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设计了工作于高阶横磁TM310模式圆柱同轴谐振腔。模拟计算了六个漂移管间隙中心轴向谐振电场极大值位置处的特性阻抗。对于谐振腔加载空矩形波导和加载电感膜片滤波器矩形波导两种速调管输出回路,由微波电路理论和高频电磁场软件分别模拟计算了漂移管间隙中心的平均间隙阻抗和输出带宽。两种情形间隙阻抗的最大值分别为48.757 kΩ和14.328 kΩ;间隙阻抗的3 dB带宽分别约为1.1MHz和2.8MHz。研究表明,单间隙圆柱同轴输出腔高阶横磁TM310模式结构适用于高频、窄带和高功率多注速调管输出回路。
Designed to work in high-order transverse magnetic TM310 mode coaxial cavity. The characteristic impedance at the maximum position of the axial resonant electric field of the center of the drift tube gap is simulated. For the two kinds of klystron output circuits with empty rectangular waveguide loaded rectangular waveguide and rectangular waveguide loaded with inductive membrane filter, the average gap impedance and the output bandwidth of the center of the drift tube are simulated respectively by microwave circuit theory and high frequency electromagnetic field software. The maximum gap impedance for both cases is 48.757 kΩ and 14.328 kΩ, respectively; the 3 dB bandwidth of the gap impedance is about 1.1 MHz and 2.8 MHz, respectively. The research shows that the high-order transverse magnetic TM310 mode structure of single-gap cylindrical coaxial output cavity is suitable for high-frequency, narrow-band and high-power multi-injection klystron output circuits.