Open AccessCompact quadruple‐mode resonator for wideband bandpass filter design
Author(s) -
Lee Ker Chia,
Su Hieng Tiong,
Haldar Manas K.
Publication year - 2014
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.2013.0021
Subject(s) - band pass filter , resonator , wideband , electronic engineering , acoustics , physics , engineering , optics
This study presents the realisation of a wideband bandpass filter using a novel compact quadruple‐mode resonator. The quadruple‐mode resonator, which is evolved from the square open‐loop resonator, is an interesting structure for a compact design. The resonator has two odd and two even mode resonant frequencies whose approximate analytical expressions are derived. For a wide bandwidth filter, three short branch‐lines are introduced to the resonator in order to widen the separation between the resonant frequencies. A filter with a 3 dB fractional bandwidth of 96.0% is demonstrated. Simulated and measured results are in good agreement.