Open AccessQuasi‐lumped bandpass filter with sharp transition edge and wide stopband rejection
Author(s) -
Huang H.H.,
Chen C.H.,
Horng T.S.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2012.4485
Subject(s) - stopband , passband , transition band , band pass filter , resonator , elliptic filter , bandwidth (computing) , prototype filter , chebyshev filter , electronic engineering , physics , topology (electrical circuits) , control theory (sociology) , low pass filter , computer science , optoelectronics , optics , engineering , telecommunications , electrical engineering , control (management) , artificial intelligence
Presented is a highly miniaturised bandpass filter (BPF) with superior passband selectivity and high rejection over a wide stopband for 2.4 GHz WLAN applications. The proposed third‐order coupled resonator design with a cross‐coupled path provides an attenuation pole that is very close to the passband. Properly setting the fractional bandwidth and the resonator Q factor yields a sharp transition edge to suppress a 2.1 GHz WCDMA signal. Furthermore, the use of quasi‐lumped LC resonators reduces the area of the BPF and generates multiple transmission zeros to enhance the desired stopband rejection.