Modeling the behavior of HTS terahertz RSQUIDs

C. M. Pegrum, J. C. Macfarlane, J. Du

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


In previous work we looked in detail at simulations of our HTS Resistive DC SQUIDs (RSQUIDs) using a lumped-component model and neglecting step-edge junction capacitance. These can now be made with junctions that have a high product of critical current and normal resistance (IcRJ) and so the Josephson frequency can be above 1 THz. This calls for a more refined model of the device, which we will present here. The RSQUID series resistor is represented as a distributed combination of resistance and inductance, rather than simply a resistor in series with its self inductance. We now include junction capacitance, as the Stewart-McCumber parameter can be close to unity. We treat the RSQUID loop as a co-planar stripline, rather than as an inductor. We report a range of simulations with these enhancements to the model and comment briefly on the results in relation to potential applications of RSQUIDs as active microwave devices.

Original languageEnglish
Pages (from-to)349-353
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - Jun 2011


  • noise thermometer
  • heterodyning
  • dc squid
  • squids
  • oscillator
  • josephson mixers
  • film resistive squids
  • josephson oscillators
  • substrate
  • temperature
  • superconducting microwave devices
  • modeling
  • behavior
  • hts terahertz
  • rsquids


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