Electrically Small Antenna with a Significantly Enhanced Gain-Bandwidth Product

Yu, Y; Tang, MC; Yi, D; Hong, D; Shi, T; Ziolkowski, RW

Electrically Small Antenna with a Significantly Enhanced Gain-Bandwidth Product

Yu, Y Tang, MC Yi, D Hong, D Shi, T Ziolkowski, RW

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Publisher:: Institute of Electrical and Electronics Engineers
Publication Type:: Journal Article
Citation:: IEEE Transactions on Antennas and Propagation, 2022, 70, (5), pp. 3153-3162
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Yu, Y
dc.contributor.author	Tang, MC
dc.contributor.author	Yi, D
dc.contributor.author	Hong, D
dc.contributor.author	Shi, T
dc.contributor.author	Ziolkowski, RW
dc.date.accessioned	2023-03-09T07:20:07Z
dc.date.available	2023-03-09T07:20:07Z
dc.date.issued	2022-01-01
dc.identifier.citation	IEEE Transactions on Antennas and Propagation, 2022, 70, (5), pp. 3153-3162
dc.identifier.issn	0018-926X
dc.identifier.issn	1558-2221
dc.identifier.uri	http://hdl.handle.net/10453/166850
dc.description.abstract	Extremely electrically small antennas (XESAs) exhibit low gain performance, which seriously limits their applications in space-constrained wireless platforms. We report an active transmitting XESA whose gain-bandwidth product (GBWP) exceeds the passive Bode-Fano upper-bound. It is realized by incorporating a highly efficient, electrically small near-field resonant parasitic (NFRP) antenna into the feedback loop of an operational amplifier (OpAmp). Rather than a cascaded configuration, the innovative structural embedding of the NFRP antenna directly with the OpAmp circuit significantly increases its effective gain without consuming any additional real estate. The operating mechanisms of the integrated system are explained with an equivalent circuit model. An optimized prototype was fabricated, assembled and tested. The electrical size of its radiating element is extremely small with ka = 0.15 at 414 MHz, i.e., a ≈ λ/42. The measured results of this active XESA, in good agreement with their simulated values, demonstrate that its effective gain can be dynamically tuned within a 6.01 dB range. The measured maximum effective gain and, hence, the effective isotropic radiated power (EIRP) witnesses a 9.152 dB (8.23 times) improvement in comparison to its passive counterpart and its measured GBWP surpasses the corresponding passive Bode-Fano upper bound by approximately 15.2 times.
dc.language	English
dc.publisher	Institute of Electrical and Electronics Engineers
dc.relation	http://purl.org/au-research/grants/arc/DP160102219
dc.relation.ispartof	IEEE Transactions on Antennas and Propagation
dc.relation.isbasedon	10.1109/TAP.2021.3137215
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0906 Electrical and Electronic Engineering, 1005 Communications Technologies
dc.subject.classification	Networking & Telecommunications
dc.title	Electrically Small Antenna with a Significantly Enhanced Gain-Bandwidth Product
dc.type	Journal Article
utslib.citation.volume	70
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/Strength - GBDTC - Global Big Data Technologies
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
utslib.copyright.embargo	2023-12-28T00:00:00+1000Z
dc.date.updated	2023-03-09T07:19:43Z
pubs.issue	5
pubs.publication-status	Published
pubs.volume	70
utslib.citation.issue	5

Abstract:

Extremely electrically small antennas (XESAs) exhibit low gain performance, which seriously limits their applications in space-constrained wireless platforms. We report an active transmitting XESA whose gain-bandwidth product (GBWP) exceeds the passive Bode-Fano upper-bound. It is realized by incorporating a highly efficient, electrically small near-field resonant parasitic (NFRP) antenna into the feedback loop of an operational amplifier (OpAmp). Rather than a cascaded configuration, the innovative structural embedding of the NFRP antenna directly with the OpAmp circuit significantly increases its effective gain without consuming any additional real estate. The operating mechanisms of the integrated system are explained with an equivalent circuit model. An optimized prototype was fabricated, assembled and tested. The electrical size of its radiating element is extremely small with ka = 0.15 at 414 MHz, i.e., a ≈ λ/42. The measured results of this active XESA, in good agreement with their simulated values, demonstrate that its effective gain can be dynamically tuned within a 6.01 dB range. The measured maximum effective gain and, hence, the effective isotropic radiated power (EIRP) witnesses a 9.152 dB (8.23 times) improvement in comparison to its passive counterpart and its measured GBWP surpasses the corresponding passive Bode-Fano upper bound by approximately 15.2 times.

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http://hdl.handle.net/10453/166850