This paper describes the development of high-Tc, superconducting YBCO films for high-performance RF filters. The use of a high-Q filter is expected to provide high selectivity and high sensitivity in the base stations of mobile telecommunication systems. 2 GHz-band microstripline resonators have been fabricated by pulsed laser deposition of YBCO films and they have been used to study the relationships between the Q, microstructure, and film-thickness of YBCO films.
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