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Alignment of cross‐coupled resonator filters using the group delay technique
Author(s) -
Ness John B.
Publication year - 1998
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19980620)18:3<174::aid-mop5>3.0.co;2-c
Subject(s) - resonator , group delay and phase delay , filter (signal processing) , coupling coefficient of resonators , microwave , reflection coefficient , set (abstract data type) , group (periodic table) , physics , reflection (computer programming) , electronic engineering , optics , acoustics , computer science , engineering , electrical engineering , quantum mechanics , programming language
Resonator coupled filters can be designed and tuned in terms of the group delay of the reflection coefficient. This group delay is an effective way to measure the filter parameters and set them to the precise values to generate a specific response. The basic method was outlined previously, but this was restricted to in‐line coupled resonators. In this paper, the method is expanded to include parallel and cross‐coupled resonators, and the effect of finite Q of the resonator is analyzed in more detail. Finally, some comments on the meaning of the group delay measurement and the possibility of a negative delay are discussed. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 18: 174–179, 1998.