Extracting surface impedance model parameters of a high-temperature superconductor from experimental characteristics of a microstrip resonator

We describe a method for extracting the model parameters of a high-temperature superconductor (HTSC) film from experimental resonance characteristics of a microstrip resonator. The method is based on a correct phenomenological model of the surface impedance of an HTSC film and the exact calculation of the microstrip resonator characteristics. The procedure of extracting the model parameters from experimental data is realized by using a genetic algorithm. Based on the models described, a special program implementing this mathematical algorithm was written, which allows the HTSC model parameters to be determined from experimental data.