Josephson tunnel junction microwave attenuator

V. P. Koshelets, S. V. Shitov, A. V. Shchukin, A. M. Baryshev, L. V. Filippenko, Gerd Michael Fischer, Jesper Mygind

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A new element for superconducting electronic circuitry-a variable attenuator-has been proposed, designed, and successfully tested. The principle of operation is based on the change in the microwave impedance of a superconductor-insulator-superconductor (SIS) Josephson tunnel junction when dc biased at different points in the current-voltage characteristic. Both numerical calculations based on the Tien-Gordon theory and 70-GHz microwave experiments have confirmed the wide dynamic range (more than 15-dB attenuation for one stage) and the low insertion loss in the ''open'' state. The performance of a fully integrated submillimeter receiver circuit which comprises a flux-flow oscillator (FFO) as local oscillator, a superconducting variable attenuator, and a microwave SIS detector with tuned-out capacitance is also reported.
Original languageEnglish
JournalApplied Physics Letters
Issue number23
Pages (from-to)3218-3220
Publication statusPublished - 1993

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Copyright (1993) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics


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