Analysis of Power Absorbed by Children's Head as a Result of New Usages of Mobile Phone

This paper deals with the influence of new uses of mobile phones (such as short message service, multimedia messaging service, video, etc.) on the SAR induced in different heads models. In particular, the exposure of children will be analyzed. For this reason, three heterogeneous models have been used in this study, two children head models (9 and 15 years old) and one adult head model (“visible human”). The specific anthropomorphic mannequin (SAM) homogeneous head model has been also used to compare all the results and to confirm that the SAM model always overestimates adult and child head exposure. Two handset models have been used: the first model is a triband mobile phone having a patch antenna and the second model is a generic model (known as IEEE mobile phone) having a monopole antenna inside a metal box covered by plastic. A comparison on SAR between adult and child head is given using the finite-difference time-domain method. The results of new positions are compared with respect to the results obtained with the voice position. These studies have been performed at 900, 1800, and 2100 MHz for the triband mobile phone and at 835, 1900, and 2100 MHz for the IEEE mobile phone. The comparison of the maximum SAR over 10 g between the different heads models (9 and 15 year olds and adult) shows that results were nearly similar. It was also pointed out that the value of the maximum local peak SAR in the SAM was always higher than in the adult and children models.

[1]  A. Ahlbom.  Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to 300 GHz) , 1998 .

[2]  J. Wiart,et al.  Study of specific absorption rate (SAR) induced in two child head models and in adult heads using mobile phones , 2005, IEEE Transactions on Microwave Theory and Techniques.

[3]  C. Gabriel.  Compilation of the Dielectric Properties of Body Tissues at RF and Microwave Frequencies. , 1996 .

[4]  Leeka Kheifets,et al.  Childhood leukemia and EMF: Review of the epidemiologic evidence , 2005, Bioelectromagnetics.

[5]  Osamu Fujiwara,et al.  Localized Specific Absorption Rate in the Human Head in Metal-Framed Spectacles for 1.5 GHz hand-Held Mobile Telephones , 1998 .

[6]  William Scanlon,et al.  Influence of wire-framed spectacles on specific absorption rate within human head for 450 MHz personal radio handsets , 2003 .

[7]  Varsha Apte,et al.  CAPACITY ANALYSIS OF THE GSM SHORT MESSAGE SERVICE , .

[8]  A. Faraone,et al.  Comparisons of computed mobile phone induced SAR in the SAM phantom to that in anatomically correct models of the human head , 2006, IEEE Transactions on Electromagnetic Compatibility.

[9]  J. Wiart,et al.  Analysis of RF exposure in the head tissues of children and adults , 2008, Physics in medicine and biology.

[10]  Donna Griffin,et al.  Integrating SIP, presence and FTP to provide wireless multimedia messaging , 2004, 2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733).

[11]  K. Malaric,et al.  Measurement of GSM phone emission , 2004, Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.04CH37510).