Abstract
This paper investigates the nonlinear effects ofhigh-Tc superconducting (HTS) thin film in high-power applications. A nonlinear model forcomplex surface impedance has been proposed for the efficient analysis of the nonlinearityof HTS thin films. Further, using the developed model, analysis of HTS-MSR hasbeen done using the spectral domain method (SDM). The SDM formulation hasbeen modified to account for finite conductivity and thickness of HTS films byincorporating a complex resistive boundary condition. The results have been validatedwith the experiments performed with microstrip resonators (MSRs) based onYBa2Cu3O7−x (YBCO) thin films made by a laser ablation technique onLaAlO3 substrates, characterized for their characteristics, namely, resonant frequency and qualityfactor measured as a function of temperature and input RF power. A close agreementbetween the theoretical and measured results has been achieved validating the analysis.
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