T-shape Vane Slow-wave Structure for 220 GHz Sheet Beam Traveling-wave Tubes

In this paper, a T-shape vane slow-wave structure (SWS) for 220 GHz sheet beam traveling-wave tube (TWT) is proposed. The high frequency characteristics and transmission characteristics of T-shape vane SWS are analyzed by using eigenmode solver of HFSS and the frequency domain solver in CST 2016 Microwave Studio. The results indicate that the interaction impedance of T-shape vane slow-wave SWS has improved about 5% than rectangular vane’s at 220 GHz, and the reflection coefficient S
11
is below -15 dB and the transmission coefficient S
21
is above -5 dB in the frequency range from 213 GHz to 230 GHz. The T-shape vane SWS has laid a good foundation of physical experiment about 220 GHz sheet beam TWT in the future.