在研究0.14 THz折叠波导行波管中,提出一种三段相速跳变的设计,使得电子能够在输出段与行波场发生速度再同步,从而提高了电子工作效率.根据色散公式,找到一种影响相速变化的结构因素.通过优化设计进行大信号程序计算,在电压14.95 kV、工作电流30 mA时,与未采用相速变化的结构相比,140 GHz时功率提高了0.84 W,效率提高了9.13％;在142 GHz时功率提高了0.88 W,效率提高了10.4％;-1 dB带宽由原来的5 GHz提高到7 GHz,扩展了行波管的带宽,提高了电子与波的互作用效率.%The design of three sections phase velocity taper is put forward in 0.14 THz folded waveguide Traveling Wave Tubes(TWT) research. It can maintain beam-traveling wave velocity synchronization again in output section of interaction circuit and improve the beam operating efficiency. A structure parameter impacting on phase velocity change is found and optimized by slow wave structure dispersion equation. After optimizing design, a large signal program calculation is performed under operating voltage 14.95 kV and current 30 mA. Compared with the structure without phase velocity taper, the efficiency is improved by 9.13％ in 140 GHz, and the output power in improved by 0.84 W. The efficiency is improved by 10.4％ in 142 GHz, and the output power is improved by 0.88 W. -1 dB bandwidth is improved to 7 GHz from 5 GHz. The design improves the bandwidth and beam-traveling wave work efficiency in D band folded waveguide traveling wave tubes.
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