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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.

Authors

Yasir I.A. Al?Yasir

Yuxiang Tu

Mustafa S. Bakr

Abdalfettah S. Asharaa

Widad A. Mshwat

Raed A. Abd?Alhameed

James M. Noras



Abstract

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
DOI https://doi.org/10.1049/iet-map.2018.5863
Public URL http://researchrepository.napier.ac.uk/Output/2840280