多注太赫兹折叠波导行波管的设计与模拟

Design and simulation of multi-beam terahertz folded waveguide TWT

摘要:

为解决太赫兹(THz)行波管工作电流过小、输出功率低等问题，提出了基模多注工作模式的折叠波导行波管(TWT)。首先，获得了基模多注折叠波导色散特性；然后，对基模多注折叠波导的传输特性进行了模拟计算；最后，完成了0.14 THz基模多注折叠波导行波管的注波互作用特性分析。电子注参数为12 mA，15.75 kV时，获得的3 dB带宽为25 GHz(128 GHz~153 GHz)，最大增益为33.61 dB，最大峰值功率为23 W；电子注参数为30 mA，15.75 kV时，在0.14 THz处获得了38 dB增益，最大脉冲输出功率为63.1 W。该方法能够有效增大THz行波管的工作电流，提高互作用增益及效率、3 dB带宽、输出功率；在增益相同时，基模多注行波管可以做得更短、更紧凑。

Abstract:

To improve the current and output power of terahertz Traveling Wave Tube(TWT), a Fundamental Mode Multi-Beam Folded Waveguide(FMMBFW) TWT scheme is proposed. Firstly, the high frequency characteristic is gained and compared with numerical simulation result. Secondly, the transmission characteristic of 60 periods FMMBFW is analyzed. Lastly, the beam-wave interaction characteristic of 0.14 THz FMMBFW TWT is completed by numerical simulation and theoretical calculation. When the DC current is 12 mA and the voltage is 15.75 kV, the 3 dB band of 0.14 THz FMMBFW TWT is 25 GHz(128 GHz-153 GHz), the maximum gain is 33.61 dB and the maximum output power is 23 W. When the DC current is 30 mA and the voltage is 15.75 kV, the maximum gain is 38 dB and the maximum pulse output power is 63.1 W at 0.14 THz. This method can effectively increase the current of FMMBFW TWT, and the interaction gain, efficiency, 3 dB band, output power can be improved. When the gain is the same, FMMBFW TWT can be fabricated more short and compact.