Superconductor Science and Technology · 2007 · 31 citations · 9 references
EngineeringElectrical EngineeringElectronic MaterialsMicrowave EngineeringWireless CommunicationsImpedance MatchingMicrowave FiltersMillimeter-wave CommunicationsSuperconducting MaterialsSuperconducting Thin FilmsBandwidthBandwidth AnalysisGroup DelayGroup Delay EqualizationLinear Filter DesignMatchingMiniaturized FiltersSuperconducting Filters
A linear phase filter using two cross-coupled quadruplet structures to achieve self-equalization was designed at 2012.5 MHz with 5 MHz bandwidth for a third-generation mobile communications system. This filter was fabricated using double-sided YBCO films on a 2 inch diameter, 0.5 mm thick MgO substrate. In the measurement, it showed good matching in the passband, with reflection better than −15 dB. Moreover, the group delay variation is less than 50 ns over 89% of the filter bandwidth.
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