Title :
A superconducting thin film filter of very high wide-band rejection
Author :
Yi, H.R. ; Remillard, S.K. ; Abdelmonem, A.
Author_Institution :
ISCO Int., Mount Prospect, IL, USA
Abstract :
The wide band rejection of superconducting thin film filters is investigated. The cross talk between input and output ports for thin film filters degrades the wide band rejection. We present a thin film filter design based on a newly invented thin film resonator. The cross coupling between the input and output ports is reduced by a factor of more than ten. The fabricated thin film filter shows good performance and consistency with design and theory. The measured return loss in the passband is more than 23 dB. The insertion loss is 0.66 dB corresponding to a filter Q of 36,000. Steep rejection slopes at the band edges are obtained. The wide band rejection is 95 dB.
Keywords :
Q-factor; band-stop filters; crosstalk; high-temperature superconductors; resonator filters; superconducting filters; superconducting microwave devices; superconducting thin films; 0.66 dB; 23 dB; 843 MHz; MgO; MgO substrate; cross coupling; cross talk; filter Q; input ports; insertion loss; low microwave loss; output ports; return loss; steep rejection slopes; superconducting thin film filter; thin film resonator; very high wide-band rejection; Band pass filters; Degradation; Filtering theory; Loss measurement; Passband; Resonator filters; Superconducting filters; Superconducting thin films; Transistors; Wideband;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210527
