Fabrication and characterization of high T sub c superconducting x-band resonators and bandpass filters

Conference · Thu Feb 28 23:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6089666

Rensch, D B; Josefowicz, J Y; Mac Donald, P; Nieh, C W; Hoefer, W; Krajenbrink, F ^[1]

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1. Hughes Research Labs., Malibu, CA (United States)

This paper reports on microstrip passband filters with 3, 6, and 11 poles, as well as microstrip resonators, fabricated using post-annealed Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub x} (YBCO) films deposited on LaAlO{sub 3} substrates using 3-target simultaneous co-sputtering. The insertion loss in the passband for the filters with center frequencies between 9.5 and 13.4 GHz was {le}0.3 dB at 50K and {le}0.6 dB at 77K for the 3 and 6 pole filters, respectively. The out of band rejection was greater than 50 dB. The excellent filter performance was attributed to the use of highly c-axis oriented post-annealed YBCO films. The quality of these films depended strongly on substrate preparation, film thickness, density of YBCO grain boundaries, and crystallographic orientation of the grains. Microstrip ring resonators fabricated with optimized YBCO films had Qs as large as 3800 at 9.5 GHz. The surface resistance and penetration depth for the YBCO films were determined from the temperature dependence of the measured Qs and resonant frequencies of the resonators.

• OSTI ID: 6089666
• Report Number(s): CONF-900944--
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Vol. 27:2; ISSN IEMGA; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
665411 -- Basic Superconductivity Studies-- (1992-)
665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCULATION METHODS
CAVITY RESONATORS
CHALCOGENIDES
CHEMICAL PREPARATION
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
FABRICATION
FILMS
FILTERS
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
PERFORMANCE
PHYSICAL PROPERTIES
RESONATORS
SPUTTERING
SUBSTRATES
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES