A compact TE31-TE11 high power microwave mode convertor based on long coupling slot

For the development demand of the compact high power microwave systems, more compact antenna and feed line come as a solution. A noval Compact TE31-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 TE31 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.