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A wideband, compact, high gain, low-profile, monopole antenna using wideband artificial magnetic conductor for off-body communications

Published online by Cambridge University Press:  20 April 2021

Bidisha Hazarika ,
Banani Basu Open the ORCID record for Banani Basu [Opens in a new window]  and
Arnab Nandi Open the ORCID record for Arnab Nandi [Opens in a new window]
Bidisha Hazarika
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Silchar, Silchar, Cachar-788010, Assam, India
Banani Basu*
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Silchar, Silchar, Cachar-788010, Assam, India
Arnab Nandi
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Silchar, Silchar, Cachar-788010, Assam, India
*
Author for correspondence: Banani Basu, E-mail: [email protected]
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Abstract

A wideband staircase pattern defected ground monopole antenna integrated with an artificial magnetic conductor (AMC) reflector has been proposed for C-band (4–8 GHz) and ITU band (8.01–8.5 GHz) applications. The integrated antenna consists of a staircase antenna at top, a 2 × 2 AMC reflector at the bottom and an air substrate as gap between them. The AMC offers 18.5% ± 90° reflection phase bandwidth from 6.10 to 7.32 GHz. The AMC layer has achieved mu-negative properties in the designated band. The AMC proffers polarization independent behavior in the respective frequency band depicting robustness in AMC reflection phase characteristics. The integrated antenna has offered a wide impedance bandwidth of 2.78 GHz (42.8% at 6.5 GHz and 34.1% at 8.15 GHz) due to the defected ground monopole. The integration of wideband AMC beneath the staircase monopole antenna alters the out of phase radiation to in-phase planer pattern which enhances the peak gain up to 9.7 dB. It reduces the 1-g averaged specific absorption rate to 0.223 and 0.324 W/kg at the two designated bands. The structure maintains almost similar bandwidth and gain due to artificial human body loading.

Keywords

Artificial magnetic conductor (AMC)specific absorption rate (SAR)unit-cellwideband antenna
Type
Metamaterials and Photonic Bandgap Structures
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 2 , March 2022 , pp. 194 - 203
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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