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Summary form only given. In principle, grating-coupled oscillators can provide useful levels of radiation over a range extending from centimeter to micrometer wavelengths. In order to assess the difficulties associated with operating over this very large range, a general theory has been developed. It is structured in a manner which clearly displays the scaling of all essential performance criteria...
State-of-the-art millimeter-wave power transistors using quantum-well MISFET structures have been developed. Single- and double-quantum-well devices have been built, with maximum currents of 700 mA/mm for the single-well and 900 mA/mm for the double-well devices. The single-well devices delivered a power density of 0.76 W/mm with 3.6-dB gain and 19% efficiency at 60 GHz. The double well MISFETs had...
The final preparations for bringing the University of Maryland's 10-GHz, 30-MW gyroklystron experiment online are discussed. The authors explain the enhanced circuit modeling and present a two-cavity design with a predicted efficiency of 33% and gain of 27 dB for the simulated beam parameters. They then describe initial operation of the modulator and electron gun and detail the experimental design...
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