摘要
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。
Attenuation is one of the most important characteristics of the slow-wave circuit. In this paper, the analyses of the loss characteristics for the folded waveguide slow-wave circuit operating at sub-millimeter wave band are presented using both theory and simulation methods. In the analytical mode the attenuation coefficient of the bend waveguide is derived and the effect of the surface roughness on the conductivity is considered. These make the analytical model much more accurate in evaluation the circuit loss. The numerical results show that the attenuation coefficient of bend waveguide is higher than that of the straight waveguide, and the theoretical results from theory are in good agreement with that obtained from HFSS. Based on these, the effects of the variations of slow-wave circuit parameters on loss characteristics are studied.
出处
《半导体光电》
CAS
CSCD
北大核心
2010年第6期880-884,944,共6页
Semiconductor Optoelectronics
基金
国家自然科学基金项目(60532010)
关键词
损耗特性
行波管
折叠波导
慢波结构
loss characteristics
traveling-wave tubes
folded waveguide
slow-wave circuit
