基于长缝耦合的紧凑型TE31-TE11高功率微波模式变换器

摘要

提出了一种新型的TE31-TE11模式的紧凑型高功率微波模式转换器结构,在对比分析TE31和TE11两个模式的场分布特征相互关系基础上,通过在输入和输出圆波导组成的内外套筒结构和适当布置镜像对称分布的轴向耦合长缝,实现在小于1.2个波长的轴向长度内将相对论磁控管产生的L波段TE31模式高功率微波转换为可定向辐射的圆波导TE11模式,采用全电磁波仿真结合Taguchi方法优化了模式转换器的几何参数,在工作频点获得的仿真模式转换效率为99％,效率高于95％的带宽达到10％,并对其工作于真空环境下的瞬态功率容量进行了仿真分析,理论的瞬态功率容量可达到3.4 GW.%For the development demand of the compact high power microwave systems,more compact antenna and feed line come as a solution.A noval compact TE3t-TE11 high power microwave mode convertor was proposed based on the electro-magnetic field distribution characters of the two modes,and a novel sleeve structure with eight mirror imaged long-axis slots was employed to convert TEa1 mode generated from relativity magnetron to TE11 mode suitable for directed radiation.By optimization of the geometric parameters of the convertor based on full wave simulation,the conversion efficiency is as high as 99 ％ at the work frequency,and its percent bandwidth is 11％ for conversion efficiency higher than 95％.Simulation of the convertor in vacuum shows that its theoretical transient power capacity could be 3.4 GW.