Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter

In this article, a new method is developed to design a three-band miniaturized bandpass filter (BPF) that uses two asymmetrically coupled resonators with one step discontinuity and open-circuited uniform impedance resonator (UIR) to achieve Global Interoperability with Microwave Access (WiMAX) and R...

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Autores principales:	Abdul Basit, Muhammad Irfan Khattak, Jamel Nebhen, Atif Jan, Gulzar Ahmad
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/62beb90ce53341e3929880a22711591b
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spelling	oai:doaj.org-article:62beb90ce53341e3929880a22711591b2021-11-04T06:09:18ZInvestigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter1932-6203https://doaj.org/article/62beb90ce53341e3929880a22711591b2021-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8544848/?tool=EBIhttps://doaj.org/toc/1932-6203In this article, a new method is developed to design a three-band miniaturized bandpass filter (BPF) that uses two asymmetrically coupled resonators with one step discontinuity and open-circuited uniform impedance resonator (UIR) to achieve Global Interoperability with Microwave Access (WiMAX) and Radio Frequency Identification (RFID) applications. First, a pair of asymmetrical step impedance resonators (ASIR) is used to implement a dual band filter, then a half wavelength uniform impedance resonator is added below to the transmission line to achieve a triple band response. The proposed filter resonates at frequencies of 3.7 GHz, 6.6 GHz, and 9 GHz with the fractional bandwidth of 7.52%, 5.1%, and 4.44%, respectively. By adjusting the physical length ratio (α) and the impedance ratio (R) of the asymmetric SIR, the proposed fundamental frequencies of the triple BPF are obtained. Moreover, the coupling coefficient (Ke) and external quality factor (Qe) are investigated between the resonators and the input/output ports of the transmission line and are calculated using full-wave EM simulator HFSS. In addition, five transmission zeros are introduced near the passbands to increase the filter selectivity. Finally, the proposed filter is designed and fabricated with a size of 13.69 × 25 mm (0.02 λg × 0.03 λg), where λg represents the guiding wavelength in the first passband. The simulated and measured results have a good correspondence, thus confirming the design concept.Abdul BasitMuhammad Irfan KhattakJamel NebhenAtif JanGulzar AhmadPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Abdul Basit Muhammad Irfan Khattak Jamel Nebhen Atif Jan Gulzar Ahmad Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter
description	In this article, a new method is developed to design a three-band miniaturized bandpass filter (BPF) that uses two asymmetrically coupled resonators with one step discontinuity and open-circuited uniform impedance resonator (UIR) to achieve Global Interoperability with Microwave Access (WiMAX) and Radio Frequency Identification (RFID) applications. First, a pair of asymmetrical step impedance resonators (ASIR) is used to implement a dual band filter, then a half wavelength uniform impedance resonator is added below to the transmission line to achieve a triple band response. The proposed filter resonates at frequencies of 3.7 GHz, 6.6 GHz, and 9 GHz with the fractional bandwidth of 7.52%, 5.1%, and 4.44%, respectively. By adjusting the physical length ratio (α) and the impedance ratio (R) of the asymmetric SIR, the proposed fundamental frequencies of the triple BPF are obtained. Moreover, the coupling coefficient (Ke) and external quality factor (Qe) are investigated between the resonators and the input/output ports of the transmission line and are calculated using full-wave EM simulator HFSS. In addition, five transmission zeros are introduced near the passbands to increase the filter selectivity. Finally, the proposed filter is designed and fabricated with a size of 13.69 × 25 mm (0.02 λg × 0.03 λg), where λg represents the guiding wavelength in the first passband. The simulated and measured results have a good correspondence, thus confirming the design concept.
format	article
author	Abdul Basit Muhammad Irfan Khattak Jamel Nebhen Atif Jan Gulzar Ahmad
author_facet	Abdul Basit Muhammad Irfan Khattak Jamel Nebhen Atif Jan Gulzar Ahmad
author_sort	Abdul Basit
title	Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter
title_short	Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter
title_full	Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter
title_fullStr	Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter
title_full_unstemmed	Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter
title_sort	investigation of external quality factor and coupling coefficient for a novel sir based microstrip tri-band bandpass filter
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/62beb90ce53341e3929880a22711591b
work_keys_str_mv	AT abdulbasit investigationofexternalqualityfactorandcouplingcoefficientforanovelsirbasedmicrostriptribandbandpassfilter AT muhammadirfankhattak investigationofexternalqualityfactorandcouplingcoefficientforanovelsirbasedmicrostriptribandbandpassfilter AT jamelnebhen investigationofexternalqualityfactorandcouplingcoefficientforanovelsirbasedmicrostriptribandbandpassfilter AT atifjan investigationofexternalqualityfactorandcouplingcoefficientforanovelsirbasedmicrostriptribandbandpassfilter AT gulzarahmad investigationofexternalqualityfactorandcouplingcoefficientforanovelsirbasedmicrostriptribandbandpassfilter
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Investigation of external quality factor and coupling coefficient for a novel SIR based microstrip tri-band bandpass filter

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