Abstract

The design of a wideband G-Band travelling wave tube (TWT) using the staggered double-vane (SDV) slow-wave structure (SWS) combined with sheet electron beam is described. A novel Bragg reflector which consists of only one simple period structure connected to the SWS is brought forward with good input/output coupling and high transmission characteristics with almost 80 GHz band width. Particle in cell (PIC) simulations predict that the Bragg reflector SDV-TWT can work with more stability to produce high output power. Furthermore, when the beam voltage is of 21kV and beam current of 0.25A respectively, our 90 periods sheet beam SDV-TWT can produce over 560W of peak power at 220 GHz within the total length of 43.6 mm, with a corresponding gain of 40.5 dB, an electronic efficiency of 5.3%, and the 3dB bandwidth is about 35GHz.

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