A novel conception of improved matching for both input and output mixer ports has been developed and confirmed successfully with experimental receivers in the 40-180-GHz frequency range. Parallel and parallel-series combinations integrated up to 11 Nb-AlO/sub x/-Nb type superconductor-insulator-superconductor (SIS) junctions have been tested in full-height waveguide mixers. Receivers' noise temperatures T/sub r/(DSB)>
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Shitov et al. (1993) studied this question.
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