一种宽频带圆极化方形槽天线设计

Design and Research of a Broadband Circularly Polarized Antenna

本文研究设计了一种宽频带圆极化方形槽天线,采用一种锥形渐变的L形微带线给天线馈电来实现更好的阻抗匹配,加载一些能够产生微扰效应的枝节和缝隙槽来获得优良的圆极化性能。通过将这些枝节和缝隙槽加载到方形槽地板中,该天线的2dB轴比带宽和回波损耗带宽能够得到明显的展宽。仿真和测试结果表明:天线的2dB轴比带宽约为56%,回波损耗带宽达到了87%。测试结果和仿真结果吻合良好。

A broadband circularly polarized(CP) antenna is proposed in this letter. An L-shaped microstrip line with tapered section is used to feed the antenna. Stubs and slots are utilized as perturbations for the desirable antenna performance. By loading slots and stubs in the square-slot ground plane, the 2-dB axial ratio(AR) bandwidth and 10-dB return loss bandwidth for the presented antenna can be markedly improved. The antenna is successfully designed and fabricated. Measured results show that its 2-dB AR bandwidth is 4.33 GHz(56% from 5.52 GHz to 9.85 GHz) and its 10-dB return loss bandwidth is about 7.9 GHz(87% from 5.1 GHz to 13.0 GHz). Good agreement between the measured and simulated results is obtained.