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A Novel Compact HTS Interdigital Bandpass Filter Using CPW Quarter-Wavelength Resonators
Zhewang MA Tamio KAWAGUCHI Yoshio KOBAYASHI Daisuke KOIZUMI Kei SATOH Shoichi NARAHASHI
IEICE TRANSACTIONS on Electronics
Publication Date: 2006/02/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting High-frequency Devices)
high temperature superconductor, coplanar waveguide, bandpass filter,
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A novel high temperature superconducting interdigital bandpass filter is proposed by using coplanar waveguide quarter-wavelength resonators. The CPW resonators are arranged in parallel, and consequently the filter becomes very compact. The filter is a 5-pole Chebyshev BPF with a midband frequency of 5.0 GHz and an equal-ripple fractional bandwidth of 3.2%. It is fabricated using a YBCO film deposited on an MgO substrate. The measured filtering characteristics agree well with EM simulations and show a low insertion loss in spite of the small size of the filter.