In-Phase Power-Combined Frequency Tripler at 300 GHz
NASA’s Jet Propulsion Laboratory
Sunday, February 01 2009
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This compact, tunable, broadband, high-power design is suitable for radar as well as for driving imaging arrays of heterodyne spectrometers.
This design starts with commercial 85- to 115-GHz sources that are amplified to as much as 250 mW using power amplifiers developed for the Herschel Space Observatory. The frequency is then tripled using a novel waveguide GaAs Schottky diode frequency tripler. This planar diode produces 26 mW at 318 GHz. Peak conversion efficiency is over 15 percent, and the measured bandwidth of about 265–330 GHz is limited more by the driving source than by the tripler itself.
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