Millimeter wave mixing with submicron area Nb tunnel junctions

Millimeter wave mixing with submicron area Nb tunnel junctions

Submicron area Nb edge tunnel junctions have been fabricated yielding devices with RC times of 10−13 s. Tested as quasiparticle mixers at 55 GHz, they yielded conversion loss of 6.4 db SSB and a noise temperature ?27 K. A gain of 1.4 db with a noise temperature of 145 K was also achieved but was att...

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Veröffentlicht in:J. Appl. Phys.; (United States) 1982-02, Vol.53 (2), p.823-827
Hauptverfasser: Callegari, A. C., Buhrman, R. A.
Format: Artikel
Sprache:eng
Schlagworte:
420201 - Engineering- Cryogenic Equipment & Devices
AMPLIFICATION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DATA
ELEMENTS
ENERGY LOSSES
FABRICATION
FREQUENCY CONVERTERS
GAIN
INFORMATION
JOSEPHSON EFFECT
JUNCTIONS
LOSSES
METALS
NIOBIUM
NOISE
REFRACTORY METALS
TEMPERATURE NOISE
TRANSITION ELEMENTS
TUNNEL EFFECT
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Zusammenfassung:Submicron area Nb edge tunnel junctions have been fabricated yielding devices with RC times of 10−13 s. Tested as quasiparticle mixers at 55 GHz, they yielded conversion loss of 6.4 db SSB and a noise temperature ?27 K. A gain of 1.4 db with a noise temperature of 145 K was also achieved but was attributed to the Josephson effect.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.330587