Low- and high-temperature superconducting microwave filters |
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Authors: | Talisa SH Janocko MA Moskowitz C Talvacchio J Billing JF Brown R Buck DC Jones CK McAvoy BR Wagner GR Watt DH |
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Institution: | Westinghouse Sci. & Technol. Center, Pittsburgh, PA; |
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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 |
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