THz交错波导慢波结构高频损耗研究

利用等效电导率方法对310 GHz的双栅交错波导慢波结构中电磁信号的传输损耗进行了仿真研究，比较了不同导体表面粗糙度和不同谐波造成的高频损耗的影响。仿真结果表明表面粗糙度会使传输信号严重衰减，频率相同的-1和+1次空间谐波传输损耗也有较大差异，传输-1次空间谐波时的导体单位损耗更大，且随表面粗糙度增加，损耗增加速度更快。模拟了不同的粗糙度对慢波结构增益、带宽等工作性能参数的影响，结果显示高频损耗会使增益下降、带宽降低。

Abstract

The equivalent-conductivity method is applied to the simulation work of electromagnetic transmission attenuation for 310 GHz double vane slow-wave structure. The factors which will influence the transmission attenuation，including surface roughness and harmonic mode, are studied. The result shows that roughness will result in serious electromagnetic attenuation. The -1st and the 1st harmonics at the same frequency result in different transmission attenuations; and the -1st harmonic results in greater electromagnetic attenuation which will increase faster when roughness grows up. The process of the beam-wave interaction of structure is also simulated. Especially the influence of roughness on working performance of Strategic Weapons Systems(SWS)，such as gain, bandwidth，is analyzed.The results show that roughness causes gain reduction and bandwidth decrease.

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