Design and Diagnosis of a 5 GHz 10-Pole HTS Bandpass Filter Using CPW Quarter-Wavelength Resonators

Zhewang MA  Hideyuki SUZUKI  Yoshio KOBAYASHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.2   pp.144-149
Publication Date: 2003/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: Passive (Filter)
Keyword: 
superconductor,  coplanar waveguide (CPW),  quarter-wavelength resonator,  bandpass filter,  

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Summary: 
A high temperature superconductor (HTS) 5 GHz 10-pole bandpass filter (BPF) is designed by using coplanar waveguide (CPW) quarter-wavelength resonators. The 10-pole Chebyshev BPF has a center frequency 5.0 GHz and a fractional bandwidth 3.2%. Based on an equivalent circuit with J- and K-inverters, the filter is first designed by using an EM simulator. Next an optimization algorithm is employed to diagnose the discrepancy between the filter responses calculated by the EM simulator and the equivalent circuit. Adjustment of the dimensions of the filter is made thereby. The frequency response of the adjusted filter satisfies well the design specifications.