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

William Scanlon, N.E. Evans, J.B. Burns

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

This paper describes the finite-difference time-domain (FDTD) analysis of antenna-body interaction effects occurring when chest-mounted 418 MHz radio transmitters are used for medical telemetry applications. Whole-body software models (homogeneous, layered and tissue-segmented) were developed for an adult male subject. Using an electrically small (300 mm(2)) planar loop antenna, 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 patterns were found to be largely independent of model composition. The computed radiation efficiency for a 21.5 kg phantom representing a six-year-old female was within 1.1 dB of measured results (actual body mass 28 kg) and well-correlated azimuthal radiation patterns were noted.
Original languageEnglish
Pages (from-to)335-345
Number of pages11
JournalPhysics in Medicine and Biology
Volume44 (2)
Issue number2
DOIs
Publication statusPublished - Feb 1999

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physics and Astronomy (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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