NDLI: Effects of Dielectric Values of Human Body on Specific Absorption Rate Following 430, 800, and 1200 MHz RF Exposure to Ingestible Wireless Device

Content Provider	IEEE Xplore Digital Library
Author	Xu, L.S. Meng, M.Q.-H. Chao Hu
Copyright Year	1997
Abstract	In order to assess the compliance of ingestible wireless device (IWD) within safety guidelines, the SAR, and near fields of IWD in two realistic human body models, whose dielectric values are increased from the original by ±10% and ± 20% are studied using the finite-difference time-domain method. The radiation characteristics of the IWD in the human body models with changed and unchanged dielectric values are compared. Simulations are carried out at 13 scenarios where the IWD is placed at center positions of abdomens in the two models at the operation frequency of 430, 800, and 1200 MHz, respectively. Results show that variation of radiation intensity near the surface of abdomen is around 2.5, 2.6, and 3.5 dB within 20% variation of dielectric values corresponding to the frequency of 430, 800, and 1200 MHz, respectively. Electric fields in the anterior of the human body models are higher than those in the posterior for all scenarios. SAR values increase with the increase of conductivities of human body tissues, and usually decrease with the increase of relative permittivities of human body tissues. The effect of the dielectric values of human body on SAR is orientation-, human-body-, and frequency-dependent. A variation up to 20% in conductivities and relative permittivities alone or simultaneously always causes a SAR variation less than 10%, 20%, and 30% at the frequency of 430, 800, and 1200 MHz, respectively. As far as the compliance of safety was concerned, the IWD was safe to be used at the input power less than 12.6, 9.3, and 8.4 mW, according to the IEEE safety standards at the frequency of 430, 800, and 1200 MHz, respectively.
Sponsorship	IEEE Engineering in Medicine and Biology Society IEEE Computer Society
Page Count	8
File Size	1524103
Starting Page	52
Ending Page	59
File Format	PDF
ISSN	10897771
Volume Number	14
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectric devices Humans Specific absorption rate Radio frequency Biological system modeling Abdomen Conductivity Permittivity Radiation safety Safety devices SAR Dielectric value finite-difference time domain (FDTD) ingestible wireless device (IWD) radiation characteristics
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications Biotechnology

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