Open AccessCompact quad‐band bandpass filter based on sextuple‐mode stepped impedance stub‐loaded resonator
Author(s) -
Chen Jianzhong,
Shen Jie,
Gao Ni,
Zhang Anxue
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2015.2541
Subject(s) - passband , stub (electronics) , band pass filter , resonator , electrical impedance , electronic engineering , acoustics , physics , materials science , optics , engineering , electrical engineering
A novel compact quad‐band bandpass filter (BPF) with multi‐transmission zeros is proposed. This filter utilises a sextuple‐mode impedance resonator to achieve three passbands, and the fourth passband composes of single‐end short‐circuited resonators. Adopting an embedded and folded structure is employed to realise miniaturisation. Stub–stub coupling is introduced to produce transmission zeros, which can improve the passband selectivity. Finally, a quad‐band BPF centring at 0.9/1.45/2.45/3.5 GHz is designed, fabricated and measured. The measured results have good agreement with the simulated ones.