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High temperature superconductor films and devices for the microwave communication industry
N. J. Long,J. Joubert,T. Kemmitt,L. J. Campbell,A. J. Bubendorfer 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
High temperature superconductor (HTS) thin lms can be used to construct microwave devices such as lters and antennas withsuperior performance. We show how the lms can be manufactured using a solgel method which has the advantage of being able toproduce large area lms quickly, at low cost on simple equipment. We have developed a solgel precursor which has the additionalbenets of using commonly available non-toxic reagents, and which can be prepared quickly. HighTc and high Jc lms have beenmade with this precursor. These lms can be patterned to make microwave lters with better sensitivity and selectivity than con-ventional lters. Adesignfora microstriplayout ofaquasi-elliptic bandpass filter which can be implemented ona10 m×10mm film is described. Simulated results comparing lter implementations with metal and superconductor films operating at 77 K are given.