Open AccessMiniaturised wideband bandpass filter based on harmonic suppressed dual transmission lines
Author(s) -
Zhang Bo,
Wu Yongle,
Yu Cuiping,
Liu Yuanan
Publication year - 2016
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.2016.0361
Subject(s) - stopband , wideband , band pass filter , bandwidth (computing) , harmonic , fractional bandwidth , electronic engineering , transmission (telecommunications) , materials science , physics , computer science , acoustics , engineering , telecommunications
A novel miniaturised wideband bandpass filter (BPF) based on harmonic suppressed dual transmission lines (DTLs) is introduced with enhanced upper stopband rejection and passaband selectivity. The transmission and harmonic suppression characteristics of series and parallel connected DTLs are analysed adopting even–odd mode method. To verify the proposed structure, a high selective wideband BPF centred at 1.86 GHz with a fractional bandwidth of 93.5% is designed and fabricated. The upper stopband is extended up to 8.8 GHz (4.7 f 0 ) with the suppression level of above 35 dB. Furthermore, a size reduction of 30% can be achieved in proposed BPF, compared with conventional wideband BPF based on quarter‐wavelength transmission lines.