CN220456656U

CN220456656U - Antenna structure and electronic equipment

Info

Publication number: CN220456656U
Application number: CN202322139154.6U
Authority: CN
Inventors: 程俊淇; 付超; 刘家荣
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2023-08-09
Filing date: 2023-08-09
Publication date: 2024-02-06
Anticipated expiration: 2033-08-09

Abstract

The present disclosure relates to an antenna structure and an electronic device. The antenna structure comprises: a radiator comprising an upper frame point; the metal elastic sheet is connected with the upper frame point; a feed source; the matching circuit is electrically connected with the feed source at one end; the metal matching wire is electrically connected with the other end of the matching circuit and the metal elastic sheet, and the length of the metal matching wire is positively correlated with the wavelength of the central frequency point of the target radiation range of the radiator.

Description

Antenna structure and electronic equipment

Technical Field

The disclosure relates to the technical field of terminals, and in particular relates to an antenna structure and electronic equipment.

Background

Currently, in order to reduce the loss of the antenna signal, a matching network is generally configured between the feed end and the radiator to realize impedance matching, so as to improve the radiation efficiency of the antenna.

Disclosure of Invention

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

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

a radiator comprising an upper frame point;

a metal spring plate connected with the upper frame point

A feed source;

the matching circuit is electrically connected with the feed source at one end;

the metal matching wire is electrically connected with the other end of the matching circuit and the metal elastic sheet, and the length of the metal matching wire is positively correlated with the wavelength of the central frequency point of the target radiation range of the radiator.

Optionally, the length of the metal matching wire ranges from 0.03 λ to 0.2λ, where λ is the wavelength of the central frequency point of the target radiation range.

Optionally, the length of the metal matching wire is 0.05λ.

Optionally, at least part of the metal matching wire is arranged in a bending shape;

or, the metal matching wire is at least partially arranged in a curve shape;

or, the metal matching wire is at least partially arranged in a line segment shape.

Optionally, the metal matching wire includes a main body wire and at least one branch wire, the main body wire is connected with the matching circuit and the metal elastic sheet, the branch wire extends outwards from the main body wire, and the length of the metal matching wire is the length of the main body wire.

Optionally, the metal matching wires are suspended.

Optionally, the metal matching wire is arranged on the surface of the insulating piece, or the insulating piece coats the metal matching wire.

Optionally, the feed source, the metal elastic sheet and the matching circuit are all arranged on the circuit board;

and part of the copper foil layer of the circuit board forms the metal matching wire.

Optionally, the matching circuit includes at least one of an inductance and a capacitance.

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

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

according to the embodiment, the antenna structure is provided, one end of the metal matching wire is arranged between the matching circuit and the upper frame point, and the metal matching wire and the matching circuit are mixed and matched, so that compared with a traditional active matching mode, a change-over switch is not needed, cost reduction is facilitated, compared with a traditional broadband matching mode, the metal matching wire is utilized for mixing and matching, and under the condition of compact space in electronic equipment, the negative influence of the upper frame point position selection on radiation performance can be overcome by utilizing the metal matching wire, and the radiation performance of the antenna structure is facilitated to 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 disclosure and together with the description, serve to explain the principles of the disclosure.

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

Fig. 2 is an illustration of an initial smith chart with and without metal transmission conductors.

Fig. 3 is a graph showing a simulation of radiation efficiency with and without metal transmission wires.

Fig. 4 is a schematic diagram illustrating a metal delivery according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying 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 or all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these 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 "at … …" or "responsive to a determination", depending on the context.

In general, the same radiator of an electronic device may cover a plurality of frequency bands to reduce the number of radiators of the electronic device. For the multi-frequency radiator, the related art can perform impedance matching on the multi-frequency radiator by the following scheme:

in some related art, a change-over switch may be used to optimize different tuning elements on the radiator, so that the current mode on the radiator may be changed, thereby realizing effective radiation in different frequency bands. However, the large size of the switch is disadvantageous for the extremely stacking environment in the electronic device.

In other related technologies, impedance matching of the multi-frequency antenna can be achieved through a passive matching mode, a change-over switch is not needed in the passive matching mode in the scheme, and impedance matching is achieved through discrete devices such as an inductor and a capacitor. However, in the scheme, due to the lack of a change-over switch, the matching flexibility is low, the upper frame point position of the radiator has a large influence on the matching effect, and the clearance condition which can be provided for the antenna in the electronic equipment is limited, so that the selection of the upper frame point position is limited, the matching difficulty of the multi-frequency antenna is high, and the radiation performance of the multi-frequency antenna is necessarily influenced under the condition that the clearance condition is limited and the upper frame point position condition is strictly conflicting.

Based on this, this disclosure provides an antenna structure, this antenna structure is through setting up one end metal match wire between matching circuit and last frame point, carries out mixed matching through metal match wire and matching circuit, for traditional active matching mode, need not to adopt change over switch, is favorable to reduce cost, for traditional broadband matching mode, utilizes metal match wire to carry out mixed matching, under the compact condition of electronic equipment inner space, can overcome the negative influence of last frame point position selection to radiation performance by utilizing metal match wire, is favorable to promoting antenna structure's radiation performance.

As shown in fig. 1, the antenna structure comprises a radiator 1, a metal spring 2, a feed source 3, a matching circuit 4 and a metal matching wire 5, wherein the radiator 1 comprises an upper frame point 11, one end of the matching circuit 4 is connected with the feed source 3, the other end is connected with the metal matching wire 5, one end of the metal matching wire 5, deviating from the matching circuit 4, is connected with the metal spring 2, the metal spring 2 is connected with the upper frame point 11, the feed source 3 can be connected to the upper frame point 11 of the radiator 1 through the series matching circuit 4, the metal matching wire 5 and the metal spring 2, and impedance matching is realized through the metal matching wire 5 and the matching circuit 4. The matching circuit 4 may include at least one of an inductance and a capacitance, the inductance may be parallel or serial to the radiator 1, and the capacitance may be parallel or serial to the radiator 1, and may be specifically designed adaptively according to matching requirements.

The length of the metal matching wire 5 is positively correlated with the wavelength of the center frequency point of the radiation frequency band of the radiator 1. In other words, the longer the wavelength of the center frequency point of the target radiation range of the radiator 1, the longer the length design of the metal matching wire 5 can be, so as to realize the hybrid matching of the metal matching wire 5 and the matching circuit 4, on the other hand, even though the matching circuit in the conventional technology needs to realize the connection with the radiator through the wire, in order to reduce the metal loss in the conventional technical scheme, the wire design connected between the matching circuit and the radiator is often short enough, in other words, the length of the wire can be shortest in the equipment space regardless of the radiation frequency band of the radiator in the conventional technology, in the technical scheme disclosed in the utility model, the radiation performance of the radiator 1 is proposed to be mixed and matched through the metal matching wire 5 and the matching circuit 4, the influence on the radiation performance is overcome by the metal matching wire by overcoming the position selection of the upper frame point, so as to improve the radiation performance of the antenna structure, and the metal loss caused by the metal matching wire 5 is relatively small or even negligible. The target radiation range is understood to mean a frequency range in which one or more resonances can subsequently be formed by matching, so that the multiband coverage of the radiator 1 is achieved.

In some embodiments, the length of the metal matching wire 5 ranges from 0.03 λ to 0.2λ, where λ is the wavelength of the center frequency point of the target radiation range. For example, the length of the metal matching wire 5 may be 0.05λ. It can be seen that the length of the metal match conductors 5 is still in fact relatively short compared to the wavelength, and therefore the surface area of the metal match conductors 5 is small, although a reverse current can be formed on the radiator 1 on the metal match conductors 5, the losses caused by the small surface area of the metal match conductors 5 can also be expected to be small, and this negative effect can be neglected in engineering design.

In some embodiments, at least a portion of the metal match wire 5 may be provided in a bent shape, or at least a portion of the metal match wire 5 may be provided in a curved shape, or at least a portion of the metal match wire 5 may be provided in a line segment shape. Alternatively, the same metal matching wire 5 may include various shape portions, for example, the same metal matching wire 5 may include a bent portion and a curved portion, and other shape combinations may exist, which will not be described in detail herein. Based on the different shape designs of the metal matching wire 5, it is advantageous to match limited environmental conditions within the electronic device.

Taking the target radiation range of the radiator 1 as an example, the length of the metal matching wire 5 is 0.05λ, λ is the wavelength of the central frequency point in the frequency range of 1.7GHz-2.7GHz, and the antenna structure is subjected to software simulation assuming that the metal matching wire 5 is a line segment, so as to obtain the initial smith loop of the antenna structure shown in fig. 2. As shown in fig. 2, S1 represents an initial smith loop of the antenna structure in which the metal matching wire 5 is not provided, S2 represents an initial smith loop of the antenna structure in which the metal matching wire 5 is provided, and comparing the smith loops shown in S1 and S2, it can be seen that the smith loop of the antenna structure in which the metal matching wire 5 is provided in the present disclosure is relatively convergent, and thus the difficulty in designing the matching circuit 4 is reduced thereafter, and the matching flexibility is improved.

As shown in fig. 3, a curve S3 shows a radiation efficiency curve of the antenna structure in which the metal matching wire 5 is not disposed within 1.7GHz-2.7GHz, and a curve S4 shows a radiation efficiency curve of the antenna structure in which the metal matching wire 5 is disposed within 1.7GHz-2.7 GHz. Comparing the curve S3 with the curve S4, it can be seen that the radiation performance of the antenna structure can be improved by providing the metal matching wire 5 in the frequency range of 1.7GHz-2.7 GHz.

In the above embodiments, the metal matching wire 5 is a wire structure with only two ends, and in other embodiments, as shown in fig. 4, the metal matching wire 5 includes a main wire 51 and at least one branch wire 52, where the main wire 51 connects the matching circuit 4 and the metal dome 2, and the branch wire 52 may extend outwards from the main wire 51, and the length of the metal matching wire 5 in the above embodiments may be understood as the length of the main wire 51. By designing the branch conductor 52, the current mode of the metal matching conductor 5 can be increased, which is beneficial to reducing the matching difficulty of the antenna structure.

In the technical scheme of the disclosure, the metal matching wire 5 is arranged in a suspending manner, that is, no other conductive devices are arranged in a set distance around the metal matching wire 5, so that a good clearance environment can be provided for the metal matching wire 5.

Optionally, the metal matching wire 5 may be a common metal wire, and in order to implement suspension arrangement of the metal matching wire 5, the antenna structure further includes an insulating member, the metal matching wire 5 may be disposed on a surface of the insulating member, and suspension arrangement of the metal matching wire 5 is implemented through the insulating member and surrounding air; if there are more peripheral devices, the metal matching wire 5 is covered by an insulating member, for example, the metal matching wire 5 is covered by the insulating member to reduce the influence of the peripheral devices on the metal matching wire 5.

Alternatively, the antenna structure further comprises a circuit board, the feed source 3, the metal spring plate 2 and the matching circuit 4 can be arranged on the circuit board, the metal matching wire 5 can be formed through wiring of the circuit board, and suspension arrangement of the metal matching wire 5 is achieved through plastic base materials of the circuit board. Based on this, the metal matching wire 5 is formed by using the circuit board process without additional molding, which is advantageous in reducing the production cost.

Based on the technical scheme of the disclosure, an electronic device is further provided, and the electronic device may include the antenna structure described in any one of the embodiments. The radiator 1 of the antenna structure may be a part of a frame of the electronic device.

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 adaptations, uses, or adaptations of the disclosure following the general 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 is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected 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:

a radiator comprising an upper frame point;

the metal elastic sheet is connected with the upper frame point;

a feed source;

the matching circuit is electrically connected with the feed source at one end;

2. The antenna structure of claim 1, wherein the length of the metal matching wire ranges from 0.03 λ to 0.2 λ, where λ is the wavelength of the center frequency point of the target radiation range.

3. The antenna structure of claim 2, wherein the length of the metal matching wire is 0.05λ.

4. The antenna structure of claim 1, wherein the metal matching wire is at least partially bent;

or, the metal matching wire is at least partially arranged in a curve shape;

5. The antenna structure of claim 1, wherein the metal matching wire comprises a main body wire and at least one branch wire, the main body wire connects the matching circuit and the metal spring, the branch wire extends outwards from the main body wire, and the length of the metal matching wire is the length of the main body wire.

6. The antenna structure of claim 1, wherein the metal matching wire is suspended.

7. The antenna structure of claim 1, further comprising an insulator, wherein the metal matching wire is disposed on a surface of the insulator, or wherein the insulator encapsulates the metal matching wire.

8. The antenna structure of claim 1, further comprising a circuit board, wherein the feed, the metal dome, and the matching circuit are all disposed on the circuit board;

9. The antenna structure of claim 1, wherein the matching circuit comprises at least one of an inductance and a capacitance.

10. An electronic device comprising an antenna structure according to any of claims 1-9.