Open AccessDesign of multi‐standard single/tri/quint‐wideband asymmetric stepped‐impedance resonator filters with adjustable TZs
Author(s) -
AlYasir Yasir I.A.,
Tu Yuxiang,
Bakr Mustafa S.,
Parchin Naser Ojaroudi,
Asharaa Abdalfettah S.,
Mshwat Widad A.,
AbdAlhameed Raed A.,
Noras James M.
Publication year - 2019
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.2018.5863
Subject(s) - wideband , resonator , electrical impedance , materials science , electronic engineering , acoustics , physics , optoelectronics , engineering , quantum mechanics
This study presents an original asymmetric stepped‐impedance resonator filter combined with meander coupled‐line structures and enabling the realisation of finite transmission zeros (TZs) and the implementation of multi‐band bandpass filters. The meander coupled sections (MCSs) tune the TZs and resonant frequencies: with higher‐order spurious frequencies cancelled by the TZs, a single wideband with wide stopband from 1.18 to 1.84 GHz is possible. Furthermore, by positioning the finite TZs between the high‐order spurious frequencies and adjusting the coupling strength between resonators, a quint‐wideband filter can be realised, with centre frequencies of 1.19, 4.29, 5.43, 6.97, 9.9 GHz and fractional bandwidths of 31.9, 15.4, 15.8, 4.3, 39.2%, respectively. More importantly, two filters with single/quad‐wideband performance can be realised by tuning the parameters of the MCS, and therefore they can be designed separately by using only one original structure. The triple‐wideband filter is realised with the help of the asymmetric parallel uncoupled microstrip section. These filter structures enjoy the advantage of single/multi‐band versatility, structure reusability and simplicity. The good in‐band and out‐of‐band performance, low loss and simple structure of the proposed single/tri/quint‐wideband filters make them very promising for applications in future multi‐standard wireless communication.