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电子学报  2014 

倾斜波束圆极化天线的CSRR-FS结构设计研究

DOI: 10.3969/j.issn.0372-2112.2014.10.040, PP. 2123-2128

Keywords: 圆极化天线,倾斜波束,花纹式螺旋臂结构,互补开口谐振环

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Abstract:

为了拓展倾斜波束圆极化天线(CircularlyPolarizedAntennawithTiltedBeam,CPA-TB)的带宽,在分析了该天线结构及其特征的基础上,提出了一种花纹式螺旋臂(Flower-Spiral,FS)协同互补开口谐振环(complementarysplitringresontor,CSRR)的CSRR-FS结构.该结构通过FS增加了天线表面电流路径,实现了天线驻波比(voltagestandingwaveratio,VSWR)的拓展;利用CSRR改变了低频点反射板的电流分布,实现反射板小型化的同时,减小了天线的交叉极化分量,增强了天线的辐射性能,拓展了天线的轴比带宽.仿真和实测结果表明:与普通的平面反射板相比,在保证圆极化、波束倾角30°的条件下,基于CSRR-FS结构的CPA-TB相对带宽为24%(5.5-7GHz),天线工作带宽拓展了1.8倍.CSRR-FS结构的提出为CPA-TB带宽的拓展提供了新的途径.

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