Development and modeling of a G-band sheet-beam traveling wave tube amplifier with grating slow-wave structure

Sheet-beam traveling-wave tubes (TWTs) and backward-wave oscillators (BWOs) with grating slow-wave structures (SWS) have attracted a considerable interest as THz and sub-THz power amplifiers [1]. Such devices can find wide application as compact sources with relatively high power for communications, radar, sensors, imaging, etc. In this paper, we present the results of research aimed at development of the G-band (0.22 THz) TWT amplifier with double- and singlegrating SWS and a sheet electron beam. For 3D numerical modeling we developed a fast and accurate approach based on the integral equation method (IEM). Detailed description of the method is presented in [2]. Using the code, we optimized the dimensions of the SWS to achieve rather wide passband about 70 GHz and interaction impedance about 1 Ohm, which is sufficient to achieve 20 dB gain.