Study for 850 GHz sheet beam staggered double-vane traveling wave tube considering the metal loss

An 850 GHz staggered double-vane traveling wave tube (TWT) is designed in this paper. The high- frequency characteristics and transmission characteristics of the circuit are calculated and the results indicate that the reflection coefficient is below -20 dB in the frequency range from 770 GHz to 860 GHz, which including the attenuator and ridge-loaded waveguide input/output coupler. The particle-in-cell simulation is also calculated and the results show that the tube can get over 50m W output power among a wide bandwidth with an operating voltage of 28.1 kV, input power of 2mW and beam current of 20 mA.