Performance of a narrow band microwave filter implemented in thin-film YBa sub 2 Cu sub 3 O sub 7 minus. delta. with ohmic contacts

Journal Article · Mon Feb 04 00:00:00 EST 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104579· OSTI ID:6112429

Kalokitis, D; Fathy, A; Pendrick, V; Belohoubek, E ^[1]; Findikoglu, A; Inam, A; Xi, X X; Venkatesan, T ^[2]; Barner, J B ^[3]

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1. David Sarnoff Research Center, Princeton, New Jersey 08543 (USa)
2. Rutgers University, Piscataway, NJ (USA)
3. Bellcore, Red Bank, NJ (USA)

Using {ital in} {ital situ} deposited thin-film Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} on LaAlO{sub 3} substrates, we have developed a pseudo-interdigital three-pole stripline filter with a minimum passband loss under 3.5 dB at 9.5 GHz and 77 K. The passband is very narrow, having a bandwidth of only 50 MHz (0.5%). The filter occupies a volume of less than 0.1 cm{sup 3}. An equivalent copper filter produced a loss of 18.5 and 28 dB at 77 and 300 K, respectively. The input and output coupling is achieved by {ital ex} {ital situ} sputtered Au thin-film contacts defined on the Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} by a lift-off technology and ultrasonically bonded to hermetic K connectors. Some of the major concerns in the realization of narrow band filters such as air gaps between high dielectric constant substrates and uniformity of the substrate's dielectric constant are addressed.

• OSTI ID: 6112429
• Journal Information: Applied Physics Letters; (USA), Vol. 58:5; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC FILTERS
DESIGN
MICROWAVE EQUIPMENT
SUPERCONDUCTING FILMS
ELECTRICAL PROPERTIES
BARIUM OXIDES
COPPER OXIDES
ELECTRONIC CIRCUITS
HIGH-TC SUPERCONDUCTORS
OPTICAL PROPERTIES
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRONIC EQUIPMENT
EQUIPMENT
FILMS
FILTERS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
426001* - Engineering- Superconducting Devices & Circuits- (1990-)