一种新型宽带圆极化天线的分析与设计

摘要

A novel broadband circularly polarized (CP) antenna with stair-shaped structure in the two opposite corners in the ground plane is proposed in this paper. The CP property could be improved by adjusting the dimensions of the stair-shaped structure. The 3dB axial ratio (AR) could be further optimized by trimming the two inner corners in the ground aperture. The feeding part is designed as a L-shaped patch which shows significant influence on the property of impedance match of the antenna. The simulated and measured results with S11<-10dB and 3dB AR show the proposed antenna has a synthetic bandwidth about 71.4%和74.2%desperately. The key parts are analyzed to study the effect on the antenna. And simulated and measured return loss, AR and gain are also presented finally.%本文设计了一种新型的在地板网孔对角开阶梯型结构的宽带圆极化天线，通过调节阶梯型结构的尺寸，可以改善天线的圆极化性能。在地板网孔的两个内角进行切角，可以进一步优化天线的3 dB轴比带宽。馈电结构采用了L型贴片结构，可以显著提高天线的阻抗匹配性能。仿真和测量的-10 dB回波损耗和3 dB轴比的综合带宽分别为71.4%和74.2%。最后就天线设计的几个关键结构对天线性能的影响进行了分析，并给出了天线回波损耗，轴比和增益的仿真和测试结果。