Gain Enhancement of Low-Profile Omnidirectional Antenna Using Annular Magnetic Dipole Directors

Lin, S; Liao, S; Yang, Y; Che, W; Xue, Q

Gain Enhancement of Low-Profile Omnidirectional Antenna Using Annular Magnetic Dipole Directors

Lin, S Liao, S Yang, Y

Che, W Xue, Q

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Publisher:: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Publication Type:: Journal Article
Citation:: IEEE Antennas and Wireless Propagation Letters, 2021, 20, (1), pp. 8-12
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Lin, S
dc.contributor.author	Liao, S
dc.contributor.author	Yang, Y https://orcid.org/0000-0001-7439-2156
dc.contributor.author	Che, W
dc.contributor.author	Xue, Q
dc.date.accessioned	2022-04-30T01:49:56Z
dc.date.available	2022-04-30T01:49:56Z
dc.date.issued	2021-01-01
dc.identifier.citation	IEEE Antennas and Wireless Propagation Letters, 2021, 20, (1), pp. 8-12
dc.identifier.issn	1536-1225
dc.identifier.issn	1548-5757
dc.identifier.uri	http://hdl.handle.net/10453/156843
dc.description.abstract	An annular array antenna is proposed in this letter. The proposed low-profile antenna produces an enhanced gain with omnidirectional vertically polarized radiation patterns. Center-fed via-shorted circular patch antenna with omnidirectional radiation pattern can be low profile and wide bandwidth but suffers from tilted beam leading to a low gain in the azimuth plane. To improve the azimuth gain, instead of the traditional way of increasing the profile, a low-profile omnidirectional director is exploited, which is basically a passive magnetic dipole consisting of an annular side-coupling open-cavity. Several directors cooperating with the driven element form the proposed antenna, whose working principle is similar to the Yagi-Uda antenna. A prototype with a low profile of 0.11 λ0 is designed and fabricated. Measured results show that the prototype can realize -10-dB impedance bandwidth of 13% (4.72-5.42 GHz) and gain of 3.72 dBi at 5.34 GHz with good omnidirectivity. Compared with that of the driven element only, the omnidirectional azimuth gain is significantly improved within the bandwidth, with the maximum gain being enhanced from -4.2 to 3.72 dBi at 5.34 GHz. The proposed antenna is designed for a portable 5G sub-6 GHz wireless channel measurement application.
dc.language	English
dc.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
dc.relation.ispartof	IEEE Antennas and Wireless Propagation Letters
dc.relation.isbasedon	10.1109/LAWP.2020.3035819
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0906 Electrical and Electronic Engineering, 1005 Communications Technologies
dc.subject.classification	Networking & Telecommunications
dc.title	Gain Enhancement of Low-Profile Omnidirectional Antenna Using Annular Magnetic Dipole Directors
dc.type	Journal Article
utslib.citation.volume	20
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
utslib.copyright.status	closed_access	*
dc.date.updated	2022-04-30T01:49:53Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	20
utslib.citation.issue	1

Abstract:

An annular array antenna is proposed in this letter. The proposed low-profile antenna produces an enhanced gain with omnidirectional vertically polarized radiation patterns. Center-fed via-shorted circular patch antenna with omnidirectional radiation pattern can be low profile and wide bandwidth but suffers from tilted beam leading to a low gain in the azimuth plane. To improve the azimuth gain, instead of the traditional way of increasing the profile, a low-profile omnidirectional director is exploited, which is basically a passive magnetic dipole consisting of an annular side-coupling open-cavity. Several directors cooperating with the driven element form the proposed antenna, whose working principle is similar to the Yagi-Uda antenna. A prototype with a low profile of 0.11 λ0 is designed and fabricated. Measured results show that the prototype can realize -10-dB impedance bandwidth of 13% (4.72-5.42 GHz) and gain of 3.72 dBi at 5.34 GHz with good omnidirectivity. Compared with that of the driven element only, the omnidirectional azimuth gain is significantly improved within the bandwidth, with the maximum gain being enhanced from -4.2 to 3.72 dBi at 5.34 GHz. The proposed antenna is designed for a portable 5G sub-6 GHz wireless channel measurement application.

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http://hdl.handle.net/10453/156843