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损耗是慢波结构的重要参量之一。采用理论与仿真的方法分析了在亚毫米波段(220GHz)折叠波导慢波结构的导体损耗。在理论模型计算了弯曲波导段的衰减系数,并考虑了波导内表面粗糙度对电导率的影响,从而使模型更接近实际情况。计算结果表明,弯曲波导段的衰减常数大于直波导段,而且理论模型计算出的每周期折叠波导电路的损耗与高频仿真软件HFSS的结果吻合较好,说明理论模型有较高的精确度。在此基础上,分析了慢波结构参数变化对损耗的影响。
Loss is one of the important parameters of the structure of the slow wave. The theoretical and simulation methods are used to analyze the conductor loss of the folded waveguide slow-wave structure in sub-millimeter band (220GHz). In the theoretical model, the attenuation coefficient of the curved waveguide section was calculated, and the influence of the inner surface roughness of the waveguide on the conductivity was considered, so that the model was closer to the actual situation. The calculated results show that the attenuation constant of the bent waveguide section is larger than that of the straight waveguide section, and the loss per cycle of the folded waveguide calculated by the theoretical model agrees well with that of the high-frequency simulation software HFSS, which shows that the theoretical model has higher accuracy. Based on this, the influence of the change of the structure parameters of the slow wave on the loss is analyzed.