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oai:recercat.cat:2117/13712025-07-17T14:03:03Zcom_2072_1033col_2072_452950

Detuning and saturation of superconducting devices: formulation and measurements Collado Gómez, Juan Carlos Mateu Mateu, Jordi Booth, James C. O'Callaghan Castellà, Juan Manuel Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques Electric lines Superconducting Electronic apparatus and appliances Detuning HTS Nonlinear transmission line Saturation Superconductor Superconducting resonator Superconductors Dispositius electrònics 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 Peer Reviewed 2007-06 Conference report Collado, 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. 0149-645X https://hdl.handle.net/2117/1371 eng Detuning and saturation of superconducting devices: formulation and measurements Open Access 4 application/pdf Institute of Electrical and Electronics Engineers