A high temperature superconducting quasi-elliptic notch filter for radioastronomy

A novel miniaturized high temperature superconductor (HTS) four-pole filter for the Radio Frequency Interference Mitigation of the 900 MHz cellular band in radiotelescopes is presented. This circuit incorporates a new type of capacitive cross-coupling between nonadjacent resonators to achieve a quasi-elliptic response. Design procedure along with simulation and experimental results are shown. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 88–90, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.24863

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