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Wideband Dual Circularly Polarized Antenna for Intelligent Transport Systems

Wen, Lehu, Gao, Steven, Luo, Qi, Hu, Wei, Yin, Yingzeng (2020) Wideband Dual Circularly Polarized Antenna for Intelligent Transport Systems. IEEE Transactions on Vehicular Technology, 69 (5). pp. 5193-5202. ISSN 0018-9545. (doi:10.1109/TVT.2020.2980382) (KAR id:81970)

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A wideband dual circularly polarized (DCP) antenna is presented for intelligent transport system (ITS) applications, which can be used to improve the receiver sensitivity and communication quality of ITS. The presented DCP antenna is composed of an orthogonal power divider (OPD) with two orthogonal input ports, four phase shifters for quadrature phase output, and four crossed dipoles for DCP radiation. Detailed equivalent circuit analysis shows that the OPD has two orthogonal inputs and four equal magnitude in-phase and out-of-phase outputs. To achieve two sets of orthogonal quadrature output signals for DCP radiation, the lumped element based differential right-hand transmission line unit cell and left-hand transmission line unit cell are elaborately introduced as the ±45° phase shifters, and incorporated into the OPD. Eventually, orthogonal quadrature signals are successfully obtained and fed to the crossed dipoles for DCP radiation. The proposed antenna was then designed, fabricated, and measured for ITS applications. The measured results show that the overlapped impedance bandwidth of both two input ports is 1.07–1.85 GHz (53.4%), and the isolation is higher than 15.2 dB. Moreover, low axial ratio (<1.7 dB) and symmetrical radiation patterns are achieved for unidirectional DCP radiation.

Item Type: Article
DOI/Identification number: 10.1109/TVT.2020.2980382
Uncontrolled keywords: Dual circular polarization, intelligent transport system, wideband antenna
Subjects: T Technology
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Steven Gao
Date Deposited: 03 Jul 2020 08:59 UTC
Last Modified: 16 Feb 2021 14:13 UTC
Resource URI: (The current URI for this page, for reference purposes)
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