30 August 1993 Microstrip resonator using high-Tc superconducting thin film on sapphire substrates
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Proceedings Volume 2104, 18th International Conference on Infrared and Millimeter Waves; 21046T (1993) https://doi.org/10.1117/12.2298677
Event: 18th International Conference on Infrared and Millimeter Waves, 1993, Colchester, United Kingdom
Abstract
We have measured very low microwave losses in Y-Ba-Cu-0 fifth wave ring re- sonators. We deposited the Y-Ba-Cu-0 film on (1012) non-buffered sapphire sub- strates and patterned microwave circuites. High-Tc microstrip resonators de- monstrated best Q-factor greater then 800 at 31 GHz, corresponding to surfaceresistences less than 3,0 mohm. Indetical copper resonator showed Q's of 500and surface resistance of 27 mohm. We show that the losses in the high losssamples can be accounted for by the presence of small fractions of c-axis- aligned grains highly misaligned in the plane of those films. Volume fractionof highly misagned c-axis-oriented grains as 3% lead to losses above 3 mohm.
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O. D. Pustylnik, O. D. Pustylnik, } "Microstrip resonator using high-Tc superconducting thin film on sapphire substrates", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21046T (30 August 1993); doi: 10.1117/12.2298677; https://doi.org/10.1117/12.2298677
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