THz返波管圆波导梳状慢波结构的研究
doi: 10.3724/SP.J.1146.2007.00797
Investigation of Circular Comb Slow-Wave Structure of THz Backward-Wave Oscillators
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摘要: 该文利用三维电磁仿真软件模拟计算了THz圆波导梳状慢波结构的负1次返波的色散和耦合阻抗。结果证实：在430-570GHz频带内，慢波结构内半径为0.175mm，约为中心频率波长的0.292倍；在760-940GHz的频带内，慢波结构内半径为0.1mm，是中心频率处波长的0.392倍。该结构较大的径向尺寸有利于提高电子注通过率。这种结构负1次返波的耦合阻抗较小，基本上小于1 ，很好解释了现有THz返波管的电子效率小于0.01%的事实。Abstract: 3-D electromagnetic simulation software is used to calculate the dispersion and interaction impedance of circular comb Slow-Wave Structure (SWS) which works for Terahertz (THz) Backward-wave Oscillators (BWO). The results show that the inner radius of SWS is 0.175mm in the band of 430-570GHz, and the inner radius of SWS is 0.1mm in the band of 760-940GHz. The large radius of SWS is a great help for improving beam transmission. The interaction impedance of fundamental backward wave of the SWS is smaller than 1 is a good explain to the truth that the electronic efficiency of THz BWO is smaller than 0.01%.
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