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由于折叠波导具有准二维结构、功率容量大、易集成等特点,非常适合在THz频段推广应用,文中对0.85THz折叠波导行波管(FW-TWT)的色散和耦合阻抗特性进行了模拟计算与优化,利用等效电路理论、简化理论与CST仿真计算的方法。根据折叠波导直波导高度需大于注通道的特点,电子注的直流加速电压必须小于某一值;根据MEMS加工工艺的允许误差范围,对折叠波导结构各部分的参数进行优化,使该结构的色散较平坦与耦合阻抗较大。计算结果表明:电子注的直流加速电压不超过26 kV;注通道填充比为0.1时,带宽约400 GHz、相速变化率小于1%时带宽约275 GHz(825~1 100 GHz)。该套方法对THz折叠波导行波管的设计具有重要意义。
Due to its quasi-two-dimensional structure, large power capacity and easy integration, the folded waveguide is very suitable for popularization and application in the THz band. The dispersion and coupling impedance characteristics of a 0.85THz folded waveguide TWT (FW-TWT) are simulated And optimization, the use of equivalent circuit theory, simplified theory and CST simulation calculation method. According to the characteristic that the straight waveguide height of the folded waveguide is larger than that of the injection channel, the DC acceleration voltage of the electron injection must be less than a certain value. The parameters of the folded waveguide structure are optimized according to the allowable error range of the MEMS processing technology, Relatively flat and coupled impedance larger. The calculated results show that the DC injection voltage of electron injection does not exceed 26 kV; bandwidth of about 400 GHz when the channel filling ratio is 0.1; and bandwidth of about 275 GHz (825 ~ 1 100 GHz) when the phase velocity is less than 1%. This set of methods is of great significance for the design of THz folded waveguide traveling wave tube.