Transmission Characteristics of Double Staggered Grating Waveguide SWS: Simulation and Measurement

Abstract

Transmission characteristics of a double staggered grating waveguide (DSGW) slow wave structure (SWS) with transition waveguides and input & output windows are presented. The DSGW-SWS was designed to operate at the band of 90–100 GHz. The output power of over 1000 W at the bandwidth of 4 GHz was obtained by PIC simulation. The current of sheet beam is 0.5 A. The single segment DSGW-SWS is used in the TWT for ensuring stable transmission of high beam-current. The DSGW-SWS circuit was fabricated and experimentally tested for its cold behavior. The measured S-parameters $\\pmb{(S_{11})}$ is less than −10 dB in the band of 94-100GHz. The Voltage Stand Wave Ratio (VSWR) shows a good agreement with the simulation results. The research results provide a perfect DSGW-SWS circuit for the successful development of W-band sheet beam TWT.