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Design of multi‐standard single/tri/quint‐wideband asymmetric stepped‐impedance resonator filters with adjustable TZs

Al?Yasir, Yasir I.A.; Tu, Yuxiang; Bakr, Mustafa S.; Parchin, Naser Ojaroudi; Asharaa, Abdalfettah S.; Mshwat, Widad A.; Abd?Alhameed, Raed A.; Noras, James M.


Yasir I.A. Al?Yasir

Yuxiang Tu

Mustafa S. Bakr

Abdalfettah S. Asharaa

Widad A. Mshwat

Raed A. Abd?Alhameed

James M. Noras


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.

Journal Article Type Article
Acceptance Date May 1, 2019
Online Publication Date Jun 4, 2019
Publication Date 2019-08
Deposit Date Feb 21, 2022
Journal IET Microwaves, Antennas & Propagation
Print ISSN 1751-8725
Electronic ISSN 1751-8733
Publisher Institution of Engineering and Technology (IET)
Peer Reviewed Peer Reviewed
Volume 13
Issue 10
Pages 1637-1645
Public URL