CN113036433B

CN113036433B - Antenna structure and electronic device

Info

Publication number: CN113036433B
Application number: CN201911249894.7A
Authority: CN
Inventors: 刘会; 王静松
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2022-08-19
Anticipated expiration: 2039-12-09
Also published as: CN113036433A

Abstract

The present disclosure relates to an antenna structure and an electronic device. The antenna structure includes: the metal frame radiator and the non-metal frame radiator are arranged adjacently; one end of the first feed point is grounded, and the other end of the first feed point is connected to the nonmetal frame radiator; the first feed point is arranged close to a grounding point of the metal frame radiator.

Description

Antenna structure and electronic device

Technical Field

The present disclosure relates to the field of terminal technologies, and in particular, to an antenna structure and an electronic device.

Background

As a new generation of communication protocol standard, 5G (5th generation mobile networks) technology has gradually started to enter the public. Since the electronic device needs to be compatible with a 5G communication frequency band, an antenna radiator needs to be added to the electronic device on the basis of the existing model. The problem of how to arrange the antenna radiators reasonably in a limited space and how to reduce the influence of coupling between adjacent antenna radiators has thus become an intermediate difficulty for the skilled person.

Disclosure of Invention

The present disclosure provides an antenna structure and an electronic device to solve the disadvantages of the related art.

According to a first aspect of embodiments of the present disclosure, there is provided an antenna structure, comprising:

the metal frame radiator and the non-metal frame radiator are arranged adjacently;

one end of the first feed point is grounded, and the other end of the first feed point is connected to the nonmetal frame radiator;

the first feed point is arranged close to a grounding point of the metal frame radiator.

Optionally, the radiation frequency bands of the metal frame radiator and the non-metal frame radiator are close to or the same.

Optionally, the metal frame radiator includes a first metal frame radiator and a second metal frame radiator, and a first end of the first metal frame radiator and a first end of the second metal frame radiator are close to each other;

the isolation rib is positioned between the first end part of the first metal frame radiator and the first end part of the second metal frame radiator, and the first metal frame radiator and the second metal frame radiator are grounded through the isolation rib;

wherein the first feed point is arranged close to the isolation rib.

Optionally, the non-metal frame radiator is located near the first end of the first metal frame radiator and the first end of the second metal frame radiator.

Optionally, the first metal frame radiator includes a first antenna branch and a second antenna branch bent relative to the first antenna branch and connected to the first antenna branch, and the second antenna branch forms a first end of the first metal frame radiator;

the second metal frame radiator and the second antenna branch extend towards the same direction to form the antenna.

Optionally, the antenna structure further includes a second feed point connected to the first metal frame radiator, a third feed point connected to the second metal frame radiator, and a matching circuit;

the matching circuit comprises a grounding circuit and a feed-in circuit, one end of the grounding circuit is grounded, the other end of the grounding circuit is connected to a radiator of the antenna structure, the feed-in circuit comprises a first feed-in circuit, a second feed-in circuit and a third feed-in circuit, the first feed-in circuit is connected with the first feed point and the non-metal frame radiator, the second feed-in circuit is connected with the second feed point and the first metal frame radiator, and the first feed-in circuit and the second feed-in circuit can be selected to respectively comprise at least one of a capacitor and an inductor.

Optionally, the grounding circuit includes an inductor and a capacitor connected in parallel.

Optionally, the non-metal frame radiator includes a laser forming antenna.

According to a second aspect of embodiments of the present disclosure, there is provided an electronic device comprising an antenna structure as described in any one of the embodiments above.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

according to the embodiment, when the metal frame radiator and the nonmetal frame radiator are arranged adjacently, the current on the metal frame radiator is weaker near the ground point, so that the feed point of the nonmetal frame radiator can be arranged near the ground point, the coupling influence between the metal frame radiator and the nonmetal frame radiator can be reduced, and the isolation between the metal frame radiator and the nonmetal frame radiator can be improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic diagram illustrating an antenna structure according to an exemplary embodiment.

Fig. 2 is a graph illustrating an S-parameter of an antenna structure according to an exemplary embodiment.

Fig. 3 is a schematic diagram illustrating another antenna structure according to an example embodiment.

Fig. 4 is a graph illustrating an S-parameter of another antenna structure in accordance with an exemplary embodiment.

Fig. 5 is a schematic diagram illustrating a configuration of a matching circuit according to an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

As a new generation of communication protocol standard, 5G (5th generation mobile networks, fifth generation mobile communication technology) technology has gradually started to enter the public domain. Although the 5 technology is gradually applied to the smart terminal, in order to adapt the smart terminal to more complex application scenarios, the electronic device is generally compatible with multiple communication modes, namely 2G, 3G, 4G and 5G. However, in order to implement the new 5G communication technology and the communication frequency band compatible with the 5G technology, the number of antennas needs to be increased in the electronic device, which presents a new challenge to the layout of the antenna structure in the electronic device.

Currently, a metal frame radiator has become a mainstream trend in antenna structure design, but in order to meet the coverage requirement of a frequency band, a non-metal frame radiator, such as a Laser-Direct-structuring (LDS) antenna, may also need to be designed in an electronic device. However, it can be understood that, the space in the electronic device is limited, and how to improve the isolation between the non-metal frame radiator and the metal frame radiator to avoid affecting the performance of the antenna structure under the condition that the non-metal frame radiator and the metal frame radiator are located close to each other to reasonably utilize the limited space is a technical problem that needs to be solved at present.

Accordingly, the present disclosure provides an antenna structure 100 as shown in fig. 1. In order that the antenna structure 100 may include the metal frame radiator 1 and the non-metal frame radiator 2 which are adjacently disposed, in order that the antenna signal on the metal frame radiator 1 may be repeatedly radiated to the outside of the electronic device configured with the antenna structure 100, an antenna slot may be further disposed on the metal frame radiator 1, and a position and a specification of the antenna slot may be designed as needed, which is not limited by the present disclosure. The non-metallic antenna 2 may be a laser formed antenna obtained by using a laser forming technique. In order to arrange the metal frame radiator 1 and the non-metal frame radiator 2 in a limited space, the metal frame radiator 1 and the non-metal frame radiator 2 may be adjacent to each other.

Further, the antenna structure 100 may further include a first feed point 3, where one end of the first feed point 3 is grounded, and the other end is connected to the non-metal antenna 2, so as to implement connection between the non-metal antenna 2 and a feed line. The metal bezel radiator 1 may be grounded via a grounding point 4 as shown in fig. 1, and the first feed point 3 is arranged in the vicinity of the grounding point 4. Therefore, the current on the metal frame radiator 1 is weaker near the ground point 4, and the strongest current point of the non-metal frame radiator 2 is arranged near the ground point 4, so that the coupling influence between the metal frame radiator 1 and the non-metal frame radiator 2 can be reduced, and the isolation between the metal frame radiator 1 and the non-metal frame radiator 2 is improved. Wherein the first feed point 3 is arranged near the ground point 4 it is to be understood that the first feed point 3 is located within a circle having a radius of 5mm-10mm from the ground point 4. Especially, when the radiation frequency bands of the metal frame radiator 1 and the non-metal frame radiator 2 are close to or the same as each other, for example, when both the metal frame radiator 1 and the non-metal frame radiator 2 are used for radiating 2.2GHz, or the frequency difference of signals radiated by the metal frame radiator 1 and the non-metal frame radiator 2 is within a range of 500MHz, the isolation between the metal frame radiator 1 and the non-metal frame radiator 2 can be significantly improved, and the performance of the antenna can be improved.

In order to support the beneficial effects of the above embodiments, as shown in the S-parameter curve diagram of the antenna structure 100 shown in fig. 2, a curve S1 in fig. 2 is an input return loss curve of the non-metal frame radiator 2, a curve S2 is an input return loss curve of the metal frame radiator 2, and a curve S3 is an isolation curve between the metal frame radiator 1 and the non-metal frame radiator 2, as seen from the curve S3, the isolation between the metal frame radiator 1 and the non-metal frame radiator 2 reaches-20 dB or less, and there is no strong mutual interference between the metal frame radiator 1 and the non-metal frame radiator 2, and the mutual independence is good.

In this embodiment, the number of the metal frame radiators 1 may be one or more, and similarly, the number of the non-metal frame radiators 2 may also be one or more. For example, as shown in fig. 3, the metal bezel radiator 1 may include a first metal bezel radiator 11 and a second metal bezel radiator 12, and a first end 111 of the first metal bezel radiator 11 and a first end 121 of the second metal bezel radiator 12 are close to each other. Further, the antenna structure 100 may further include an isolation rib 5, the isolation rib 5 may be located between the first end 111 of the first metal frame radiator 11 and the first end 121 of the second metal frame radiator 12, and the first metal frame radiator 11 and the second metal frame radiator 12 may be grounded through the isolation rib 5, and the first feed point 3 of the non-metal frame radiator 2 may be disposed near the isolation rib 4. The frequencies of the antennas radiated by the first metal frame radiator 11, the second metal frame radiator 12 and the non-metal frame radiator 2 may be close to or the same.

Based on the antenna structure 100 shown in fig. 3, referring to the S-parameter graph shown in fig. 4, S11 is an input return loss curve of the first metal bezel radiator 11, i.e., the curve S4 shown in fig. 4; curve S22 is the input return loss curve for the second metal bezel radiator 12, i.e., curve S5 shown in fig. 4; the curve S33 is the input return loss curve of the non-metal bezel radiator 1, i.e., the curve S6 shown in fig. 4. S13 and S31 represent the isolation between the first metal bezel radiator 11 and the non-metal bezel radiator 2, and since the two are equal, the curve S7 in fig. 4 can be obtained; s23 and S32 indicate the isolation between the second metal bezel radiator 12 and the non-metal bezel radiator 2, and since the two are equal, the curve S8 in fig. 4 can be obtained; s12 and S21 indicate the isolation between the first metal bezel radiator 11 and the second metal bezel radiator 12, and since the two radiators are equal, the curve S9 in fig. 4 can be obtained. As can be seen from the curve in fig. 4, the isolation between each two antennas is below-17 dB, and it can be seen that the isolation between the antennas can be improved by disposing the first feed point 3 of the non-metal frame radiator 2 at the position of the isolation rib 5 between the first metal frame radiator 11 and the second metal frame radiator 12.

In this embodiment, as shown in fig. 3, in order to reduce the trace length between the non-metal bezel radiator 2 and the first feed point 3, the non-metal bezel radiator 2 may be located near the first end 111 of the first metal bezel radiator 11 and the first end 112 of the second metal bezel radiator 12. That is, the non-metal frame radiator 2 may be disposed close to the clearance area corresponding to the first metal frame radiator 11 and the clearance area corresponding to the second metal frame radiator 12.

In an embodiment, still referring to fig. 3, the first metal frame radiator 11 may include a first antenna branch 112 and a second antenna branch 113, the second antenna branch 113 may be bent relative to the first antenna branch 112 and connected to the first antenna branch 112, the second antenna branch 113 may form the first end 111 of the first metal frame radiator 11, and the second metal frame radiator 12 and the second antenna branch 112 extend in the same direction, that is, the second metal frame radiator 12 and the second antenna branch 112 may be substantially located on the same straight line, for example, may be located on a side edge of the metal frame, so as to increase the length of the radiator of the antenna structure 100, which is beneficial to widening the operating frequency band of the antenna structure 100.

In this embodiment, as shown in fig. 5, the antenna structure 100 may further include a second feed point 6 connected to the first metal frame radiator 11, a third feed point 7 connected to the second metal frame radiator 12, and a matching circuit 8, where the matching circuit 8 may include a ground circuit 81 and a feed circuit 82, one end of the ground circuit 81 is grounded, and the other end of the ground circuit 81 is connected to the radiator (one of the first metal frame radiator 11, the second metal frame radiator 12, and the non-metal frame radiator 2) of the antenna structure 100, and as shown in fig. 5, the ground circuit 8 may include an inductor and a capacitor connected in parallel. Of course, only the parallel inductor and capacitor are used as an example for illustration, and other inductors or capacitors may be included, which is not illustrated here.

The feeding circuit 82 may include a first feeding circuit 821, a second feeding circuit 822, and a third feeding circuit 823, where the first feeding circuit 821 is connected to the first feeding point 3 and the non-metal frame radiator 2, the second feeding circuit 822 is connected to the second feeding point 6 and the first metal frame radiator 11, and the third feeding circuit 823 is connected to the third feeding point 7 and the second metal frame radiator 12. The first feed circuit 821, the second feed circuit 822 and the third feed circuit 823 are used to adjust the resonance of the non-metal frame radiator 2, the first metal frame radiator 11 and the second metal frame radiator 12, respectively, so as to achieve multi-band coverage of the antenna structure 100.

Still referring to fig. 5, the first feed circuit 821 and the second feed circuit 822 may respectively include at least one of an inductor and a capacitor. As shown in fig. 5, the first feeding circuit 821 may include an inductor having one end connected to the ground and the other end connected between the first feeding point 3 and the non-metal frame radiator 2; the second feeding circuit 822 may include a plurality of inductors and a plurality of capacitors, wherein the plurality of inductors are all connected between the first metal frame radiator 11 and the second feeding point 6, one capacitor is connected in parallel with any inductor, and the other capacitor is connected in parallel with ground. Of course, other circuit connections for the second feeding circuit 822 may exist, which are not illustrated here. The third feed circuit 823 may be a feed line connecting the third feed point 7 and the second metal bezel radiator 12, or may also include at least one of a capacitor or an inductor. The circuit connection manner of the first feed-in circuit 821, the second feed-in circuit 822 and the third feed-in circuit 823, the capacitance value of the capacitor, and the inductance value of the inductor can be designed as required according to the working frequency band to be radiated by each radiator.

The present disclosure also provides an electronic device comprising the antenna structure 100 of any of the above embodiments. The electronic device may include a mobile phone terminal, a tablet terminal, a smart home, and the like, which is not limited by the disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An antenna structure, comprising:

the metal frame radiator and the nonmetal frame radiator are arranged adjacently;

the first feed point is arranged close to a grounding point of the metal frame radiator;

the metal frame radiator comprises a first metal frame radiator and a second metal frame radiator, and the first end of the first metal frame radiator is close to the first end of the second metal frame radiator;

wherein the first feed point is arranged close to the isolation rib.

2. The antenna structure of claim 1, wherein the radiation frequency bands of the metal bezel radiator and the non-metal bezel radiator are close to or the same.

3. The antenna structure of claim 1, wherein the non-metal bezel radiator is located near a first end of the first metal bezel radiator and a first end of the second metal bezel radiator.

4. The antenna structure of claim 1, wherein the first metal bezel radiator comprises a first antenna stub and a second antenna stub bent with respect to the first antenna stub and connected to the first antenna stub, the second antenna stub forming a first end of the first metal bezel radiator;

5. The antenna structure of claim 1, further comprising a second feed connected to the first metal bezel radiator, a third feed connected to the second metal bezel radiator, and a matching circuit;

the matching circuit comprises a grounding circuit and a feed-in circuit, one end of the grounding circuit is grounded, the other end of the grounding circuit is connected to the radiator of the antenna structure, the feed-in circuit comprises a first feed-in circuit, a second feed-in circuit and a third feed-in circuit, the first feed-in circuit is connected with the first feed point and the non-metal frame radiator, the second feed-in circuit is connected with the second feed point and the first metal frame radiator, and the third feed-in circuit is connected with the third feed point and the second metal frame radiator.

6. The antenna structure of claim 5, wherein the first feed-in circuit and the second feed-in circuit each comprise at least one of a capacitor and an inductor.

7. The antenna structure according to claim 5, characterized in that the grounding circuit comprises an inductance and a capacitance in parallel.

8. The antenna structure of claim 1, wherein the non-metallic bezel radiator comprises a laser formed antenna.

9. An electronic device, characterized in that it comprises an antenna structure according to any of claims 1-8.