基于BΦifot结构的双脊波导超宽带正交模耦合器设计  

A Design of a Double-ridged Ultra Wideband Waveguide Ortho-mode Transducer Based on BΦifot

作　　者：陈卯蒸[1,2] 宁云炜[1,2] 马军[1,2] 曹亮[1,2] 

机构地区：[1]中国科学院新疆天文台,新疆乌鲁木齐830011 [2]中国科学院射电天文重点实验室,江苏南京210008

出　　处：《无线电工程》2016年第8期47-50,共4页Radio Engineering

基　　金：国家重点基础研究发展计划基金资助项目(2015CB857100);国家自然科学基金资助项目(U1431230);"西部之光"后续支持项目(2015-HXZC-01)

摘　　要：射电天文望远镜的发展对天线馈源的宽带性提出了更高的要求,作为实现双极化天线馈源系统的关键器件,正交模耦合器的宽带性能将直接影响宽带天线的性能。分析了双脊波导厚度对于水平/垂直极化波的影响,使用电磁仿真软件HFSS对水平/垂直极化波模式进行分析,对7 mm波段（30~50 GHz）的正交模耦合器进行了设计与优化,在50%相对带宽内,回波损耗优于-21 d B,正交隔离度优于-50 d B,为进一步开展毫米波宽带OMT的研究提供理论设计基础。The development of radio Astronomy telescope requires antenna feed with wider bandwidth. As a key device to realize dual polarized antenna feed system,the performance of ortho-mode transducer on bandwidth will directly affect that of the broadband antenna. The article analyzes the effect of double-ridged waveguide thickness on the horizontally / vertically polarized wave,analyzes horizontally / vertically-polarized wave mode with electromagnetic simulation software HFSS,and designs and optimizes the ortho-mode transducer for the 7 mm band（ 30 ~ 50 GHz）. Within 50% relative bandwidth,return loss is better than- 21 d B,orthogonal isolation is better than- 50 d B,which provides theoretical design foundation for the research on millimeter wave broadband OMT.

关 键 词：正交模耦合器 超宽带 BΦifot结构 双脊波导 

分 类 号：TN823.28[电子电信—信息与通信工程]