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Paper Abstract and Keywords
Presentation 2008-07-17 15:05
FDTD Calculation of Whole-Body Average SAR in 9 Month Infant Model For Far-Field Exposure at GHz Band
Naoki Ito, Akimasa Hirata, Osamu Fujiwara (NIT), Tomoaki Nagaoka, Soichi Watanabe (NICT) EMCJ2008-36
Abstract (in Japanese) (See Japanese page) 
(in English) We calculated the whole-body average SAR (specific absorption rate) for 1-6 GHz far-field exposure for spheroidal and ellipsoidal models corresponding to a Japanese 9-month infant model. As a result, we found that in comparison with the whole-body average SAR in the infant model, the ellipsoidal model with the same frontally-projected area as that of the infant model provides an underestimate, while the ellipsoidal model with the same surface area gives an overestimate. In addition, whole-body average SARs of the homogeneous infant model was found to be affected by the electrical constant of tissue, regardless of the model shape and polarization of incident waves. These findings suggest that the ellipsoidal model having the same surface area as that of the infant model and electrical constant of muscle tissue provides a conservative whole-body average SAR. Based on the Kaup index for Japanese 9-month infants, therefore, we developed linearly-reduced 9-month infant models and the corresponding muscle-ellipsoidals, and re-calculated their whole-body average SARs with respect to body shapes. The results reveal that the ellipsoid with the same surface area as that of 9-month infant model gives a conservative whole-body average SAR, whose variability in 9-month infants reaches 15%.
Keyword (in Japanese) (See Japanese page) 
(in English) far-field exposure / 9-month infant model / whole-body average SAR / conservative prediction / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 132, EMCJ2008-36, pp. 61-66, July 2008.
Paper # EMCJ2008-36 
Date of Issue 2008-07-10 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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Conference Information
Committee EMCJ  
Conference Date 2008-07-17 - 2008-07-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMCJ 
Conference Code 2008-07-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) FDTD Calculation of Whole-Body Average SAR in 9 Month Infant Model For Far-Field Exposure at GHz Band 
Sub Title (in English)  
Keyword(1) far-field exposure  
Keyword(2) 9-month infant model  
Keyword(3) whole-body average SAR  
Keyword(4) conservative prediction  
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1st Author's Name Naoki Ito  
1st Author's Affiliation Nagoya Institute of Technology (NIT)
2nd Author's Name Akimasa Hirata  
2nd Author's Affiliation Nagoya Institute of Technology (NIT)
3rd Author's Name Osamu Fujiwara  
3rd Author's Affiliation Nagoya Institute of Technology (NIT)
4th Author's Name Tomoaki Nagaoka  
4th Author's Affiliation National Institute of Information and Communications Technology (NICT)
5th Author's Name Soichi Watanabe  
5th Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2008-07-17 15:05:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2008-36 
Volume (vol) vol.108 
Number (no) no.132 
Page pp.61-66 
#Pages
Date of Issue 2008-07-10 (EMCJ) 


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