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Proceedings Paper

145-GHz-Frontend with Superconductor-Isolator-Superconductor (SIS)-Mixer
Author(s): I. Hilberath; B. Vowinkel; K. H. Gundlach
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Paper Abstract

A 145 GHz SIS mixer frontend for the Cologne 3-m-radiotelescope and the results of our first measurements are described. The mixer uses a Pb/Bi/In-Oxide-Pb/Bi junction mounted in a quarter height waveguide. It is built in split block technique with an integrated directional coupler for LO coupling. RF tuning is made via a circular non-contacting backshort. All parts of the mixer block are easy to fabricate so that the design may be scaled to frequencies in the submillimeter wave region. The mixer is cooled to 2.8 K by using a closed cycle refrigerator. The IF amplifier whose first two stages are cooled to 18 K by the second stage of the cryogenerator has a noise temperature below 10 K in a frequency band of 250 MHz around the center frequency of 1.4 GHz. First measurements show a system noise temperature of 100 - 120 K (DSB) in the 140 to 145 GHz band.

Paper Details

Date Published: 21 April 1986
PDF: 7 pages
Proc. SPIE 0598, Instrumentation for Submillimeter Spectroscopy, (21 April 1986); doi: 10.1117/12.952314
Show Author Affiliations
I. Hilberath, Universitaet Koeln (Germany)
B. Vowinkel, Universitaet Koeln (Germany)
K. H. Gundlach, IRAM (France)

Published in SPIE Proceedings Vol. 0598:
Instrumentation for Submillimeter Spectroscopy
Erik L. Kollberg, Editor(s)

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