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

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...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.2617-2620
Main Authors: Gundlach, K.H., Grassl, C., Billon-Pierron, D., Rothermel, H.
Format: Article
Language:English
Subjects:
Astronomical and space-research instrumentation
Astronomy
Bismuth
Capacitance
Dipole antennas
Earth, ocean, space
Electrodes
Exact sciences and technology
Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations
Lead
Low pass filters
Niobium
Radio telescopes and instrumentation
heterodyne receivers
Receivers
Temperature
Wiring
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Summary: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 (Institut de Radio Astronomie Millimetrique) 30-m radio telescope in Spain.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233520