Overmoded Curved Circular Waveguide Mode Converters

High-power millimeter-wave technology have great application in communication, radar and military electronic equipment, etc., is currently a hot research at home and abroad. High-power millimeter-wave transmission and mode converter is one of the key technologies.Overmoded curved circular waveguide mode converter for high-power millimeter-wave gyrotron tube output is expected to achieve the broadband high-power millimeter-wave low-loss variable direction of transmission, has important significance in high-power millimeter-wave high efficiency of transmission. Supported by the High-power Microwave vacuum devices National Defense Science and Technology key Laboratory of UESTC, the high-power millimeter-wave transmission and mode conversion par of gyrotron tube and other high-power millimeter-wave sources are studide in this paper with theoretical and numerical simulation analysis in depth.This works lay a good foundation in future-oriented teaching and research work. The main works of the paper are listed as following:1. The application of the overmoded curved circular waveguide mode converter in high-power millimeter-wave transmission system and the transform process of gyrotron tube have been analyed.2. The issue of mode coupling in the overmoded curved circular waveguide is studied,and the program of calculation optimizer based on coupled-wave equations and the corresponding coupling coefficient over the preparation of curved circular waveguide is done.3. For the output of gyrotron tube sequence, and based on the actual project needs, TE01-mode, TE11 mode 90°bent and the TE01-TE11 mode converter have been calculated and analyzed, have been suitable for high-power millimeter-wave transmission model and parameters and the corresponding changes in the relationship between parameters.4. For pairs of curved TM01-TE11 mode converter and the TM01 mode 90°bent carried out numerical simulation.