基于阻抗超表面的高效率角锥喇叭馈源  

High efficiency pyramid horn feed based on impedance meta-surface

作　　者：何应然[1] 刘磊 杜彪[1] HE Yingran,LIU Lei,DU Biao(The 54th Research Institute of China Electronics Technology Corporation,Shijiazhuang 050081, Chin)

机构地区：[1]中国电子科技集团公司第五十四研究所,石家庄050081

出　　处：《电波科学学报》2018年第3期350-356,共7页Chinese Journal of Radio Science

基　　金：河北省应用基础研究计划重点基础研究项目(16960404D);国家自然科学基金(61701456)

摘　　要：研究了一种基于阻抗超表面的高效率角锥喇叭馈源.将阻抗超表面放置于金属角锥喇叭内壁,获得了一种性能良好的新形式高效率馈源.首先分析了超表面对表面阻抗特性的调控作用,并证明该超表面对TE波和TM波呈现不同的阻抗特性.在特定的阻抗条件下,该喇叭内壁可以支持平衡混合模式,从而获得旋转对称的辐射波束.然后设计和加工了Ku频段的超表面高效率馈源,馈源的测试方向图表明其辐射性能优良.最后将该馈源照射一款1.25m Ku频段环焦天线,测试其辐射方向图,同样显示出其优异性能.与该环焦天线原有的波纹喇叭馈源相比,超表面高效率馈源的性能与波纹喇叭馈源相当,同时在体积、重量和成本方面具有明显优势.A meta-surface based high efficiency pyramid horn feed is studied. By placing impedance meta-surfaces on the inner boundary of a metallic pyramid horn, an excellent and novel high efficiency feed is obtained. First, it is shown that the surface impedance is greatly modulated by the meta-surface, and that the meta-surface exhibits different impedance characteristics with respect to TE polarized and TM polarized waves. When a proper impedance is achieved, the inner boundary of the horn could support balanced hybrid mode, so as to reach rotationally-symmetric radiation beam. Then a Ku-band meta-surface feed is designed and fabricated, and the feed radiation pattern shows excellent performance. Finally, the feed is used to illuminate a 1.25 m Ku band ring-focused reflector antenna. The measured radiation patterns show great performances. Compared with the corrugated horn feed used in the reflector antenna, the meta-surface feed can achieve similar electrical performance. Meanwhile, the meta-surface feed shows obvious advantages in size, weight and cost.

关 键 词：高效率馈源 反射面天线 阻抗超表面 平衡混合模式 

分 类 号：TN821[电子电信—信息与通信工程] TN828