WO2012122815A1

WO2012122815A1 - Dual-polarized broadband radiation unit and array antenna

Info

Publication number: WO2012122815A1
Application number: PCT/CN2011/082296
Authority: WO
Inventors: 黄定邦; 程茂林; 张趁意
Original assignee: 京信通信系统（中国）有限公司
Priority date: 2011-03-17
Filing date: 2011-11-16
Publication date: 2012-09-20
Also published as: CN102157783A

Abstract

Disclosed is a dual-polarized broadband radiation unit, including: a metal reflection plate, an unbalance-balance feed connector mounted on the metal reflection plate, a connection element connected to the unbalance-balance feed connector, and two pairs of arc radiation unit arms mounted on the top of the unbalance-balance feed connector, with the two pairs of arc radiation unit arms being in the same plane. An array antenna formed by the foregoing dual-polarized broadband radiation unit is also disclosed. According to the present invention, excellent port separation characteristics and excellent cross polarization discrimination can be obtained; moreover, the present invention has the advantages of a simple and compact structure and high performance, and it is easy to manufacture, low in cost and convenient to assemble and mount.

Description

Dual-polarized broadband radiating element and array antenna

Technical field

The present invention relates to the field of mobile communication base station antennas, and more particularly to a dual-polarized broadband radiating element and an array antenna composed of dual-polarized broadband radiating elements.

Background technique

With the rapid development of mobile communication, the new generation of LTE (Long Term Evolution; LTE) and WiMAX's 4G mobile wireless broadband technology, with the new wave of communication technology changes continue to advance. Under the new generation of mobile communication systems, multiple systems and multiple systems coexist. Future 4G technologies are still developing in frequency bands and systems such as LTE, Wimax, and Wlan. All of these require the antenna to be shared by multiple systems to save the site installation resources of the base station and reduce the network construction cost. The development of broadband antenna units is the basis for base station antenna design.

The market demands an antenna with a frequency of 1710MHz-2690MHz with a bandwidth of 44.5%, requiring a full-band VSWR of less than 1.4 and a two-port isolation requirement of greater than 30. Such a wideband antenna has a wider bandwidth than conventional base station antennas, and the VSWR requirements of the antenna are also extremely strict, so that a high challenge is presented in design difficulty.

The radiating element of the array antenna largely determines the multiple performance of the antenna. A mature unit design not only requires good electromagnetic characteristics, such as meeting the bandwidth characteristics, high radiation efficiency, and requires a reasonable structure, easy processing and installation; Not only can improve the electrical performance of the antenna, but also facilitate the realization of the shape of the lobes. The boundary conditions play a decisive role in the beam convergence and isolation of the dual-polarized antenna. Dual-polarized radiating elements are also required to have good cross-polarization performance, and the isolation between the two polarizations also places high demands. Therefore, under the premise of designing high-performance radiation units, the choice of boundary conditions is also an important issue.

technical problem

It is an object of the present invention to provide a dual-polarized broadband radiating element having a simple structure, a high frequency bandwidth, and a high isolation, and an array antenna composed of a dual-polarized broadband radiating element.

Technical solution

To achieve the object, the present invention adopts the following technical solution: a dual-polarized broadband radiating unit comprising: a metal reflector, an unbalanced-balanced feed connector mounted on a metal reflector, and an unbalanced-balanced feed A connector connecting connector and two pairs of arcuate radiating element arms mounted on top of the unbalanced balanced feeder connector, the two pairs of arcuate radiating element arms being in the same plane. The invention also discloses an array antenna composed of the aforementioned dual-polarized broadband radiating unit.

An array antenna includes a housing and a plurality of dual-polarized broadband radiating units mounted in the housing, the housing having a bottom plate and a pair of side plates bent from two longitudinal sides of the bottom plate, the plurality of bipolar The broadband radiating unit is mounted on one of the side panels. The dual-polarized broadband radiating unit comprises: a metal reflector, an unbalanced-balanced feed connector mounted on the metal reflector, a connecting component connected to the unbalanced-balanced feed connector, and an unbalanced-balanced installation Two pairs of arc-shaped radiating element arms on the top of the feed connector, the two pairs of arc-shaped radiating element arms are located in the same plane.

Beneficial effect

Compared with the prior art, the present invention has the advantages of being able to obtain good port isolation characteristics and good cross polarization discrimination rate. And it has the advantages of simple and compact structure and high performance, and is easy to manufacture, low in cost and convenient in assembly and installation.

DRAWINGS

Figure 1 is a perspective view of a dual polarized broadband radiating element of the present invention;

Figure 2 is a side view of the dual polarized broadband radiating element of the present invention;

Figure 3 is a perspective view of the dual polarized broadband radiating element of the present invention as viewed from the top;

4 is a top plan view of a dual polarized broadband radiating element of the present invention;

Figure 5 is a perspective structural view of an array antenna constructed according to the dual-polarized broadband radiating unit shown in Figures 1-4;

Figure 6 is a diagram showing a polarization port voltage standing wave ratio pattern of the array antenna of the present invention;

Figure 7 is a diagram showing a polarization port voltage standing wave ratio pattern of the array antenna of the present invention;

Figure 8 is a graph showing the isolation between two polarizations of the array antenna of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

1-4 illustrate the detailed structure of a dual polarized broadband radiating element 100 provided by the present invention, which is shown as a constituent unit of a dual polarized array antenna. The dual-polarized broadband radiating unit 100 includes a metal reflector 10, an unbalanced-balanced feeder connector 20 mounted on the metal reflector 10, a connecting component 30 connected to the unbalanced-balanced feeder connector 20, and mounted on the Unbalanced-balanced two pairs of arcuate radiating element arms 40 on top of the feed connector 20.

The unbalanced-balanced feed connector 20 has an outer conductor 22, and the outer conductor 22 is mounted on the metal reflector 10. The outer conductor 22 supports and electrically connects the radiating element arms 40 while feeding the radiating element arms 40. The bottom end of the unbalanced-balanced feed connector 20 is provided with a solder tab 24 for soldering the cable, and the solder tab 24 passes through the metal reflector 10 to connect the array network.

The two pairs of arc-shaped radiating element arms 40 are located in the same plane. And the height between each of the radiating element arms 40 and the metal reflector 10 is one quarter of the wavelength of the central operating frequency.

Each of the arcuate radiating element arms 40 is a circular arc-like solid structure, and the arm width of the radiating unit arm 40 extends from wide to narrow to the outer conductor 22 of the unbalanced-balanced feed connector 20, and The outer conductor 22 is electrically connected.

At the same time, any two non-adjacent two arc-shaped radiating element arms 40 of the two pairs of arc-shaped radiating element arms 40 are symmetrically distributed around the center of the unbalanced-balanced feed connector 20, and Two non-adjacent radiating element arms 40 form a radiation symmetric vibrator as a major component of microwave energy radiation. The arc area of the radiating unit arm 40 is 0.48 of the working frequency of the working frequency center. x 0.48 times wavelength. Preferably, at least one anti-slip track 42 is formed on the surface of each of the radiating element arms 40.

The connecting member 30 includes a plurality of feed sheets 36, a chuck 34 mounted on each of the feed sheets 36, and a fixed block 32 disposed between the plurality of feed sheets 36. The feed piece 36 has a meandering shape including a horizontal portion 362 and a vertical portion 364 connected to the horizontal portion 362. The chuck 34 is mounted on the vertical portion 364. The feed piece 36 couples the integral radiating element 100 to achieve a slave unbalanced feed (such as a coaxial feed) The conversion of the balanced feed is performed and the impedance matching is performed by the different widths of the feed piece 36. The feed piece 36 is secured to the unbalanced-balanced feed connector 20 by a fixed block 32 and a chuck 34 mounted on a vertical portion 364 of the feed piece 36.

Referring to FIGS. 5-8, an array antenna 200 in accordance with the present invention includes a housing 300 and a plurality of dual polarized broadband radiating elements 100 mounted within the housing 300. The housing 300 has a bottom plate 302 and a pair of side plates 304 bent from the longitudinal sides of the bottom plate 302. The plurality of dual polarized broadband radiating elements 100 are mounted on one of the side panels 304. A transverse partition 306 is laterally mounted on each of the dual polarized broadband radiating elements 100. Preferably, a longitudinal partition 308 is mounted between adjacent two transverse partitions 306. Further preferably, a spacer 301 which is inclined at both ends is obliquely mounted on the horizontal partition 306 which is connected to a double-polarized broadband radiating unit 100 near the intermediate position on the casing 300, and is disposed on the inclined spacer 301. The spacer 301 is fixed by the plastic cylinder 303 and the screw 305 on the lower partition 306. This can increase the isolation between the polarizations of the array antenna 200 without affecting the performance of the pattern.

Referring to Figures 6-8, the array antenna 200 constructed by the dual-polarized radiating element 100 of the present invention has a good pattern for the full frequency band. In the 1710~2690MHz frequency band, the voltage standing wave ratio is less than 1.4, the isolation is greater than 30dB, and the measured gain of the 6-cell is between 15dBi and 16dBi. The horizontal 3dB beamwidth is 60 degrees to 71 degrees, the spindle cross polarization ratio is greater than 18 dB, and the cross polarization ratio is greater than 10 dB at ±60 degrees. The environmental test is qualified and can meet the requirements of the mobile communication system.

It is easy to see that the antenna manufactured according to the present invention has the advantages of simple and compact structure and high performance, and is easy to manufacture and convenient for installation and use. Moreover, compared with the main forms of the current similar products, the bandwidth, cross-polarization ratio and isolation performance of the present invention are good.

The above embodiments are preferred embodiments of the present invention, but are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and scope of the present invention should be Equivalent replacement means are included in the scope of protection of the present invention.

Embodiments of the invention

Industrial applicability

Sequence table free content

Claims

A dual-polarized broadband radiating unit characterized by comprising: a metal reflector, an unbalanced-balanced feed connector mounted on the metal reflector, a connection component connected to the unbalanced-balanced feed connector, and mounted on the Two pairs of arcuate radiating element arms at the top of the balanced-balanced feed connector, the two pairs of arcuate radiating element arms being in the same plane.
A dual-polarized broadband radiating unit according to claim 1, wherein said unbalanced-balanced feed connector has an outer conductor, and said outer conductor is mounted on a metal reflector, said outer conductor being in a pair While the radiating unit arm feeds, the radiating unit arm is supported and electrically connected, and the bottom end of the unbalanced balanced feeder connector is provided with a soldering piece for soldering the cable, and the soldering piece passes through the metal reflecting plate.
The dual-polarized broadband radiating unit according to claim 2, wherein each of the arc-shaped radiating element arms is a circular arc-like solid structure, and an arm width of the radiating unit arm extends from wide to narrow to The unbalanced-balanced feed connector has an outer conductor and is electrically connected to the outer conductor.
The dual-polarized broadband radiating unit according to claim 3, wherein any two non-adjacent two arc-shaped radiating element arms of the two pairs of arc-shaped radiating element arms surround the unbalanced-balanced feed The center of the electrical connector is symmetrically distributed in the center.
The dual-polarized broadband radiating unit according to claim 4, wherein at least one anti-slip line is formed on a surface of each of the radiating element arms.
The dual-polarized broadband radiating unit according to claim 5, wherein said connecting member comprises a plurality of feeding sheets, a chuck mounted on each of the feeding sheets, and a plurality of feeding sheets disposed between the plurality of feeding sheets Fixed block.
The dual-polarized broadband radiating unit according to claim 6, wherein the feeding piece has a meandering shape, and includes a horizontal portion and a vertical portion connected to the horizontal portion; the chuck is mounted on the vertical portion; The feed piece is secured to the unbalanced-balanced feed connector by a fixed block and a chuck mounted on a vertical portion of the feed piece.
An array antenna includes a housing and a plurality of dual-polarized broadband radiating units mounted in the housing, the housing having a bottom plate and a pair of side plates bent from two longitudinal sides of the bottom plate, the plurality of bipolar The broadband radiating unit is mounted on one of the side plates, wherein the dual-polarized broadband radiating unit comprises: a metal reflector, an unbalanced-balanced feed connector mounted on the metal reflector, and A balance-balanced feed connector-connecting connecting member and two pairs of arc-shaped radiating element arms mounted on top of the unbalanced-balanced feed connector, the two pairs of arc-shaped radiating element arms being located in the same plane.
The array antenna according to claim 8, wherein each of the dual-polarized broadband radiating elements is laterally mounted with a diaphragm.
The array antenna according to claim 9, wherein a vertical partition is installed between the adjacent two horizontal partitions.
The array antenna according to claim 9, wherein a spacer which is inclined at both ends is mounted on a lateral partition between two dual-polarized broadband radiating elements adjacent to the intermediate position on the casing. The spacers are fixed by the cylinders and screws provided on the diaphragms below the diagonal spacers.