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Microwave superconducting filters

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10 Author(s)
Talisa, S.H. ; Westinghouse Sci. & Technol. Center, Pittsburgh, PA, USA ; Janocko, M.A. ; Jones, C.K. ; McAvoy, B.R.
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Four-pole, parallel-coupled microstrip line filters were fabricated using epitaxial YBa2Cu3O7 (YBCO) films deposited by off-axis sputtering on LaAlO3 substrates. Filters were made with and without superconducting ground planes. Because it is not yet possible to grow in-situ epitaxial films on both sides of a substrate, two separate substrates were used, one for the filter and one for the ground-plane. The devices were packaged so that the microstrip-to-ground-plane distance was the thickness of one of the substrates (0.43 mm). Passband characteristics, input power, and temperature dependence were measured, as well as the thermal cycling stability

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )