倾斜波束圆极化天线的CSRR-FS结构设计研究

倾斜波束圆极化天线的CSRR-FS结构设计研究

内容简介：为了拓展倾斜波束圆极化天线（Circularly Polarized Antenna with Tilted Beam ，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（complementary split ring resontor ，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（voltage standing wave ra-tio ，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．

Abstract：Based on the analysis of the configuration and the character of the circularly polarized antenna with tilted beam ,a novel CSRR-FS(Complementary Split Ring Resonator with Flower-Spiral ,CSRR-FS)structure is proposed to increase the bandwidth of the antenna .This structure is designed through the flower-spiral arm and five complementary split ring resonator (CSRR )splits loaded on ground plane .The VSWR(voltage standing wave ratio)is enhanced through the flower-spiral structure .And respectively , five CSRR splits are loaded on the perfect electronic conductor ground plane to miniaturize the ground plane and decrease the cross-polarization component .The axial ratio is improved through the ground plane loaded five CSRR splits .Simulated and measured re-sults both show that the relative bandwidth of the novel antenna with the CSRR-FS structure is 24% from 5.5GHz to 7GHz in the condition of circularly polarized radiation .And while ,it is an azimuth angle of 30° tilted beam by the CSRR-FS structure .The band-width increases 1 .8 times as wide as one without the CSRR-FS structure in the same condition .The proposed structure is an effec-tively method for increasing the bandwidth of circularly polarized antenna with tilted beam .

作者：李思佳, 曹祥玉, 郑秋容, 刘涛, 陈校平,

关键词：圆极化天线, 倾斜波束, 花纹式螺旋臂结构, 互补开口谐振环,