Low- and high-temperature superconducting microwave filters

Author

Talisa, Salvador H. ; Janocko, Michael A. ; Moskowitz, Charles ; Talvacchio, John ; Billing, J.F. ; Brown, R. ; Buck, Daniel C. ; Jones, C.K. ; McAvoy, Bruce R. ; Wagner, George R. ; Watt, D.H.

Author_Institution

Westinghouse Sci. & Technol. Center, Pittsburgh, PA, USA

Volume

39

Issue

9

fYear

1991

fDate

9/1/1991 12:00:00 AM

Firstpage

1448

Lastpage

1454

Abstract

Stripline and microstrip filters at X-band were designed and fabricated using low- and high-temperature superconductors in quarter-wave, parallel-coupled section configurations. Low-temperature superconducting niobium thin films, deposited on single-crystal sapphire, were used to build to six-pole stripline filters with adjacent passbands and approximately 3 dB crossovers and 1.2% bandwidth. Four- and six-pole microstrip filters were made with in situ epitaxial YBa₂Cu₃O₇ (YBCO) films on LaAlO₃ substrates. All the YBCO filters showed 77 K passbands with clean skirts and high out-of-band rejection. The six-pole filters had adjacent passbands with -28 dB crossovers and 1.5% bandwidth

Keywords

band-pass filters; barium compounds; high-temperature superconductors; microwave filters; niobium; passive filters; strip line components; superconducting devices; superconducting epitaxial layers; yttrium compounds; 77 K; Al₂O₃; LaAlO₃; Nb films; X-band; YBa₂Cu₃O₇; coupled quarter wave sections; four-pole filters; high-temperature superconductors; low temperature superconductors; microstrip filters; parallel-coupled section configurations; six-pole filters; stripline filters; Band pass filters; Bandwidth; High temperature superconductors; Microstrip filters; Microwave filters; Passband; Stripline; Superconducting epitaxial layers; Superconducting filters; Superconducting microwave devices;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.83816

Filename

83816