Automatic Trimming Technique for Superconducting Band-Pass Filters Using a Trimming Library

Shigetoshi OHSHIMA  Takuro KANEKO  Jae-Hun LEE  Maya OSAKA  Satoshi ONO  Atsushi SAITO  

IEICE TRANSACTIONS on Electronics   Vol.E92-C    No.3    pp.302-306
Publication Date: 2009/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E92.C.302
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Section on Recent Progress in Superconducting Analog Devices and Their Applications)
HTS band-pass filter,  automatic tuning,  trimming library microwave device,  

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The superconducting band-pass filter has small insertion loss and excellent out-of-band rejection properties. It has been put to practical use in a number of applications. However, in order to expand its range of application, a tuning technique that can restore the filter characteristics is needed. We propose an automatic tuning system using a trimming library and checked the feasibility of the system by tuning a forward-coupled filter with three resonators. The results show that the trimming library method is an effective way of automatically improving the filter characteristics.