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对一种全金属慢波系统—–正弦波导的高频特性进行了理论分析.在用一系列相连矩形阶梯逼近余弦槽的基础上,对慢波结构进行了合理的区域划分,获得了各区域的场表达式.考虑槽区的高次驻波项,采用场匹配和导纳匹配相结合的方法,导出色散方程和耦合阻抗表达式.以应用于220 GHz行波管的正弦波导为例进行高频特性的数值求解,理论计算值与全三维电磁软件CST-MWS的仿真值符合良好.在此基础上,详细分析了尺寸参数变化对正弦波导高频特性的影响.
A kind of all-metal slow-wave system, the high-frequency characteristic of sine wave guide, is theoretically analyzed.Based on a series of connected rectangular steps to approximate the cosine trough, the reasonable structure of the slow wave structure is divided, Considering the high-order standing wave term in the tank region, the dispersion equation and the coupled-impedance expression are derived by a combination of field matching and admittance matching. Taking the sine wave waveguide applied to a 220 GHz traveling-wave tube as an example The numerical calculation of the high-frequency characteristics is in good agreement with the simulation results of the CST-MWS, and the influence of the dimensional parameters on the high frequency characteristics of the sine waveguides is analyzed in detail.