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A printed wide-beamwidth circularly polarized antenna via two pairs of radiating slots placed in a square contour

Published online by Cambridge University Press:  01 August 2016

Neng-Wu Liu ,
Lei Zhu  and
Wai-Wa Choi
Neng-Wu Liu*
Affiliation:
Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, University of Macau, Macau SAR, China
Lei Zhu
Affiliation:
Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, University of Macau, Macau SAR, China
Wai-Wa Choi
Affiliation:
Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, University of Macau, Macau SAR, China
*
Corresponding author: N.-W. Liu Email: yb47448@umac.mo
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Abstract

A low-profile circularly polarized (CP) slot antenna to achieve a wide axial-ratio (AR) beamwidth is proposed in this paper. The radiating patch consists of two orthogonal pairs of parallel slots etched symmetrically onto a ground plane. Firstly, our theoretical study demonstrates that the CP radiation can be satisfactorily achieved at the broadside, when the vertical and horizontal paired-slots are excited in the same amplitude with 90° phase difference. Secondly, the principle of CP radiation of the proposed antenna on an infinite ground plane is described. Through analyzing the spacing between two parallel slots, the |Eθ| and |Eφ| radiation patterns can be made approximately identical with each other over a large angle range. As such, the slot antenna achieves a wide AR beamwidth. After that, the 3 dB AR beamwidth with respect to the size of a finite ground plane is investigated to constitute a practical CP antenna on a finite ground plane. In final, the proposed CP antenna with a 1–4 probe-to-microstrip feeding network is designed and fabricated on a finite ground plane of a dielectric substrate. Measured results are shown to be in good agreement with the simulated ones about the gain, reflection coefficient, AR bandwidth, and radiation patterns. Most importantly, a wide 3 dB AR beamwidth of 126° and low-profile property with the height of 0.036λ0 are achieved.

Keywords

Antenna designModeling and measurementsAntennas and propagation for wireless systemsWide-beamwidth CP antenna
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 3 , April 2017 , pp. 649 - 656
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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