Diamond Substrate Planar Slow-Wave Structures for Millimeter Wave Traveling Wave Tubes

Traveling wave tubes (TWTs) are commonly used to amplify radio frequency signals in a variety of applications, including radar systems, satellite communication. In this paper, we investigate the use of diamond substrate planar slow-wave structures (D-PSWS) in TWTs operating at 210 GHz. We describe the design and a possible fabrication process of D-PSWS. The simulations show the possibility of achieving a gain higher than 30 dB at a frequency of 210 GHz with a bandwidth of 1 GHz, and a maximum output power of 4.5 W.