Open AccessCompact ultra‐wideband bandpass filters with narrow notched bands based on a ring resonator
Author(s) -
Feng Wenjie,
Che Wenquan,
Xue Quan
Publication year - 2013
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2013.0061
Subject(s) - band pass filter , resonator , wideband , ring (chemistry) , split ring resonator , materials science , acoustics , electronic engineering , physics , optoelectronics , engineering , chemistry , organic chemistry
In this study, compact ultra‐wideband (UWB) bandpass filters with single/dual‐notched bands are proposed based on a ring resonator and transversal signal‐interference concept. Broad passband and narrow notched bands with controlled even/odd‐mode resonator frequencies can be adjusted conveniently by changing the characteristic impedance of the ring resonator. Transmission zeros are introduced to improve selectivity and harmonic suppression of the proposed UWB bandpass filters with notched bands. To verify the presented strategies, three prototypes ( ε r = 2.65, h = 0.5 mm) with 3 dB fractional bandwidth >120% are designed and fabricated. Simple structure and good in/out‐of‐band performances can be achieved in the proposed UWB bandpass filters.