Design and evaluation of a flexible dual-band meander line monopole antenna for on-and off-body healthcare applications

Shahid M. Ali, Cheab Sovuthy, Sima Noghanian, Zulfiqur Ali, Qammer H. Abbasi, Muhammad A. Imran, Tale Saeidi, Soeung Socheatra

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Abstract

The human body is an extremely challenging environment for wearable antennas due to the complex antenna-body coupling effects. In this article, a compact flexible dual-band planar meander line monopole antenna (MMA) with a truncated ground plane made of multiple layers of standard off-the-shelf materials is evaluated to validate its performance when worn by different subjects to help the designers who are shaping future complex on-/off-body wireless devices. The antenna was fabricated, and the measured results agreed well with those from the simulations. As a reference, in free-space, the antenna provided omnidirectional radiation patterns (ORP), with a wide impedance bandwidth of 1282.4 (450.5) MHz with a maximum gain of 3.03 dBi (4.85 dBi) in the lower (upper) bands. The impedance bandwidth could reach up to 688.9 MHz (500.9 MHz) and 1261.7 MHz (524.2 MHz) with the gain of 3.80 dBi (4.67 dBi) and 3.00 dBi (4.55 dBi), respectively, on the human chest and arm. The stability in results shows that this flexible antenna is sufficiently robust against the variations introduced by the human body. A maximum measured shift of 0.5 and 100 MHz in the wide impedance matching and resonance frequency was observed in both bands, respectively, while an optimal gap between the antenna and human body was maintained. This stability of the working frequency provides robustness against various conditions including bending, movement, and relatively large fabrication tolerances.

Original languageEnglish
Article number475
JournalMicromachines
Volume12
Issue number5
DOIs
Publication statusPublished - 22 Apr 2021

Bibliographical note

Funding Information:
The authors would like to thank the Universiti Teknologi PETRONAS for supporting this research work. This work is funded by YUTP, through the research grant number 015LC0-320.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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