Improvement of Filter Properties Using Sapphire and Nickel Rod Trimmers

Fumihiro AITA  Naoto SEKIYA  Satoshi ONO  Atsushi SAITO  Satoru HIRANO  Shigetoshi OHSHIMA  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.2   pp.119-124
Publication Date: 2006/02/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.2.119
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting High-frequency Devices)
HTS filter,  trimming,  IMT-2000,  YBCO thin film,  

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We have examined the improvement of filter properties using sapphire and nickel rod trimmers. We measured the resonance frequency of the hairpin resonator in the filter, and examined the difference between the simulated and measured values. When the measured resonance frequency was lower than the simulated frequency, we used a nickel trimmer to increase the resonance frequency, and when high, a sapphire trimmer to decrease the frequency. Our results showed that the use of sapphire and nickel rod trimmers is effective in improving the frequency response of HTS bandpass filters.