同轴交错圆盘加载波导慢波结构高频特性的研究

Dispersion characteristics of the coaxial interlaced disk-loaded waveguide slow-wave structure

采用多导体传输线分析方法,对同轴交错圆盘加载波导慢波结构进行了理论分析,得到了这种慢波结构的色散方程;利用该色散方程,得到的色散特性与HFSS仿真软件模拟结果符合良好.分析了结构参数的变化对同轴交错圆盘加载波导慢波结构的色散特性影响.结果表明:增加内径和减小慢波结构的单位周期长度可以拓展慢波结构的带宽.对同轴圆盘加载波导和同轴交错圆盘加载波导两种慢波结构的色散特性进行了比较,结果表明:采用圆盘交错加载方式可以减弱色散,拓展带宽.研究结果对同轴交错圆盘加载波导在毫米波行波管中的应用具有指导意义.

The dispersion equation of the coaxial interlaced disk-loaded waveguide slow-wave structure is derived by the multi-conductor transmission line method. The simulation results by HFSS are in good agreement with the calculation results obtained from the dispersion equation. Influences of structure parameters on dispersion characteristics are discussed. It can be concluded that with the increase of inner conductor and the decrease of the period length, the bandwidth of the slow-wave structure becomes greater. The dispersion characteristics of the coaxial interlaced disk-loaded waveguide and those of the coaxial disk-loaded waveguide are compared. The results show that the coaxial interlaced disk-loaded structure can obtain a wide bandwidth and weak dispersion. This study will be a guide to the research of the coaxial interlaced disk-loaded waveguide slow wave structure used in the traveling-wave tube.