Title :
Novel superconducting ring filter
Author :
Tsuzuki, G. ; Suzuki, M. ; Sakakibara, N. ; Ueno, Y.
Author_Institution :
Adv. Mobile Telecommun. Technol. Inc., Aichi, Japan
Abstract :
A novel planar filter composed of ring resonators with open gaps is proposed. The coupling intensity between the adjacent resonators can be controlled by changing the relative direction of the gaps. Very weak coupling can be obtained so that the narrow bandwidth filter is realized in a compact size. A 5-pole filter at 3 GHz center frequency with 1% bandwidth and an 8-pole filter at 2 GHz with 0.25% bandwidth were demonstrated by using niobium films on 50 mm diameter MgO substrates.
Keywords :
UHF filters; band-pass filters; microwave filters; niobium; passive filters; superconducting microwave devices; superconducting resonators; superconducting thin films; 2 GHz; 3 GHz; 5-pole filter; 50 mm; 8-pole filter; MgO; MgO substrates; Nb films; Nb-MgO; coupling intensity control; narrow bandwidth filter; open gaps; planar filter; ring resonators; superconducting ring filter; Admittance; Bandwidth; Coupling circuits; Frequency; Narrowband; Niobium; Optical ring resonators; Resonator filters; Superconducting films; Superconducting filters;
Conference_Titel :
Microwave Symposium Digest, 1998 IEEE MTT-S International
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-4471-5
DOI :
10.1109/MWSYM.1998.689397
