Title :
A Miniaturized High Temperature Superconducting Bandpass Filter Using CPW Quarter-Wavelength Spiral Resonators
Author :
Ma, Zhewang ; Kawaguchi, Tamio ; Kobayashi, Yoshio ; Koizumi, Daisuke ; Satoh, Kei ; Narahashi, Shoichi
Author_Institution :
Dept. of Electr. & Electron. Syst., Saitama Univ.
Abstract :
A novel compact high temperature superconducting BPF is developed by using coplanar waveguide quarter-wavelength spiral resonators. The filter is a 5-pole Chebyshev BPF with a midband frequency of 5.0GHz and an equal-ripple fractional bandwidth of 3.2%. The CPW spiral resonator is made as small as 1.02times2.1mm2. As a result, the 5-pole filter occupies an area of only 7.65x2.11mm2, less than one-third that of a newly reported CPW interdigital filter. The filter is fabricated by using 0.5mum YBCO film deposited on an MgO substrate. No bond-wire air-bridges are used and no post-tuning is made in the experiment. The measured filtering characteristics agree well with EM simulations and show low passband insertion losses in spite of the small size of the filter
Keywords :
Chebyshev filters; band-pass filters; barium compounds; coplanar waveguide components; high-temperature superconductors; resonator filters; superconducting filters; yttrium compounds; 0.5 micron; 5 GHz; CPW interdigital filter; CPW spiral resonator; Chebyshev band-pass filter; YBa2Cu3O; coplanar waveguide spiral resonator; high temperature superconducting bandpass filter; quarter-wavelength spiral resonator; Band pass filters; Bandwidth; Chebyshev approximation; Coplanar waveguides; Frequency; High temperature superconductors; Resonator filters; Spirals; Superconducting filters; Yttrium barium copper oxide; High temperature superconductor; bandpass filter; coplanar waveguide; interdigital filter; spiral resonator;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249424
