FDTD analysis of close-coupled 418 MHz radiating devices for human biotelemetry

Citation
Wg. Scanlon et al., FDTD analysis of close-coupled 418 MHz radiating devices for human biotelemetry, PHYS MED BI, 44(2), 1999, pp. 335-345
Citations number
22
Categorie Soggetti
Multidisciplinary
Journal title
PHYSICS IN MEDICINE AND BIOLOGY
ISSN journal
00319155 → ACNP
Volume
44
Issue
2
Year of publication
1999
Pages
335 - 345
Database
ISI
SICI code
0031-9155(199902)44:2<335:FAOC4M>2.0.ZU;2-R
Abstract
This paper describes the finite-difference time-domain (FDTD) analysis of a ntenna-body interaction effects occurring when chest-mounted 418 MHz radio transmitters are used for medical telemetry applications. Whole-body softwa re models (homogeneous, layered and tissue-segmented) were developed for an adult male subject. Using an electrically small (300 mm(2)) planar loop an tenna, calculated radiation efficiencies ranged between 33.5% and 39.2% for a whole-body model, and between 60.7% and 66.1% for a torso; radiation pat terns were found to be largely independent of model composition. The comput ed radiation efficiency for a 21.5 kg phantom representing a six-year-old f emale was within 1.1 dB of measured results (actual body mass 28 kg) and we ll-correlated azimuthal radiation patterns were noted.