Design and analysis of a broadband quasi-optical mode converter with a Denisov launcher

A terahertz quasi-optical mode converter with wide bandwidth was studied and designed.The quasi-optical mode converter used Denisov launcher,which had high efficiency,and worked in TE6,2 mode.It was used to realize mode conversion in gyrotron.As the parameters of Denisov launcher were the main factors affecting the broadband performance of quasi-optical mode converter,the optimal design of the radiator parameters could increase the bandwidth of the mode converter.Using the self-developed quasi-optical simulation program for simulation,the bandwidth of the mode converter can reach 2 GHz(center frequency 94 GHz).