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Compact ultra-wideband pattern diversity antenna for body-centric communications

Published online by Cambridge University Press:  31 March 2022

Malathi Kanagasabai ,
Padmathilagam Sambandam Open the ORCID record for Padmathilagam Sambandam [Opens in a new window]  and
Mohammed Gulam Nabi Alsath
Malathi Kanagasabai
Affiliation:
Department of Electronics and Communication Engineering, College of Engineering, Guindy, Anna University, Chennai, 600025, India
Padmathilagam Sambandam*
Affiliation:
Department of Electronics and Communication Engineering, College of Engineering, Guindy, Anna University, Chennai, 600025, India
Mohammed Gulam Nabi Alsath
Affiliation:
Department of Electronics and Communication Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, 603110, India
*
Author for correspondence: Padmathilagam Sambandam, E-mail: [email protected]
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Abstract

This paper presents a pattern diversity UWB antenna for Wireless Body Area Network (WBAN) communications. Pattern diversity antenna comprises two antenna elements with directional and omnidirectional patterns suitable for off-body and on-body communications respectively. Several broad-banding techniques such as Co-Planar waveguide, parasitic patches, and cavity resonant techniques are incorporated in microstrip antenna to achieve an ultra-wideband of 7.5 GHz (3.1 to 10.6 GHz) with a directional pattern. Monopole radiator topology is utilized to achieve a UWB frequency range of 2.6–10.6 GHz with an omnidirectional pattern. Pattern diversity is achieved using an orthogonal arrangement of the antenna elements in a compact size of 40 mm × 34 mm, maintaining the isolation >20 dB between the antennas. Gain varies from 2.2 to 4.6 dBi and 2.5 to 7.5 dBi for omnidirectional and directional antenna respectively. The simulated radiation efficiency for the directional antenna and the omnidirectional antenna are 74–86% and 52–66.5% respectively. The proposed design provides a good diversity performance in the entire UWB bandwidth with ECC<0.1 and a diversity gain of approximately 10 dB. SAR impact evaluated under various conditions is found to be <1.6 W/Kg for 1 gram of tissue.

Keywords

Microstrip antennamonopole antennaSARwearable antenna
Type
Biomedical Applications
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 2 , March 2023 , pp. 245 - 254
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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