Design of a High Efficiency Miniaturized W-band Pulsed Traveling-Wave Tube

In this paper, a high efficiency miniaturized pulsed traveling-wave tube (TWT) at W-band is designed by using the folded waveguide as the slow-wave structure. The output power, gain, and electronic efficiency are guaranteed by using velocity-step technology. Then a three-stage depressed collector is designed to achieve efficient recovery of the electron beam after the beam wave interaction. In the simulation design, the output power is more than 133W with gain of up to 34.2dB at 90GHz to 100GHz. Meanwhile, the design scheme achieves electronic efficiency of up to 8.7
^%
and collector efficiency of up to 91.86% over the operating bandwidth, which means that the total efficiency is expected to reach 35.8%.