共面波导馈电圆极化微带天线研究

对一种结构新颖的共面波导馈电圆极化微带天线进行了研究。天线的辐射单元采用两个方形贴片,简并分离单元分别附加在两个方形贴片的不同边沿,共面波导开路终端通过耦合对两个方形贴片进行馈电。整个天线具有对称的结构,抑制了共面波导中的偶模分量,产生了两个同旋向的圆极化辐射波。分析并设计了这种天线单元,天线的实测-10 dB回波损耗带宽达到11.6%,圆极化带宽达到1.86%,在前、后两个方向上均辐射左旋圆极化(LHCP)波。理论设计结果与实测结果吻合较好。

CPW - Fed Circularly Polarized Micro-strip Antenna

A novel bi-directional micro-strip antenna fed by coplanar wave-guide(CPW) is proposed to obtain circular polarization(CP) radiation.Two square patches,fed by coupling through the CPW open stub,are selected as the radiating elements.Perturbation segments are added at different sides of the square patches.Same rotation CP radiations in two opposite directions are achieved by adding perturbation segments.The symmetrical characteristics of the antenna suppress the even mode in the CPW line.Measured results show that the proposed antenna has a-10dB return loss bandwidth of 11.6% and a CP bandwidth of 1.86%.Left-hand circular polarization(LHCP) appears on both sides of the antenna.The theoretical results accord with the measured results well.