一种透射型线-圆极化转换超表面设计  

Design of a transparent linear-to-circular polarization conversion metasurface

作　　者：刘双兵[1] LIU Shuangbing(School of Mechanical and Electric Engineering, Chaohu College, Hefei 238000, China)

机构地区：[1]巢湖学院机械与电子工程学院,安徽合肥238000

出　　处：《电子元件与材料》2017年第9期18-21,共4页Electronic Components And Materials

基　　金：安徽省高校优秀青年人才支持计划重点项目(No.gxyq ZD2016291)

摘　　要：提出了一种单对角线开缝的方形单元构成的透射型极化旋转超表面,并将其应用于宽带圆极化微带缝隙天线的设计中。采用等效电路法分析了超表面实现线-圆极化转换的工作机制,并对天线圆极化带宽的影响因素进行了参数扫描。仿真结果表明:加载超表面使线极化微带缝隙天线产生了圆极化辐射,同时扩展了天线的阻抗带宽。天线相对阻抗带宽达到了33.2%,3 d B轴比带宽达到了19.5%,在阻抗带宽内天线增益均高于6.8 d Bi,表明新型超表面结构具有良好的线-圆极化转换特性。A transparent polarization conversion metasurface was presented for designing of wide band circular polarized microstrip slot antenna.It was composed of square units with a single diagonal slot.The metasurface’s working mechanism of converting linear to circular polarization was analyzed by equivalent circuits,and the parameters of the metasurface were swept according to their influence on the3dB axial ratio bandwidth.Simulated results show that the linearly polarized microstrip slot antenna can radiate circularly polarized wave and its impedance bandwidth is broaden by loading the metasurface.The relative impedance bandwidth and3dB axial ratio bandwidth can reach33.2%and19.5%,respectively.The antenna gains are higher than6.8dBi within the impedance bandwidth.It is indicated that the new metasurface has good linear-to-circular polarization conversion characteristics.

关 键 词：极化转换 超表面 宽带 圆极化 微带缝隙天线 轴比 

分 类 号：TB34[一般工业技术—材料科学与工程] TN821.1[电子电信—信息与通信工程]