Recent Advances in the Studies of Frequncy Multipers at Millimeter and Submillimeter Wavelengths

Frequency multipliers are used to generate local oscillator power for heterodyne receivers at millimeter and submillimeter wavelengths. So far, these multipliers are mainly based on a whisker-contacted Schottky diode as the nonlinear element. This paper discusses three topics: 1) modelling of the Schottky varactor, 2) novel multiplier diodes such as-single-barrier varactor (SBV) and back-to-back barrier-N-N+ diode (bbBNN) as millimeter and submillimeter frequency multipliers, and 3) a novel split-waveguide multiplier mount especially suitable for planar varactor diodes.