mode is lower, namely the antenna component works in the B3 frequency band.

Similarly, when the antenna assembly 100 is operated in the first resonant mode, if the first switching device K1 is used to gate the first switching branch, the excitation signal can be transmitted through the first radiator 11 and the second radiator 12 and can flow through the elements in the first switching branch Q1, so that the first resonant mode is generated by the excitation signal based on the equivalent electrical lengths of the first radiator 11 and the second radiator 12 and the first switching branch Q1. Compared with the resonance mode without increasing the equivalent electrical length corresponding to the MHB control unit, the resonance frequency of the current resonance mode is higher, namely the antenna component works in the B1 frequency band.

As can be seen from comparing the equivalent electrical lengths of the B3 band and the B1 band, although the transmission lengths of the excitation signal in the first radiator 11 and the second radiator 12 are the same, the MHB control unit increases the equivalent electrical length corresponding to the first switching branch Q1 by controlling the first switching branch to be turned on, so that the first resonant mode can support the B3 band and also support the B1 band.

Based on any frequency in the B41 frequency band being greater than any frequency in the B40 frequency band, when the antenna assembly 100 operates in the second resonant mode, the equivalent electrical length corresponding to the B41 frequency band is greater than the equivalent electrical length corresponding to the B40 frequency band.

When the antenna assembly 100 is operated in the second resonant mode, if the first switching device K1 is used to gate the first switching branch, the excitation signal can be transmitted through the second radiator 12 and can flow through the elements in the second switching branch Q2, so that the second resonant mode is generated by the excitation signal based on the equivalent electrical lengths corresponding to the second radiator 12 and the second switching branch Q2, that is, the antenna assembly 100 is operated in the B40 frequency band.

Similarly, when the antenna assembly 100 is operated in the second resonant mode, if the first switching device K1 gates the first switching leg Q1 and the second switching leg Q2, the excitation signal can be transmitted on the second radiator 12 and can flow through the elements in the first switching leg Q1 and the second switching leg Q2, so that the second resonant mode is generated based on the equivalent electrical lengths of the second radiator 12 and the first switching leg Q1 and the second switching leg Q2, that is, the antenna assembly 100 is operated in the B41 band.

As can be seen from comparing the equivalent electrical lengths of the B40 band and the B41 band, although the transmission length of the excitation signal in the second radiator 12 is the same and the equivalent electrical length corresponding to the second switching branch Q2 is the same, the MHB control unit increases the equivalent electrical length corresponding to the first switching branch Q1 by controlling the first switching branch Q1 to be turned on, so that the second resonant mode can support the B40 band and also support the B41 band.

Based on the same principle as the second resonant mode, if the first switching device K1 is used to gate the first switching branch Q1 when the antenna assembly 100 is operated in the third resonant mode, the excitation signal can be transmitted on the first radiator 11 and the second radiator 12 and can flow through the elements in the second switching branch Q2, so that the third resonant mode is generated based on the equivalent electrical lengths corresponding to the first radiator 11 and the second radiator 12 and the second switching branch Q2, i.e. the antenna assembly 100 is operated in the B40 band.

Similarly, when the antenna assembly 100 operates in the third resonant mode, if the first switching device K1 gates the first switching leg Q1 and the second switching leg Q2, the excitation signal can be transmitted through the first radiator 11 and the second radiator 12 and can flow through the elements in the first switching leg Q1 and the second switching leg Q2, so that the third resonant mode is generated by the excitation signal based on the equivalent electrical lengths corresponding to the first radiator 11, the second radiator 12, the first switching leg Q1 and the second switching leg Q2, that is, the antenna assembly 100 operates in the B41 frequency band.

As can be seen from comparing the equivalent electrical lengths of the B40 band and the B41 band, although the transmission lengths of the excitation signal in the first radiator 11 and the second radiator 12 are the same, and the equivalent electrical lengths corresponding to the second switching branch are the same, the MHB control unit increases the equivalent electrical length corresponding to the first switching branch Q1 by controlling the first switching branch Q1 to be turned on, so that the third resonant mode can support the B40 band and also support the B41 band.

Optionally, the excitation signal is further configured to excite the first radiator 11 to generate a fourth resonant mode supporting a third frequency Band in a Low Band (LB) frequency Band.

Since the antenna assembly 100 can operate in both MHB and LB frequency bands, the frequency coverage of the antenna assembly is improved.

Fig. 7 is a schematic diagram of current distribution of a fourth resonant mode according to an embodiment of the present application. As shown in fig. 7, the fourth resonant mode is a 1/4 wavelength mode of the third frequency band, and the current of the fourth resonant mode is distributed to flow from the feeding point a to the first free end 111.

As can be seen from the current distribution shown in fig. 7, the current distribution of the fourth resonant mode of the antenna assembly 100 for generating the LB frequency band is located between the feeding point a and the first free end 111, and the current distribution of the first to third resonant modes of the MHB frequency band is located between the feeding point a and the second connection point D2, so that there is no overlap between the current distribution areas, and a better isolation is provided, so that the antenna assembly can better support the MHB frequency band and the LB frequency band.

The excitation signals for generating the first to fourth resonance modes are all grounded on the first radiator 11 through the switching circuit 13 connected to the first radiator 11, so that the switching circuit 13 can change the equivalent electrical length of the excitation signals corresponding to the first to fourth resonance modes, control the antenna assembly 100 to work in the first resonance mode, or work in the second resonance mode and the third resonance mode, or work in the fourth resonance mode, and achieve the purpose of controlling the antenna assembly to work in the first frequency band, the second frequency band or the third frequency band, and achieve the adjustment of the MHB frequency band or the LB frequency band currently supported by the antenna assembly.

Fig. 8 is a schematic diagram of another structure of the antenna assembly shown in fig. 3. As shown in fig. 8, the switching circuit 13 includes an LB control unit 132 in which:

The LB control unit 132 is configured to switch a plurality of third frequency bands supported by the fourth resonant mode.

Since the fourth resonant mode generates the frequency range near the center frequency point as the third frequency band, the LB control unit 132 is configured to change the frequency range supported by the fourth resonant mode by adjusting the center frequency point of the fourth resonant mode, so as to switch the plurality of third frequency bands supported by the fourth resonant mode, so that the antenna assembly 100 generates the required third frequency band by using the fourth resonant mode.

Fig. 9 is a schematic diagram of the structure of the LB control unit 132 shown in fig. 8. As shown in fig. 10, when the LB control unit 132 is capacitive to the LB frequency band to be applied, the resonance frequency of the resonance mode to be affected by the capacitive resonance frequency shifts in the low frequency direction.

Specifically, the LB control unit 132 is configured to control the resonance frequency of the fourth resonance mode to be reduced.

The LB control unit 132 includes a second switching device K2, a third switching branch Q3, and a fourth switching branch Q4, where equivalent electrical lengths of the third switching branch Q3 and the fourth switching branch Q4 corresponding to each other under the action of an excitation signal are different;

one end of the second switching device K2 is electrically connected to one ends of the third switching branch Q3 and the fourth switching branch Q4, the other end of the second switching device K2 is electrically connected to the first connection point D1, and the other ends of the third switching branch Q3 and the fourth switching branch Q4 are electrically connected to the ground GND; or alternatively

One end of the second switching device K2 is electrically connected to one ends of the third switching branch Q3 and the fourth switching branch Q4, the other end of the second switching device K2 is electrically connected to the ground GND, and the third switching branch Q3 and the fourth switching branch Q4 are both electrically connected to the first connection point D1.

Specifically, the first switching device K1 is configured to disconnect the third switching leg Q3 and the fourth switching leg Q4; or at least one of the three switching leg Q3 and the fourth switching leg Q4 is gated.

Wherein the third switching leg Q3 can be reduced by a larger amount than the fourth switching leg Q4.

Because the third switching branch Q3 or the fourth switching branch Q4 can reduce the amplitude differently, the switching of the required fourth frequency band can be completed by using the third switching branch Q3 or the fourth switching branch Q4 alone.

Since the length of the first radiator 11 is fixed, different frequency bands in the LB frequency band can be generated by controlling different switching branches to be in a conductive state, so that the equivalent electrical lengths of the excitation signals corresponding to the LB control unit 132 are different.

Further, the third frequency band is a B28 frequency band (703 MHz to 803 MHz) or a B20 frequency band (791 MHz to 862 MHz) or a B5 frequency band (824 MHz to 894 MHz) or a B8 frequency band (880 MHz to 960 MHz).

As can be seen from the frequency ranges of the frequency bands, the frequency range of the B20 frequency band is partially overlapped with the frequency range of the B5 frequency band, any frequency of the B20 frequency band or the B5 frequency band is larger than any frequency of the B28 frequency band, and any frequency of the B20 frequency band or the B5 frequency band is smaller than any frequency of the B8 frequency band.

When the antenna assembly 100 operates in the fourth resonance mode, if the second switching device K2 turns off the third switching branch Q3 and the fourth switching branch Q4, the excitation signal is transmitted only on the first radiator 11, and the LB control unit 132 does not reduce the equivalent electrical length of the excitation signal, the fourth resonance mode is generated based on the first radiator 11. Compared with the equivalent electrical length of the fourth resonant mode reduced by the corresponding equivalent electrical length of the LB control unit, the resonant frequency of the current resonant mode is higher, i.e. the antenna assembly works in the B8 frequency band.

When the antenna assembly 100 is operated in the fourth resonant mode, if the second switching device K2 gates the third switching branch Q3 or the fourth switching circuit Q4, the excitation signal can be transmitted on the first radiator 11 and can also flow through the elements in the third switching branch Q3 or the fourth switching circuit Q4, so that the fourth resonant mode is generated by subtracting the equivalent electrical length corresponding to the third switching branch Q1 or the fourth switching circuit Q4 from the excitation signal based on the remaining equivalent electrical length of the first radiator 11. The resonance frequency of the current resonance mode is lower than the equivalent electrical length of the fourth resonance mode reduced by the corresponding equivalent electrical length of the LB control unit.

Further, since the third switching leg Q3 can be lowered by a larger magnitude than the fourth switching leg Q4. The third resonant mode of gating the third switching leg supports a lower frequency, i.e., when the second switching device K2 gates the third switching leg Q3, the antenna assembly 100 operates in the B28 band, and when the second switching device K2 gates the fourth switching leg Q4, the antenna assembly 100 operates in the B20 and B5 bands.

Referring to fig. 10, fig. 10 is a schematic diagram of another structure of an antenna assembly 100 according to an embodiment of the application. As shown in fig. 10, the second radiator 12 further has a third connection point D3 disposed between the second coupling end 122 and the second connection point D2, wherein the third connection point D3 is electrically connected to the ground GND.

By adding the third connection point D3, the excitation signal can be grounded through the second connection point D2, and the current distribution mode of the excitation signal can be increased through the third connection point D3, so that the resonance mode generated by exciting the second radiator 12 by the excitation signal is further increased, and more frequency bands in the MHB frequency band can be supported.

Referring to fig. 11, fig. 11 is a schematic diagram of another structure of an antenna assembly 100 according to an embodiment of the application. As shown in fig. 11, the antenna assembly 100 further includes a tuning circuit 14. One end of the tuning circuit 14 is electrically connected to the second connection point D2, and the other end of the tuning circuit is electrically connected to the ground GND, so as to tune the first resonant mode, the second resonant mode and the third resonant mode, so as to assist in improving the radiation performance of the antenna assembly 100.

Referring to fig. 12, fig. 12 is a schematic diagram of the tuning circuit 14 shown in fig. 11. The tuning circuit 14 comprises a third switching device K3, a first tuning branch T1 and a second tuning branch T2; wherein:

The first tuning branch T1 is used for tuning the first frequency band;

A second tuning branch T2, configured to tune a second frequency band;

One end of the third switching device K3 is electrically connected to one ends of the first tuning branch T1 and the second tuning branch T2, the other end of the third switching device K3 is electrically connected to the second connection point D2, and the other ends of the first tuning branch T1 and the second tuning branch T2 are both electrically connected to the ground GND; or alternatively

One end of the third switching device K3 is electrically connected to one ends of the first tuning branch T1 and the second tuning branch T2, the other end of the third switching device K3 is electrically connected to the ground GND, and the first tuning branch T1 and the second tuning branch T2 are both electrically connected to the second connection point D2.

Specifically, the third switching device K3 is configured to gate the first tuning branch T1 and the second tuning branch T2.

The third switching device K3 controls the different tuning branches to be in a conducting state, so that the excitation signal generates different resonance modes to perform adaptive tuning operation, thereby assisting in improving the radiation performance of the antenna assembly 100.

In practical applications, a suitable tuning element is selected for the tuning circuit 14 according to the range of different frequency bands. The application is not limited to the specific parameters of the tuning elements in the tuning circuit 14. Those skilled in the art can select tuning elements having appropriate parameters based on the concepts of the present application in combination with specific configurations.

Referring to fig. 13, fig. 13 is a schematic diagram of S parameters of an antenna assembly 100 according to an embodiment of the application. As shown in fig. 13, the 1 st mark point is the resonance frequency of B28, wherein the resonance frequency of the antenna assembly 100 in the B28 band is 0.7625ghz, and the s parameter is-4.1192; the 2 nd mark point is the resonance frequency of B20, wherein the resonance frequency of the antenna component 100 in the B20 frequency band is 0.82498GHz, and the S parameter is-7.2998; the 3 rd mark point is the resonance frequency of B5, wherein the resonance frequency of the antenna assembly 100 in the B5 frequency band is 0.85859GHz, and the S parameter is-7.7463; the 4 th mark point is the resonance frequency of B8, wherein the resonance frequency of the antenna assembly 1000 in the B8 frequency band is 0.9025GHz, and the S parameter is-23.059; the 5 th mark point is the resonance frequency of B3, wherein the resonance frequency of the antenna assembly 1000 in the B3 frequency band is 1.8328GHz, and the S parameter is-13.288; the 6 th mark point is the resonance frequency of B1, wherein the resonance frequency of the antenna assembly 100 in the B1 frequency band is 2.096GHz, and the S parameter is-16.667; the 7 th mark point is the resonance frequency of B40, wherein the resonance frequency of the antenna assembly 100 in the B40 frequency band is 2.397GHz, and the S parameter is-13.994; the 8 th mark point is the resonance frequency of B41, wherein the resonance frequency of the antenna assembly 1000 in the B41 frequency band is 2.5382ghz, and the s parameter is-11.154.

In the return loss curve, the absolute value of the retrieval wave loss value (S parameter) is 5dB or more (for example only, and not as a limitation of the return loss value for higher efficiency of the present application) as a reference value having higher electromagnetic wave transmission/reception efficiency. And taking a set of frequencies with absolute values of return loss values greater than or equal to 5dB in one resonant mode as a frequency band supported by the resonant mode.

As can be seen from fig. 13, the antenna assembly is capable of supporting the B28, B20, B5 and B8 bands in the LB band, while supporting the B3, B1, B40 and B41 bands in the MHB band. In addition, as can be seen from the graph shown in fig. 10, the antenna assembly can also generate higher order modes of the LB frequency band around 3 GHz.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.

Claims

1. An antenna assembly, comprising:

The feed source is electrically connected to the first radiator through a feed point and is used for providing an excitation signal, and the excitation signal is also used for exciting the first radiator and the second radiator to generate a first resonance mode supporting a first frequency band in a middle-high frequency MHB band, a second resonance mode supporting a second frequency band in the MHB band and a third resonance mode;

2. An antenna assembly according to claim 1, wherein:

the first resonance mode is a 1/4 wavelength mode of a first frequency band, and the current of the first resonance mode flows from the feed point to the second connection point;

The second resonance mode is a 1/4 wavelength mode of a second frequency band, and the current of the second resonance mode flows from a second free end to a second connection point;

The third resonance mode is a 1/2 wavelength mode of the second frequency band, and the current of the third resonance mode is distributed to flow from the first connection point to the feed point and the second connection point respectively.

3. The antenna assembly of claim 1, wherein the switching circuit comprises:

The MHB control unit is used for switching a plurality of first frequency bands supported by the first resonance mode; and/or switching a plurality of second frequency bands supported by the second resonant mode; and/or switching a plurality of second frequency bands supported by the third resonance mode.

4. An antenna assembly according to claim 3, wherein the MHB control unit comprises a first switching device, a first switching leg and a second switching leg, wherein:

one end of the first switching device is electrically connected with one end of the first switching branch and one end of the second switching branch, the other end of the first switching device is electrically connected with the first connecting point, and the other ends of the first switching branch and the second switching branch are electrically connected with a reference ground; or alternatively

One end of the first switching device is electrically connected with one end of the first switching branch and one end of the second switching branch, the other end of the first switching device is electrically connected with a reference ground, and the first switching branch and the second switching branch are both electrically connected with the first connecting point;

the first switching branch and the second switching branch are used for increasing the resonance frequency of the first resonance mode, the second resonance mode and the third resonance mode;

The first switching device is used for switching off the first switching branch and the second switching branch; or at least one of the first switching leg and the second switching leg is gated.

5. An antenna assembly as in claim 4, wherein:

the first frequency band is a B1 frequency band and a B3 frequency band;

The second frequency band is a B40 frequency band and a B41 frequency band.

6. An antenna assembly as in claim 5, wherein:

the first switching device is used for disconnecting the first switching branch and the second switching branch when the antenna assembly works in a first resonance mode, so that the antenna assembly works in a B3 frequency band;

the first switching device is used for gating the first switching branch when the antenna assembly works in a first resonance mode so as to generate the first resonance mode, so that the antenna assembly works in a B1 frequency band;

The first switching device is used for gating the second switching branch when the antenna assembly works in the second resonance mode and the third resonance mode, so that the antenna assembly works in the B40 frequency band;

The first switching device is used for gating the first switching branch and the second switching branch when the antenna assembly works in the second resonance mode and the third resonance mode, so that the antenna assembly works in the B41 frequency band.

7. An antenna assembly according to claim 1, wherein:

the excitation signal is also used to excite the first radiator to generate a fourth resonant mode supporting a third one of the low frequency LB bands.

8. An antenna assembly as in claim 7, wherein:

The fourth resonance mode is a 1/4 wavelength mode of the third frequency band, and current of the fourth resonance mode flows from the feed point to the first free end.

9. An antenna assembly as in claim 7, wherein:

the switching circuit is further configured to control the antenna assembly to operate in one of the first frequency band, the second frequency band, and the third frequency band.

10. The antenna assembly of claim 9, wherein the switching circuit comprises:

And the LB control unit is used for switching a plurality of third frequency bands supported by the fourth resonance mode.

11. The antenna assembly of claim 10, wherein the LB control unit comprises a second switching device, a third switching leg, and a fourth switching leg, wherein:

one end of the second switching device is electrically connected with one ends of the third switching branch and the fourth switching branch, the other end of the second switching device is electrically connected with the first connecting point, and the other ends of the third switching branch and the fourth switching branch are electrically connected with a reference ground; or alternatively

One end of the second switching device is electrically connected with one ends of a third switching branch and a fourth switching branch, the other end of the second switching device is electrically connected with a reference ground, and the third switching branch and the fourth switching branch are both electrically connected with the first connecting point;

The third switching branch and the fourth switching branch are both used for reducing the resonance frequency of the fourth resonance mode, and the amplitude of the third switching branch which can be reduced is larger than that of the fourth switching branch;

The second switching device is used for switching off the third switching branch and the fourth switching branch or gating one of the third switching branch and the fourth switching branch.

12. An antenna assembly as in claim 11, wherein:

the third frequency band is a B28 frequency band or a B20 frequency band or a B5 frequency band or a B8 frequency band.

13. An antenna assembly as in claim 12, wherein:

the second switching device is used for disconnecting the third switching branch and the fourth switching branch when the antenna assembly works in a fourth resonance mode, so that the antenna assembly works in a B8 frequency band;

The second switching device is used for gating the third switching branch when the antenna assembly works in a fourth resonance mode, so that the antenna assembly works in a B28 frequency band;

The second switching device is used for gating the fourth switching branch when the antenna assembly works in the fourth resonance mode, so that the antenna assembly works in the B20 frequency band and the B5 frequency band.

14. An antenna assembly according to claim 1, wherein:

The second radiator also has a third connection point disposed between the second coupling end and the second connection point, wherein the third connection point is electrically connected to ground.

15. An antenna assembly according to claim 1, wherein:

And one end of the tuning circuit is electrically connected with the second connection point, and the other end of the tuning circuit is electrically connected with the reference ground and is used for tuning the first resonance mode, the second resonance mode and the third resonance mode.

16. An electronic device, comprising:

an antenna assembly as claimed in any one of claims 1 to 15;

The middle frame comprises a top frame, a bottom frame and two side frames, wherein the top frame and the bottom frame are oppositely arranged;

the second radiator is located at the bottom frame, one part of the first radiator is located at the bottom frame, and the other part of the first radiator is located at the side frame.

17. The electronic device of claim 16, wherein:

The side frames and the bottom frames form corner parts;

wherein the feed point is adjacent to the corner portion such that equivalent electrical lengths corresponding to the first, second, and third resonant modes are at least mostly located at the bottom frame.