A Low-Profile Circularly Polarized Conical-Beam Antenna with Wide Overlap Bandwidth

Wei He, Yejun He*, Long Zhang, Sai Wai Wong, Wenting Li, Amir Boag

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, a low-profile circularly polarized (CP) conical-beam antenna with a wide overlap bandwidth is presented. Such an antenna is constructed on the two sides of a square substrate. The antenna consists of a wideband monopolar patch antenna fed by a probe in the center and two sets of arc-hook-shaped branches. The monopolar patch antenna is loaded by a set of conductive shorting vias to achieve a wideband vertically polarized electric field. Two sets of arc-hook-shaped parasitic branches connected to the patch and ground plane can generate a horizontally polarized electric field. To further increase the bandwidth of the horizontally polarized electric field, two types of arc-hook-shaped branches with different sizes are used, which can generate another resonant frequency. When the parameters of the arc-hook-shaped branches are reasonably adjusted, a 90° phase difference can be generated between the vertically polarized electric field and the horizontally polarized electric field, so that the antenna can produce a wideband CP radiation pattern with a conical beam. The proposed antenna has a wide impedance bandwidth (|S11|<-10 dB) of 35.6% (4.97-7.14 GHz) and a 3 dB axial ratio (AR) bandwidth at phi=0° and theta=35° of about 30.1% (4.97-6.73 GHz). Compared with the earlier reported conical-beam CP antennas, an important feature of the proposed antenna is that the AR bandwidth is completely included in the impedance bandwidth, that is, the overlap bandwidth of |S11|<-10 dB and AR<3 dB is 30.1%. Moreover, the stable omnidirectional conical-beam radiation patterns can be maintained within the whole operational bandwidth.

Original languageEnglish
Article number6648887
JournalWireless Communications and Mobile Computing
Volume2021
DOIs
StatePublished - 2021

Funding

FundersFunder number
National Natural Science Foundation of China61871433, 62071306, RW2019TW001, 61801299
Science, Technology and Innovation Commission of Shenzhen MunicipalityJCYJ20200109113601723, GJHZ20180418190529516, JSGG20180507183215520

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