A procedure of extracting the model parameters of a high-temperature superconductor (HTS) film from the experimental characteristics of resonators and filters is proposed. It is based on a correct phenomenological model of the HTS film surface impedance and an accurate simulation of the filter (resonator) structure by taking into account the temperature dependence of the dielectric permittivity of the substrate and its thermal expansion coefficient. The experimental characteristics measured at different temperatures have to be used. The procedure was successfully applied, in order to extract the HTS film parameters from the characteristics of a single hairpin microstrip resonator and an 11-pole hairpin-comb filter. The proposed procedure of extracting the model parameters seems suitable to be used at an earlier stage in the design of high-performance trimmingless HTS devices.
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Deleniv et al. (2000) studied this question.
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