WO2015184867A1

WO2015184867A1 - Specular reflector and wireless terminal antenna device

Info

Publication number: WO2015184867A1
Application number: PCT/CN2015/073140
Authority: WO
Inventors: 舒超凡; 刘洋; 石青松
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-09-15
Filing date: 2015-02-15
Publication date: 2015-12-10
Also published as: CN204130704U

Abstract

A specular reflector and a wireless terminal antenna device. The specular reflector is arranged between two antennas, wherein the specular reflector is of a multilayer structure; and a metal floor is arranged in the middle of the specular reflector, each layer except the metal floor is provided with different metal chips, and the metal chips are connected to the metal floor through metal via holes. In the solution of the embodiments of the present utility model, a structure of a reflection mirror is inserted between two antennas, so that the radiation direction of the antennas can be changed, namely the original directional diagram of the antennas is changed, thereby reducing the relevance between antennas, and solving the problem in the related art that the coefficient of relevance between antennas is relatively high. Moreover, the present utility model has the characteristics of having a simple structure, having a small volume, and being convenient for integration with a cellphone circuit board, and has the advantages of having low costs, being convenient for batch production, etc., thereby being able to be suitable for various terminal systems.

Description

Specular reflector and wireless terminal antenna device

Technical field

The utility model relates to the field of mobile communication, in particular to a specular reflector and a wireless terminal antenna device.

Background technique

The emergence of LTE (Long Term Evolution, 3GPP Long Term Evolution) has promoted the development of wireless broadband access technologies and industries. As the demand for services becomes more and more extensive, the functions of LTE products are required to be more and more. Usually, an LTE terminal product requires GPS (Global Positioning System) and WIFI functions. At the same time, mobile terminals are becoming more and more compact, low-cost, ultra-thin and stylish, and more and more compatible at the same time. Multiple communication bands require high performance. This requires the antenna of the mobile terminal to be not only small in size but also to have a wide frequency band, and at the same time have a very small correlation.

As an important part of wireless terminal products, antenna not only directly affects the transceiver performance of wireless terminal equipment, but also affects the overall size and aesthetics of wireless terminals. Therefore, the design can meet the structural requirements, customer requirements, and antenna performance indicators. The required antennas have become a problem currently facing the industry.

The planar antenna has the advantages of light weight, small size, low profile, easy integration, low cost, and easy fabrication. It can meet the requirements of the antenna size of the mobile terminal device, but now the antenna needs to be compatible with multiple communication bands at the same time, and is limited at the same time. In the physical space, multiple antennas need to be laid out, which requires minimum interference between the antenna and the antenna, which is a difficult point in antenna design.

In view of the high correlation coefficient between antennas in the related art, an effective solution has not been proposed yet.

Utility model content

The present invention provides a specular reflector and a wireless terminal antenna device for solving the above technical problem.

In order to achieve the above objectives, the following technical solutions are adopted:

A specular reflector disposed between two antennas, wherein the specular reflector 1 is a multi-layer structure; the specular reflector 1 is provided with a metal floor 2 in the middle thereof, and each layer except the metal floor 2 is provided Different metal patches 3 are attached to the metal floor 2 via metal vias 4.

Optionally, the specular reflector 1 is disposed at an intermediate position between the two antennas.

Optionally, the specular reflector 1 is fixed on the main board 5, and the connection manner is a plug-in type or a spring piece contact type.

Optionally, when the connection mode is the plug-in type, the metal floor 2 is provided with a metal pin 6 at the bottom thereof, and the metal pin 6 is fixed to the main board 5 through the positioning hole 7.

Optionally, the different metal patch 3 comprises an inner metal patch 3a, and/or an outer metal patch 3b.

Optionally, in the specular reflector 1, the remainder is filled with the medium 8 except for the metal floor 2, the multilayer structure, the metal patch 3, and the metal via 4.

Optionally, the multilayer structure is a left-right symmetric structure, and the plurality of layers are three or more layers.

Optionally, the specular reflector 1 is suitable for use in a printed circuit board PCB antenna or a bracket antenna.

A wireless terminal antenna device, wherein the device comprises the above-mentioned specular reflector 1, a main board 5, and a first antenna 9 and a second antenna 10 fixed on the main board 5; wherein the specular reflector 1 is located The first antenna 9 and the second antenna 10 are fixed on the main board 5.

Compared with the related art, the embodiment of the present invention inserts a mirror surface structure between the antenna and the antenna, and can change the radiation direction of the antenna, that is, change the original direction of the antenna, and reduce the correlation between the antenna and the antenna. The problem of high correlation coefficient between antennas in the related art is solved. The embodiment of the utility model has the advantages of simple structure, small size, convenient integration with the mobile phone circuit board, low cost, convenient mass production, and the like, and can be applied to various terminal systems.

The above description is only an overview of the technical solutions of the embodiments of the present invention, and the technical means of the embodiments of the present invention can be more clearly understood, and can be implemented according to the contents of the specification, and the above and other objects and features of the present invention are made. The advantages and advantages can be more clearly understood, and specific embodiments of the embodiments of the present invention are described below.

BRIEF abstract

The drawings in the embodiments of the present invention are described in the accompanying drawings, which are used to explain the embodiments of the present invention, and are used to explain the embodiments of the present invention, and do not constitute the protection of the present invention. The limits of the scope.

1 is a cross-sectional view of a specular reflector in accordance with an embodiment of the present invention;

2 is a second cross-sectional view of a specular reflector in accordance with an embodiment of the present invention;

3 is a surface view of a specular reflector in accordance with an embodiment of the present invention;

4 is a schematic structural diagram of a wireless terminal antenna device according to an embodiment of the present invention.

Preferred embodiment of the present invention

In order to solve the problem that the correlation coefficient between the antennas is high in the prior art, the embodiment of the present invention provides a specular reflector and a wireless terminal antenna device. The embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The antenna and the antenna have an ECC (correlation coefficient) index. In the embodiment of the present invention, a specular reflector is designed between the antenna and the antenna, and the radiation direction of the antenna is reflected back along the original direction, thereby reducing the relationship between the antenna and the antenna. The mutual entanglement also improves the isolation between the antennas. The technical solutions of the embodiments of the present invention are described below.

This embodiment provides a specular reflector disposed between two antennas. 1 is a cross-sectional view of a specular reflector according to an embodiment of the present invention. As shown in FIG. 1, the inside of the specular reflector 1 is designed as a multilayer structure (optionally, the multilayer structure is a bilaterally symmetric structure, and the multilayer is Three or more layers); a metal floor 2 is disposed in the middle of the specular reflector 1, and a different metal patch 3 is disposed on each layer except the metal floor 2, and the metal patch 3 is connected to the metal through the metal via 4 On the floor 2.

Optionally, in the embodiment, the metal patch 3 includes: an inner metal patch 3a, and/or an outer metal patch 3b, and an inner metal patch 3a and an outer metal patch 3b. A cross-sectional view of the specular reflector as shown in FIG.

Optionally, in the specular reflector 1, in addition to the metal floor 2, the multilayer structure, the metal patch 3, The remainder of the metal via 4 is filled with the medium 8.

Alternatively, the specular reflector 1 can be placed at an intermediate position between the two antennas. It can also be adjusted according to the needs of the layout.

Optionally, the specular reflector 1 is fixed on the main board, and the connection manner thereof may be a plug-in type or a spring piece contact type. If the connection mode is plug-in type, the metal floor 2 is provided with a metal pin 6 at the bottom, and the metal pin 6 is fixed to the main board through the positioning hole.

Optionally, the specular reflector 1 is suitable for a PCB (Printed Circuit Board) antenna or a bracket antenna.

Optionally, the different metal patches 3 include the inner metal patch 3a and/or the outer metal patch 3b, and FIG. 3 is a surface view of the specular reflector according to the embodiment of the present invention. The position of the sheet 3b is as shown in FIG.

Optionally, when the specular reflector 1 is designed as a PCB board, the x-axis direction in FIGS. 1 to 3 is the thickness direction of the PCB board, the y-axis direction is the length direction of the PCB board, and the z-axis direction is the PCB board. The width direction of the metal floor, that is, the middle interlayer of the PCB board, the axial direction of the metal via hole is the thickness direction of the PCB board, and the surface of the outer metal patch is flush with the outer surface of the PCB board.

By using the above specular reflector, the radiation pattern of the antenna can be changed, the inter-winding between the antenna and the antenna can be reduced, the ECC value can be effectively reduced, and the impedance bandwidth can be further adjusted by designing different patch sizes, so that the structure can work differently. Frequency band.

The embodiment also provides a wireless terminal antenna device. FIG. 4 is a schematic structural diagram of a wireless terminal antenna device according to an embodiment of the present invention. As shown in FIG. 4, the device includes the specular reflector 1 introduced in the above embodiment. a main board 5, and a first antenna 9 and a second antenna 10 fixed to the main board 5; wherein the specular reflector 1 is located between the first antenna 9 and the second antenna 10, and is fixed by a metal pin 6 at the bottom The positioning hole 7 of the main board 5 is on.

Simulation and physical test results show that the antenna has better transmission performance and radiation characteristics, meeting the design requirements of broadband characteristics. It is thus possible to achieve a specific electrical length over a small physical length. This new structure is utilized in the design of the antenna, which can effectively reduce the ECC index of the antenna.

The embodiments of the present invention are further described in detail below by way of examples.

This example is a wireless terminal product with LTE data, CDMA voice, GPS positioning and WIFI function. There are 8 antennas: LTE main, sub-antenna, CDMA antenna, GPS antenna, WIFI2.4G antenna (two), WIFI5.8G antenna (two). The layout of these 8 antennas is a difficult point in the overall design. The mutual interference between the antenna and the antenna is very serious in a limited physical space.

Design a metal specular reflection structure, which is a bilateral symmetrical structure. In this design, a four-layer structure is used, and there are two layers on the left and right sides. The middle is a metal floor with metal pins on the bottom and soldered to the main board. Different metal patches are designed for each layer except the intermediate layer, which are connected to the intermediate metal floor through metal vias.

The surface of the structure has a high impedance and can realize the in-phase reflection of electromagnetic waves in a specific frequency band, that is, the phase difference between the reflected wave and the incident wave is zero. In-phase reflection increases the antenna radiant energy and is able to shield part of the interference. The resonant frequency of the structure is consistent with the operating frequency of the antenna. In the whole design, a wide in-phase reflection bandwidth needs to be obtained, and the cell structure of the structural surface must be repeatedly adjusted according to the center frequency.

Taking the WIFI band as an example, in the actual measurement, the original test value of the correlation coefficient of the two WIFI 2.4G antennas is 0.82. After inserting the specular reflection structure between the antennas, the ECC test value is reduced to 0.24, which satisfies the operator's Requirements, to achieve the purpose of the design.

The embodiment of the present invention relates to a scheme for reducing the antenna correlation coefficient, which can effectively solve the technical problem that the correlation coefficient between the antennas of the current LTE terminal products is high under a limited physical size. Especially suitable for current LTE products.

The above description is only one embodiment of the utility model applied to the wireless access product, and within the spirit and principle of the present invention, the connection manner of the specular reflection structure, the design layer number, the metal small patch shape Any modifications, equivalent substitutions, improvements, etc., etc., are intended to be included within the scope of the present invention.

Although the embodiments of the present invention have been disclosed for purposes of illustration, those skilled in the art will recognize that various modifications, additions and substitutions are possible. Therefore, the scope of the present invention should not be limited to the embodiments described above.

Industrial applicability

Compared with the related art, the solution of the embodiment of the present invention can reduce the correlation between the antenna and the antenna, and solve the problem that the correlation coefficient between the antennas is high in the related art. Moreover, the utility model has the advantages of simple structure, small size, convenient integration with the mobile phone circuit board, low cost, convenient mass production, and the like, and can be applied to various terminal systems.

Claims

A specular reflector disposed between two antennas, the specular reflector (1) being a multi-layer structure;

A metal floor (2) is disposed in the middle of the specular reflector (1), and different metal patches (3) are disposed on each layer except the metal floor (2), and the metal patch (3) passes through the metal A via (4) is attached to the metal floor (2).
The specular reflector of claim 1 wherein:

The specular reflector (1) is placed at an intermediate position between the two antennas.
The specular reflector of claim 1 wherein:

The specular reflector (1) is fixed on the main board (5), and the connection manner is a plug-in type or a spring piece contact type.
The specular reflector according to claim 3, wherein when the connection mode is a plug-in type, the bottom of the metal floor (2) is provided with a metal pin (6), and the metal pin (6) passes through the positioning hole. (7) is fixed to the main board (5).
A specular reflector according to claim 1 wherein said different metal patches (3) comprise an inner metal patch (3a) and/or an outer metal patch (3b).
A specular reflector according to claim 1, wherein in said specular reflector (1), in addition to said metal floor (2), a multilayer structure, said metal patch (3), said metal The remainder of the hole (4) is filled with the medium (8).
The specular reflector according to claim 1, wherein the multilayer structure is a left-right symmetric structure, and the plurality of layers are three or more layers.
A specular reflector according to claim 1, wherein the specular reflector (1) is suitable for a printed circuit board PCB antenna or a bracket antenna.
A wireless terminal antenna device, comprising the specular reflector (1) according to any one of claims 1 to 8, a main board (5), and a first antenna fixed to the main board (5) ( 9), a second antenna (10);

The specular reflector (1) is located between the first antenna (9) and the second antenna (10) and is fixed on the main board (5).