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    Compact Superconducting Dual-Log Spiral Resonator with High Q-Factor and Low Power Dependence.

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    Publication date
    2002
    Author
    Excell, Peter S.
    Hejazi, Z.M.
    Keyword
    Quaternary compound
    Copper oxide
    Barium oxide
    Yttrium oxide
    Experimental study
    Resonance frequency
    Insertion loss
    Current density
    Logarithmic function
    Low-power electronics
    Spiral shape
    High temperature superconductor
    Superconducting thin films
    Superconducting microwave devices
    Superconducting resonator
    High Q factor
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    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    A new dual-log spiral geometry is proposed for microstrip resonators, offering substantial advantages in performance and size reduction at subgigahertz frequencies when realized in superconducting materials. The spiral is logarithmic in line spacing and width such that the width of the spiral line increases smoothly with the increase of the current density, reaching its maximum where the current density is maximum (in its center for ¿/2 resonators). Preliminary results of such a logarithmic ten-turn (2 × 5 turns) spiral, realized with double-sided YBCO thin film, showed a Q.-factor seven times higher than that of a single ten-turn uniform spiral made of YBCO thin film and 64 times higher than a copper counterpart. The insertion loss of the YBCO dual log-spiral has a high degree of independence of the input power in comparison with a uniform Archimedian spiral, increasing by only 2.5% for a 30-dBm increase of the input power, compared with nearly 31% for the uniform spiral. A simple approximate method, developed for prediction of the resonant frequency of the new resonators, shows a good agreement with the test results.
    URI
    http://hdl.handle.net/10454/3260
    Version
    No full-text available in the repository
    Citation
    Excell, P.S. and Hejazi, Z.M.(2002) Compact Superconducting Dual-Log Spiral Resonator with High Q-Factor and Low Power Dependence. IEEE Transactions on Applied Superconductivity. Vol. 12, No. 2, pp. 1813-1817.
    Link to publisher’s version
    http://dx.doi.org/10.1109/TASC.2002.1020342
    Type
    Article
    Collections
    Engineering and Digital Technology Publications

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