WO2018058300A1

WO2018058300A1 - Terminal housing and terminal

Info

Publication number: WO2018058300A1
Application number: PCT/CN2016/100324
Authority: WO
Inventors: 郑超
Original assignee: 北京小米移动软件有限公司
Priority date: 2016-09-27
Filing date: 2016-09-27
Publication date: 2018-04-05
Also published as: CN106663865B; CN106663865A

Abstract

Provided are a terminal housing and a terminal, which relate to the technical field of terminals. The terminal housing comprises: a back cover (11), an antenna bracket (12) arranged in the inner side of the back cover (11), and a PCB board (13) arranged inside the terminal housing. The antenna bracket (12) is located between the back cover (11) and the PCB board (13) and is provided with an antenna unit. The antenna unit comprises a first branch (121) and a second branch (122). A first via hole (1211) is provided in the first branch (121) and a second via hole (1221) is provided in the second branch (122). A routing wire (131) is provided in the PCB board (13) at a position corresponding to the first via hole (1211) and the second via hole (1221). A variable capacitor (14) is connected in series with the routing wire (131). A first end of the routing wire (131) is connected to the first via hole (1215) and a second end of the routing wire (131) is connected to the second via hole (1221). The variable capacitor (14) is provided between the two branches (121, 122) of the antenna unit, and thus the manner of current coupling of an antenna can be changed to a certain extent by adjusting the capacitance of the variable capacitor (14), realizing tuning of a terminal antenna within a wide frequency range. Accordingly, the terminal has a good tuning capability.

Description

Terminal housing and terminal

Technical field

The present disclosure relates to the field of terminal technologies, and in particular, to a terminal housing and a terminal.

Background technique

With the development of terminal technology, the quality of the terminal antenna tuning capability directly affects the communication performance of the terminal. The tuning of the terminal antenna refers to the range of the resonant frequency of the terminal antenna, wherein the larger the range of the resonant frequency, the wider the frequency band indicating the signal received by the terminal, and the better the tuning capability.

In the related art, the terminal antenna is disposed on the antenna bracket inside the back cover of the terminal, and the inside of the terminal is further provided with a PCB board. The PCB board is provided with an antenna matching circuit, and the matching circuit is provided with a variable capacitor. The adjustment of the capacitance value of the variable capacitor to achieve tuning of the terminal antenna.

Summary of the invention

In order to solve the problems of the prior art, an embodiment of the present disclosure provides a terminal housing and a terminal. The technical solution is as follows:

In a first aspect, a terminal housing is provided, the terminal housing comprising:

Back cover

An antenna bracket disposed on the inner side of the back cover;

a printed circuit board PCB board disposed inside the terminal housing, the antenna bracket being located between the back cover and the PCB board;

An antenna unit is disposed on the antenna bracket, the antenna unit includes a first branch and a second branch, a first through hole is defined in the first branch, and a second through hole is defined in the second branch ;

a trace on the PCB corresponding to the first via and the second via, wherein the trace has a variable capacitor connected in series, the first end of the trace and the The first via is connected, and the second end of the trace is connected to the second via.

In a possible implementation manner, the first branch and the second branch are each a bending line, and the length of the first branch is smaller than the length of the second branch.

In a possible implementation manner, the first branch is an inverted U-shaped bending line, and the second branch It is a double inverted L-shaped bending line.

In a possible implementation manner, the first via hole is disposed in a horizontal portion of the first branch, and the second via is disposed in two horizontal portions of the second branch near the first The horizontal part of a branch.

In a possible implementation, the first end of the trace is connected to the first via through a spring.

In a possible implementation, the second end of the trace is connected to the second via through a spring.

In a possible implementation, the height of the antenna unit is between 8 cm and 15 cm.

In a possible implementation, the antenna unit has a height of 10 cm.

In a possible implementation, the antenna unit has a width of between 15 cm and 20 cm.

In a possible implementation, the antenna unit has a width of 18 cm.

In a possible implementation manner, a height of the second branch is equal to a height of the antenna unit, and a width of the second branch is equal to a width of the antenna unit.

In a possible implementation manner, a height of the first branch is smaller than a height of the antenna unit and greater than a half of a height of the antenna unit, and a width of the first branch is smaller than a width of the antenna unit and Greater than half the width of the antenna unit.

In a second aspect, a terminal is provided, the terminal comprising the terminal housing of the above first aspect.

Advantageous effects of the technical solutions provided by the embodiments of the present disclosure:

The variable capacitor is disposed between the two branches of the antenna unit. By adjusting the value of the variable capacitor value, the current coupling on the antenna can be changed to some extent, and the variable capacitor is not affected by other elements on the PCB. The influence of the device enables tuning of a wider frequency band range of the terminal antenna, and therefore, the tuning capability is good.

DRAWINGS

The accompanying drawings, which are incorporated in the specification

1 is a side cross-sectional view of a terminal housing portion structure, according to an exemplary embodiment.

FIG. 2A is a schematic structural diagram of an antenna unit according to an exemplary embodiment.

FIG. 2B is a schematic structural diagram of an antenna unit according to an exemplary embodiment.

FIG. 2C is a schematic structural diagram of an antenna unit according to an exemplary embodiment.

FIG. 3 is a return loss and Smith chart of an antenna unit, according to an exemplary embodiment.

4 is a return loss and Smith chart of an antenna unit, according to an exemplary embodiment.

FIG. 5 is a return loss and Smith chart of an antenna unit, according to an exemplary embodiment.

detailed description

The embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. The following description refers to the same or similar elements in the different figures unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with aspects of the present disclosure as detailed in the appended claims.

In order to explain the terminal housing provided by the embodiment of the present disclosure more clearly, the structure of the terminal housing according to the embodiment of the present disclosure is first introduced, as shown in FIG. 1 , which is a side sectional view of the terminal housing part structure. The rear cover 11 of the terminal, the antenna holder 12 and a PCB (Printed Circuit Board) board 13 are included.

The antenna holder 12 is disposed on the inner side of the rear cover 11, the PCB board 13 is disposed inside the terminal housing, and the antenna holder 12 is located between the rear cover 11 and the PCB board 13. There may be a gap between the antenna holder 12 and the rear cover 11 or a gap. The embodiment of the present disclosure does not limit this. The antenna holder 12 is made of an insulating material.

In the embodiment of the present disclosure, the antenna holder 12 is provided with an antenna unit, for example, an antenna unit is printed on the upper surface of the antenna holder 12. The structure of the antenna unit is as shown in FIG. 2A, and the structure of the antenna unit is described in detail below.

1. Introduction of the antenna branch

The antenna unit includes a first branch 121 and a second branch 122. In order to reduce the area of the antenna, the first branch 121 and the second branch 122 may both be bend lines.

For example, the first branch 121 may be an inverted U-shaped bend line. As shown in FIG. 2A, the inverted U-shaped bending line includes a horizontal portion 1211 and two

vertical portions

1212a and 1212b, and the vertical portion 1212a is located on the left side of the vertical portion 1212b.

In the embodiment of the present disclosure, the first branch is provided with a feeding point 1213 and a grounding point 1214. Feed The point 1213 can be connected to the PCB board 13 through the elastic piece, and the grounding point 1214 can be connected to the grounding portion of the PCB board through the elastic piece. The feed point 1213 may be disposed at one end of the vertical portion 1212a that is not connected to the horizontal portion 1211, and the ground point 1214 may be disposed at an end of the vertical portion 1212b that is not connected to the horizontal portion 1211.

For example, the second branch 122 may be a double inverted L-shaped bend line. As shown in FIG. 2A, each inverted L-shape of the double inverted L-shaped bend line is obtained by rotating the positive L-shape clockwise by 90 degrees. The double inverted L-shaped bend line includes two

horizontal portions

1221a and 1221b and three

vertical portions

1222a, 1222b and 1222c.

The first end of the horizontal portion 1221a is connected to one end of the vertical portion 1222a, and the second end of the horizontal portion 1221a is connected to the first end of the vertical portion 1222c. The first end of the horizontal portion 1221b is coupled to one end of the vertical portion 1222b, and the second end of the horizontal portion 1221b is coupled to the second end of the vertical portion 1222c. The horizontal portion 1221b of the second branch is adjacent to the horizontal portion 1211 of the first branch with a gap therebetween. The vertical portion 1222b of the second branch 122 is adjacent to the vertical portion 1212a of the first branch 121 with a gap therebetween. The length of the vertical portion 1222b may be less than the length of the vertical portion 1222a.

2. Introduction of antenna unit size

In the embodiment of the present disclosure, by designing the first branch 121 and the second branch 122 by using a bending line, good coupling between the antenna branches is achieved, the area of the antenna can be greatly reduced, and the terminal antenna can be miniaturized. .

The antenna unit designed with the above-mentioned bent line has an overall height H of between 8 cm and 15 cm. For example, the height of the antenna unit may be 10 cm. The overall width W of the antenna unit is between 15 cm and 20 cm, for example, the width of the antenna unit may be 18 cm.

The length of the bending line formed by the first branch 121 is smaller than the length of the bending line formed by the second branch 122. In order to reduce the area of the antenna unit as much as possible, the height of the second branch 122 may be equal to the height of the antenna unit, and the width of the second branch 122 may also be equal to the width of the antenna unit. Of course, under the premise of ensuring the performance of the antenna, the height and width of the second branch 122 may be smaller than the height and width of the antenna unit, respectively.

The height of the first branch 121 may be smaller than the height of the antenna unit. To ensure the performance of the antenna, the height of the first branch 121 needs to be greater than half of the height of the antenna unit. Correspondingly, the width of the first branch 121 may be smaller than the width of the antenna unit. To ensure the performance of the antenna, the width of the first branch 121 needs to be greater than half of the width of the antenna unit.

3. Introduction of vias

In the embodiment of the present disclosure, as shown in FIG. 2A, a first through hole 1215 is defined in the first branch 121, and a second through hole 1223 is defined in the second branch 122. The first via hole 1211 and the second via hole 1221 are respectively metallized holes for guiding the traces of the first branch 121 and the second branch 122 to the back surface of the antenna holder 12 (ie, the lower surface of the antenna holder 12). In order to be connected to the trace on the PCB board 13. The outer diameter of the first via hole 1211 may be smaller than the line width of the first branch 121, and the outer diameter of the second via may be smaller than the line width of the second branch 122.

It should be noted that the first via 1215 may be disposed at the horizontal portion 1211 of the first branch 121 and any vertical portion, and the second via 1223 may be disposed at any horizontal portion and any vertical portion of the second branch 122. The positions of the first via hole 1215 and the second via hole 1223 on the first branch 121 and the second branch 122 are not limited in the embodiment of the present disclosure. For example, the first via 1215 may be disposed in the horizontal portion 1211 of the first branch 121, the second via 1223 may be disposed in the horizontal portion 1221b of the second branch 122, and the horizontal portion 1221b of the second branch 122 is adjacent to the first The horizontal portion 1211 of the branch 121. The first via 1215 may be disposed at an intermediate position of the horizontal portion 1211 of the first branch 121, and the second via 1223 may be disposed at an intermediate position of the horizontal portion 1221b of the second branch 122. In FIG. 2, only the first via hole 1215 is disposed at an intermediate position of the horizontal portion 1211, and the second via hole 1223 is disposed at an intermediate position of the horizontal portion 1221b. The position of the via hole is not limited in the embodiment of the present disclosure.

4. Introduction of the trace 131 on the PCB board 13

Correspondingly, a trace 131 is disposed on the PCB board 13 at a position corresponding to the first via 1215 and the second via 1223. The first end of the trace 131 is connected to the first via 1215, and the second end of the trace 131 is connected to the second via 1223, so that the first branch 121 and the second branch 122 are connected. For example, the first end of the trace 131 may be connected to the first via 1215 through the elastic piece, and the second end of the trace 131 may be connected to the second via 1223 through the elastic piece. Of course, in addition to the connection manner of the elastic piece, the wire 131 can be connected to the first via hole 1215 and the second via hole 1223 through other conductive structures, for example, a fixed conductive structure, etc., which is not limited by the embodiment of the present disclosure. . It should be noted that, in FIG. 2A, only the connection relationship between the trace 131 and the antenna unit is shown, and the actual positional relationship between the trace 131 and the antenna unit is not represented. In practical applications, the antenna unit is disposed on the upper surface of the antenna mount 12, and the trace is disposed. 131 is disposed on the PCB board 13. For example, a side cross-sectional view of the terminal housing portion structure shown in FIG. 1, in FIG. 1, the trace 131 is on the PCB board 13. It should be noted that the trace 131 is given a certain thickness in FIG. 1 only to more clearly show the connection relationship between the trace 131 and the antenna unit, and does not represent the actual thickness of the trace 131.

It should be noted that, in order to avoid the influence of other components on the PCB 13 on the antenna tuning, the trace 131 may be a trace on the PCB 13 independent of other components, that is, the trace 131 and the PCB 13 There is no connection between other components on the top.

5, the introduction of variable capacitor 14

In order to improve the antenna tuning capability of the terminal, a variable capacitor 14 is connected in series with the trace 131. As shown in FIG. 2A, the variable capacitor 14 may be located at the middle of the trace 131 and may be located at other positions of the trace 131. The embodiment does not limit this. FIG. 2A is exemplified only by the position where the variable capacitance is located at the intermediate position of the trace 131. By adjusting the capacitance value of the variable capacitor 14, tuning of a wider frequency band range of the terminal antenna can be achieved.

Based on the structure of the terminal housing described above, the operating frequency band of the antenna unit in the example of the present disclosure includes a low frequency band of 820 MHz to 960 MHz and a medium and high frequency band of 1700 MHz to 2700 MHz. Wherein, the low frequency of the antenna unit is mainly generated by the line shown in FIG. 2B, as shown by the dotted line in the branch of FIG. 2B; the middle and high frequency of the antenna unit are jointly generated by the line shown in FIG. 2C and the frequency doubling resonance of the low frequency, as shown in FIG. 2C. The line indicated by the dashed line. The antenna unit is a data communication antenna of the terminal. For example, the antenna unit may be a GSM (Global System for Mobile Communication) antenna, a CDMA (Code Division Multiple Access) antenna, or a TD- The SCDMA (Time Division-Synchronous Code Division Multiple) antenna, the LTE (Long Term Evolution) antenna, and the like are not specifically limited in the embodiment of the present disclosure.

Since the variable capacitor 14 is located between the two branches of the antenna unit, the capacitance of the variable capacitor 14 is adjusted to change the capacitive reactance of the antenna unit, and the tuning of the terminal antenna is realized, and the capacitance of the variable capacitor 14 is obtained. The change can change the way of current coupling on the antenna to a certain extent, and realize the tuning of the wider frequency band range of the terminal antenna. In practical applications, when the capacitance value of the variable capacitor 14 becomes larger, the capacitive reactance of the antenna unit decreases, and the connection between the first branch 121 and the second branch 122 approaches direct conduction; when the capacitance of the variable capacitor 14 When the value becomes smaller, the capacitive reactance of the antenna unit becomes larger, and the connection between the first branch 121 and the second branch 122 approaches isolation, and current is coupled through the gap between the first branch 121 and the second branch 122.

The tuning effect of the antenna unit in the embodiment of the present disclosure will be described below with reference to the return loss (S11) and the Smith chart of the antenna unit shown in FIGS. 3 to 5. Certainly, in the embodiment of the present disclosure, the tuning of the capacitance value of the variable capacitor 14 can also be used to achieve tuning of a wider frequency band of the middle and high frequency portions of the operating frequency band of the antenna unit, and the tuning effect thereof is not illustrated by way of example. .

3 is a return loss and a Smith chart of the antenna unit when the variable capacitor 14 is at a certain fixed value, and the corresponding fixed value in FIG. 3 is the maximum capacitance value of the variable capacitor 14. 4 is a return loss and a Smith chart of the antenna unit after changing the capacitance value of the variable capacitor 14 on the basis of FIG. 3, for example, reducing the capacitance value of the variable capacitor 14. FIG. 5 is a return loss and Smith chart of the antenna unit after changing the capacitance value of the variable capacitor when the variable capacitor of the same type as the variable capacitor 14 is placed on the matching circuit.

As can be seen from FIG. 3, when the capacitance value of the variable capacitor 14 is the largest, for example, 8 pF (pitch method), the medium-high frequency matching is good, the low-frequency resonance coil is large, and the frequency range of the low-frequency resonance frequency is between 700 MHz and 806 MHz, not The antenna unit has a low frequency operating band.

As can be seen from FIG. 4, when the capacitance value of the variable capacitor 14 is decreased, for example, 5 pF (pitch method), the low frequency resonance coil moves toward the center of the Smith chart, and the low frequency resonance coil becomes smaller. At this time, the frequency band range of the low frequency resonance frequency is approximately Between 750MHz and 970MHz, covering the entire low-frequency operating frequency range of the antenna unit, the bandwidth of the low-frequency resonant frequency is increased. At the same time, the medium-high frequency resonant bandwidth also covers the entire mid-high frequency range of the antenna unit, satisfying the terminal pair. Signal reception requirements for the entire working frequency band.

As can be seen from FIG. 5, compared to FIG. 3, the Smith resonance coil only moves, and the size of the low frequency resonance coil does not change. The frequency range of the low frequency resonance frequency is about 880 MHz to 940 MHz. It is shown that when the variable capacitor is set on the matching circuit, the adjustment of the variable capacitor can only change the position of the resonant frequency, and cannot extend the bandwidth of the resonant frequency. Similarly, the medium-high frequency resonant frequency only shifts in position, and the resonant frequency band is reduced. For example, the 2.3 GHz frequency at 6 is greater than -5 dB in Figure 5, not the resonant frequency point, and the return loss at the 2.3 GHz frequency labeled 6 in Figure 4 is less than -5 dB, which is the resonant frequency. point. Therefore, the range of the high frequency resonance band in Fig. 5 is reduced.

The terminal housing provided by the embodiment of the present disclosure sets a variable capacitor between two branches of the antenna unit, and adjusts the value of the variable capacitor value, and the variable capacitor is not affected by other components on the PCB. The method of current coupling on the antenna can be changed to a certain extent, and the tuning of the wider frequency band range of the terminal antenna is realized, and therefore, the tuning capability is good.

The embodiment of the present disclosure further provides a terminal, which includes the terminal housing involved in the foregoing embodiment, and includes all the structures and functions of the terminal housing, and details are not described herein. Of course, the terminal further includes a front cover of the terminal, a display screen of the terminal, and other electronic components in the terminal, and the plurality of antenna units included in the terminal housing cooperate with other electronic components in the terminal to implement the communication function of the terminal. Public The specific composition is not limited.

Other embodiments of the present disclosure will be apparent to those skilled in the <RTIgt; The present application is intended to cover any variations, uses, or adaptations of the present disclosure, which are in accordance with the general principles of the disclosure and include common general knowledge or common technical means in the art that are not disclosed in the present disclosure. . The specification and examples are to be regarded as illustrative only,

It is to be understood that the invention is not limited to the details of the details and The scope of the disclosure is to be limited only by the appended claims.

Claims

A terminal housing, wherein the terminal housing comprises:

Back cover

An antenna bracket disposed on the inner side of the back cover;

a printed circuit board PCB board disposed inside the terminal housing, the antenna bracket being located between the back cover and the PCB board;

An antenna unit is disposed on the antenna bracket, the antenna unit includes a first branch and a second branch, a first through hole is defined in the first branch, and a second through hole is defined in the second branch ;

a trace on the PCB corresponding to the first via and the second via, wherein the trace has a variable capacitor connected in series, the first end of the trace and the The first via is connected, and the second end of the trace is connected to the second via.
The terminal housing according to claim 1, wherein the first branch and the second branch are each a bending line, and a length of the first branch is smaller than a length of the second branch.
The terminal housing according to claim 2, wherein the first branch is an inverted U-shaped bending line, and the second branch is a double inverted L-shaped bending line.
The end housing according to claim 3, wherein the first through hole is disposed at a horizontal portion of the first branch, and the second through hole is disposed at two levels of the second branch The portion of the portion is adjacent to the horizontal portion of the first branch.
The terminal housing according to claim 1, wherein the first end of the wire is connected to the first via hole by a spring piece.
The terminal housing according to claim 1, wherein the second end of the wire is connected to the second via hole by a spring piece.
The terminal housing according to claim 1, wherein the height of the antenna unit is between 8 cm and 15 cm.
The terminal housing according to claim 7, wherein the antenna unit has a height of 10 cm.
The terminal housing according to claim 1, wherein said antenna unit has a width of between 15 cm and 20 cm.
The terminal housing according to claim 9, wherein the antenna unit has a width of 18 cm.
The terminal housing according to claim 1, wherein a height of the second branch is equal to a height of the antenna unit, and a width of the second branch is equal to a width of the antenna unit.
The terminal housing according to claim 1, wherein a height of the first branch is smaller than a height of the antenna unit and greater than a half of a height of the antenna unit, and a width of the first branch is smaller than The width of the antenna unit is greater than half the width of the antenna unit.
A terminal, characterized in that the terminal comprises the terminal housing according to any one of claims 1 to 12.