WO2017020425A1

WO2017020425A1 - Antenna and mobile terminal

Info

Publication number: WO2017020425A1
Application number: PCT/CN2015/091356
Authority: WO
Inventors: 李克
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2015-07-31
Filing date: 2015-09-30
Publication date: 2017-02-09
Also published as: CN105552516B; CN105552516A

Abstract

Disclosed in an embodiment of the invention are an antenna and mobile terminal. The antenna comprises: a metal trace configured to adjust a resonant frequency of the antenna, located inside a mobile terminal, connected to and electrically connected to a closed-loop metal center frame of the mobile terminal not having a breakpoint, and electrically connected, via a power feed point, to a circuit board in the mobile terminal, wherein the circuit board is located between a metal structure-supporting plate in the mobile terminal and a metal back cover of the mobile terminal, and the metal structure-supporting plate is connected to and electrically connected to the metal back cover. The metal structure-supporting plate and the metal back cover serve as reference grounds of the mobile terminal. The closed-loop metal center frame not having a breakpoint serves as a radiator of the antenna to emit and receive signals. The invention enables a mobile terminal to use a closed-loop metal center frame not having a breakpoint and a metal back cover, ensuring radiation performance of an antenna.

Description

Antenna and mobile terminal

Technical field

The present invention relates to the field of communications technologies, and in particular, to an antenna and a mobile terminal.

Background technique

As the user's requirements for the appearance of the mobile terminal continue to increase, the design of the metal case of the mobile phone is very attractive to the user with its special feel, texture and metallic color. Therefore, more and more metal appearance mobile terminals appear on the market.

However, in order to avoid the blocking of the signal of the mobile phone by the closed conductor, the metal middle frame of most mobile terminals has a plastic partition point, and only a few metal terminals of the mobile terminal are closed loop without a break point. The existing mobile terminals that have been used in the frame without breakpoints often use ring or slot antennas, and do not support metal back covers, such as application number 201310472716.7 (wireless electronic device with metal perimeter including multiple antennas) And 201310126183.7 (slot antenna device and mobile terminal of mobile terminal), although satisfying the requirement of no metal break in the appearance of the middle frame, it cannot meet the requirement of the metal back cover, and only utilizes the simple realization of the slot antenna, that is, The metal frame is opened at the periphery of the frame. This implementation needs to change the slot size to adjust the antenna resonance frequency, which is not flexible enough. Moreover, the radiation performance of the slot antenna is relatively weak, and the design of the slot in the middle frame is also strong. Will have a more obvious weakening effect.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide an antenna and a mobile terminal. To solve the problem of mobile terminal requirements for metal design and antenna performance.

In order to solve the above technical problem, an embodiment of the present invention provides an antenna, including:

a metal trace, located inside the mobile terminal, connected to the closed-loop non-breakpoint metal middle frame of the mobile terminal and electrically connected, and electrically connected to a circuit board in the mobile terminal through a feeding point for adjusting the antenna Resonant frequency, wherein the circuit board is located between the structural support metal plate in the mobile terminal and the metal back cover of the mobile terminal, and the structural support metal plate is connected to the metal back cover and electrically connected. The structural support metal plate and the metal back cover serve as a reference ground for the mobile terminal;

The closed loop non-breakpoint metal middle frame is used as a radiator of the antenna to transmit and receive signals.

Wherein the metal trace includes a first tuning portion for causing an operating frequency band of the antenna to cover a low frequency band, and a second tuning portion for causing the antenna The working frequency band covers the high frequency band.

The trace length and/or width of the first tuning portion and the second tuning portion are different.

The metal traces included in the first tuning portion and the second tuning portion are all arranged in a loop.

Wherein, the metal trace is disposed at a bottom of the mobile terminal that is away from a location where the earpiece is located.

The metal trace is made of stainless steel, copper, nickel-plated copper or gold-plated copper.

An embodiment of the present invention further provides a mobile terminal, including the antenna as described above.

Embodiments of the present invention have the following beneficial effects:

The whole antenna consists of a closed-loop non-breakpoint metal middle frame and a metal trace. The structure supported by the mobile terminal supports the metal plate and the metal back cover as the reference ground for the mobile terminal. The closed-loop non-breakpoint metal middle frame and the structural support metal plate are physically connected. And electrically conductive, so the closed-loop non-breakpoint metal middle frame is also part of the reference ground. The closed-loop non-breakpoint metal middle frame acts as the main antenna radiator, and the metal trace adjusts the resonant frequency by changing the size and shape. Thereby, the metal appearance design of the closed-loop non-breakpoint metal middle frame and the metal back cover is realized, and the radiation performance of the antenna is ensured, and the structural strength of the mobile terminal body is greatly improved; and the feeding structure is simple in design, and the metal wiring is passed through The adjustment can achieve flexible adjustment of the resonant frequency.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a perspective view of an antenna structure of the present invention;

Figure 2 is a plan view showing the structure of the antenna of the present invention;

Figure 3 is a graph showing the results of a return loss test using the antenna of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, instead of All embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The specific composition and connection relationship of the antenna of the embodiment of the present invention will be described below with reference to FIG. 1 and FIG. 2, and the antenna performance is tested by the return loss test of FIG.

1 is a perspective view of an antenna structure according to the present invention. In this embodiment, the antenna includes:

The metal trace 100 is located inside the mobile terminal, is connected to the closed loop non-breakpoint metal middle frame 200 of the mobile terminal, and is electrically connected, and is electrically connected to the circuit board in the mobile terminal through a feeding point (not shown in FIG. 1). a connection for adjusting a resonant frequency of the antenna, wherein the circuit board is located between the structural support metal plate 300 in the mobile terminal and the metal back cover 400 of the mobile terminal, and the structure supports the metal plate 300 Connecting and electrically conducting with the metal back cover 400, the structure supporting the metal plate 300 and the metal back cover 400 as a reference ground of the mobile terminal; the metal back cover 400 may cover the back of some or all of the mobile terminals .

The closed loop non-breakpoint metal middle frame 200 is used to transmit and receive signals as a radiator of the antenna.

The mobile terminal may be a smart phone or a tablet computer with a communication function.

Optionally, the metal trace 100 can be divided into two tuning sections, and the shape and size of the metal trace 100 can be adjusted to cover a plurality of frequency bands, such as low frequency 1, low frequency 2, low frequency 3, and high frequency 1. High frequency 2 and high frequency 3, etc. Of course, it is even possible to divide the metal trace 100 into two or more tuning sections, which respectively correspond to different frequency bands.

Alternatively, in terms of the shape of the tuning portion, in addition to the connection point with other components, the metal traces included in each of the tuning portions may be arranged in a loop. Therefore, the internal space of the mobile terminal can be fully saved, and the loop can be set as a loop, or can be set as a curved loop. Of course, it can also be set to other shapes, such as a long strip, a triangle, etc., and it is only necessary to ensure that coverage of different frequency bands can be achieved within a certain space. In terms of the size of the tuning portion, specifically, the length and the width may be included, and the shape and size of the tuning portion may be adjusted to cover the band to be covered. In order to meet the performance requirements of various network standards of mobile terminals in the future, the specific settings of the shape and size of the tuning unit can be tested and tested. This makes it possible to adjust the resonant frequency very flexibly.

Optionally, the metal trace 100 is disposed at a bottom of the mobile terminal that is away from a location where the earpiece is located. It should be noted that the bottom here refers to the user facing the ground when the mobile terminal is normally held. One end, and the earpiece is generally placed on top of the mobile terminal. By indicating the current test of the mobile terminal, it is found that the low frequency and the high frequency indicate that the current is mainly distributed on the closed-loop non-breakpoint metal middle frame 200 and the metal trace 100. Since the metal trace is designed at the bottom of the mobile terminal in this embodiment The current distribution of the user's hand-held part on the two sides of the closed-loop non-breakpoint metal middle frame 200 is less, so the current loss is small when the user holds the mobile terminal, and the influence on the antenna performance is less; similarly, since the antenna is located at the bottom, the user When the mobile terminal picks up or makes a call, the part that sticks to the human ear is the top of the mobile terminal, and the bottom of the current distribution is small, so the hand loss of the mobile terminal using the antenna according to the embodiment of the present invention is The loss of the signal and the head loss (the loss of the head signal to the antenna when the ear is on the phone) are relatively small, and the losses of the left and right hands and the left and right heads are relatively balanced, which can well meet the ever-increasing demand for the antenna performance of the mobile terminal. .

Optionally, the material of the metal trace 100 may include, but is not limited to, stainless steel, copper, nickel-plated copper or gold-plated copper.

The connection relationship between the antenna and other components of the mobile terminal will be described in detail below with reference to FIG.

2 is a schematic plan view of an antenna structure according to the present invention. In this embodiment, the antenna includes:

The metal trace 100 is located inside the mobile terminal, is connected to the closed loop non-breakpoint metal middle frame 200 of the mobile terminal, and is electrically connected, and is electrically connected to the circuit board in the mobile terminal through the feeding point 104 for adjustment. a resonant frequency of the antenna, wherein the circuit board is located between a structural support metal plate in the mobile terminal and a metal back cover of the mobile terminal, and the structural support metal plate is connected to the metal back cover Conductively conducting, the structural support metal plate and the metal back cover as a reference ground of the mobile terminal;

Specifically, the metal trace 100 may include a first tuner section 101 and a second tuner section 102, the first tuner section 101 is configured to cover an operating frequency band of the antenna to cover a low frequency band, and the second tuner section 102 It is used to make the working frequency band of the antenna cover a high frequency band.

The metal traces included in the first tuning portion 101 and the second tuning portion 102 are all arranged in a loop.

The trace length and/or width of the first tuning portion 101 and the second tuning portion 102 may be different when the resonant frequency is adjusted to cover the high frequency and the low frequency. Or you can resonate by the shape of both The frequency adjustment, of course, can also adjust the size and shape of both.

In the present embodiment, the first tuner section 101 and the second tuner section 102 are respectively connected to the closed loop non-breakpoint metal middle frame 200 through the connection point 103. The feed point 104 is disposed on the second tuning portion 102 and is connected to the circuit board of the mobile terminal through a feeder.

The metal trace 100 is disposed at a bottom of the mobile terminal that is away from a location where the earpiece is located.

In this embodiment, the entire antenna is composed of a closed-loop non-breakpoint metal middle frame 200 and a metal trace 100. The closed-loop non-breakpoint metal middle frame 200 serves as a main antenna radiator, and the metal trace 100 is adjusted by changing the size and shape. Resonant frequency. The structural support metal plate 300 and the metal back cover 400 built in the mobile terminal serve as a reference ground for the mobile terminal, and the closed-loop non-breakpoint metal middle frame 200 and the structural support metal plate are physically connected and electrically connected, so the closed-loop non-breakpoint metal middle frame 200 is also a part of the reference ground. The working principle of the antenna is the ground radiation theory (the present invention proposes a new radiation theory), that is, using a partial reference ground (closed-loop non-breakpoint metal middle frame 200) as the main radiator of the antenna, The antenna resonant frequency is adjusted using metal traces 100. Thereby, the metal appearance design of the closed-loop non-breakpoint metal middle frame and the metal cover is realized, and the radiation performance of the antenna is ensured, and the structural strength of the mobile terminal body is greatly improved; and the feeding structure is simple in design, and the metal wiring is passed through The adjustment can achieve flexible adjustment of the resonant frequency; the metal trace is placed at the bottom of the mobile terminal, which can reduce the hand loss and head loss of the mobile terminal, and the hand loss of the left and right hands is relatively balanced.

After the above connection and setting, the return loss test can be performed on the mobile terminal using the antenna described in this embodiment.

Please refer to FIG. 3, which is a schematic diagram showing the results of return loss testing using the antenna of the present invention.

Return loss is a parameter indicating the reflection performance of a signal. Return loss indicates that a portion of the incident power is reflected back to the source. For example, if 1mW (0dBm) of power is injected into the amplifier, 10% of which is reflected (bounced back), the return loss is 10dB. From a mathematical point of view, the return loss is -10 lg [(reflected power) / (incident power)]. Return loss is usually specified on both the input and output. Although it is called loss, the larger the value, the better the performance.

As shown in Fig. 3, the abscissa is the frequency and the ordinate is the return loss. For the low frequency 1, high frequency 1, high frequency 2 and high frequency 3 tests, the absolute value of the return loss is about 10 or more. The performance is better, which can fully meet the requirements of the antenna performance of the mobile terminal.

It should be noted that each embodiment in the present specification is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and the same similar parts between the various embodiments. You can refer to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

Through the description of the above embodiments, the present invention has the following advantages:

The whole antenna consists of a closed-loop non-breakpoint metal middle frame and a metal trace. The structure supported by the mobile terminal supports the metal plate and the metal back cover as the reference ground for the mobile terminal. The closed-loop non-breakpoint metal middle frame and the structural support metal plate are physically connected. And electrically conductive, so the closed-loop non-breakpoint metal middle frame is also part of the reference ground. The closed-loop non-breakpoint metal middle frame acts as the main antenna radiator, and the metal trace adjusts the resonant frequency by changing the size and shape. Thereby, the metal appearance design of the closed-loop non-breakpoint metal middle frame and the metal back cover is realized, and the radiation performance of the antenna is ensured, and the structural strength of the mobile terminal body is greatly improved; and the feeding structure is simple in design, and the metal wiring is passed through The adjustment can achieve flexible adjustment of the resonant frequency; the metal trace is placed at the bottom of the mobile terminal, which can reduce the hand loss and head loss of the mobile terminal, and the hand loss of the left and right hands is relatively balanced.

One of ordinary skill in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and thus equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims

An antenna characterized by comprising:

a metal trace, located inside the mobile terminal, connected to the closed-loop non-breakpoint metal middle frame of the mobile terminal and electrically connected, and electrically connected to a circuit board in the mobile terminal through a feeding point for adjusting the antenna Resonant frequency, wherein the circuit board is located between the structural support metal plate in the mobile terminal and the metal back cover of the mobile terminal, and the structural support metal plate is connected to the metal back cover and electrically connected. The structural support metal plate and the metal back cover serve as a reference ground for the mobile terminal;

The closed loop non-breakpoint metal middle frame is used as a radiator of the antenna to transmit and receive signals.
The antenna of claim 1 wherein said metal trace comprises a first tuning portion and a second tuning portion, said first tuning portion for causing an operating frequency band of said antenna to cover a low frequency band, said The second tuning portion is configured to cause the operating frequency band of the antenna to cover the high frequency band.
The antenna according to claim 1, wherein said first tuning portion and said second tuning portion have different trace lengths and/or widths.
The antenna according to claim 3, wherein the metal traces included in the first tuning portion and the second tuning portion are both disposed in a loop.
The antenna according to any one of claims 1 to 4, wherein the metal trace is disposed at a bottom of the mobile terminal that is away from a portion where the earpiece is located.
The antenna according to claim 5, wherein the metal trace is made of stainless steel, copper, nickel plated copper or gold plated copper.
A mobile terminal, characterized in that the mobile terminal comprises the antenna according to any of claims 1-6.