On-Body Characterization of Dual-Band All-Textile PIFA

By Ping Jack Soh, S. Boyes, Guy A. E. Vandenbosch, Y. Huang, S. Ooi. 2012

49 citations recorded by the source corpus.

Antenna performance in terms of re∞ection coe-cient, bandwidth, radiation pattern and e-ciency is expected to be severely in∞uenced during on-body deployment. Besides addressing the need for a systematic on-body evaluation procedure, this work presents an in-depth discussion on the measured degradation relative to free space operation. Considering a practical deployment scenario, the two antenna designs are flrst optimized in proximity of a human- emulating box using a commercial simulator. ShieldIt textile is chosen to build the antenna's conductive components, and this prototype is then benchmarked against another similarly-dimensioned prototype constructed using copper foil. For each material, two dual-band prototypes are fabricated, one resonating at 2.45GHz and 5.2GHz, and the other at 2.45GHz and 5.8GHz. Two realistic on-body deployment locations are chosen to be investigated, on the chest and back, considering two antenna orientations | one radiating away from the user, and the other radiating along the body. Free space and on-body re∞ection coe-cient, bandwidth and radiation pattern are evaluated for each prototype in an anechoic chamber, while a reverberation chamber is utilized to determine their e-ciency. All measurements were carried out using the same human volunteer. Evaluations show that coupling distance and conductivity are the main factors in determining e-ciency rather than on-body location, given

Subfields: Aerospace Engineering, Biomedical Engineering, Computer Networks and Communications

View Paper: https://www.semanticscholar.org/paper/2e96768412516e155a2a3437773187b4a73f78f2

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