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Nb-based SIS mixer in the 800 GHz band

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4 Author(s)
T. Noguchi ; Nobeyama Radio Obs., Nagano, Japan ; H. Maezawa ; Sheng-Cai Shi ; S. Yamamoto

We have built a waveguide SIS mixer with Nb-based parallel-connected twin junctions at 800 GHz which is above the gap frequency of Nb (690 GHz). Heterodyne mixing was performed at 810 GHz and a receiver noise temperature of 580 K (DSB), which includes noise contributions due to a vacuum window and a beam splitter, was achieved using Nb/AlOx/Nb junctions with Nb striplines. The performance of this mixer is quite good and it is shown that efficient mixing in Nb-based SIS junctions is still possible above the gap frequency, SIS mixers with Al striplines have also been fabricated and good DC I-V characteristics have been observed. Heterodyne measurements of these mixers are now under preparation

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:11 ,  Issue: 1 )