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Wideband low-profile aperture-coupled circularly polarized antenna based on metasurface

Published online by Cambridge University Press:  22 March 2018

Qi Zheng ,
Chenjiang Guo  and
Jun Ding
Qi Zheng*
Affiliation:
School of Electronics and Information, Northwestern Polytechnical University, Xi'an, China
Chenjiang Guo
Affiliation:
School of Electronics and Information, Northwestern Polytechnical University, Xi'an, China
Jun Ding
Affiliation:
School of Electronics and Information, Northwestern Polytechnical University, Xi'an, China
*
Author for correspondence: Qi Zheng, E-mail: [email protected]
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Abstract

In this paper, a metasurface-based aperture-coupled circularly polarized (CP) antenna with wideband and high radiation gain is proposed and analyzed. The proposed antenna is comprised of coplanar waveguide coupling with 4 × 4 corner truncated square patches, which show compact size and low profile. The mechanism of the CP antenna is analyzed theoretically based on the mode analysis and equivalent circuit analysis. The parameters of feeding structure and truncated corner are studied and optimized to achieve wide impedance bandwidth (BW) and axial ratio (AR) BW. Finally, an overall size of 38.8 mm × 38.8 mm × 3.5 mm (0.71λ0 × 0.71λ0 × 0.064λ0 at 5.5 GHz) CP antenna is proposed and fabricated. The simulated results demonstrate that over 41.7% impedance BW (S11 < −10 dB) of 4.55–6.95 GHz and 3 dB AR BW of 5.05–6.15 GHz (fractional BW is about 19.6%) are achieved. In addition, the antenna yielded a broadside CP radiation with a high gain average about 7.5 dBic. Experimental results are in good agreement with the simulated ones.

Keywords

Aperture-coupled antennacircular polarizationcoplanar waveguidemetasurfacewideband
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Special Issue 7: Electronic Warfare , September 2018 , pp. 851 - 859
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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