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Subharmonically Pumped Millimeter-Wave Upconverters Based on Heterostructure Barrier Varactors

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5 Author(s)
Haiyong Xu ; Dept. of Phys., Virginia Univ., Charlottesville, VA ; Duan, Y. ; Hesler, J.L. ; Crowe, T.W.
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A heterostructure barrier varactor subharmonic upconverter is investigated for the first time. Odd sidebands are suppressed due to the symmetric capacitance-voltage (C-V) characteristic of the varactor and high output power is possible through epitaxial stacking of barriers. The upconverter is pumped using a millimeter-wave local oscillator, and can be used as a transmission-type double-sideband suppressed carrier modulator. The initial measured conversion loss is 8-16 dB at 100 and 200 GHz. The results are significantly improved by using external impedance tuners, which is verified through both simulations and measurements

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 10 )