Transmission Characteristics of 220 GHz T-shape Staggered Double-Vane Slow Wave Structure

In this paper, a T-shape staggered double-vane slow wave structure (SDVSWS) for 220 GHz sheet beam travelling-wave tube (TWT) is studied. The simulated transmission characteristic results of the whole SDVSWS with the input and output couplers are investigated by using the CST. The transmission coefficient S21 is greater than -7.5 dB and the reflection coefficient S
_l1
is below -20 dB from 213 GHz to 230 GHz, and the attenuation constant of the whole SDVSWS is below 1.6 dB/cm in the same frequency range. The designed SDVSWS has a good performance for 220 GHz sheet beam TWT, which is of great importance for applications such as radar, communications, security, and imaging.