K. Krishnamurthi et Rg. Harrison, MILLIMETER-WAVE FREQUENCY TRIPLING USING STACKED HETEROSTRUCTURE-BARRIER VARACTORS ON INP, IEE proceedings. Microwaves, antennas and propagation, 143(4), 1996, pp. 272-276
Heterostructure-barrier varactors (HBVs) reported previously had limit
ed power output. By using a pseudomorphic In0.52Al0.48As/AlAs/In0.52Al
0.48As barrier with good current blocking characteristics and stacking
three MBE-grown varactor layers. we achieve a symmetric stacked varac
tor on InP with low leakage and high breakdown voltage (similar to 14
V). Tripler experiments at Ka band using these varactors give 20 dBm o
utput with 7 dB conversion loss using a waveguide multiplier: and 10.8
dBm with 11 dB conversion loss using a microstrip circuit. These are
the first HBVs to demonstrate reduced device capacitance per unit area
and freedom from resistive tripling effects.