Compact planar monopole antenna for wearable wireless applications

Tsitoha Andriamiharivolamena; Pierre Lemaître-Auger; Smail Tedjini; Franck Tirard

doi:10.1016/j.crhy.2015.07.008

Radio science for connecting humans to information systems / L'homme connecté

Compact planar monopole antenna for wearable wireless applications
[Antenne monopole planaire compacte pour les systèmes de communication sans fil portée sur le corps humain]

Tsitoha Andriamiharivolamena ^1,² ; Pierre Lemaître-Auger ¹ ; Smail Tedjini ¹ ; Franck Tirard ²

¹ Université Grenoble Alpes, LCIS, 50, rue Barthélémy-de-Laffemas, 26902 Valence, France
² SAFRAN SAGEM, 100, avenue de Paris, 91344 Massy, France

Comptes Rendus. Physique, Volume 16 (2015) no. 9, pp. 851-861.

Résumé
Abstract

Nous rapportons dans cet article l'étude et la réalisation d'une antenne de type monopole placée directement au-dessus d'un conducteur magnétique artificiel (AMC) sans introduire une couche supplémentaire entre les deux. Les résultats des simulations, qui ont été validés par des mesures, montrent que les performances de l'antenne étudiée sont aussi bonnes que celles rapportées jusqu'à présent. L'antenne fonctionne à 1,92 GHz, avec une bande passante de 8%. Elle a une adaptation de $- 35 dB$ à sa fréquence de résonance. Le gain mesuré de l'antenne est de 4,3 dBi, avec une ouverture à $- 3 dB$ de 70° et un rapport entre le rayonnement face avant et le rayonnement face arrière de l'antenne de 15,8 dB. Les résultats des mesures et des simulations montrent que l'AMC permet de bien isoler le monopole du corps. La valeur localisée du débit d'absorption spécifique (DAS) calculée avec 1 g de tissu est 0.34 W/Kg pour une puissance injectée de 1 W. Le dispositif avec l'AMC est très bien adapté à des applications où l'antenne doit être portée directement sur le corps humain.

We report in this paper the design and the realization of a compact wearable monopole antenna directly placed over an Artificial Magnetic Conductor (AMC), which is located directly on the body. The major contribution is that there is no space between the monopole and the AMC, or between the AMC and the body. Simulation results and measurements are in good agreement and show that the antenna's performances are as good as the best ones reported so far in the literature, while having a smaller volume. The antenna operates at 1.92 GHz with a bandwidth of 8%. The reflection coefficient of the antenna is $- 35 dB$ . The measurement of the antenna gain provides a value of 4.3 dBi with a half-power beamwidth of 70° and a front-to-back radiation ratio of 15.8 dB. Measurement and simulation results also show that the AMC isolates well the monopole from the body: the localized Specific Absorption Rate (SAR) value calculated with 1 g of tissue is 0.34 W/kg with an injected power of 1 W. The antenna with the AMC is well adapted for wearable applications.

Publié le : 2015-09-11

DOI : 10.1016/j.crhy.2015.07.008

Keywords: Artificial magnetic conductor, High-impedance surface, Planar monopole, Human body, Specific Absorption Rate, Wearable antenna
Mot clés : Conducteur magnétique artificiel, Surface haute impédance, Monopole planaire, Corps humain, Débit d'absorption spécifique, Antenne portée

Affiliations des auteurs :

Tsitoha Andriamiharivolamena ^{1, 2} ; Pierre Lemaître-Auger ¹ ; Smail Tedjini ¹ ; Franck Tirard ²

¹ Université Grenoble Alpes, LCIS, 50, rue Barthélémy-de-Laffemas, 26902 Valence, France
² SAFRAN SAGEM, 100, avenue de Paris, 91344 Massy, France

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     author = {Tsitoha Andriamiharivolamena and Pierre Lema{\^\i}tre-Auger and Smail Tedjini and Franck Tirard},
     title = {Compact planar monopole antenna for wearable wireless applications},
     journal = {Comptes Rendus. Physique},
     pages = {851--861},
     publisher = {Elsevier},
     volume = {16},
     number = {9},
     year = {2015},
     doi = {10.1016/j.crhy.2015.07.008},
     language = {en},
}

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Tsitoha Andriamiharivolamena; Pierre Lemaître-Auger; Smail Tedjini; Franck Tirard. Compact planar monopole antenna for wearable wireless applications. Comptes Rendus. Physique, Volume 16 (2015) no. 9, pp. 851-861. doi : 10.1016/j.crhy.2015.07.008. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.07.008/

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