We have used the finite-difference time-domain method and a new millimeter-resolution anatomically based model of the human to study electromagnetic energy coupled to the head due to mobile telephones at 835 and 1900 MHz.
Assuming reduced dimensions characteristic of today's mobile telephones, we have obtained SAR distributions for two different lengths of monopole antennas of lengths lambda/4 and 3lambda/8 for a model of the adult male and reduced-scale models of 10-and 5-year-old children and find that peak one-voxel and 1-g SAR's are larger for the smaller models of children, particularly at 835 MHz.
Also, a larger in-depth penetration of absorbed energy for these smaller models is obtained.
We have also studied the effect of using the widely disparate tissue properties reported in the literature and of using homogeneous instead of the anatomically realistic heterogeneous models on the SAR distributions.
Homogeneous models are shown to grossly overestimate both the peak 1-voxel and 1-g SAR's. Last, we show that it is possible to use truncated one-half or one-third models of the human head with negligible errors in the calculated SAR distributions.
This simplification will allow considerable savings in computer memory and computation times.
Mots-clés Pascal : Application, Modèle forme humaine, Radiotéléphone, Méthode différence finie, Analyse domaine temps, Antenne hyperfréquence, Tissu, Effet champ électromagnétique, Calcul, Absorption onde électromagnétique, Théorie, Expérience
Mots-clés Pascal anglais : Human head, Human neck, Finite difference time domain, Specific absorption rate, Application, Human form models, Radio telephone, Finite difference method, Time domain analysis, Microwave antennas, Tissue, Electromagnetic field effects, Calculations, Electromagnetic wave absorption, Theory, Experiments
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0485361
Code Inist : 001D04B04C. Création : 10/04/1997.