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Observation of Frequency Up-Conversion Gain in SIS Junctions at W Band

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Abstract

We have developed a test setup to measure frequency up-conversion gain in superconductor–insulator–superconductor (SIS) junctions at W band (75–110 GHz). A conventional SIS mixer with Nb/AlOx/Nb tunnel junctions was used as a frequency up-converter. An up-converted signal is measured by a room-temperature down-converter system. We observed distinct intermediate frequency responses to signal inputs from a continuous microwave source. The measured single-sideband up-conversion gain in SIS junctions was clearly positive (> 0 dB) with input frequency less than 2 GHz, which was well-calibrated by using an input from the continuous-wave source.

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Acknowledgements

This work was supported by JSPS KAKENHI under Grants JP19H02205 and JP18H03881.

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Authors and Affiliations

  1. University of Electro-Communications, Chofu, Japan

    Y. Kozuki & T. Sakai

  2. National Astronomical Observatory of Japan, Mitaka, Japan

    Y. Uzawa, T. Kojima & W. Shan

Authors
  1. Y. Kozuki
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  2. Y. Uzawa
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  3. T. Kojima
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  4. W. Shan
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  5. T. Sakai
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Correspondence to Y. Kozuki.

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Kozuki, Y., Uzawa, Y., Kojima, T. et al. Observation of Frequency Up-Conversion Gain in SIS Junctions at W Band. J Low Temp Phys 200, 255–260 (2020). https://doi.org/10.1007/s10909-020-02470-x

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  • DOI: https://doi.org/10.1007/s10909-020-02470-x

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