Fraunhofer regime of operation for superconducting quantum interference filters

A.V. Shadrin, K.Y. Constantinian, G.A. Ovsyannikov, S.V. Shitov, I.I. Soloviev, V.K. Kornev, Jesper Mygind

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Series arrays of superconducting quantum interference devices (SQUIDs) with incommensurate loop areas, so-called superconducting quantum interference filters (SQIFs), are investigated in the kilohertz and the gigahertz frequency range. In SQIFs made of high-T-c bicrystal junctions the flux-to-voltage response partial derivative V/partial derivative Phi is dominated by the variation in the critical current in the individual junctions (Fraunhofer-type) rather than by the SQUIDs interference. For a SQIF with 20 SQUID loops we find partial derivative V/partial derivative Phi=40 mV/Phi(0) and a dynamic range of more than 60 dB in the kilohertz range. In the 1-2 GHz range the estimated power gain is 20 dB and the magnetic flux noise level is as low as 10(-4)Phi(0).
Original languageEnglish
JournalApplied Physics Letters
Issue number26
Pages (from-to)262503
Publication statusPublished - 2008

Bibliographical note

Copyright (2008) 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.


  • critical currents
  • magnetic flux
  • high-temperature superconductors
  • flux-line lattice
  • SQUIDs
  • superconducting filters
  • superconducting arrays
  • superconducting microwave devices

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