基于十字形缝隙耦合的宽带圆极化微带天线设计

摘要

In order to improve the performance of the bandwidth,a method to design a wideband circularly polarized mi-crostrip antenna is presented,which uses three Wilkinson power dividers as the feed network,and a crossed slot as the feeding way. The basic techniques of modeling this antenna are discussed and it is designed and verified by HFSS. A prototype is fabricated according to the design and measured by a professional research institute. The experiment results show that the impedance band-width achieves 40.38% and the 3 dB axial-ratio bandwidth is about 20.7%,the center frequency is 2.6 GHz,the measured results fit well with the simulated results. A new method of engineering design for low back lobe and wideband circular polarized microstrip antenna is provided.%为了改善微带天线的带宽性能，提出了一种采用十字形缝隙作为馈电方式，利用三个Wilkinson功分器组成馈电网络的宽带圆极化微带天线的设计方法。讨论了构建这种微带天线的基本技术，借助HFSS仿真软件进行设计和验证。依据设计结果委托专业研究所制作了实物天线，测试结果表明，该天线的阻抗带宽和3 dB轴比带宽分别达到40.38%和20.7%，中心频率为2.6 GHz，测量结果与仿真结果吻合良好，为低后瓣和宽带圆极化微带天线设计提供了一种新的工程设计方法。