Narrow-Band 2 GHz Superconducting Filter

Genichi TSUZUKI  Masanobu SUZUKI  Nobuyoshi SAKAKIBARA  Yoshiki UENO  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.7   pp.1177-1181
Publication Date: 1999/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: Passive Devices and Circuits
high temperature superconducting filter,  narrow bandwidth,  ring resonator,  coupling coefficient,  

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We propose a novel planar filter design for narrow-band applications. The filter consists of half-wavelength ring resonators with open gaps. This design has three advantages over conventional planar designs: a smaller size despite narrow bandwidth, a sharper skirt response at the passband edge without notch, an excellent out-band attenuation. We demonstrated these advantages by fabricating an 8-poles filter centered at 1.95 GHz with a 5 MHz bandwidth using YBCO films on a 2 inch diameter MgO substrate.