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Highly selective bandpass filters using broadside‐coupled coplanar waveguide directional couplers
Author(s) -
SánchezSoriano Miguel Á.,
TorregrosaPenalva Germán,
Bronchalo Enrique,
Coves Ángela
Publication year - 2009
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.24029
Subject(s) - stopband , band pass filter , passband , coplanar waveguide , prototype filter , microwave , elliptic filter , wideband , electronic engineering , electronic filter topology , transition band , band stop filter , filter (signal processing) , materials science , engineering , filter design , electrical engineering , low pass filter , telecommunications
In this work, a new type of wideband coplanar bandpass filter with sharp skirts and large stopband is proposed. The filter exhibits a flat response in the passband, and a steep slope and a high rejection in the stopband. The filter design is based on the use of a broadside‐coupled (BC) coplanar‐waveguide (CPW) directional coupler as a transversal filtering section (TFS). This is performed by conveniently loading two ports of the coupler with shunt stubs, so that the signals in the output port interfere in a way that a bandpass filter response is obtained. The suggested filter scheme has been validated experimentally throughout the design, fabrication, and measurement of a wideband coplanar bandpass filter centered at 2.0 GHz, formed by two TFS connected in cascade. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 294–298, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24029
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