Pb/Bi/In and Nb/Al junctions for a 345 GHz open structure astronomical receiver

Details Pb/Bi/In and Nb/Al junctions for a 345 GHz open structure astronomical receiver Pb/Bi/In and Nb/Al junctions for a 345 GHz open structure astronomical receiver

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993itas....3.2617g&link_type=abstract

IEEE Transactions on Applied Superconductivity (ISSN 1051-8223), vol. 3, no. 1, pt. 4, p. 2617-2620.

Astronomy and Astrophysics

Astronomy

Heterodyning, Lead (Metal), Microwave Transmission, Niobium, Radio Astronomy, Radio Receivers, Aluminum Oxides, Bismuth, Frequency Response, Indium, Transmission Lines

Scientific paper

The authors report on the preparation and properties of Pb/Bi/In- oxide-Pb/Bi and Nb-Al oxide-Nb junctions prepared for a 345-GHz open-structure heterodyne receiver. The lowest receiver noise temperature with the Pb/Bi/In junctions is 215 K DSB. In this case, no matching network is integrated to tune out the junction capacitance. For the Nb/Al junctions, a microwave transmission line compensates the capacitance around 345 GHz. With the Nb-Al oxide-Nb two-junction array at 4.2 K, the lowest receiver noise temperature is 80 K at 330 GHz. The receiver is in use at the IRAM 30-m telescope in Spain.

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