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Nonhysteretic Josephson tunnel junctions for microwave detection

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3 Author(s)
Hartfuss, H.J. ; Max‐Planck‐Institut für Astrophysik, 8046 Garching/München, Germany ; Gundlach, K.H. ; Schmidt, V.V.

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We report on direct and heterodyne detection of 70‐GHz radiation, using nonhysteretic superconductor‐insulator‐superconductor Josephson junctions with μm dimensions. The best value of noise equivalent power in the direct detection experiments was about 10-14 W at 1‐Hz postdetection bandwidth and the best single sideband conversion efficiency in the heterodyne mode L-1c = -10 dB. In an experiment with L-1c = -11 dB a mixer noise temperature, including noise of the impatt local oscillator, of 2300 K is estimated.

Published in:

Journal of Applied Physics  (Volume:52 ,  Issue: 9 )

Date of Publication:

Sep 1981

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