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Title: Specific absorption rate (SAR) evaluation of textile antennas
Authors: Soh, Ping Jack ×
Vandenbosch, Guy
Wee, F.
van den Bosch, A.
Martinez, M.
Schreurs, Dominique #
Issue Date: May-2015
Publisher: Antennas and Propagation Society of the Institute of Electrical and Electronics Engineers
Series Title: IEEE Antennas & Propagation Magazine vol:57 issue:2 pages:229-240
Abstract: On-body placement of textile antennas is expected to incur degradation in terms of bandwidth and reflection performance due to power absorption and body coupling. Several prototypes of broadband and dual-band textile antennas have been recently proposed and developed in KU Leuven. Besides proper topology and feeding selection, antennas must be co-simulated with a body-emulating structure during design stage at locations where the antennas are intended for operation. A detailed investigation of the radiation performance and efficiency degradation operated on-body relative to free space have been completed. The remaining issue is to ensure conformance to safety regulations when the antennas are placed near a human user, prior to their implementation on clothing. This is achieved by verifying the antennas' Specific Absorption Rate (SAR), which defines the maximum allowable RF energy absorption into the human user's tissue. This investigation is aimed to further gather exact SAR levels through the use of a certified facility and standard-defined procedures available at IMST. Twenty-two prototypes of dual- and wideband textile antennas designed and fabricated from various materials were measured using a certified DASY 4 SAR measurement system available at IMST. Two frequency points were chosen for measurements, at 2.4 GHz and 5.2 GHz. A repeatability test conducted prior to the start of the measurement campaign indicated a maximum uncertainty of 10.5 %, although most of them are lower. Variation of this uncertainty is also dependent on antenna topology and frequency. All measurements conducted on the planar inverted-F antenna (PIFA) indicated a maximum of 0.6 W/kg averaged over 10g of tissue, which is far less than the European regulated limit of 2 W/kg.
ISSN: 1045-9243
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT- TELEMIC, Telecommunications and Microwaves
× corresponding author
# (joint) last author

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