95GHz TE03模回旋管内置渐变波导设计

摘要

The design method of high-order tapered waveguides is presented according to the mode coupling theory, and the built-in, TE03 mode, modified Dolph-Chebychev tapered waveguide of 95 GHz gyrotron is studied. Reliable optimal geometric parameters are obtained with a self-developed mathematical programme. The tapered waveguide of 95 GHz gyrotron designed is compact. Its parasitic-mode-suppression is 30 dB, which is verified by electromagnetic field simulation and meeting the design requirement. The burned pattern measured at output of the waveguide indicates good expected inner radius change of the gyrotron. The results show that the method can efficiently guide the design of high-order overmode tapered waveguide.%在耦合波理论的基础上,结合波导渐变曲线给出了普适高阶渐变波导设计方法,研究了95 GHz回旋管内置TE03模式改进Dolph-Chebychev渐变波导.采用编制的数值计算程序进行优化,得到了可靠的最优几何参量,设计出了紧凑的95 GHz渐变波导.经全电磁场仿真验证,该内置渐变输出结构对杂模的抑制达30 dB,满足设计要求.回旋管的热测实验中测出的模式样图表明,所设计的内置渐变波导有效地实现了回旋管内径变化.该方法可以高效地指导高阶过模圆波导渐变结构的设计.