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Broadside couplings for high‐selectivity microstrip filters
Author(s) -
Melcón Alejandro Alvarez,
Mosig Juan R.,
Guglielmi Marco
Publication year - 2001
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/mop.1295
Subject(s) - broadside , microstrip , broadband , resonator , microwave , coupling (piping) , frequency selectivity , physics , electronic engineering , topology (electrical circuits) , acoustics , engineering , optoelectronics , optics , telecommunications , electrical engineering , mechanical engineering
Abstract This paper describes a number of broadside‐coupled microstrip structures and their use for the implementation of high‐selectivity multilayered filters. The broadside configuration allows for the introduction of cross couplings between nonadjacent resonators. The cross couplings can then be used to implement transmission zeros that can significantly increase the selectivity of the filters. Furthermore, the investigation shows that the amount of coupling can be considerably increased if the resonators are broadside coupled, thus easily allowing the implementation of broadband filters. Measured results are shown to agree with predictions, thereby fully validating the new structures described. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 295–302, 2001.