高阶圆波导模式圆极化器的研究

Circular polarizers for high-order waveguide modes

提出了一种基于光滑圆波导结构的高阶TEmn模圆极化器.运用耦合波理论和数值计算方法对93 GHz TE5,1模圆极化器进行了研究和设计.设计的圆极化器由过渡段和移相段组成,结构简单,易于实现.在88～98 GHz的频带内,最大轴比低于1.18.空间辐射测试结果证明了这种高阶圆极化器的性能.为高性能的低阶波导模式圆极化器的设计提供重要参考。

Based on the smooth cylindrical waveguide structure,an novel polarization converter for high-order TEmn mode is presented.Using the general coupled wave theory and numerical optimization method,a polarization converter for 94 GHz TE5,1 mode is studied.The proposed polarizer,consisting of transition section and phase shift section,features structurally simple and easy construction.From 88 GHz to 98 GHz,the maximum axial ratio of the polarizer is less than 1.18.The performance of polarizer was veritfied by comparing the ideal radiation field and the measured one.The research work provides a physics model for designing low-order waveguide mode polarizer with high conversion effciency.