Design of a quasi-optical mode converter for a 170GHz gyrotron

1.Key Laboratory of High Power Microwave Sources and Technologies, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing,101400, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Hisense Mobile Communication Technology Co., Ltd. Qingdao, 266555, China

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Supported by the National Natural Science Foundation of China (61571418,61531002)

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    A high efficiency Denisov-type quasi-optical mode converter for a 170GHz TE31,8 mode gyrotron is presented. The mode converter comprises a dimpled-wall launcher and a mirror system. Based on the coupled mode theory, the advanced launcher having two stages of perturbations is investigated. A mirror system of the converter is optimized and designed by using the vector diffraction theory. Simulation results show that the good Gaussian mode is converted from the circular waveguide TE31,8 mode and the mode conversion efficiency of a quasi-optical mode conveter is 93.7%.

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  • Received:April 07,2021
  • Revised:October 25,2021
  • Adopted:May 24,2021
  • Online: October 21,2021
  • Published: