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4G antennas for wireless eyewear devices and related SAR

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journal contribution
posted on 19.04.2016 by Aykut Cihangir, William Whittow, Chinthana Panagamuwa, Gilles Jacquemod, Frederic Gianesello, Cyril Luxey
In this paper, we first present a feasibility study to design 4G antennas (700–960 MHz and 1.7–2.7 GHz) for eyewear devices. Those eyewear devices should be connected to the last generation cellular networks, Wireless Local Area Networks or wireless hotspots. Three coupling element type antennas with their matching networks are evaluated in terms of reflection coefficient and total radiation efficiency when the eyewear is placed on the user's head. We also present Specific Absorption Rate (SAR) simulations when the eyewear is positioned over a homogeneous SAM phantom and over a heterogeneous VH (Visible Human) phantom: the SAR levels are compared to international limit values. In a second step, we present experimental results obtained with 3D printed eyewear and coupling elements etched on a classical PCB substrate where the matching circuits are optimized close to the feeding point of the coupling element. Simulated and measured values are in very good agreement: 7 to 16% and 9 to 35% total efficiency are respectively obtained for the low- and high-frequency bands. However, simulated SAR values are somewhat higher than authorized levels with preoccupant high electromagnetic field distribution close to the eye of the user.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

COMPTES RENDUS PHYSIQUE

Volume

16

Issue

9

Pages

836 - 850 (15)

Citation

CIHANGIR, A. ...et al., 2015. 4G antennas for wireless eyewear devices and related SAR. Comptes Rendus Physique, 16(9), pp. 836-850.

Publisher

© Elsevier France

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

This article was published in Comptes Rendus Physique [© Elsevier France] and the definitive version is available at: http://dx.doi.org/10.1016/j.crhy.2015.10.009

ISSN

1631-0705

Language

en

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