Title :
A low-loss 5GHz bandpass filter using HTS coplanar waveguide quarter-wavelength resonators
Author :
Zhewang Ma ; Suzuki, H. ; Kobayashi, Y. ; Satoh, K. ; Narahashi, S. ; Nojima, T.
Author_Institution :
Dept. of Electr. & Electron. Syst., Saitama Univ., Japan
Abstract :
A novel low-loss high temperature superconductor (HTS) filter is proposed by using coplanar waveguide quarter-wavelength resonators. A 4-pole Chebyshev bandpass filter with a center frequency 5.0GHz and a 0.01dB-ripple fractional bandwidth 3.2% is designed and fabricated using a YBCO film deposited on a MgO substrate. The frequency response of the filter measured at 60K agrees very well with the theoretical prediction. The measured insertion loss is 0.22dB, the lowest reported so far for HTS coplanar waveguide filters.
Keywords :
band-pass filters; barium compounds; coplanar waveguide components; frequency response; high-temperature superconductors; losses; superconducting microwave devices; yttrium compounds; 0.22 dB; 5 GHz; 60 K; Chebyshev filter; HTS coplanar waveguide; MgO; YBCO; YBaCuO-MgO; center frequency; fractional bandwidth; frequency response; high temperature superconductor; insertion loss; low-loss bandpass filter; quarter-wavelength resonators; Band pass filters; Bandwidth; Chebyshev approximation; Coplanar waveguides; Frequency; High temperature superconductors; Resonator filters; Superconducting films; Superconducting filters; Yttrium barium copper oxide;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1012251
