WO2018120709A1

WO2018120709A1 - Triple-band ultra-wideband base station antenna

Info

Publication number: WO2018120709A1
Application number: PCT/CN2017/091035
Authority: WO
Inventors: 周献庭; 杨元海; 任现敏; 董政
Original assignee: 深圳国人通信股份有限公司
Priority date: 2016-12-28
Filing date: 2017-06-30
Publication date: 2018-07-05

Abstract

A triple-band ultra-wideband base station antenna, comprising a reflection plate, radiation arrays arranged on the front face of the reflection plate and a feed network arranged on the back face of the reflection plate, wherein the radiation arrays are connected to the feed network; the radiation arrays comprise a low-frequency radiation array and two high-frequency radiation arrays; the two high-frequency radiation arrays are symmetrically distributed on the two sides of the low-frequency radiation array; the low-frequency radiation array comprises N low-frequency radiation units, wherein the N low-frequency radiation units are arranged on the front face of the reflection plate at intervals in the longitudinal direction of the reflection plate; and each high-frequency radiation array comprises (2N+1) high-frequency radiation units, wherein the (2N+1) high-frequency radiation units are arranged on the front face of the reflection plate at intervals in the longitudinal direction of the reflection plate, and N is a positive integer which is greater than or equal to 1. In the present invention, the antenna has a compact structure, a small size and a light weight, and has better radiation performance and circuit performance.

Description

Three-frequency ultra-wideband base station antenna

[0001] The present invention relates to the field of mobile communication base station antennas, and in particular, to a three-frequency ultra-wideband base station antenna.

[0002] In recent years, with the rapid increase in the number of mobile users, the communication system is constantly updating and expanding, and higher and higher requirements are placed on the design of the antenna. On the one hand, the antenna is required to be broadband and multi-frequency, and the same is satisfied. Communication requirements of multiple systems; on the other hand, it is required to implement multiple systems to share antennas to reduce interference between antennas and reduce costs. At present, the tri-band UWB antenna is one of the commonly used multi-system antennas in the base station antenna system.

The core problem of the design of the three-band ultra-wideband base station antenna is to continuously optimize the implementation form of the antenna, including the design of the radiating element and the optimization of the reflection boundary, so that the antenna is compact, small in size, light in weight, and has excellent radiation performance. Broadband characteristics to meet new specifications.

technical problem

Problem solution

Technical solution

[0003] The object of the present invention is to overcome the deficiencies of the above techniques and to provide a three-frequency ultra-wideband base station antenna which is compact in structure, small in size, light in weight, and has better radiation performance and circuit performance.

[0004] A three-band ultra-wideband base station antenna includes a reflector, a radiation array disposed on a front surface of the reflector, and a feed network disposed on a back surface of the reflector, wherein the radiation array is connected to the feed network The radiation array includes a low frequency radiation array and two high frequency radiation arrays, the two high frequency radiation arrays are symmetrically distributed on both sides of the low frequency radiation array; and the low frequency radiation array includes N low frequency radiation units. The N low frequency radiating elements are disposed on a front surface of the reflecting plate along a longitudinal interval of the reflecting plate; each of the high frequency radiation arrays includes 2N+1 high frequency radiating elements, and the 2N+1 high frequency Radiation units are disposed on a front surface of the reflector along a longitudinal interval of the reflector; the N is a positive integer greater than or equal to one.

[0005] Further, a phase center of the high frequency radiation array is located at a phase center of the low frequency radiation array On the same level.

[0006] Further, each of the two sides of the high frequency radiation array is respectively provided with a metal rim, and the two metal rims are fixed to the front surface of the reflector and are symmetric about the array of high frequency radiation, and Not in contact with the low frequency radiation unit.

[0007] Further, a spacing between the two metal rims is greater than a diameter of the corresponding high frequency radiation unit of the high frequency radiation array.

[0008] Further, in the low frequency radiation array, a spacing between two adjacent low frequency radiating elements is a spacing between two adjacent high frequency radiating elements in the high frequency radiation array 2.5 times.

[0009] Further, an L-shaped metal spacer is disposed between two adjacent low-frequency radiating units, and the L-shaped metal spacer is fixed to a front surface of the reflector.

[0010] Further, the L-shaped metal spacer includes a horizontal portion and a vertical portion fixed to a front surface of the reflector

One end of the horizontal portion is connected to the vertical portion, and the other end faces one of the high frequency radiation arrays.

[0011] Further, the N low frequency radiation units include a central low frequency radiation unit, and two sides of the two low frequency radiation units adjacent to the central low frequency radiation unit are respectively provided with Z-shaped metal isolation strips, and the Z A metal spacer is attached to the front side of the reflector and is located between adjacent two of the high frequency radiating elements on the corresponding side.

[0012] Further, a metal guiding piece is disposed above the high frequency radiation unit.

[0013] Further, the longitudinal sides of the reflector are respectively folded toward the front surface of the reflector to form a vertical flange.

Advantageous effects of the invention

Beneficial effect

[0014] The present invention has a simple structure, is easy to assemble, and has low cost. The arrangement of the low frequency radiation array and the two high frequency radiation arrays are arranged side by side, and the mutual influence between the high frequency band and the low frequency band is small, and the high frequency band and the low frequency are low. The frequency bands have good front-to-back ratio, cross-polarization ratio characteristics, horizontal beamwidth convergence, high-isolation and other good circuit performance, ensuring that the antenna can be obtained in a small size to meet the current multi-frequency of mobile communication systems. Antenna indicator requirements.

Brief description of the drawing

DRAWINGS 1 is a perspective view of a three-frequency ultra-wideband base station antenna according to an embodiment of the present invention;

2 is a top plan view of the three-frequency ultra-wideband base station antenna shown in FIG. 1; [0016] FIG.

3 is a side view of the three-frequency ultra-wideband base station antenna shown in FIG. 1;

4 is a perspective view of a three-frequency ultra-wideband base station antenna according to another embodiment of the present invention;

5 is a top plan view of the three-frequency ultra-wideband base station antenna shown in FIG. 4.

Embodiments of the invention

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Referring to FIG. 1, FIG. 2 and FIG. 3, the present invention provides a three-frequency ultra-wideband base station antenna including a reflector 1, a radiation array disposed on the front surface of the reflector 1, and a feed disposed on the back of the reflector 1. The internet. The reflecting plate 1 is a metal reflecting plate. The longitudinal side edges of the reflecting plate 1 are respectively folded toward the front surface of the reflecting plate 1 to form a vertical flange 1 1 . The feed network is used to provide parallel feeds to the radiation array.

[0022] The radiation array comprises a low frequency radiation array 2 and two high frequency radiation arrays 3. The low-frequency radiation array 2 operates in the 790MHz-960MHz band, and the high-frequency radiation array ij3 operates in the 1710MHz-2690MHz band. The low frequency radiation array 2 is disposed on the longitudinal axis of the front surface of the reflector 1. Two high frequency radiation arrays 3 are symmetrically distributed on both sides of the low frequency radiation array 2. The phase center of the high frequency radiation array 3 is on the same horizontal line as the phase center of the low frequency radiation array 2.

[0023] In the present embodiment, the low frequency radiation array 2 includes three low frequency radiation units 21, and three low frequency radiation units 21 are disposed on the front side of the reflection plate 1 along the longitudinal interval of the reflection plate 1, specifically, three low frequency radiation units 21 The spacing is provided on the longitudinal axis of the front side of the reflector 1. The low frequency radiating element 21 uses a square bowl type of dual polarization die-casting vibrator, and each polarization is composed of two dipoles connected in parallel. Each of the high frequency radiation arrays 3 includes seven high frequency radiation units 31. Seven high-frequency radiating elements 31 are disposed on the front surface of the reflecting plate 1 along the longitudinal interval of the reflecting plate 1. Specifically, the high-frequency radiating unit 31 is fixed to the front surface of the reflecting plate 1 by fasteners such as screws, screws, nuts, and the like. The high frequency radiating element 31 employs a dual polarized die cast vibrator.

[0024] In the low-frequency radiation array 2, the spacing between adjacent two low-frequency radiating elements 21 is 2.5 times the spacing between two adjacent high-frequency radiating elements 31 in the high-frequency radiation array 3. Specifically, in this embodiment, the spacing between two adjacent low frequency radiating elements 21 is 300 mm, and the spacing between adjacent two high frequency radiating elements 31 in the high frequency radiating array 3 is 120 mm. [0025] An L-shaped metal spacer 5 is disposed between the adjacent two low-frequency radiating elements 21, and the L-shaped metal spacer 5 is fixed to the front surface of the reflecting plate 1. The center of the L-shaped metal spacer 5 is on the same horizontal line as the center of the low-frequency radiation unit 21. The L-shaped metal spacer 5 includes a horizontal portion 51 fixed to the front surface of the reflecting plate 1 and a vertical portion 52. One end of the horizontal portion 51 is connected to the vertical portion 52, and the other end faces the one of the high-frequency radiation arrays 3.

[0026] The three low frequency radiating elements 21 include a central low frequency radiating unit 211, and two sides of the two low frequency radiating elements 21 adjacent to the central low frequency radiating unit 211 are respectively provided with Z-shaped metal separating strips 6, Z-shaped metal separating strips. 6 is fixed to the front surface of the reflecting plate 1 and located between the adjacent two high-frequency radiating elements 31 on the corresponding side, and may be an intermediate position between the adjacent two high-frequency radiating elements 31 on the corresponding side. The center of the Z-shaped metal spacer 6 is on the same horizontal line as the center of the corresponding low-frequency radiation unit 21. The Z-shaped metal spacer 6 includes a first horizontal portion fixed to the front surface of the reflecting plate 1, an inclined portion connected to one end of the first horizontal portion, and a second horizontal portion, and one end of the second horizontal portion is connected to the end portion of the inclined portion. The other end of the first horizontal portion faces the adjacent vertical flange 11 and the other end of the second horizontal portion faces the adjacent low frequency radiating unit 21.

[0027] Each of the two sides of the high-frequency radiation array 3 is respectively provided with a metal rim 4, and the two metal rims 4 are fixed to the front surface of the reflecting plate 1 and are symmetrical with respect to the high-frequency radiation array 3, and are not combined with the low-frequency radiation unit 21. contact. The shape of the metal rim 4 is approximately U-shaped. There is a gap between the metal rim 4 adjacent to the vertical gusset 11 of the reflecting plate 1 and the vertical burr 11, and the height of the metal rim 4 is smaller than the height of the vertical burr 11. The spacing between the two metal rims 4 is greater than the aperture of the high frequency radiating element 31 of the corresponding high frequency radiation array 3.

[0028] A metal guiding piece 32 is provided above the high frequency radiation unit 31. The metal guiding piece 32 has a circular shape. Specifically, the metal guiding piece 32 is fixed to the directly above the high frequency radiating unit 31 by a fastener. The fastener is, for example, a screw or the like.

[0029] The vertical flange 11, the L-shaped metal spacer 5, and the Z-shaped metal spacer 6 of the reflector 1 are mainly used to adjust the radiation pattern of the low-frequency radiation array 2, thereby achieving the adjustment of the radiation characteristics of the low frequency band. The vertical flange 11, the metal rim 4, and the metal guide 32 of the reflector 1 are mainly used to adjust the radiation pattern of the high frequency radiation array 3, thereby achieving the adjustment of the radiation characteristics of the high frequency band. Thus, by reasonably adjusting the width of the reflecting plate 1, the height of the vertical flange 11, the size of the L-shaped metal spacer 5, and the position and size of the Z-shaped metal spacer 6, the antenna has better radiation characteristics in the low frequency band. . By reasonably adjusting the height of the vertical flange 11, the spacing between the two metal rims 4 on the same side, the size of the metal rim 4, the position and height of the metal directional sheet 32, the antenna can be made in the high frequency band. Can obtain good radiation characteristics and coordinate the size of all structures It can effectively reduce the mutual coupling sound between the high frequency band and the low frequency band, and obtain a good S parameter index.

Referring to FIG. 4 and FIG. 5, in another embodiment, different from the above embodiment, the low frequency radiation array 2 includes five low frequency radiation units 21, and the five low frequency radiation units 21 are spaced along the longitudinal direction of the reflection plate 1. It is disposed on the front side of the reflecting plate 1. Each of the high frequency radiation arrays 3 includes eleven high frequency radiation units 31. Eleven high-frequency radiating elements are disposed on the front surface of the reflecting plate 1 along the longitudinal direction of the reflecting plate 1.

[0031] The five low frequency radiating elements 21 include a central low frequency radiating unit 211, and two sides of the two low frequency radiating elements 21 adjacent to the central low frequency radiating unit 211 are respectively provided with Z-shaped metal separating strips 6, Z-shaped metal separating strips. 6 is fixed to the front surface of the reflecting plate 1 and located between the adjacent two high-frequency radiating elements 31 on the corresponding side.

[0032] If the number of low frequency radiating elements of the low frequency radiation array 2 is represented by N, the number of high frequency radiating elements 31 of each high frequency radiation array 3 is 2N+1, that is, the low frequency radiation array 2 includes N The low frequency radiation unit 21, each of the high frequency radiation arrays 3 includes 2N+1 high frequency radiation units 31, N being a positive integer greater than or equal to one.

[0033] The present invention adopts a side-by-side arrangement of a low-frequency radiation array 2 and two high-frequency radiation arrays 3, which fully ensures the spacing of the high-frequency radiation unit 31, and ensures the high-frequency radiation unit 31 and the low-frequency radiation unit 2 The mutual influence between 1 is small, thus ensuring the electrical performance of the high frequency band and the low frequency band, so that both the high frequency band and the low frequency band have good front-to-back ratio and cross-polarization ratio characteristics, the horizontal beam width converges, and the same height is high. Good circuit performance such as isolation ensures that the antenna can meet the requirements of the current mobile communication system for multi-frequency antennas in a small size.

[0034] The invention has the advantages of simple structure, easy assembly, stable performance and low cost.

[0035] The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the description of the invention is not intended to limit the scope of the invention. It should be noted that various modifications and improvements can be made by those skilled in the art without departing from the inventive concept, such as combining different features in the various embodiments, and the like. The scope of protection of the present invention.

Claims

Claim

A three-band ultra-wideband base station antenna includes a reflector, a radiation array disposed on a front surface of the reflector, and a feed network disposed on a back surface of the reflector, wherein the radiation array is coupled to the feed network, and wherein: The radiation array includes a low frequency radiation array and two high frequency radiation arrays, the two high frequency radiation arrays are symmetrically distributed on both sides of the low frequency radiation array; the low frequency radiation array includes N low frequency radiation units, the N The low frequency radiating elements are disposed on the front side of the reflecting plate along the longitudinal interval of the reflecting plate; each of the high frequency radiation arrays comprises 2N+1 high frequency radiating elements, and the 2N+1 high frequency radiating elements are along The longitudinal spacing of the reflectors is disposed on a front side of the reflector; the N is a positive integer greater than or equal to one.

The three-frequency ultra-wideband base station antenna according to claim 1, wherein: a phase center of said high frequency radiation array is located on a same horizontal line as a phase center of said low frequency radiation array.

The three-frequency ultra-wideband base station antenna according to claim 1, wherein: each of the two sides of the high-frequency radiation array is respectively provided with a metal rim, and the two metal rims are fixed to the reflector The front side is symmetric with respect to the array of high frequency radiation and is not in contact with the low frequency radiating element.

The three-frequency ultra-wideband base station antenna according to claim 3, wherein: the spacing between the two metal rims is greater than the aperture of the corresponding high-frequency radiation unit of the high-frequency radiation array.

The triple-band ultra-wideband base station antenna according to claim 1, wherein: in the low-frequency radiation array, a spacing between two adjacent low-frequency radiating elements is adjacent to the high-frequency radiation array 2.5 times the spacing between the two high frequency radiating elements.

The three-frequency ultra-wideband base station antenna according to claim 1, wherein: an L-shaped metal spacer is disposed between two adjacent low-frequency radiating units, and the L-shaped metal spacer is fixed to the reflection The front of the board.

The three-frequency ultra-wideband base station antenna according to claim 6, wherein: the L-shaped metal spacer includes a horizontal portion and a vertical portion fixed to a front surface of the reflector, the level One end connected to the vertical portion and the other end facing one of the high frequency radiation arrays

[Claim 8] The tri-band ultra-wideband base station antenna according to claim 1, wherein: said N low-frequency radiating elements comprise a central low-frequency radiating unit, and two low-frequency adjacent to said central low-frequency radiating unit The two sides of the radiation unit are respectively provided with Z-shaped metal spacers, and the Z-shaped metal spacers are fixed to the front surface of the reflector and located between two adjacent high-frequency radiation units on the corresponding side.

[Claim 9] The tri-band ultra-wideband base station antenna according to claim 1, wherein a metal guiding piece is disposed above the high-frequency radiating element.

[Claim 10] The three-frequency ultra-wideband base station antenna according to claim 1, wherein: the longitudinal side edges of the reflecting plate are respectively folded toward the front surface of the reflecting plate to form a vertical flange.