Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals

Details Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012exa....33..225b&link_type=abstract

Experimental Astronomy, Volume 33, Issue 1, pp.225-236

Astronomy and Astrophysics

Astronomy

Astronomy Receiver Design, Computer-Aided Design, High-Tc Superconducting Thin-Film Filters, Microwave Filters

Scientific paper

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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