Detuning and saturation of superconducting devices: formulation and measurements
Document typeConference report
PublisherInstitute of Electrical and Electronics Engineers
Rights accessOpen Access
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Saturation and detuning of high temperature superconducting (HTS) resonators and filters may occur due to the inherent nonlinear properties of the superconductor. In HTS transmission lines, these nonlinear properties introduce a dependence of the inductance and resistance per unit length on the current through the line and, if the line forms a resonator, this current dependence provokes changes in quality factor and/or resonant frequency with incident power. This paper derives equations for the dependence of the quality factor and resonant frequency of a nonlinear transmission line vs. source power and relates it to the circuit parameters of a nonlinear transmission line. The equations are verified with measurements in a 3.3 GHz YBa2Cu3O7-x (YBCO) coplanar waveguide (CPW) resonator at 76 K and with simulations using harmonic balance
CitationCollado, C.; Mateu, J.; Booth, J. C.; O'Callaghan, J. Detuning and saturation of superconducting devices: formulation and measurements. IEEE MTT-S International Microwave Symposium, 2007. New York: Institute of Electrical and Electronic Engineers, 2007, p. 2023-2026.