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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Abstract

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
Volume63
Issue number23
Pages (from-to)3218-3220
ISSN0003-6951
DOIs
Publication statusPublished - 1993

Bibliographical note

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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