A tuner-less heterostructure barrier varactor (HBV) frequency tripler has been designed, fabricated, and tested. A conversion efficiency of 7.2% and output power of 6.5 mW were measured at 270 GHz with 90 mW of input power. The performance of this tuner-less HBV tripler is comparable with other HBV frequency multipliers reported in the literature that utilize mechanical tuners to optimize their performance
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Xiao et al. (2007) studied this question.
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