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Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals

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Abstract

A matched pair of microstrip spiral superconducting filters with centre frequency 357.5 MHz and 29.4% bandwidth has been developed for radio astronomy. The high coupling coefficients required for the large bandwidth have been achieved through interdigitating the spirals to provide a large interaction length, and by adding loading capacitors on the inner ends of the resonators, together with previously reported features. A low-pass filter has been cascaded with each band-pass filter to mitigate spurious responses. Measurements show 0.09 dB loss, thought to arise mainly from sources outside the filter itself, plus 0.12 dB maximum ripple.

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Acknowledgements

The authors acknowledge the help of Prof. Michael Lancaster of the University of Birmingham and Dr. Alessandro Navarrini of the INAF—Osservatorio Astronomico di Cagliari for making this research project possible.

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Authors and Affiliations

  1. Astronomical Observatory of Cagliari, National Institute for Astrophysics, Loc. Poggio dei Pini, Strada 54, 09012, Capoterra, CA, Italy

    Pietro Bolli

  2. School of EECE, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

    Frederick Huang

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  1. Pietro Bolli
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  2. Frederick Huang
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Correspondence to Pietro Bolli.

Additional information

This work has been supported by the National Institute for Astrophysics (INAF) through TECNO-INAF 2009 and by Region of Sardinia through the research program LR 7/2007.

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Bolli, P., Huang, F. Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals. Exp Astron 33, 225–236 (2012). https://doi.org/10.1007/s10686-012-9289-y

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  • DOI: https://doi.org/10.1007/s10686-012-9289-y

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