过模弯曲圆波导模式耦合设计

DESIGN MODE COUPLING FOR OVERMODED BENT CIRCULAR WAVEGUIDE

基于耦合波理论,波导轴线采用常规圆弧弯曲和改进的正弦弯曲结构,对TE01—TM11模式变换器进行全面优化分析,计算中考虑了多模、反向波、金属壁所带来的欧姆损耗以及相位重匹配等因素.以正弦弯曲设计的Ka波段TE01—TM11模式变换器的转换效率达到99%,带宽超过32%,并得出常弯曲结构中波导半径、波导曲率、变换器长度和转换效率之间的关系.

Based on the mode coupling theory, the design of TE01-TM11 mode converter geometry configuration with traditional waveguide axis constant curvature and improved waveguide axis sinusoidal curvature Was presented for more acceptable geometry parameters. More considerations were given to the influences of muhimode factor, backward wave, ohmic losses carried from metal wall and phase rematch. The conversion efficiency of Ka waveband with waveguide axis sinusoidal curvature is about 99% with bandwidth of 32%. At the same time, the relation among the radius and curvature of circular waveguides, the length of converter and converting efficiency is obtained.