Title :
HTS microstrip filters using H-type resonators
Author :
Chung, Dong-Chul ; Han, Byoung-Sung
Author_Institution :
Div. of Inf., Commun. & Comput. Eng., Woosuk Univ., Chonbuk, South Korea
fDate :
3/1/2001 12:00:00 AM
Abstract :
We report the characteristics of a high-Tc superconductor (HTS) bandpass filter with the designed center frequency of 16.5 GHz. A YBa2Cu3O7-x (YBCO) superconducting thin film was prepared using the rf-magnetron sputtering deposition technique. The filter used in this work was composed of the “H”-type resonator (non-uniform microstrip lines). This approach has advantages for a considerably high Q-value and the compact filter structure. The impedance ratio of the “H”-type resonator was 0.5 in this work. In the measured responses, this HTS filter showed the insertion loss of -0.4 dB at maximum. The measured center frequency of our HTS bandpass filter was 16.44 GHz and the passband was from 15.91 GHz to 16.97 GHz, a bandwidth of 6.86% with 3 dB in band Chebyshev ripple. Experimental results of our filters were reported in terms of insertion loss, return loss and other various characteristics
Keywords :
Q-factor; band-pass filters; barium compounds; high-temperature superconductors; microstrip filters; microstrip resonators; resonator filters; sputtered coatings; superconducting filters; superconducting resonators; superconducting thin films; yttrium compounds; -0.4 dB; 15.91 to 16.97 GHz; 16.5 GHz; Chebyshev ripple; H-type resonator; Q-factor; RF magnetron sputtering; YBCO thin film; YBa2Cu3O7; bandpass filter; center frequency; high-Tc superconductor; impedance ratio; insertion loss; microstrip filter; return loss; Band pass filters; Frequency; High temperature superconductors; Insertion loss; Microstrip filters; Microstrip resonators; Resonator filters; Superconducting filters; Superconducting thin films; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
