IEEE Transactions on Microwave Theory and Techniques · 2000 · 86 citations · 5 references
EngineeringElectrical EngineeringMaterials ScienceElectronic MaterialsMicroelectronicsMicrowave EngineeringDielectricsMicrostrip CircuitsMicrowave FiltersMicrowave Transmission LinesSuperconducting MaterialsSuperconducting Thin FilmsFilter DesignMicrostrip Bandpass FiltersMicrostrip Bandstop FiltersMicrostrip FiltersMicrowave Filter DesignSelectivitySuperconducting FiltersSuperconducting Resonators
In this paper, a new design of microstrip-line superconducting filters for IMT-2000 band application is presented. The design features high selectivity by means of creating transmission zeros and using many resonators. As a demonstration, 16- and 32-pole filters were fabricated using YBCO films on a half-area and on the full area of 3-in-diameter MgO wafers, respectively. Excellent attenuation of more than 30 dB, 420 kHz from the lower band edge, and 400 kHz from the upper band edge for the 32-pole filter was achieved. The filters were tuned not with mechanical tuning screws, but with a dielectric film. The tuning was carried out based on a novel method of measurement. These techniques are also described.
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Direct synthesis of cascaded quadruplet (CQ) filters
R. Levy · 2002 · 30 citations
Engineering, Computer Engineering, Interconnection Networks +10