Ka波段宽带圆极化微带天线单元及阵列设计

The Design of a Ka-band Broadband Circularly Polarized Microstrip Antenna and Array

设计了一种基于矩形缝隙耦合的Ka波段圆极化微带天线单元,分析了各参数对轴比特性的影响;为改善天线的轴比带宽和圆极化纯度,采用顺序旋转馈电技术,设计了4×4宽带圆极化微带天线阵列。仿真结果表明,该天线阵列具有良好的宽带特性,其阻抗带宽(S11<-10dB)达25%(31.4～40.2GHz),轴比带宽(AR<3dB)达17%(31.8～37.8GHz)。

A novel Ka-band broadband circularly polarized microstrip patch antenna fed by rectangular aperture coupling was proposed Firstly,the effect of key parameters on axial ratio（AR） was analyzed.In order to improve AR bandwidth and impedance bandwidth,a 4×4 broadband circularly polarized microstrip antenna array using sequentially rotated technique was designed.The simulation result shows that the impedance bandwidth（S11-10dB） of the antenna array is 25%（31.4-40.2GHz）,the AR bandwidth（AR3） is 17%（31.8-37.8GHz）.