Design of Ka-Band High-Power TWT

A Ka-band traveling wave tube (TWT) with an output power above 5kw, an electronic efficiency above 10% in the bandwidth of 33–37GHz was designed. The structure of slow wave adopts folded waveguide. The folded waveguide TWT has a saturated gain of 43.5dB, peak power of 6.7kW and electronic efficiency of 10.54% at 35GHz. We also have designed the electronic optical system, simulation results show the electron gun voltage is 28Kv, and transmitted beam current is 2.54A.