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Microstrip band-pass filters for the frequency range of 1.8 GHz were manufactured using double-sided YBa2Cu3O7−δ (YBCO) films on CeO2-buffered 2-in. sapphire wafers. Their S-parameters were measured. To protect YBCO films against degradation in air, they were coated with gold. Microwave surface resistance Rs(T) was measured by the copper end-plate and microstrip resonator techniques. The Au coating...
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