Dielectric, serpentine, and loaded-helix slow wave structures for W-band traveling wave tubes

Designs and simulated performance for W-band traveling wave tubes are presented for three slow wave structure types (dielectric, serpentine waveguide, and cavity-loaded helix). Output powers are 120 and 245 W at 94 GHz for dielectric and serpentine, respectively, with 5–6 GHz bandwidth (9 GHz in serpentine with equalization).