一种应用于相控阵的圆极化宽带宽角天线

A Wideband Wide Scanning Circularly Polarized Antenna for Phased Array Systems

针对目前圆极化相控阵天线带宽不足、扫描角度不够大等问题,设计了一种圆极化正交四叶草天线,并做试验研究了该天线在相控阵系统中的应用情况。该天线图案涂覆在印制板正、反两面,采用同轴电缆进行馈电,结构简单易于实现,在阵列中通过单元间隔离柱实现了大角度扫描匹配以及宽带轴比特性。文中给出了该圆极化天线的仿真设计结果、天线阵列样机实测结果及应用举例。根据仿真及实测结果的互相验证,可以看出该圆极化天线在空域内扫描驻波良好,具有超过35%的阻抗带宽及轴比带宽,同时该天线结构简单、重量轻,适用于模块化相控阵雷达系统。

Aiming at the current problems of insufficient bandwidth and scanning angles of circularly polarized phased array antennas,a circularly polarized quadrature four-leaf clover antenna is designed,and the application of the antenna in the phased array system is experimentally studied.The antenna pattern is coated on the front and back sides of the PCB,the coaxial cable is used for feeding,and the structure is simple and easy to implement,in the array,the wide-angle scanning and broadband axial ratio characteristics are realized through the isolation column between the cells.The simulation design results of the circular polarization antenna,the actual measurement results of the antenna array and application examples are given in the article.The mutual verification between antenna simulation and actual measurement results shows that the circularly polarized antenna has good VSWR in all scanning region,the impedance bandwidth and axial ratio bandwidth both are more than 35%,besides,the antenna has the advantages of simple structure and light weight,and is suitable for use in modularized phased array radar systems.