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利用场匹配理论和传输级联矩阵建立多层介质窗的分析方法,对回旋行波管输入窗进行解析分析。在理论分析的基础上,通过数值计算得到回旋行波管宽带输入窗的初步结构和尺寸,然后再利用三维高频分析软件HFSS进行仿真和验证。通过优化设计,在W波段获得了传输系数大于-0.04 dB,反射系数小于-20 dB的带宽大于8 GHz的宽带输入窗。冷测实验表明冷测结果与设计参数较为吻合。
Based on the field matching theory and the transmission cascade matrix, a multi-layer dielectric window analysis method is established to analyze the gyro-traveling wave window input window. Based on the theoretical analysis, the initial structure and size of broadband input window of gyrotron TWT are obtained by numerical calculation, and then the simulation and verification are conducted by using the three-dimensional high-frequency analysis software HFSS. Through the optimized design, a broadband input window with a bandwidth greater than 8 GHz with a transmission coefficient greater than -0.04 dB and a reflection coefficient less than -20 dB is obtained in the W band. Cold test shows that the cold test results are in good agreement with the design parameters.