Title: On-body calibration and measurements using a personal, distributed exposimeter for wireless fidelity
Authors: Thielens, Arno ×
Agneessens, Sam
De Clercq, Hans
Lecoutere, Jeroen
Verloock, Leen
Tanghe, Emmeric
Aerts, Sam
Puers, Bob
Rogier, Hendrik
Martens, Luc
Joseph, Wout #
Issue Date: Apr-2015
Publisher: Lippincott Williams & Wilkins
Series Title: Health Physics vol:108 issue:4 pages:407-418
Article number: 10.1097/HP.0000000000000238
Abstract: This paper describes the design, calibration, and measurements with a personal, distributed exposimeter (PDE) for the on-body detection of radio frequency (RF) electromagnetic fields due to Wireless Fidelity (WiFi) networks. Numerical simulations show that using a combination of two RF nodes placed on the front and back of the body reduces the 50% prediction interval (PI50) on the incident free-space electric-field strength (Equation is included in full-text article.). Median reductions of 10 dB and 9.1 dB are obtained compared to the PI50 of a single antenna placed on the body using a weighted arithmetic and geometric average, respectively. Therefore, a simple PDE topology based on two nodes, which are deployed on opposite sides of the human torso, is applied for calibration and measurements. The PDE is constructed using flexible, dual-polarized textile antennas and wearable electronics, which communicate wirelessly with a Universal Serial Bus (USB) connected receiver and can be unobtrusively integrated into a garment. The calibration of the PDE in an anechoic chamber proves that the PI50 of the measured (Equation is included in full-text article.)is reduced to 3.2 dB. To demonstrate the real-life usability of the wireless device, a subject was equipped with the PDE during a walk in the city of Ghent, Belgium. Using a sample frequency of 2 Hz, an average incident power density of 59 nW m was registered in the WiFi frequency band during this walk.
ISSN: 0017-9078
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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