Title :
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
fDate :
9/1/1991 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
