Design of a Miniaturized Superconducting Bandpass Filter by Evaluating the Kinetic Inductance in the K-Inverter

Haruichi KANAYA   Koji KAWAKAMI   Keiji YOSHIDA   

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.2   pp.145-150
Publication Date: 2006/02/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting High-frequency Devices)
HTS passive device ,  bandpass filter ,  quarter-wavelength resonator ,  meander line ,  coplanar waveguide ,  

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We propose a design theory of the miniaturized high temperature superconducting (HTS) coplanar waveguide (CPW) bandpass filter (BPF), which is composed of meanderline quarter-wavelength resonator, J- and K-inverters. The J- and K-inverters are realized by using interdigital gap and meander-shape inductor. To evaluate the kinetic inductance of the K-inverter, we fabricate the YBCO resonator connected with K-inverters and redesigned the YBCO filter parameters. Finally, we designed and fabricated the YBCO CPW quarter-wavelength resonator BPF by taking account of the kinetic inductance of the K-inverter. The experimental results are in agreement with the design parameters.