High-Temperature Superconducting CPW Bandpass Filters Using Meander-Line Parallel-Circuited Resonators

Atsushi SANADA  Takahiro HAMAMURA  Ikuo AWAI  

IEICE TRANSACTIONS on Electronics   Vol.E86-C    No.8    pp.1729-1736
Publication Date: 2003/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
high-temperature superconductor,  bandpass filter,  coplanar waveguide (CPW),  meander-line,  metalorganic deposition,  

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A compact high-temperature superconducting (HTS) bandpass filter (BPF) using coplanar waveguide (CPW) meander-line parallel-circuited resonators is proposed for microwave receiver applications. The design theory is presented based on a conventional filter theory with J-inverters. Also, analytical and numerical studies of the meander-line resonator are carried out in terms of equivalent circuit values, the resonant frequency, and the unloaded Q. Two- and four-stage 0.05 dB ripple Chebyshev BPFs at 2 GHz with relative bandwidth 60 MHz are fabricated with the metalorganic deposition (MOD)-derived YBCO films on LaAlO3 substrates and their performance are demonstrated. The measured frequency characteristics and the unloaded quality factors agree well with the theoretical and numerical results and the validity of the design theory is confirmed.