Chodorow型耦合腔慢波结构色散特性和耦合阻抗理论分析

Analysis of the dispersion and interaction impedance for a coupled cavity slow wave structure with double in-line slots in TWT

本文建立了Chodorow型耦合腔慢波结构的解析模型,利用并矢格林函数结合矩量法求解了场匹配方程,给出了色散方程和耦合阻抗的计算式,并数值计算出一个X波段Chodorow型慢波结构的高频特性.结果表明,本文方法的色散特性以及耦合阻抗与仿真软件HFSS计算的结果有很好的一致性,且计算效率更高,同时精度远高于等效电路法,对工程设计有好的参考价值.

An analytical model is presented in this paper for a coupled cavity slow-wave structure （CCSWS） with double in-line slots, also known as the ＂Chodorow＂ structure. Under matching boundary conditions in conjunction with Green＇s function techniques and moment method （MOM）, the formulae for discussing the high frequency characteristics of the SWS, including dispersion and interaction impedance, are given. The frequency characteristics for an X band Chodorow structure are calculated using these formulae, Ansoft HFSS code and equivalent circuit model. Results show that the dispersion and interaction impedance obtained with the formulae are in good agreement with those calculated by Ansoft HFSS code, while its calculation rate is more rapid than that with the code, and its calculation precision is higher than that with equivalent circuit method, which is helpful for the engineering design.