An Ultrawideband Frequency-Reconfigurable Tightly Coupled Dipole Array with Wide Beam-Scanning Capability

He, Y; Wei, G; Ziolkowski, RW; Jay Guo, Y

An Ultrawideband Frequency-Reconfigurable Tightly Coupled Dipole Array with Wide Beam-Scanning Capability

He, Y Wei, G Ziolkowski, RW Jay Guo, Y

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Publisher:: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Publication Type:: Journal Article
Citation:: IEEE Transactions on Antennas and Propagation, 2024, 72, (11), pp. 8488-8500
Issue Date:: 2024-01-01

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Field	Value	Language
dc.contributor.author	He, Y
dc.contributor.author	Wei, G
dc.contributor.author	Ziolkowski, RW
dc.contributor.author	Jay Guo, Y
dc.date.accessioned	2025-01-03T02:10:58Z
dc.date.available	2025-01-03T02:10:58Z
dc.date.issued	2024-01-01
dc.identifier.citation	IEEE Transactions on Antennas and Propagation, 2024, 72, (11), pp. 8488-8500
dc.identifier.issn	0018-926X
dc.identifier.issn	1558-2221
dc.identifier.uri	http://hdl.handle.net/10453/182889
dc.description.abstract	An innovative ultrawideband (UWB) frequency-reconfigurable tightly coupled dipole array (FR-TCDA) is presented. The design realizes high radiation efficiency and wide beam-scan angles with its custom-designed reconfigurable layer and wide-angle impedance matching (WAIM) structure. The reconfigurable layer is p-i-n-diode based; it functions as a phase-shifting structure that transforms an undesirable out-of-phase ground-plane reflection into a desirable in-phase one with low insertion losses in each of its two contiguous bands. The WAIM element is obtained by integrating dual-level, double-sided capacitively loaded loops (DLDS-CLLs) in a co-planar configuration with the dipoles and leads to enhanced beam-scanning performance. Each array unit cell is fed by a Klopfenstein tapered balun that incorporates a capacitance-loaded shorting pin, leading to a feeding scheme free from common-mode resonances across the entire working bandwidth. A 14×14 prototype was fabricated and tested; the measured results confirm the simulated performance characteristics. The developed array's two frequency-reconfigurable states cover 0.37-0.93 GHz and 0.85-5.85 GHz at broadside with a VSWR <3 and a radiation efficiency greater than 95%. These two contiguous operating bands combine to effectuate an overall bandwidth of 15.8:1 (0.37-5.85 GHz). When scanning up to {±70°, ± 70°,± 50°} in the {E, D, H} planes, they achieve a combined bandwidth of 13.7:1 (0.42-5.77 GHz).
dc.language	English
dc.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
dc.relation.ispartof	IEEE Transactions on Antennas and Propagation
dc.relation.isbasedon	10.1109/TAP.2024.3454813
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0906 Electrical and Electronic Engineering, 1005 Communications Technologies
dc.subject.classification	Networking & Telecommunications
dc.subject.classification	4006 Communications engineering
dc.subject.classification	4008 Electrical engineering
dc.subject.classification	4009 Electronics, sensors and digital hardware
dc.title	An Ultrawideband Frequency-Reconfigurable Tightly Coupled Dipole Array with Wide Beam-Scanning Capability
dc.type	Journal Article
utslib.citation.volume	72
utslib.for	0906 Electrical and Electronic Engineering
utslib.for	1005 Communications Technologies
pubs.organisational-group	University of Technology Sydney
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/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Global Big Data Technologies Centre (GBDTC)
utslib.copyright.status	closed_access	*
dc.date.updated	2025-01-03T02:10:53Z
pubs.issue	11
pubs.publication-status	Published
pubs.volume	72
utslib.citation.issue	11

Abstract:

An innovative ultrawideband (UWB) frequency-reconfigurable tightly coupled dipole array (FR-TCDA) is presented. The design realizes high radiation efficiency and wide beam-scan angles with its custom-designed reconfigurable layer and wide-angle impedance matching (WAIM) structure. The reconfigurable layer is p-i-n-diode based; it functions as a phase-shifting structure that transforms an undesirable out-of-phase ground-plane reflection into a desirable in-phase one with low insertion losses in each of its two contiguous bands. The WAIM element is obtained by integrating dual-level, double-sided capacitively loaded loops (DLDS-CLLs) in a co-planar configuration with the dipoles and leads to enhanced beam-scanning performance. Each array unit cell is fed by a Klopfenstein tapered balun that incorporates a capacitance-loaded shorting pin, leading to a feeding scheme free from common-mode resonances across the entire working bandwidth. A 14×14 prototype was fabricated and tested; the measured results confirm the simulated performance characteristics. The developed array's two frequency-reconfigurable states cover 0.37-0.93 GHz and 0.85-5.85 GHz at broadside with a VSWR <3 and a radiation efficiency greater than 95%. These two contiguous operating bands combine to effectuate an overall bandwidth of 15.8:1 (0.37-5.85 GHz). When scanning up to {±70°, ± 70°,± 50°} in the {E, D, H} planes, they achieve a combined bandwidth of 13.7:1 (0.42-5.77 GHz).

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