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Paper Abstract and Keywords
Presentation 2007-01-26 09:45
A new gain measurement of the reference antenna in the tissue equivalent liquid based on the Fresnel approximation
Nozomu Ishii (Niigata Univ./NICT), Takuhei Akagawa, Naoto Ikarashi (Niigata Univ.), Ken-ichi Sato (NTT-AT), Lira Hamada, Soichi Watanabe (NICT) EMCJ2006-97
Abstract (in Japanese) (See Japanese page) 
(in English) One of calibration techniques for a SAR probe used in the standard SAR measurement is based on the Friis transmission formula. However, the electromagnetic wave is significantly attenuated in the tissue equivalent liquid so that the measurement in the far-field region of the antennas is quite difficult. To overcome the difficulty, the authors extended the Friis transmission formula so as to be valid in the Fresnel region of the antennas. In this report, we clarify that the far-field gain can be estimated by use of only measured data in the Fresnel region.
A target function for the curve fitting is Fresnel region gain which converges with the far-field gain in the far-field region. And, the extended gain can easily replace the formula for the electric field intensity radiated by the antenna in the far-field region as that in the Fresnel region.
Keyword (in Japanese) (See Japanese page) 
(in English) SAR / antenna / Fresnel region / absolute gain / Friis transmission formula / tissue equivalent liquid / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 508, EMCJ2006-97, pp. 1-4, Jan. 2007.
Paper # EMCJ2006-97 
Date of Issue 2007-01-19 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 EMCJ  
Conference Date 2007-01-26 - 2007-01-27 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMCJ 
Conference Code 2007-01-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A new gain measurement of the reference antenna in the tissue equivalent liquid based on the Fresnel approximation 
Sub Title (in English)  
Keyword(1) SAR  
Keyword(2) antenna  
Keyword(3) Fresnel region  
Keyword(4) absolute gain  
Keyword(5) Friis transmission formula  
Keyword(6) tissue equivalent liquid  
Keyword(7)  
Keyword(8)  
1st Author's Name Nozomu Ishii  
1st Author's Affiliation Niigata University/National Institute of Information and Communications Technology (Niigata Univ./NICT)
2nd Author's Name Takuhei Akagawa  
2nd Author's Affiliation Niigata University (Niigata Univ.)
3rd Author's Name Naoto Ikarashi  
3rd Author's Affiliation Niigata University (Niigata Univ.)
4th Author's Name Ken-ichi Sato  
4th Author's Affiliation NTT Advanced Technologｙ Co. (NTT-AT)
5th Author's Name Lira Hamada  
5th Author's Affiliation National Institute of Information and Communications Technology (NICT)
6th Author's Name Soichi Watanabe  
6th Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2007-01-26 09:45:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2006-97 
Volume (vol) vol.106 
Number (no) no.508 
Page pp.1-4 
#Pages 4 
Date of Issue 2007-01-19 (EMCJ) 

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