Microwave resonators incorporating ceramic YBaCuO helices

Measurements of the unloaded Q-factors of resonators incorporating YBaCuO helices are presented as a function of temperature. All of the bulk helices give unloaded Qs higher at 77 K for frequencies less than 1 GHz than equivalent wholly Cu structures. Approximate microwave modeling of the resonator...

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Bibliographic Details
Published in:IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1991-03, Vol.27 (2), p.2948-2951
Main Authors: Porch, A., Lancaster, M.J., Maclean, T.S.M., Gough, C.E., Alford, N.M.
Format: Article
Language:English
Subjects:
360204 > Ceramics, Cermets, & Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
Applied sciences
BARIUM COMPOUNDS
BARIUM OXIDES
Ceramics
CHALCOGENIDES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
COPPER OXIDES
Dielectric loss measurement
Dielectric measurements
DIELECTRIC PROPERTIES
Dielectric substrates
ELECTRICAL PROPERTIES
Electrical resistance measurement
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
Electronics
ENERGY LOSSES
Exact sciences and technology
FILTERS
Frequency
HELICAL WAVEGUIDES
Loss measurement
LOSSES
MATERIALS SCIENCE
MICROWAVE RADIATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
Q measurement
QUALITY FACTOR
RADIATIONS
RESONATORS
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
Temperature
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
WAVEGUIDES
Yttrium barium copper oxide
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS 665412 > Superconducting Devices-- (1992-)
ZIRCONIUM OXIDES
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Description
Summary:Measurements of the unloaded Q-factors of resonators incorporating YBaCuO helices are presented as a function of temperature. All of the bulk helices give unloaded Qs higher at 77 K for frequencies less than 1 GHz than equivalent wholly Cu structures. Approximate microwave modeling of the resonator gives surface resistances around 1 m Omega at 77 K and 500 MHz. Initial measurements on thick-film YBaCuO helices give Q values significantly lower than the bulk, probably due to dielectric loss in the zirconia substrate. The enhancement in Q over similar Cu resonators make these devices useful for demonstration purposes. For practical applications, however, it is unlikely that the improvement observed will affect the status of low-noise microwave oscillators and filters.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.133827