WO2017000463A1

WO2017000463A1 - Mobile terminal and method for improving antenna performance of mobile terminal

Info

Publication number: WO2017000463A1
Application number: PCT/CN2015/094010
Authority: WO
Inventors: 程孝奇
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-06-29
Filing date: 2015-11-06
Publication date: 2017-01-05
Also published as: CN106329055A; CN106329055B

Abstract

Disclosed in this paper are a mobile terminal and a method for improving antenna performance of the mobile terminal. The mobile terminal includes: a PCB mainboard; a bracket for mounting an antenna, and the bracket is mounted on the PCB mainboard via a conductive connecting piece, and the bracket is connected with the mainboard ground of the PCB mainboard; an antenna mounted on the bracket and spaced from the connecting piece; and a parasitic branch connected with the connecting piece, and the parasitic branch is arranged beside the antenna and is spaced apart from the antenna, and the parasitic branch is used to improve the bandwidth and/or radiation beam direction of the antenna.

Description

Mobile terminal and method for improving antenna performance of mobile terminal

Technical field

This application relates to, but is not limited to, the field of electronic device technology.

Background technique

In the antenna design of the related art mobile terminal, a sufficient number of grounding feed points, that is, grounding shrapnel, two or more, are usually reserved on the printed circuit board (PCB). The main purpose is to facilitate the performance design of the antenna, that is, the grounding shrapnel is used to separately extract the parasitic branch and the antenna, and the parasitic branch is used to widen the bandwidth of the antenna and improve the radiation efficiency of the antenna.

However, due to the layout of the motherboard PCB and the clearance area of the antenna, when the antenna is grounded to the ground, there is no additional circuit area to lay out the grounding shrapnel feed point or grounding trace of the parasitic branch, resulting in parasitic branches. The section cannot be connected to the motherboard ground. In this case, the antenna performance such as insufficient bandwidth of the antenna is greatly limited.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

This document provides a mobile terminal that can ensure that the parasitic branch is smoothly led out to connect to the main board when the antenna is reserved for the single grounding shrapnel, thereby improving the antenna bandwidth.

A mobile terminal includes: a PCB main board; a bracket for mounting an antenna, is mounted on the PCB main board through an electrically conductive connector, and is connected to a main board ground of the PCB main board; And an antenna spaced from the connecting member; and a parasitic branch connected to the connecting member, spaced apart from one side of the antenna for adjusting the length and/or adjustment of the parasitic branch a distance between the parasitic branch and the antenna to improve the bandwidth of the antenna, and/or to improve the radiation beam direction of the antenna by adjusting the opening direction of the parasitic branch to improve the antenna Bandwidth and / or radiation beam direction.

Optionally, the PCB main board includes: a dielectric substrate; and a main board ground on the dielectric substrate, and the bracket is mounted on the main board ground through the connecting member.

Optionally, the PCB main board further includes: an electrically conductive stud fixed on the main board ground, and the connecting end of the connecting member passes through the bracket and is screwed into the stud to make the bracket It is fixed on the ground of the main board.

Optionally, the stud is integrally formed with the main board, and the connecting member is a screw, and the parasitic branch is in close contact with the bracket.

Optionally, the dielectric substrate and the main board have a length ranging from 100 to 150 mm and a width ranging from 50 to 70 mm, and the dielectric substrate is made of a glass fiber epoxy resin copper clad flame resistant material or a polyamide fiber. The dielectric constant ranges from 4 to 5; the stud is made of aluminum, aluminum alloy, copper, copper alloy, silver or silver alloy; the length of the parasitic branch is in the range of one quarter of the resonant wavelength of the antenna To one-half.

Optionally, the dielectric substrate and the main board have a length of 125 mm and a width of 60 mm, and the dielectric substrate is made of a glass fiber epoxy resin copper clad flame resistant material FR4, and has a dielectric constant of 4.4; the stud The material is an aluminum-magnesium alloy; the length of the parasitic branch is one quarter or one half of the resonant wavelength of the antenna; wherein the parasitic branch and the antenna body both adopt a laser forming LDS process Manufacturing.

Optionally, the antenna includes an antenna body, a feeding elastic foot and a grounding elastic foot, and the connecting member is adjacent to the antenna body.

Optionally, the antenna is mounted at a clearance area of the bracket, and the connecting member and the parasitic branch are located on a right side of the antenna; wherein a length and/or an adjustment of the parasitic branch is adjusted The distance between the parasitic branch and the antenna is used to improve the bandwidth of the antenna.

Optionally, the antenna is located at a clearance area on the bracket, the connecting member is located at a left side of the antenna, and the parasitic branch is annularly disposed around a circumference of the antenna body; Adjusting the opening direction of the parasitic branch to improve the radiation beam direction of the antenna.

A method for improving the performance of an antenna of a mobile terminal, which is used in the mobile terminal according to any of the above embodiments, comprising: installing a parasitic branch on the bracket, and connecting the parasitic branch to the ground of the main board through the connecting member, At the same time, the parasitic branch is spaced from the antenna; adjusting the length of the parasitic branch and/or Or adjusting a distance between the parasitic branch and the antenna to improve a bandwidth of the antenna, and/or adjusting an opening direction of the parasitic branch to improve a radiation beam direction of the antenna.

Optionally, the connector is adjacent to the antenna.

Optionally, the length of the parasitic branch is one quarter or one half of the resonant wavelength of the antenna.

Optionally, the antenna is located at a clearance area of the bracket, the connecting member and the parasitic branch are located at a right side of the antenna; and a distance between the parasitic branch and the antenna is 1 ~2mm.

The mobile terminal realizes the connection with the main board ground through the connection of the parasitic branch and the fixing bracket, realizes that the parasitic branch is smoothly taken out, and then improves the antenna by laying out the wiring form of the parasitic branch. The bandwidth also ensures the radiation efficiency of the antenna.

Further, the antenna mounted on the bracket adjusts the layout of the wiring during installation so that the bandwidth of the antenna reaches the reference requirement as much as possible.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic partial structural diagram of a mobile terminal according to an embodiment of the present invention;

2 is a comparison diagram of antenna return loss curves of the mobile terminal of FIG. 1 with reference to a parasitic branch and an unreferenced parasitic branch;

FIG. 3 is a schematic diagram of a partial structure of a mobile terminal according to another embodiment of the present invention.

Wherein, the correspondence between the reference numerals and the component names in FIGS. 1 and 3 is:

1 bracket, 2 connectors, 3PCB motherboard, 31 motherboard ground, 32 dielectric substrates, 33 studs, 4 parasitic branches, 41 antenna bodies, 42 feed pins, 43 ground pins.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

A mobile terminal according to some embodiments of the present invention and a method for improving antenna performance of the mobile terminal are described below with reference to the accompanying drawings.

The mobile terminal provided by the embodiment of the present invention, as shown in FIG. 1 and FIG. 3, includes: a PCB main board 3; a bracket 1 for mounting an antenna, is mounted on the PCB main board 3 through the conductive connection 2, and is connected to the PCB main board The main board ground 31 of the 3 is connected; the antenna mounted on the bracket 1 and spaced apart from the connecting member 2; and the parasitic branch 4 connected to the connecting member 2 are spaced apart from one side of the antenna for improving the antenna Bandwidth and/or radiation beam direction (ie, by adjusting the length of the parasitic branch 4 and/or adjusting the distance between the parasitic branch 4 and the antenna to improve the bandwidth of the antenna, and/or The channel beam and/or the radiation beam direction of the antenna are improved by adjusting the direction of the opening of the parasitic branch 4 to improve the radiation beam direction of the antenna.

The mobile terminal provided by the embodiment of the present invention realizes the connection with the main board ground through the connection of the parasitic branch and the connecting piece of the fixed bracket, realizes that the parasitic branch is smoothly taken out, and then performs the routing form of the parasitic branch. The layout increases the bandwidth of the antenna and ensures the radiation efficiency of the antenna.

Among them, the antenna mounted on the bracket adjusts the layout of the wiring during installation so that the bandwidth of the antenna reaches the reference requirement as much as possible, so that the parasitic branch can be further improved to improve the performance of the antenna.

In addition, in the mobile terminal provided by the foregoing embodiment of the present invention:

As shown in FIG. 1 and FIG. 3, the PCB main board 3 includes: a dielectric substrate 32; and a main board ground 31 on the dielectric substrate 32. The bracket 1 is mounted on the main board ground 31 via the connecting member 2, and one end of the parasitic branch 4 is connected. The pieces 2 are connected to each other to connect the parasitic branch 4 to the main board ground 31.

As shown in FIG. 1 and FIG. 3, the PCB main board 3 further includes: an electrically conductive stud 33 fixed on the main board ground 31. The connecting end of the connecting member 2 passes through the bracket 1 and is screwed into the stud 33 to make the bracket. 1 is fixed on the main board ground 31; the parasitic branch 4 is connected to the main board ground 31 through the connecting member 2 and the stud 33.

In one embodiment of the present invention, the stud 33 and the main board ground 31 are of a unitary structure; the connecting member 2 is a screw or a bolt, and the parasitic branch 4 is in close contact with the surface of the bracket 1.

Of course, the stud 33 and the main board ground 31 may also be connected to each other, and the two may also be connected by soldering.

In one embodiment of the present invention, the length of the dielectric substrate 32 and the main board ground 31 is in the range of 100 to 150 mm and a width range of 50 to 70 mm. The dielectric substrate 32 is made of a glass fiber epoxy resin copper clad flame resistant material or a polyamide fiber, and has a dielectric constant ranging from 4 to 5; the stud 33 is made of aluminum or aluminum. Alloy, copper, copper alloy, silver or silver alloy; the length of the parasitic branch 4 ranges from one quarter to one half of the resonant wavelength of the antenna; the parasitic branch 4 and/or the antenna body 41 adopts a laser forming LDS process Manufacturing.

In one embodiment of the present invention, the dielectric substrate 32 and the main board ground 31 have a length of 125 mm and a width of 60 mm, and the dielectric substrate 32 is made of a glass fiber epoxy resin clad laminate flame resistant material FR4, and has a dielectric constant of 4.4; stud 33 The material is aluminum-magnesium alloy; the length of the parasitic branch 4 is one quarter or one half of the resonant wavelength of the antenna; the parasitic branch 4 and the antenna body 41 are both manufactured by a laser forming LDS process.

Such a mobile terminal has a good bandwidth of the antenna and improves the radiation efficiency of the antenna.

As shown in FIG. 1 and FIG. 3 , the antenna includes an antenna body 41 , a feeding leg 42 and a grounding leg 43 , and the connecting member 2 is adjacent to the antenna body 41 .

In the first embodiment of the present invention, as shown in FIG. 1, the antenna is mounted at the clearance area of the bracket 1, the connecting member 2 and the parasitic branch 4 are located on the right side of the antenna; and the length of the parasitic branch 4 is the antenna resonance. One quarter of the wavelength. Wherein, adjusting the length of the parasitic branch 4 and/or adjusting the distance between the parasitic branch 4 and the antenna to improve the bandwidth of the antenna, and/or adjusting the opening direction of the parasitic branch 4 surrounding the open ring to improve the radiation beam of the antenna direction.

In this embodiment, the length of the parasitic branch 4 is adjusted and the distance between the parasitic branch 4 and the antenna is adjusted to improve the bandwidth of the antenna, thereby improving the radiation efficiency of the antenna and ensuring good performance of the antenna.

2 is a comparison diagram of antenna return loss curves of a mobile terminal in a working state of a reference parasitic branch and an unreferenced parasitic branch according to the above embodiment of the present invention, wherein a broken line indicates an antenna that does not introduce a parasitic branch through the connector. The wave loss curve, that is, the return loss curve of the antenna body, the solid line indicates the return loss curve of the antenna after the parasitic branch is introduced through the connecting member; as can be seen from the two curves, the antenna body introduces the parasitic branch after the connecting member The high frequency is in the 2.4-2.7 GHz frequency band, the resonance is deepened, the antenna radiation efficiency is improved, and the high frequency bandwidth is further broadened, which can well cover 1.71-2.69 GHz, meeting the design requirements of modern 4G terminal antennas.

In the second embodiment of the present invention, as shown in FIG. 3, the antenna is located at the clearance area on the bracket 1, the connecting member 2 is located at the left side of the antenna, and the parasitic branch 4 is annularly surrounding the antenna body 41. The circumference side; and the length of the parasitic branch 4 is one-half of the resonant wavelength of the antenna. Wherein, the length of the parasitic branch 4 is adjusted and/or the distance between the parasitic branch 4 and the antenna is adjusted to improve the bandwidth of the antenna, and/or to adjust the opening direction of the parasitic branch 4 to improve the radiation beam direction of the antenna.

In this embodiment, by adjusting the opening direction of the parasitic branch 4, the radiation beam direction of the antenna is improved, and the dielectric loss of the human body in the state of holding or approaching the head is reduced, thereby improving the radiation efficiency of the antenna and ensuring that the antenna has Good performance.

Of course, the length of the parasitic branch 4 may also be one-third, one-fifth, etc. of the resonant wavelength of the antenna, and the distance between the parasitic branch 4 and the antenna is adjusted to improve the bandwidth of the antenna, and/or adjust the parasitic branch. The opening direction of the section 4 to improve the radiation beam direction of the antenna can also achieve the object of the present application.

Optionally, the mobile terminal is a mobile phone, a tablet, or the like.

The method for improving the antenna performance of the mobile terminal provided by the embodiment of the present invention, the mobile terminal according to any of the foregoing embodiments, includes: installing a parasitic branch 4 on the bracket 1 and passing the parasitic branch 4 through the connecting member 2 Connected to the main board ground 31 while the parasitic branch 4 is spaced from the antenna; adjust the length of the parasitic branch 4 and/or adjust the distance between the parasitic branch 4 and the antenna to improve the bandwidth of the antenna, and/or adjust the parasitic branch The opening direction of the section 4 improves the radiation beam direction of the antenna.

In the method for improving the antenna performance of the mobile terminal provided by the embodiment of the present invention, the parasitic branch 4 is connected to the main board ground 31 through the connecting member 2, so that the parasitic branch 4 is smoothly extracted, thereby effectively improving the performance of the antenna.

Wherein, the connecting member 2 is adjacent to the antenna; that is, the connecting member 2 of the fixing bracket may have multiple and dispersed arrangements, and the parasitic branch 4 is connected to one connecting member 2 adjacent to the antenna to better ensure the parasitic branch 4 is better. Improve the performance of the antenna.

Optionally, the length of the parasitic branch 4 is one quarter or one half of the resonant wavelength of the antenna.

In one embodiment of the present invention, as shown in FIG. 1, the antenna is located at the clearance area of the bracket 1, the connecting member 2 and the parasitic branch 4 are located on the right side of the antenna; and the distance between the parasitic branch 4 and the antenna is 1 ~2mm.

In this embodiment, the antenna has a good bandwidth, and the parasitic branch 4 improves the radiation of the antenna. effectiveness.

In summary, the mobile terminal provided by the embodiment of the present invention realizes the connection with the main board ground by connecting the parasitic branch and the connecting member of the fixing bracket, so that the parasitic branch is smoothly taken out, and then the parasitic branch is passed. The layout of the traces increases the bandwidth of the antenna and ensures the radiation efficiency of the antenna.

In the description herein, the terms "installation", "connected", "connected", "fixed", etc., should be understood broadly. For example, "connecting" may be a fixed connection, a detachable connection, or an integral connection. They can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the meaning of the above terms in this document can be understood according to the actual situation.

In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an embodiment" or the like means that the features, structures, materials or characteristics described in connection with the embodiments or examples are included in the invention. In one embodiment or example. In the present specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Industrial applicability

Claims

A mobile terminal comprising: a PCB motherboard (3);

a bracket (1) for mounting an antenna, mounted on the PCB main board (3) through a conductive connecting member (2), and connected to a main board ground (31) of the PCB main board (3);

An antenna mounted on the bracket (1) and spaced apart from the connector (2); and

Parasitic branches (4) connected to the connector (2) are spaced apart from one side of the antenna for adjusting the length of the parasitic branch (4) and/or adjusting the parasitic The distance between the branch (4) and the antenna to improve the bandwidth of the antenna, and/or to improve the radiation beam direction improvement of the antenna by adjusting the opening direction of the parasitic branch (4) The bandwidth of the antenna and/or the direction of the radiation beam.
The mobile terminal of claim 1, wherein the PCB motherboard (3) comprises:

a dielectric substrate (32); and

The main board ground (31) is located on the dielectric substrate (32), and the bracket (1) is mounted on the main board ground (31) through the connecting member (2).
The mobile terminal of claim 2, wherein the PCB motherboard (3) further comprises:

An electrically conductive stud (33) is fixed on the main board ground (31), and a connecting end of the connecting member (2) passes through the bracket (1) and is screwed into the stud (33), The bracket (1) is fixed to the main board ground (31).
The mobile terminal according to claim 3, wherein the stud (33) and the main board ground (31) are of a unitary structure, the connecting member (2) is a screw, and the parasitic branch (4) Close the bracket (1).
The mobile terminal according to claim 3, wherein the dielectric substrate (32) and the main board ground (31) have a length ranging from 100 to 150 mm and a width ranging from 50 to 70 mm, and the dielectric substrate (32) The material is glass fiber epoxy resin copper clad flame resistant material or polyamide fiber, and the dielectric constant ranges from 4 to 5; the stud (33) is made of aluminum, aluminum alloy, copper, copper alloy, silver or silver alloy. The length of the parasitic branch (4) ranges from one quarter to one half of the resonant wavelength of the antenna.
The mobile terminal according to claim 5, wherein the dielectric substrate (32) and the main board ground (31) have a length of 125 mm and a width of 60 mm, and the dielectric substrate (32) is made of glass fiber epoxy. Resin copper clad laminate flame resistant material FR4, dielectric constant is 4.4; the stud (33) is made of aluminum-magnesium alloy; the length of the parasitic branch (4) is one quarter or two of the resonant wavelength of the antenna One of the points;

Wherein, the parasitic branch (4) and the antenna body (41) are both manufactured by a laser forming LDS process.
The mobile terminal according to claim 1, wherein the antenna comprises an antenna body (41), a feeding elastic foot (42) and a grounding elastic foot (43), and the connecting member (2) is adjacent to the antenna body (41).
The mobile terminal according to any one of claims 1 to 7, wherein the antenna is mounted at a clearance area of the bracket (1), the connecting member (2) and the parasitic branch (4) Located on the right side of the antenna;

Wherein, the length of the parasitic branch (4) is adjusted and the distance between the parasitic branch (4) and the antenna is adjusted to improve the bandwidth of the antenna.
The mobile terminal according to any one of claims 1 to 7, wherein the antenna is located at a clearance area on the bracket (1), and the connecting member (2) is located at a left side of the antenna, The parasitic branch (4) is surrounded by an annular ring around the circumference of the antenna body (41);

Wherein, the opening direction of the parasitic branch (4) is adjusted to improve the radiation beam direction of the antenna.
A method for improving the performance of an antenna of a mobile terminal, for the mobile terminal according to any one of claims 1 to 9, comprising:

A parasitic branch (4) is mounted on the bracket (1), and the parasitic branch (4) is connected to the main board ground (31) through the connecting member (2) while the parasitic branch (4) and the antenna are connected Phase spacing; adjusting the length of the parasitic branch (4) and/or adjusting the distance between the parasitic branch (4) and the antenna to improve the bandwidth of the antenna, and/or to adjust the parasitic branch The opening direction of section (4) improves the radiation beam direction of the antenna.
A method of improving antenna performance of a mobile terminal according to claim 10, wherein

The connector (2) is adjacent to the antenna.
A method of improving antenna performance of a mobile terminal according to claim 10, wherein

The length of the parasitic branch (4) is one quarter or one half of the resonant wavelength of the antenna.
A method of improving antenna performance of a mobile terminal according to any one of claims 10 to 12, wherein said antenna is located at a clearance area of said bracket (1), said connecting member (2) and said parasitic a branch (4) is located on the right side of the antenna;

The distance between the parasitic branch (4) and the antenna is 1 to 2 mm.