Design Of An S-band Wave-guide Window

In the paper we describe research and development of wave-guide window in the world and reveal some key problems to be solved. The failures of the wave-guide window are analyzed. Base on the experience, window failures can be separated into three basic categories: dielectric failure, thermal failure and boundary failure. And we introduce occurrences of multipactoring and multipcatoring suppression methods in details.In the paper a new design of S-band wave-guide window with an additional inductive iris is presented, so that ceramic disks of arbitrary thickness may be used. The paper introduces how to use high frequency structure simulator (HFSS) to establish a physical model of wave-guide window and calculate the distribution, magnitude and direction of electric field inside wave-guide window. In addition, some of RF parameters of wave-guide window such as frequency, bandwidth and VSWR are also calculated. All of these provide a thoroughly theoretic basis for how to improve and manufacture the wave-guide window. Ultimately a new-type of wave-guide window for transmission peak power of 5MW, average power of 45kW is well designed. The results of the cold tests of the window are analyzed and discussed in the last part of the paper.