A Decoupling Method for ±45°-Polarized Crisscross-Shaped Dipole Antenna Array

YUAN Hang; CHEN Fu-chang; XIANG Kai-ran

doi:10.12263/DZXB.20250172

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A Decoupling Method for ±45°-Polarized Crisscross-Shaped Dipole Antenna Array

PAPERS | 更新时间：2025-12-10

- A Decoupling Method for ±45°-Polarized Crisscross-Shaped Dipole Antenna Array
- ACTA ELECTRONICA SINICA Vol. 53, Issue 7, Pages: 2453-2460(2025)
- 作者机构：
  
  华南理工大学电子与信息学院，广东广州 510641
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(62471186);Science and Technology Planning Project of Guangzhou City(2024A04J6306)
- DOI：10.12263/DZXB.20250172
  CLC： TN821+.8;
- Received：09 March 2025，
  
  Revised：2025-07-07，
  
  Published：25 July 2025
- 稿件说明：
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袁航, 陈付昌, 向凯燃. 一种用于±45°极化十字型偶极子天线阵列的解耦方法[J]. 电子学报, 2025, 53(07): 2453-2460.

YUAN Hang, CHEN Fu-chang, XIANG Kai-ran. A Decoupling Method for ±45°-Polarized Crisscross-Shaped Dipole Antenna Array[J]. Acta Electronica Sinica, 2025, 53(07): 2453-2460.
袁航, 陈付昌, 向凯燃. 一种用于±45°极化十字型偶极子天线阵列的解耦方法[J]. 电子学报, 2025, 53(07): 2453-2460. DOI：10.12263/DZXB.20250172

YUAN Hang, CHEN Fu-chang, XIANG Kai-ran. A Decoupling Method for ±45°-Polarized Crisscross-Shaped Dipole Antenna Array[J]. Acta Electronica Sinica, 2025, 53(07): 2453-2460. DOI：10.12263/DZXB.20250172

摘要

本文研究了一种适用于±45°极化的十字型偶极子天线阵列的解耦方法，主要基于一个共线排布的天线阵列进行讨论，天线在1.7~2.3 GHz的带宽范围内驻波比小于1.5.2个±45°极化共线排布的十字型偶极子天线之间的相互耦合可以分解为3种耦合类型：E面共极化耦合（E耦合）、H面共极化耦合（H耦合）和交叉极化耦合.首先对E面单极化天线阵列进行研究，将天线的辐射臂垂直弯曲一定长度，可以引入一个自解耦零点；接着在2个天线之间引入一根垂直金属枝节，可以调节该自解耦零点的位置.在2个共线水平排布的十字型偶极子天线之间，水平辐射臂末端之间的距离较近，因此E耦合对端口隔离影响较大.当采用弯折辐射臂并引入垂直金属枝节的方法后，可以同时改善2个天线之间的45°端口隔离度和-45°端口隔离度.为了抑制45°端口与-45°端口之间的交叉极化耦合，引入一个额外的U型金属带.通过弯折辐射臂，垂直金属枝节和U型金属带的结合，2个十字型偶极子天线之间的隔离度可以从16 dB提高到25 dB以上.此外，由于在阵列上方无需加载具有较大尺寸和厚度的超材料、介质层、多层超表面等寄生结构，天线阵列的总体剖面和体积没有显著增加.

Abstract

In this paper

a decoupling method for a ±45°-polarized crisscross-shaped dipole antenna array is studied based on a collinear antenna array with a standing wave ratio of less than 1.5 in the bandwidth range of 1.7 GHz to 2.3 GHz. The mutual coupling between two ±45°-polarized collinear crisscross-shaped dipole antennas can be decomposed into three coupling types: E-plane co-polarized coupling (E coupling)

H-plane co-polarized coupling (H coupling) and cross-polarized coupling. Firstly

the E-plane single-polarized antenna array is studied

and a self-decoupling zero can be introduced by bending the antenna’s radiating arm vertically to a certain length. A vertical metal branch is then introduced between the two antennas to adjust the position of the self-decoupling zero. As the distance between the ends of the horizontal radiating arms is relatively close between two collinear horizontally arranged crisscross-shaped dipole antennas

the E coupling has great influence on the port isolation. The 45° port isolation and -45° port isolation between the two antennas can be improved simultaneously by bending the radiating arm and introducing vertical metal branch. To suppress the cross-polarized coupling between the 45° port and the -45° port

an additional U-shaped metal strip is introduced. By bending the radiation arms

combining the vertical metal branches and U-shaped metal bands

the isolation between the two crisscross-shaped dipole antennas can be increased from 16 dB to more than 24 dB. In addition

since parasitic structures such as metamaterials

dielectric layers

and multi-layer metasurfaces with large sizes and thicknesses do not need to be loaded above the array

the overall profile and volume of the antenna array do not increase significantly.

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references

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