WO2017107057A1

WO2017107057A1 - Mobile terminal

Info

Publication number: WO2017107057A1
Application number: PCT/CN2015/098284
Authority: WO
Inventors: 高建明; 张琛; 刘兵; 孙树辉
Original assignee: 华为技术有限公司
Priority date: 2015-12-22
Filing date: 2015-12-22
Publication date: 2017-06-29
Also published as: CN107112633A; CN107112633B

Abstract

The present invention relates to the technical field of communications. Disclosed is a mobile terminal. The mobile terminal comprises a printed circuit board and an antenna element disposed on the printed circuit board. The antenna element comprises two radiating elements perpendicular and connected to each other, and a feed element configured to feed the two radiating elements respectively, and the two radiating elements are separately coupled to a ground on the printed circuit board. When the feed element feeds either radiating element, the radiating element is coupled to the ground on the printed circuit board to increase an electrical length of the radiating element. The antenna element in the mobile terminal adopts two radiating elements perpendicular to each other, the feed element is used to separately feed the two radiating elements to excite signals, and the two radiating elements are separately coupled to a ground capacitor of the printed circuit board to increase the resonant electrical length of the radiating elements, so that the radiating elements can adopt a small length, thereby reducing the size of an antenna without changing the radiation effect of the antenna.

Description

Mobile terminal

Technical field

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

Background technique

With the development of mobile communication technology, a new wireless router is proposed, such as: Mobile Wireless Fidelity (Mobile Wi-Fi). The conventional wireless router accesses the Internet through the network cable interface, and generally does not need to move, and Mobile Wi-Fi mainly uses 3G wireless technology to access the Internet, and is convenient for mobile use. The basic principle is shown in Figure 1, and Wifi is more and more. The use of the terminal products brings convenience to mobile communications. With the rapid development of 3G 4G mobile technology, the performance requirements of WIFI are getting higher and higher, consumers are paying more and more attention to the size of terminal products, and the design of high-performance miniaturized WIFI antennas on terminal products is particularly necessary.

Prior art solutions The size of WIFI on the terminal product is basically listed below.

In the above WIFI solution, the conventional antenna traces are basically used, and the size is large. Although the efficiency is good, the WIFI footprint ratio cannot be effectively reduced, and the size disadvantage of the multi-WIFI antenna terminal is more obvious. At the same time, in terms of cost reduction, the increase in the area occupied by WIFI also has an adverse effect on the reduction of cost.

Summary of the invention

The present invention provides a mobile terminal for reducing the size of an antenna and facilitating miniaturization of the mobile terminal.

In a first aspect, a mobile terminal is provided, the mobile terminal comprising a printed circuit board and a device An antenna unit disposed on the printed circuit board, the antenna unit includes two radiating units that are perpendicular to each other and connected, and a feeding unit that respectively feeds the two radiating units, and the two radiating units Coupling with the ground on the printed circuit board, respectively; when the feed unit feeds any of the radiating elements, coupling the radiating element to the ground on the printed circuit substrate increases the electrical length of the radiating element.

With reference to the first aspect, in a first possible implementation, the two radiating units are respectively a first radiating unit and a second radiating unit, and the first radiating unit is a Z-shaped structure, and the second The radiating element is an L-shaped structure, wherein a horizontal portion of the first radiating element at the bottom and a horizontal portion of the second radiating unit are of a unitary structure.

In conjunction with the first possible implementation of the first aspect, in a second possible implementation, a horizontal portion of the first radiating unit is coupled to a ground of the printed circuit board, and a second radiating unit A vertical portion is coupled to the ground of the printed circuit board.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation, the horizontal portion of the top portion of the first radiating unit and the bending direction of the vertical portion of the second radiating unit relatively.

In conjunction with the third possible implementation manner of the foregoing first aspect, in a fourth possible implementation, the feeding unit is located in a vertical portion of the first radiating unit and the first radiating unit The second radiating element is formed in a region surrounded by a horizontal portion of the unitary structure.

The first possible aspect of the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, the third possible implementation of the first aspect, and the fourth possible aspect of the first aspect In a fifth possible implementation manner, the feeding unit is an L-shaped structure, and the feeding unit laterally excites the first radiating unit and the second radiating unit by a coupling feeding A 2.4G resonance is generated, the feed unit longitudinally exciting the first radiating element by a coupling feed to generate a 5G resonance.

In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation, the end of the horizontal portion of the second radiating element is inductively coupled to the ground of the printed circuit board.

In combination with the above first aspect, in a seventh possible implementation, the two radiating elements are divided into The first radiating element and the second radiating element are connected, and the end of each radiating element is connected to one plate of the capacitive element, and the ground of the printed circuit board is connected to the other plate of the capacitive element.

In conjunction with the seventh possible implementation of the foregoing first aspect, in an eighth possible implementation, an end of the first radiating element is coupled to the second radiating element to form an inverted T-shaped structure.

In conjunction with the eighth possible implementation of the foregoing first aspect, in a ninth possible implementation, an end of the second radiating element that is away from the capacitive element connected to the second radiating element and the printed circuit The ground inductance of the substrate is connected.

According to the mobile terminal provided by the first aspect, the antenna unit in the mobile terminal uses two relatively vertical radiating units, and the two radiating units are separately fed by the feeding unit to excite the signal, and the two radiating units are Capacitively coupled to the ground of the printed circuit board, respectively, thereby increasing the resonant electrical length of the radiating element such that the radiating element can take a smaller length. Furthermore, the size of the antenna is reduced without changing the radiation effect of the antenna.

DRAWINGS

FIG. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present disclosure;

2 is a schematic structural diagram of an antenna unit of a mobile terminal according to an embodiment of the present invention;

3 is a schematic diagram of a standing wave of a simulated antenna according to an embodiment of the present invention;

4 is a schematic diagram of radiation efficiency of a simulated antenna according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of current distribution of a 2.4G antenna according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of current distribution of a 5G antenna according to an embodiment of the present invention; FIG.

FIG. 7 is a schematic diagram of a standing wave detection of a physical antenna according to an embodiment of the present invention; FIG.

Figure 8 is a schematic diagram of the measured antenna efficiency;

FIG. 9 is a schematic structural diagram of another antenna unit according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of simulation of adding lumped element antenna return loss simulation.

Reference mark:

10-Printed circuit substrate 11 - Ground of printed circuit board 20-Antenna unit

21-first radiation unit 211-horizontal portion 212-vertical portion

22-second radiating element 221-vertical part 222-horizontal part

23-feed unit 231-vertical part 232-horizontal part

detailed description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative and not restrictive.

In the embodiment of the present invention, it should be noted that the ground on the printed circuit board refers to other copper structures on the printed circuit board that remove the antenna unit structure, such as other circuit traces.

In order to facilitate the miniaturization of the antenna of the mobile terminal, a mobile terminal is provided, the mobile terminal comprising a printed circuit substrate and an antenna unit disposed on the printed circuit substrate, the antenna unit comprising two mutually perpendicular and connected a radiating unit, and a feeding unit respectively feeding the two radiating units, and the two radiating units are respectively coupled to a ground on the printed circuit board; and feeding the radiating unit to the feeding unit When electrically, the coupling of the radiating element to the ground on the printed circuit substrate increases the electrical length of the radiating element.

Specifically, the miniaturized antenna in the mobile terminal provided by the embodiment of the present invention uses two relatively vertical radiating units, and the two radiating units are respectively fed by the feeding unit to excite the signal, and the signal is passed. The two radiating elements are respectively capacitively coupled to the ground of the printed circuit board, thereby increasing the resonant electrical length of the radiating element such that the radiating element can take a smaller length. Furthermore, the size of the antenna is reduced without changing the radiation effect of the antenna.

For convenience of description, the two radiating elements are respectively a first radiating unit and a second radiating unit. In the specific work, referring to FIG. 2, the 2.4G resonance generation principle: the feed unit and the first radiation unit and the second radiation unit respectively perform coupling feeding, and the lateral coupling excitation activates the first radiation unit and the second radiation unit to perform radiation. The two radiating elements jointly generate resonance at 2.4G, which is conducive to widening the antenna bandwidth. 5G resonance generation principle: the feed is coupled by the feed unit, and the second radiation unit is longitudinally excited to generate resonance. The ground coupling of the second radiating element with the printed circuit board is equivalent to increasing the electrical length of the second radiating element, and the coupling size is advantageous for adjusting the 5G resonant position.

In the above specific work, the mechanism for miniaturizing the antenna is that the coupling of the second radiating element and the printed circuit board ground provides an equivalent capacitance function, which is to increase the resonant electrical length of the second radiating element, the first radiating element and the printed circuit. The coupling between the substrate grounds provides an equivalent capacitance that increases the resonant electrical length of the second radiating element. The capacitors are loaded such that the equivalent electrical length of the first radiating element and the second radiating element is increased, and the occupied area of the antenna trace is reduced, thereby miniaturizing the antenna.

In order to facilitate the understanding of the structure and principle of the mobile terminal provided by the embodiment of the present invention, the following detailed description is made in conjunction with the specific drawings and embodiments.

First, as shown in FIG. 1 , the number of the antenna units 20 on the mobile terminal provided in this embodiment may be one or more. In this embodiment, the number of the antenna units 20 is two, and two. The antenna elements 20 are symmetrically disposed on both sides of the printed circuit board 10.

As shown in FIG. 2, FIG. 2 shows the structure of the antenna unit 20. In the present embodiment, the antenna unit 20 is composed of a radiating unit and a feeding unit 23. The number of the radiating elements is two, and the feeding unit 23 is used to excite the two radiating elements by the coupling feeding.

In a specific arrangement, the structure of the radiating element can be based on different structures, and the structure of the radiating element will be described in detail below with reference to specific drawings.

Example 1

As shown in FIG. 2, FIG. 2 is a schematic diagram of an antenna structure provided by an embodiment of the present invention. In this embodiment, the two radiating elements are the first radiating unit 21 and the second radiating unit 22, respectively, and the first radiating unit 21 is a Z-shaped structure, and two horizontal portions of the first radiating unit 21 (top The horizontal portion 211 and the horizontal portion of the bottom are both perpendicular to the vertical portion 212, and the second radiating element 22 is an L-shaped structure, wherein the horizontal portion of the first radiating unit 21 at the bottom and the horizontal portion 222 of the second radiating unit 22 As a unitary structure.

Specifically, as shown in FIG. 2, the first radiating element 21 is an inverted L-shaped structure, and the top horizontal portion 211 of the first radiating element 21 is coupled to the ground 11 of the printed circuit board, and the second radiating unit 22 It is a horizontal L-shaped structure, and the vertical portion 221 of the second radiating element 22 is coupled to the ground 11 of the printed circuit board. That is, as shown in FIG. 2, the first radiating element 21 is efi, wherein the horizontal portion 211 is ef, the vertical portion 212 is fi, and the horizontal portion id at the bottom is at the first radiating element 21 and the printed circuit board. When the ground 11 is coupled, the ef of the first radiating element 21 is coupled to the ground 11 of the printed circuit board equivalent to a capacitance. The second radiating element 22 is gcd, wherein the horizontal portion 221 is cid and the vertical portion 222 is gc. When the second radiating element 22 is coupled to the ground 11 of the printed circuit board, the gc portion of the second radiating element 22 and the printed circuit The ground 11 of the substrate is coupled to be equivalent to a capacitor. And the id portion of the first radiating unit 21 and the id portion of the cid portion in the second radiating unit 22 are of a unitary structure.

In order to reduce the spatial area occupied by the radiating element when the first radiating element 21 and the second radiating element 22 are disposed, as a preferred embodiment, the horizontal portion 211 of the top portion of the first radiating element 21 and the second radiating unit 22 The bending directions of the vertical portions 221 are opposite. That is, as shown in FIG. 2, the bending direction of the top horizontal portion 221 of the first radiation unit 21 is opposite to the bending direction of the vertical portion 221 in the second radiation unit 22. Thereby, the first radiating unit 21 and the second radiating unit 22 are disposed to minimize the occupied area.

In addition, in order to further reduce the area occupied by the antenna unit 20, the feeding unit 23 has an L-shaped structure, and the feeding unit 23 laterally excites the first radiating unit 21 and the second radiating unit 22 to generate 2.4G resonance by the coupling feeding. The feed unit 23 generates the 5G resonance by longitudinally exciting the first radiating element 21 by the coupling feed. At the specific setting, the feeding unit 23 is disposed in the area enclosed by the fid, thereby reducing the space occupied by the antenna unit.

In the specific work, the principle of 2.4G resonance generation: through the coupling feeding, the lateral coupling excitation radiates the efd and gcd double branches, and the two branches jointly generate resonance at 2.4G, which is conducive to widening the antenna bandwidth. The antenna miniaturization implementation mechanism: ef is coupled with the ground 11 of the printed circuit board 10 to provide an equivalent capacitance function, which is to increase the resonant length of the efd branch, and the coupling between gc and the ground 11 of the printed circuit board 10 provides an equivalent capacitance. The effect is to increase the resonant electrical length of the gcd branch. As a preferred embodiment, the end of the horizontal portion 221 of the second radiating element 22 is inductively coupled to the ground 11 of the printed circuit board. That is, the inductance applied between dh (h is a point on the ground 11 of the printed circuit board) is advantageous for increasing the electrical length of efd and gcd. The equivalent electrical length of the efd and gcd double branches is increased. These capacitors are loaded in an inductor, which increases the equivalent electrical length of the efd and gcd double branches, and reduces the antenna footprint, thereby miniaturizing the antenna. 5G resonance generation principle: through the coupling feed, the longitudinal excitation acts as the efi branch to generate resonance. The coupling of ef and ground 11 of the printed circuit board is equivalent to the increase of the efi section The electrical length and coupling size facilitate adjustment of the 5G resonant position.

In order to embody the effect of the antenna unit 20 in the mobile terminal provided by this embodiment, a specific embodiment will be described below.

The overall size of the printed circuit board is 65 mm * 50 mm, and the reference is a commonly developed size of a general small size E5 product. The antenna unit of the present invention is placed centrally on the side of the board. The occupied area is 4*8mm.

The standing wave S11 obtained by the simulation is shown in Fig. 3. As can be seen from Fig. 3, the signal covers 2.4G to 2.5 GHz and 5.15G to 5.85 GHz (the terminal product 5G is usually 36CH to 165CH, that is, 5180 MHz to 5825 MHz). The radiation efficiency of the antenna unit is shown in Fig. 4; and the current distribution of the antenna at 2.4G and 5G is simulated as shown in Figs. 5 and 6. 5 is the 2.4G antenna current distribution, and FIG. 6 is the 5G antenna current distribution. From the simulation current distribution, the 2.4G resonant path and the 5G resonant path are consistent with the theoretical analysis.

According to the simulated data, the product of the fixture is actually debugged. The standing wave and efficiency are tested as shown in Fig. 7 and Fig. 8. From the measured efficiency, the 2.4G efficiency is 42-62%, and the 5G efficiency is 40%-60%. Due to the high frequency loss of the FR4 dielectric board, the 5G measured efficiency is lower than the simulation. But it is also about 1dB more efficient than the traditional antenna scheme, meeting the design specifications of the terminal product wifi antenna.

Example 2

As shown in FIG. 9, the two radiating elements provided in this embodiment are the first radiating unit 21 and the second radiating unit 22, respectively, and the end of each radiating unit is connected to one plate of the capacitive element, and the printed circuit board 10 is The ground 11 is connected to the other plate of the capacitive element.

The working principle of the antenna unit 20 provided in this embodiment is the same as that in the first embodiment, and details are not described herein again.

In terms of the connection of the two radiating elements, the end of the first radiating element 21 is connected to the second radiating element 22 to form an inverted T-shaped structure.

In order to further reduce the area occupied by the antenna unit 20, the end of the capacitive element connected to the second radiating element 22 on the second radiating element 22 is inductively connected to the ground 11 of the printed circuit board 10. The electrical length of the first radiating element 21 and the second radiating element 22 is effectively increased by the applied inductance.

In this embodiment, several capacitive coupling portions in the antenna structure are replaced by lumped capacitive elements. That is, as shown in FIG. 9, C1 denotes a capacitance which replaces the coupling between the second radiating element 22 and the ground 11 of the printed circuit board, and C2 denotes a capacitance which replaces the coupling between the first radiating element 21 and the ground 11 of the printed circuit board. , C3 represents the applied inductance. The structure shown in FIG. 9 is implemented, and the return loss obtained by the simulation is as shown in FIG.

The antenna unit 20 provided in the second embodiment is a modified structure in the first embodiment, that is, the coupling between the radiating unit and the ground 11 of the printed circuit board 10 is replaced by a capacitive element, thereby facilitating the setting of the antenna and further reducing The space occupied by the antenna unit 20.

It can be seen from the foregoing specific embodiment 1 and the second embodiment that, in the mobile terminal provided in this embodiment, two radiating elements are respectively fed through the feeding unit 23 by using two relatively vertical radiating units. The signal is thereby energized and capacitively coupled to the ground 11 of the printed circuit board 10 by the two radiating elements, thereby increasing the resonant electrical length of the radiating element such that the radiating element can take a smaller length. Furthermore, the size of the antenna is reduced without changing the radiation effect of the antenna.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A mobile terminal, comprising: a printed circuit board and an antenna unit disposed on the printed circuit board, the antenna unit comprising two radiating units that are perpendicular to each other and connected to the two radiating elements a feed unit that feeds, and the two radiating units are respectively coupled to a ground on the printed circuit board; and when the feed unit feeds any one of the radiating units, the radiating unit and the printed circuit board The above ground coupling increases the electrical length of the radiating element.
The mobile terminal according to claim 1, wherein the two radiating units are a first radiating unit and a second radiating unit, respectively, and the first radiating unit is a Z-shaped structure, and the second radiating unit It is an L-shaped structure in which a horizontal portion of the first radiating element at the bottom and a horizontal portion of the second radiating unit are of a unitary structure.
The mobile terminal of claim 2, wherein a horizontal portion of the first radiating unit is coupled to a ground of the printed circuit board, and a vertical portion of the second radiating unit and the printed circuit board Ground coupling.
The mobile terminal of claim 3, wherein a horizontal portion of the top of the first radiating unit is opposite to a bending direction of the vertical portion of the second radiating unit.
The mobile terminal according to claim 4, wherein the feeding unit is located at a level of a vertical portion of the first radiating unit and an integral structure of the first radiating unit and the second radiating unit Partially enclosed area.
The mobile terminal according to any one of claims 2 to 5, wherein the feeding unit has an L-shaped structure, and the feeding unit laterally excites the first radiating unit and the The second radiating elements collectively produce a 2.4G resonance, the feed unit longitudinally exciting the first radiating element by a coupling feed to generate a 5G resonance.
The mobile terminal of claim 6, wherein an end of the horizontal portion of the second radiating element is inductively coupled to a ground of the printed circuit board.
The mobile terminal according to claim 1, wherein the two radiating elements are a first radiating unit and a second radiating unit, respectively, and an end of each radiating unit and one of the capacitive elements The plates are connected, and the ground of the printed circuit board is connected to the other plate of the capacitive element.
A mobile terminal according to claim 8, wherein an end of said first radiating element is coupled to said second radiating element to form an inverted T-shaped structure.
The mobile terminal according to claim 9, wherein an end of the capacitive element connected to the second radiating element on the second radiating element is inductively connected to a ground of the printed circuit board.