Exponentially tapered Josephson flux-flow oscillator

A. Benabdallah, J. G. Caputo, Alwyn C. Scott

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    We introduce an exponentially tapered Josephson flux-flow oscillator that is tuned by applying a bias current to the larger end of the junction. Numerical and analytical studies show that above a threshold level of bias current the static solution becomes unstable and gives rise to a train of fluxons moving toward the unbiased smaller end, as in the standard flux-flow oscillator. An exponentially shaped junction provides several advantages over a rectangular junction including: (i) smaller linewidth, (ii) increased output power, (iii) no trapped flux because of the type of current injection, and (iv) better impedance matching to a load.
    Original languageEnglish
    JournalPhysical Review B
    Issue number22
    Pages (from-to)16139-16146
    Publication statusPublished - 1996

    Bibliographical note

    Copyright (1996) American Physical Society.

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