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Paper Abstract and Keywords
Presentation 2008-01-24 16:10
Calculations of SAR in a Fetus by a Normal-Mode Helical Antenna with a Metallic Case close to the Abdomen of a Pregnant Woman
Shimpei Akimoto (Chiba Univ.), Tomoaki Nagaoka (NICT), Satoshi Nakata, Satoru Kikuchi, Kazuyuki Saito (Chiba Univ.), Soichi Watanabe (NICT), Masaharu Takahashi, Koichi Ito (Chiba Univ.) AP2007-147
Abstract (in Japanese) (See Japanese page) 
(in English) In the past few years, the radio frequency (RF) devices, which are usually hold in the vicinity of a human body, are increasing, the specific absorption rate (SAR) evaluation of the fetus in the pregnant woman is one of the most important research themes that needs to be taken under consideration. For example, when the wireless radio terminal for business purposes is used on the abdomen of pregnant woman, the electromagnetic wave of this devices penetrates to the deep region of the human body especially the fetus, because the wavelength of the electromagnetic wave of the device operated in VHF band is longer than that of the cellular phone operated at GHz band. In this paper, in order to evaluate the SAR in the pregnant woman and her fetus when wearing the wireless radio terminal on her abdomen, the SAR distribution in the fetus is calculated using the numerical model of the pregnant woman by exposed to near-field of a normal mode helical antenna (NHA) with a metallic case at 150 MHz. In addition, the SAR in the fetus will be evaluated under various positions of the fetus and placenta. As a result, it has been confirmed that the position of NHA affects a substantial change in the tendency of the SAR distribution in deep region of the maternal body. In addition, it has been found that the fetus averaged SAR when the placenta is in the an-tenna side is lower than that is in the maternal back side.
Keyword (in Japanese) (See Japanese page) 
(in English) Pregnant Woman / Fetus / Normal-Mode Helical Antenna / SAR / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 431, AP2007-147, pp. 147-152, Jan. 2008.
Paper # AP2007-147 
Date of Issue 2008-01-16 (AP) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee AP  
Conference Date 2008-01-23 - 2008-01-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Tyeruru.(Naha) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) etc. 
Paper Information
Registration To AP 
Conference Code 2008-01-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Calculations of SAR in a Fetus by a Normal-Mode Helical Antenna with a Metallic Case close to the Abdomen of a Pregnant Woman 
Sub Title (in English)  
Keyword(1) Pregnant Woman  
Keyword(2) Fetus  
Keyword(3) Normal-Mode Helical Antenna  
Keyword(4) SAR  
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1st Author's Name Shimpei Akimoto  
1st Author's Affiliation Chiba University (Chiba Univ.)
2nd Author's Name Tomoaki Nagaoka  
2nd Author's Affiliation National Institute of Information and Communications Technology (NICT)
3rd Author's Name Satoshi Nakata  
3rd Author's Affiliation Chiba University (Chiba Univ.)
4th Author's Name Satoru Kikuchi  
4th Author's Affiliation Chiba University (Chiba Univ.)
5th Author's Name Kazuyuki Saito  
5th Author's Affiliation Chiba University (Chiba Univ.)
6th Author's Name Soichi Watanabe  
6th Author's Affiliation National Institute of Information and Communications Technology (NICT)
7th Author's Name Masaharu Takahashi  
7th Author's Affiliation Chiba University (Chiba Univ.)
8th Author's Name Koichi Ito  
8th Author's Affiliation Chiba University (Chiba Univ.)
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Speaker Author-1 
Date Time 2008-01-24 16:10:00 
Presentation Time 20 minutes 
Registration for AP 
Paper # AP2007-147 
Volume (vol) vol.107 
Number (no) no.431 
Page pp.147-152 
#Pages 6 
Date of Issue 2008-01-16 (AP) 

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