Abstract
A mm-wave Josephson integrated mixing circuit has been fabricated. In the circuit, an Nb-Te-Nb sandwich Josephson junction was used as the active element. Both RF and IF circuitries were made in the form of superconducting microstriplines using Si wafer as the dielectric layer. The signal and local powers were fed through tapered ridge waveguides, which were coupled into the stripline with small loss. The circuit was tested at 50-GHz signal frequency and the conversion efficiency was measured at −7.4 dB, for a junction with 0.4-mV ICRN product. The measured efficiency showed good agreement with the theoretical prediction.
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