WO2023115958A1

WO2023115958A1 - Multi-band antenna and terminal

Info

Publication number: WO2023115958A1
Application number: PCT/CN2022/109680
Authority: WO
Inventors: 许晓军
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-12-24
Filing date: 2022-08-02
Publication date: 2023-06-29
Also published as: CN216773507U

Abstract

Provided are a multi-band antenna and a terminal. The multi-band antenna comprises an inverted-F antenna, a coupling antenna and a switch. The inverted-F antenna comprises a feed branch, a grounding branch and a radiator, the feed branch being connected to one end of the radiator, and the grounding branch being connected to the position of the end, away from the radiator, of the radiator. The coupling antenna comprises a coupling grounding circuit and a coupling radiator, the coupling grounding circuit serving as one end of the coupling antenna, the coupling radiator serving as the other end of the coupling antenna, and signal coupling between the inverted-F antenna and the coupling antenna is conducted by means of the coupling radiator and the radiator of the inverted-F antenna. The switch is arranged between the coupling grounding circuit of the coupling antenna and a grounding point.

Description

A kind of multi-band antenna and terminal

Cross References to Related Applications

This application claims priority to the following patent application filed on December 24, 2021: Chinese patent application entitled "A Multi-Band Antenna and Terminal" with application number CN202123297970.7, the entire contents of which are incorporated by reference In this article.

technical field

Embodiments of the present disclosure relate to but not limited to the communication field, and specifically, relate to but not limited to a multi-band antenna and terminal.

Background technique

During the antenna debugging process of mobile phones, since there are often many metal devices around the antenna, such as SPK (speaker), MIC (microphone), camera, etc., and these metal devices often have a relatively large impact on the performance of the antenna, so in the antenna It is often necessary to avoid these metal devices during the debugging process.

Contents of the invention

According to one aspect of the present disclosure, a multi-band antenna is provided. The multi-band antenna includes: an inverted-F antenna, a coupling antenna and a switch, wherein the inverted-F antenna includes a feeding branch, a grounding branch and a radiator, and the feeding branch is connected to one end of the radiator , the grounding branch is connected to the radiator at a position away from the one end of the radiator; the coupling antenna includes a coupling ground circuit and a coupling radiator, and the coupling ground circuit serves as one end of the coupling antenna , the coupling radiator is used as the other end of the coupling space, and the signal coupling between the inverted-F antenna and the coupling antenna is performed through the coupling radiator and the radiator of the inverted-F antenna; and the The switch is arranged between the coupled ground circuit of the coupled antenna and a ground point.

According to another aspect of the present disclosure, a terminal is provided. The terminal includes the above-mentioned multi-band antenna.

Description of drawings

FIG. 1 is a schematic structural diagram of a multi-band antenna provided by an embodiment of the present disclosure; and

FIG. 2 is a schematic diagram of an equivalent circuit structure of a multi-band antenna in four states provided by an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below through specific implementation manners in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present disclosure, not to limit the present disclosure.

on the one hand. As the antenna space is getting smaller and smaller, many antennas cannot avoid metal devices, making it difficult to improve antenna performance. On the other hand, in the 5G era, the frequency bands of antennas have increased a lot, and the antenna bandwidth needs to be wider, and the coupling branch can only couple part of the frequency bands.

in related technologies. By adjusting antenna routing and matching to optimize antenna performance, the antenna environment of the current project is becoming more and more complex, and the requirements for antenna frequency bands are also increasing, so antenna debugging is very difficult, and it is difficult to ensure that all frequency bands can achieve the desired results.

In order to solve the problem that the current internal design of the terminal has serious interference to the antenna, and at the same time require the antenna to match more frequency bands, the antenna becomes more and more complex, the anti-interference ability of the antenna becomes worse, and the performance of the antenna decreases. According to this In one aspect of the disclosure, this embodiment provides a multi-band antenna, and the multi-band antenna includes: an inverted-F (Inverted-F Antenna, IFA) antenna, a coupling antenna, and a switch. The branch at the top of the IFA antenna (that is, the branch connected to one end of the radiator of the IFA antenna) is a feed branch, and the branch below the top (that is, the branch connected to the above-mentioned end of the radiator away from the radiator) The branch of the position) is the grounding branch. One end of the coupling antenna is a coupling ground circuit (that is, the coupling ground circuit serves as one end of the coupling antenna), and the other end is a coupling radiator (ie, the coupling radiator serves as the other end of the coupling antenna). The coupling radiator performs signal coupling with the radiator of the IFA antenna. The switch is arranged between the coupling grounding circuit of the coupling antenna and a grounding point, and is used for controlling the grounding state of the coupling antenna.

Please refer to FIG. 1 , which is a schematic structural diagram of a multi-band antenna provided in this embodiment. The multi-band antenna includes: IFA antenna 10, coupling antenna 20 and switch 30, the IFA antenna is an inverted F antenna, the branch at its top is the feeding branch 101, and the branch below the top is the grounding branch 102; one end of the coupling antenna For coupling grounding circuit 201, the other end is coupling radiator 202, and coupling radiator 202 carries out signal coupling with radiator 103 of IFA antenna; The ground state of the coupled antenna 20.

In another embodiment, the multi-band antenna further includes a capacitor and/or an inductor connected to the switch for adjusting the coupling frequency band of the coupled antenna.

In another embodiment, the multi-band antenna is a mobile network antenna.

In another embodiment, the length of the coupling radiator of the coupling antenna is shorter than the length of the radiator of the IFA antenna. The length of the coupling radiator 202 of the coupling antenna 20 and the length of the radiator 103 of the IFA antenna 10 are shown in FIG. 1 .

In another embodiment, the coupling antenna is an L antenna, which is arranged outside the IFA antenna. The shape of the coupling antenna 20 is as shown in FIG. 1 .

In another embodiment, the coupling radiator of the coupling antenna is arranged parallel to the radiator of the IFA antenna. The arrangement relationship between the coupling radiator 202 of the coupling antenna 20 and the radiator 103 of the IFA antenna 10 can be referred to FIG. 1 .

In another embodiment, when the switch is in the off state, the multi-band antenna is coupled to a higher (first) frequency band signal; when the switch is in the on state, the multi-band antenna is coupled to a lower (first) frequency band signal; Second) the signal of the frequency band.

A multi-band antenna provided by an embodiment of the present disclosure includes: an IFA antenna, a coupling antenna, and a switch; the IFA antenna is an inverted-F antenna, the branch at its top is a feeding branch, and the branch below the top is a grounding branch One end of the coupling antenna is a coupling grounding circuit, and the other end is a coupling radiator, and the coupling radiator and the radiator of the IFA antenna perform signal coupling; the switch is arranged between the coupling grounding circuit and the coupling antenna of the coupling antenna Between the grounding points, it is used to control the grounding state of the coupling antenna. The grounding state of the coupling antenna is controlled by setting a switch in the grounding circuit of the coupling antenna, so that the coupling branch can be in four states respectively, and these four states can respectively couple four different frequency bands of the antenna, thus increasing the simultaneous support of the antenna The number of frequency bands reduces the complexity of antenna design, broadens antenna bandwidth, and improves antenna performance.

Here, the multi-band antenna shown in Figure 1 is used to illustrate the various working states of the multi-band antenna. An antenna switch is added between the coupling ground circuit and the ground point of the coupling antenna, so that the coupling antenna can be in four states, four The equivalent circuit structure of the state is shown in Figure 2. These four states can respectively couple four different frequency bands of the antenna. When the switch is in the NA state, the antenna coupling branch (coupling antenna) becomes a separate suspended part. In this state, the current distribution on the antenna coupling branch is weak and can be coupled to higher frequency bands. . The switch is grounded, the coupling branch is directly grounded, the coupling performance is strong, and the corresponding lower frequency band can be coupled. In the grounded state, the switch path is connected to different inductances/capacitors to change the coupling length and realize the change of the coupling frequency band. The antenna coupling has been upgraded from coupling a single frequency band to multi-band coupling, thereby broadening the antenna bandwidth, improving antenna performance, and increasing the market competitiveness of the project.

This embodiment also provides a terminal (not shown in the figure), which includes the above-mentioned multi-band antenna.

The above content is a further detailed description of the embodiments of the present disclosure in conjunction with specific implementation modes, and it cannot be assumed that the specific implementation of the present disclosure is limited to these descriptions. For those of ordinary skill in the technical field to which the present disclosure belongs, without departing from the concept of the present disclosure, some simple deductions or substitutions can be made, which should be deemed to belong to the protection scope of the present disclosure.

Claims

A multi-band antenna, including: an inverted F antenna, a coupling antenna and a switch, wherein,

The inverted-F antenna includes a feeding branch, a grounding branch and a radiator, the feeding branch is connected to one end of the radiator, and the grounding branch is connected to an end of the radiator that is far away from the radiator. the position of said one end of;

The coupling antenna includes a coupling ground circuit and a coupling radiator, the coupling ground circuit is used as one end of the coupling antenna, and the coupling radiator is used as the other end of the coupling sky and ground, and the coupling radiator is connected to the The radiator of the inverted-F antenna performs signal coupling between the inverted-F antenna and the coupling antenna; and

The switch is disposed between the coupled ground circuit of the coupled antenna and a ground point.
The multi-band antenna according to claim 1, further comprising a capacitor and/or an inductor connected to the switch for adjusting the coupling frequency band of the coupled antenna.
The multi-band antenna according to claim 1, wherein the multi-band antenna is a mobile network antenna.
The multi-band antenna according to claim 1, wherein the length of the coupling radiator of the coupling antenna is shorter than the length of the radiator of the inverted-F antenna.
The multi-band antenna according to claim 1, wherein the coupling antenna is an L antenna and is arranged outside the inverted F antenna.
The multi-band antenna according to claim 1, wherein the coupling radiator of the coupling antenna is arranged parallel to the radiator of the inverted-F antenna.
The multi-band antenna according to claim 1, wherein, when the switch is in the off state, the multi-band antenna is coupled to a signal of the first frequency band; when the switch is in the on state, the multi-band antenna is coupled to the first frequency band For signals in two frequency bands, the frequency of the signal in the first frequency band is greater than the frequency of the signal in the second frequency band.
A terminal, comprising the multi-band antenna according to any one of claims 1-7.