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Noise temperature measurement of YBCO Josephson mixers in millimeter and submillimeter waves

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4 Author(s)
H. Shimakage ; Lab. of Commun. Res., Kansai Adv. Res. Centre, Kobe, Japan ; Y. Uzawa ; M. Tonouchi ; Z. Wang

We have investigated YBCO step-edge Josephson junctions as millimeter and submillimeter wave mixers. These mixers were integrated with an Au thin-film log-periodic antenna designed for broadband coupling of the radiation. We estimated the noise temperature of the mixer using conventional hot/cold blackbody irradiation techniques in the 100- and 300-GHz bands. We found that the Au thin-film antenna yielded about 5 dB higher coupling efficiency than that of YBCO thin film antenna, and the noise temperature decreased from 2,800 K to 1,800 K. The best receiver noise temperature, 1,200 K, was achieved in the 300-GHz band through improvement in impedance matching.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:7 ,  Issue: 2 )