Staggered Double-vane Slow-wave Structure with Attenuators for a 220 GHz Sheet Beam Traveling-wave Tube

In this paper, a staggered double-vane slow-wave structure (SWS) with attenuators for a 220 GHz sheet beam traveling-wave tube (TWT) is studied. The TWT consists of a staggered double-vane SWS with 75 periods, two identical L- shaped couplers, and a pair of transition sections with 5 periods. The simulation results show that S
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is below –39.9 dB in the frequency range of 201–252 GHz, and the voltage standing wave ratio is less than 1.42. Besides, the simulation results of beam-wave interaction show that this staggered double-vane SWS with attenuators is suitable for employment in the 220 GHz sheet beam TWT.