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A low noise 230 GHz heterodyne receiver employing .25 sq micron area Nb/AlO(x)/Nb tunnel junctionsRecent results for a full height rectangular waveguide mixer with an integrated IF matching network are reported. Two 0.25 sq micron Nb/AlO(x)/Nb superconducting insulating superconducting (SIS) tunnel junctions with a current density of about 8500 A/sq cm and omega RC of about 2.5 at 230 GHz have been tested. Detailed measurements of the receiver noise have been made from 200-290 GHz for both junctions at 4.2 K. The lowest receiver noise temperatures were recorded at 239 GHz, measuring 48 K DSB at 4.2 K and 40 K DSB at 2.1 K. The 230 GHz receiver incorporates a one octave wide integrated low pass filter and matching network which transforms the pumped IF junction impedance to 50 ohms over a wide range of impedances.
Document ID
19920063445
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kooi, Jacob W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chan, M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Phillips, T. G.
(California Institute of Technology Pasadena, United States)
Bumble, B.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Leduc, H. G.
(JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1992
Publication Information
Publication: IEEE Transactions on Microwave Theory and Techniques
Volume: 40
Issue: 5 Ma
ISSN: 0018-9480
Subject Category
Electronics And Electrical Engineering
Accession Number
92A46069
Funding Number(s)
CONTRACT_GRANT: NSF AST-90-15755
CONTRACT_GRANT: NAGW-107
Distribution Limits
Public
Copyright
Other

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