Abstract
This paper reports a 6-pole high-temperature superconducting (HTS) microstrip bandpass filter for radio astronomy applications. The filter has a center frequency of 23 GHz and a bandwidth the 2 GHz. We have made many efforts, such as adopting 0.25-mm-thick substrate, carefully designing the housing box and filter layout, to solve the problems in realizing a K-band planar filter. A special straight-line half-wavelength resonator (center-widen resonator) was also designed to reduce the insertion loss of the filter. The measured results showed a midband insertion loss of 0.11 dB with a ripple of 0.4 dB, and a return loss better than 11.5 dB. Good agreement was obtained between simulated and measured results.
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Supported by the Knowledge Innovative Program of Chinese Academy of Sciences (Grant No. KJCX2-YW-W16) and National High-Tech Research and Development Program of China (Grant No. 2007AA03Z215)
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Gao, L., Guo, J., Wang, Y. et al. A 23 GHz high-temperature superconducting microstrip filter for radio astronomy. Chin. Sci. Bull. 54, 3485–3488 (2009). https://doi.org/10.1007/s11434-009-0455-1
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DOI: https://doi.org/10.1007/s11434-009-0455-1