Articles by James J. Rosenberg, Michael P. DeLisio and Blythe C. Deckman Wavestream Corp., Chun-Tung Cheung and David B. Rutledge California Institute of Technolo

There are a number of communications, radar and imaging applications spanning Ka-band through W-band (26 to 110 GHz) that require transmitter output powers in the range of a few watts to a few tens of watts. Vacuum-tube sources and amplifiers have long been available that can produce output power...