HTS Narrow Band Filters at UHF Band for Radio Astronomy Applications

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Abstract

High performance narrow-band High-Temperature Superconductor (HTS) filters at 610 MHz with very sharp cut-off response and low loss are needed for improving the observation of pulsars at the Jodrell Bank Observatory, UK. An eight-pole quasi-elliptic HTS filter using compact resonators has been designed for this purpose. The measured response of filter has an insertion loss of 0.3 dB (including a 0.2 dB ripple), and a return loss of 15 dB in the passband. Two transmission zeroes are realized to improve the steepness of the cut-off. The lowest harmonic is designed to appear at 1.79 GHz, about three times the center frequency. The out-of-band rejection is better than 85 dB up to this harmonic. The filter has been tested in the observatory with excellent results.

Details

Original languageEnglish
Pages (from-to)1004-1007
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume15
Issue number2
Publication statusPublished - 1 Jun 2005

Keywords

  • high-temperature superconductors, microwave filters, superconducting filters, astronomy