Compact wide-stopband dual-band balanced filter using an electromagnetically coupled sir pair with controllable transmission zeros and bandwidths

Tang, J; Liu, H; Yang, Y

Compact wide-stopband dual-band balanced filter using an electromagnetically coupled sir pair with controllable transmission zeros and bandwidths

Tang, J Liu, H Yang, Y

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Publisher:: Institute of Electrical and Electronics Engineers (IEEE)
Publication Type:: Journal Article
Citation:: IEEE Transactions on Circuits and Systems II: Express Briefs, 2020, 67, (11), pp. 2357-2361
Issue Date:: 2020-11-01

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Field	Value	Language
dc.contributor.author	Tang, J
dc.contributor.author	Liu, H
dc.contributor.author	Yang, Y https://orcid.org/0000-0001-7439-2156
dc.date.accessioned	2021-02-22T08:06:02Z
dc.date.available	2021-02-22T08:06:02Z
dc.date.issued	2020-11-01
dc.identifier.citation	IEEE Transactions on Circuits and Systems II: Express Briefs, 2020, 67, (11), pp. 2357-2361
dc.identifier.issn	1549-7747
dc.identifier.issn	1558-3791
dc.identifier.uri	http://hdl.handle.net/10453/146283
dc.description.abstract	© 2004-2012 IEEE. This brief presents a dual-band balanced filter with wide stopband, controllable transmission zeros and bandwidths, and compact size based on a newly designed electromagnetically coupled stepped impedance resonator (SIR) pair. The proposed SIR contains three different impedance lines, which can lead to more degrees of design freedom for resonant frequency control. Two electrical length ratios of the SIR can be individually tuned to obtain two desired differential-mode (DM) resonant frequencies for dual-band design, while keeping the first spurious frequency far away for wide-stopband design. Moreover, an inherent common-mode (CM) suppression can also be obtained without adding extra structures due to the discriminating CM resonant frequencies. The mechanism of transmission zeros (TZs) generation is also investigated by means of phases and admittance analysis. It reveals that four TZs around the two operating bands can be flexibly controlled via adjusting the ratio of magnetic and electric coupling coefficients of the SIR pair as well as the coupling space of the feeding lines, which have greatly enhanced the passband selectivities and the band-to-band isolation. Subsequently, the graphs of coupling coefficients and external quality factors for the filter design are extracted, showing sufficient degrees of design freedom for bandwidth control. The proposed dual-band balanced filter is finally fabricated and measured at 1.75 GHz and 3.64 GHz, respectively. Measured results are in good agreement with the simulated ones. Compared with the state-of-the-art works, the proposed circuit performs a deeper and wider stopband of 4.5{f}{1}{d} with 40dB attenuation (where {f}{1}{d} is the fundamental frequency), and more than 50-/45-dB in-band CM suppressions with compact size ( 0.14\lambda {g} \times 0.27{\lambda }{g} , where {\lambda }{g} is the guided wavelength of the fundamental frequency).
dc.language	en
dc.publisher	Institute of Electrical and Electronics Engineers (IEEE)
dc.relation.ispartof	IEEE Transactions on Circuits and Systems II: Express Briefs
dc.relation.isbasedon	10.1109/TCSII.2020.2968922
dc.rights	© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.	en_US
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0906 Electrical and Electronic Engineering
dc.subject.classification	Electrical & Electronic Engineering
dc.title	Compact wide-stopband dual-band balanced filter using an electromagnetically coupled sir pair with controllable transmission zeros and bandwidths
dc.type	Journal Article
utslib.citation.volume	67
utslib.for	0906 Electrical and Electronic Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-02-22T08:05:50Z
pubs.issue	11
pubs.publication-status	Published
pubs.volume	67
utslib.citation.issue	11

Abstract:

© 2004-2012 IEEE. This brief presents a dual-band balanced filter with wide stopband, controllable transmission zeros and bandwidths, and compact size based on a newly designed electromagnetically coupled stepped impedance resonator (SIR) pair. The proposed SIR contains three different impedance lines, which can lead to more degrees of design freedom for resonant frequency control. Two electrical length ratios of the SIR can be individually tuned to obtain two desired differential-mode (DM) resonant frequencies for dual-band design, while keeping the first spurious frequency far away for wide-stopband design. Moreover, an inherent common-mode (CM) suppression can also be obtained without adding extra structures due to the discriminating CM resonant frequencies. The mechanism of transmission zeros (TZs) generation is also investigated by means of phases and admittance analysis. It reveals that four TZs around the two operating bands can be flexibly controlled via adjusting the ratio of magnetic and electric coupling coefficients of the SIR pair as well as the coupling space of the feeding lines, which have greatly enhanced the passband selectivities and the band-to-band isolation. Subsequently, the graphs of coupling coefficients and external quality factors for the filter design are extracted, showing sufficient degrees of design freedom for bandwidth control. The proposed dual-band balanced filter is finally fabricated and measured at 1.75 GHz and 3.64 GHz, respectively. Measured results are in good agreement with the simulated ones. Compared with the state-of-the-art works, the proposed circuit performs a deeper and wider stopband of 4.5{f}{1}{d} with 40dB attenuation (where {f}{1}{d} is the fundamental frequency), and more than 50-/45-dB in-band CM suppressions with compact size ( 0.14\lambda {g} \times 0.27{\lambda }{g} , where {\lambda }{g} is the guided wavelength of the fundamental frequency).

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