Propagation characteristics of surface acoustic waves induced by a high-Tc superconducting thin film

The surface impedance concept of a high Tc superconducting thin film based on the Two-fluid model is used to study the propagation characteristics of a surface acoustic wave (SAW). In this study, the attenuation constant is depicted to discuss the effects due to frequency and temperature (mechanism of the losses). The slow wave propagation characteristics associated with the high temperature superconductivity (HTS) thin film technology make it possible to manufacture a compact-size circuit in microwave systems. The obtained results show that, low loss and negative part is occurred. As a results of low loss and hence negative part, the implementation of high gain amplifier becomes possible. The computer simulation results are verified by comparison with results using surface impedance formula of Mattis-Bardeen theory and show a good agreement.