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High-Tc-superconductor-sapphire microwave resonator with extremely high Q-values up to 90 K

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6 Author(s)
Shen, Zhi-Yuan ; E.l. DuPont de Nemours & Co. Inc., Wilmington, DE, USA ; Wilker, C. ; Pang, Philip ; Holstein, W.L.
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A theoretical analysis was performed for an extremely high-Q resonator formed by a sapphire rod sandwiched by a pair of high- Tc superconductor (HTS) films. A number of these HTS-sapphire-HTS resonators at C-band and Ka-band were designed, fabricated, and tested. At 5.552 GHz, Q0 reached 2×106 at 90 K, 3×106 at 80 K and 1.4×107 at 4.2 K with circulating power up to 500 kW. Formulas for calculating the resonant frequency and Q-value derived from the theoretical analysis were verified by experimental data with good agreement. Three different thin-film HTS materials-Tl2 Ba2CaCu2O8, YBa2Cu3O7-δ and Tl0.5Pb0.5Sr2CaCu2O7 -were tested. The sensitivity of the high Q-value and the parasitic coupling to the case modes are discussed. Applications such as frequency stabilized oscillators, filters, and HTS film characterization are described

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:40 ,  Issue: 12 )

Date of Publication:

Dec 1992

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