A 40 GHz band SIS mixer receiver has been built using Nb/Al−AlOx/Nb array junctions and a 4.3 K closed cycle helium refrigerator. The minimum conversion loss of the mixer is 2±1 dB and the single sideband receiver noise temperature (TRX (SSB)) is as low as 110±10 K at 36 GHz. TRX (SSB) is almost constant in the IF bandwidth of 600 MHz. The mixer saturation level is as high as 15 nW, which is comparable to the injected LO power.
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Nobeyama Radio Observatory (NRO), a branch of the Tokyo Astronomical Observatory, University of Tokyo, is a cosmic radio observing facility open for outside users.
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Tsuboi, M., Inatani, J., Kasuga, T. et al. A 40 GHz band SIS receiver using Nb/Al−AlOx/Nb array junctions. Int J Infrared Milli Waves 8, 1–11 (1987). https://doi.org/10.1007/BF01010641
- millimeter wave receiver
- SIS junctions