CST – Computer Simulation Technology

P. J. Soh, S. J. Boyes, G. A. E. Vandenbosch, Y. Huang, S. L. Ooi
Progress In Electromagnetics Research
Volume: 129, 11 July 2012
517 - 539
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 ¯rst 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 2.45 GHz and 5.2 GHz, and the other at 2.45 GHz and 5.8 GHz. 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 that evaluations are carried out while the antenna keeps its planar form.

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