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.

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.

Citation

Al‐Yasir, Y. I., Tu, Y., Bakr, M. S., Parchin, N. O., Asharaa, A. S., Mshwat, W. A., Abd‐Alhameed, R. A., & Noras, J. M. (2019). Design of multi‐standard single/tri/quint‐wideband asymmetric stepped‐impedance resonator filters with adjustable TZs. IET microwaves, antennas & propagation, 13(10), 1637-1645. https://doi.org/10.1049/iet-map.2018.5863

• 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