A dielectric free near field phase transforming structure for wideband gain enhancement of antennas

Ahmed, F; Afzal, MU; Hayat, T; Esselle, KP; Thalakotuna, DN

A dielectric free near field phase transforming structure for wideband gain enhancement of antennas

Ahmed, F Afzal, MU Hayat, T Esselle, KP Thalakotuna, DN

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Publisher:: Springer Science and Business Media LLC
Publication Type:: Journal Article
Citation:: Scientific Reports, 2021, 11, (1)
Issue Date:: 2021-12

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Field	Value	Language
dc.contributor.author	Ahmed, F
dc.contributor.author	Afzal, MU
dc.contributor.author	Hayat, T
dc.contributor.author	Esselle, KP
dc.contributor.author	Thalakotuna, DN
dc.date.accessioned	2021-07-31T04:19:57Z
dc.date.available	2021-07-31T04:19:57Z
dc.date.issued	2021-12
dc.identifier.citation	Scientific Reports, 2021, 11, (1)
dc.identifier.issn	2045-2322
dc.identifier.uri	http://hdl.handle.net/10453/150014
dc.description.abstract	<jats:title>Abstract</jats:title><jats:p>The gain of some aperture antennas can be significantly increased by making the antenna near-field phase distribution more uniform, using a phase-transformation structure. A novel dielectric-free phase transforming structure (DF-PTS) is presented in this paper for this purpose, and its ability to correct the aperture phase distribution of a resonant cavity antenna (RCA) over a much wider bandwidth is demonstrated. As opposed to printed multilayered metasurfaces, all the cells in crucial locations of the DF-PTS have a phase response that tracks the phase error of the RCA over a large bandwidth, and in addition have wideband transmission characteristics, resulting in a wideband antenna system. The new DF-PTS, made of three thin metal sheets each containing modified-eight-arm-asterisk-shaped slots, is significantly stronger than the previous DF-PTS, which requires thin and long metal interconnects between metal patches. The third advantage of the new DF-PTS is, all phase transformation cells in it are highly transparent, each with a transmission magnitude greater than − 1 dB at the design frequency, ensuring excellent phase correction with minimal effect on aperture amplitude distribution. With the DF-PTS, RCA gain increases to 20.1 dBi, which is significantly greater than its 10.7 dBi gain without the DF-PTS. The measured 10-dB return loss bandwidth and the 3-dB gain bandwidth of the RCA with DF-PTS are 46% and 12%, respectively.</jats:p>
dc.language	en
dc.publisher	Springer Science and Business Media LLC
dc.relation.ispartof	Scientific Reports
dc.relation.isbasedon	10.1038/s41598-021-93975-2
dc.rights	info:eu-repo/semantics/openAccess
dc.title	A dielectric free near field phase transforming structure for wideband gain enhancement of antennas
dc.type	Journal Article
utslib.citation.volume	11
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
utslib.copyright.status	open_access	*
dc.date.updated	2021-07-31T04:19:54Z
pubs.issue	1
pubs.publication-status	Published online
pubs.volume	11
utslib.citation.issue	1

Abstract:

AbstractThe gain of some aperture antennas can be significantly increased by making the antenna near-field phase distribution more uniform, using a phase-transformation structure. A novel dielectric-free phase transforming structure (DF-PTS) is presented in this paper for this purpose, and its ability to correct the aperture phase distribution of a resonant cavity antenna (RCA) over a much wider bandwidth is demonstrated. As opposed to printed multilayered metasurfaces, all the cells in crucial locations of the DF-PTS have a phase response that tracks the phase error of the RCA over a large bandwidth, and in addition have wideband transmission characteristics, resulting in a wideband antenna system. The new DF-PTS, made of three thin metal sheets each containing modified-eight-arm-asterisk-shaped slots, is significantly stronger than the previous DF-PTS, which requires thin and long metal interconnects between metal patches. The third advantage of the new DF-PTS is, all phase transformation cells in it are highly transparent, each with a transmission magnitude greater than − 1 dB at the design frequency, ensuring excellent phase correction with minimal effect on aperture amplitude distribution. With the DF-PTS, RCA gain increases to 20.1 dBi, which is significantly greater than its 10.7 dBi gain without the DF-PTS. The measured 10-dB return loss bandwidth and the 3-dB gain bandwidth of the RCA with DF-PTS are 46% and 12%, respectively.

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http://hdl.handle.net/10453/150014