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Published June 1994 | public
Journal Article Open

A 492 GHz quasioptical SIS receiver for submillimeter astronomy


A 492 GHz quasioptical superconductor-insulator-superconductor (SIS) heterodyne receiver for submillimeter astronomy has been constructed with a double-sideband noise temperature of 170±25 K, where the system response is an average over a 600 MHz i.f. bandwidth centered at 1.5 GHz. The excellent sensitivity is achieved through use of a planar twin-slot antenna feeding a pair of Nb–Al2O3–Nb junctions linked by an inductance. A main beam of f/15 has been measured. The performance of this receiver is comparable to that of the best 492 GHz waveguide receivers currently in operation.

Additional Information

Copyright © 1994 American Institute of Physics. (Received 31 January 1994; accepted 24 February 1994) We wish to thank Rick LeDuc for the fabrication of the SIS junctions, Ed Sutton for helpful discussions and Jacob Kooi, David Miller, and Greg Wright for assistance with laboratory measurements. G. Engargiola and K.Y. Lo acknowledge partial support by the National Science Foundation under a cooperative agreement with the Center for Astrophysical Research in Antarctica, grant number NSF DPP 89-20223. J. Zmuidzinas acknowledges partial support by NASA (NAGW-107 and NAG2-744), NASA/JPL, and a NSF Presidential Young Investigator grant.


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August 22, 2023
August 22, 2023