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Enhancement of off-body communications with a low-SAR, high-gain multiband patch antenna designed with a quad-band artificial magnetic conductor

Published online by Cambridge University Press:  07 November 2023

Vellaichamy Rajavel Open the ORCID record for Vellaichamy Rajavel [Opens in a new window]  and
Dibyendu Ghoshal
Vellaichamy Rajavel*
Affiliation:
Department of ECE, National Institute of Technology Agartala, Agartala, Tripura, India
Dibyendu Ghoshal
Affiliation:
Department of ECE, National Institute of Technology Agartala, Agartala, Tripura, India
*
Corresponding author: V. Rajavel; Email: rajavel572@gmail.com
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Abstract

The increasing demand for wireless communication has emphasized the need for multiband antennas. This study presents a novel design for a multiband antenna with reduced specific absorption rate (SAR), high gain, and improved front-to-back ratio (FBR) achieved through the integration with a 4 × 4 artificial magnetic conductor (AMC) surface. The proposed antenna covers a wide range of wireless frequency bands, including Industrial, Scientific, and Medical, Wireless Local Area Network, Worldwide Interoperability for Microwave Access, Wi-Fi 6E, and 7, with resonating frequencies at 2.4, 3.2, 5.5, 7.5, and 10 GHz. The AMC unit cell creates four zero-degree reflection phases with double negative properties at 2.5, 3.8, 5.5, and 7.5 GHz. The compact design measures 0.23λ0 × 0.296λ0 × 0.0128λ0 and placed 0.104λ0 above an AMC surface of size 0.512λ0 × 0.512λ0 × 0.1296λ0. This structure enhances the gain by up to 8.55dBi at 6.01 GHz. The proposed antenna has −10 dB impedance bandwidth for these corresponding frequencies viz 2.34–2.43 GHz (3.77%), 2.81–3.83 GHz (30.72%), 4.82–6.21 GHz (25.20%), 7–7.65 GHz (8.87%), and 8.06–10.31 GHz (24.5%). An overall average percentage reduction value of SAR taken at these frequencies has been found to be 96.11% with AMC structure. The antenna sample was successfully fabricated, and the experimental results have been found to match well with the simulation results. This integrated design offers a promising solution for wearable off-body communication devices.

Keywords

artificial magnetic conductorfront-to-back ratiohigh gainlow specific absorption ratemultiband antenna
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 21
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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