In this article, the first 237 GHz traveling wave tube (TWT) is presented as a high-power amplifier for terahertz (THz) cloud radar. As common with previous G-band tubes developed at Beijing Vacuum Electronics Research Institute, employs 20 kV, 50 mA pencil electron beam focused using periodic permanent magnets (PPMs) to achieve compactness. A folded waveguide (FWG) slow-wave structure (SWS) mo...
