Open AccessA NOVEL WIDE-STOPBAND BANDSTOP FILTER WITH SHARP-REJECTION CHARACTERISTIC AND ANALYTICAL THEORY
Author(s) -
Liming Liang,
Yuanan Liu,
Jiuchao Li,
Shulan Li,
Cuiping Yu,
Yongle Wu,
Ming Su
Publication year - 2013
Publication title -
progress in electromagnetics research c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 34
ISSN - 1937-8718
DOI - 10.2528/pierc13050114
Subject(s) - stopband , band stop filter , control theory (sociology) , materials science , filter (signal processing) , physics , computer science , low pass filter , optoelectronics , artificial intelligence , resonator , control (management) , computer vision
A novel bandstop fllter with wide-stopband performance is proposed and discussed in this paper. This circuit conflguration includes two-section coupled lines and three open-circuit transmission- line stubs. Due to the symmetry of this proposed structure, closed-form equations for scattering parameters are investigated. Transmission zeros and poles location for difierent circuit parameters are discussed, and the corresponding design curves are given. In order to verify this new fllter circuit structure and its corresponding design theory, several typical numerical examples are designed, calculated and illustrated. Furthermore, a practical wideband bandstop fllter with i20dB fractional bandwidth of 94% centered at 3GHz with sharp rejection characteristics is fabricated to validate the theoretical prediction. The measured frequency response of the fllter agrees excellently with the predicted result.
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