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Related Experiment Videos

Radiowave propagation from a tissue-implanted source at 418 MHz and 916.5 MHz.

W G Scanlon1, J B Burns, N E Evans

  • 1School of Electrical and Mechanical Engineering, University of Ulster, Newtownabbey, Co. Antrim, N. Ireland, U.K. w.scanlon@ulst.ac.uk

IEEE Transactions on Bio-Medical Engineering
|April 14, 2000
PubMed
Summary

Radio device performance in the human vagina was measured. UHF radio propagation from vaginal implants showed significant signal loss, with higher frequencies experiencing greater attenuation.

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The design and performance of a 2.5-GHz telecommand link for wireless biomedical monitoring.

IEEE transactions on information technology in biomedicine : a publication of the IEEE Engineering in Medicine and Biology Society·2001

Area of Science:

  • Biomedical Engineering
  • Electromagnetics
  • Medical Device Technology

Background:

  • Ultra-high frequency (UHF) radio devices are increasingly used for in-body telemetry and telecommand in both human and animal applications.
  • Accurate characterization of radio propagation from implanted devices is crucial for reliable system performance.

Purpose of the Study:

  • To experimentally measure and electromagnetically model radio propagation from UHF sources implanted in the human vagina.
  • To evaluate the impact of frequency and tissue modeling detail on radiation efficiency and signal loss.

Main Methods:

  • Construction of whole-body homogeneous and semi-segmented software models using Visible Human Project data.
  • Finite-difference time-domain (FDTD) simulations to calculate bodyworn radiation efficiencies for 418-MHz and 916.5-MHz sources.

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  • Experimental measurements of radio propagation from vaginal sources.

    • Main Results:

    • Radiation efficiencies for a 418-MHz source ranged from 1.6% to 3.4% (14.7–18.0 dB body loss).
    • Higher frequencies at 916.5 MHz showed lower efficiencies (0.36%–0.46%) with greater losses (23.4–24.4 dB).
    • Simulations closely matched experimental measurements (within 2 dB at 418 MHz, 3 dB at 916.5 MHz).
    • Tissue segmentation detail minimally affected radiation patterns and efficiency when the source region was detailed.

    Conclusions:

    • Radio propagation from vaginal UHF implants is significantly affected by frequency and body attenuation.
    • Detailed electromagnetic modeling, even with simplified whole-body segmentation, can accurately predict performance.
    • Findings are critical for designing reliable wireless medical devices for internal use.