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Paper Abstract and Keywords
Presentation 2006-07-06 10:00
Determination of the antenna gain in the liquid using the measured near-field data
Nozomu Ishii (Niigata Univ./NICT), Takuhei Akagawa (Niigata Univ.), Ken-ichi Sato (NTT-AT), Lira Hamada, Soichi Watanabe (NICT) AP2006-39
Abstract (in Japanese) (See Japanese page) 
(in English) To estimate the SAR (Specific Absorption Ratio) of the mobile communication device above 3GHz, an alternative method for calibrating the SAR probe is required in place of the conventional calibration using the waveguide system and has been developed by the authors. In our calibration, a reference antenna whose gain is calibrated is immersed in the liquid, and then the electric field intensity radiated from the antenna is related to the output voltage of the SAR probe on the basis of the Friis transmission equation. However, the electric field is significantly attenuated in the liquid and it is difficult to calibrate the antenna gain in the far-field region, where the Friis transmission equation is valid. To overcome the difficulty, we try to use the modified Friis transmission equation in the near-field region, where one antenna can receive the signal from the other antenna in the liquid. In this paper, we show some results of estimating the antenna gain from the near-field data and check the validity of the modified Friis transmission equation.
Keyword (in Japanese) (See Japanese page) 
(in English) SAR / antenna / near-field / absolute gain / Friis transmission equation / tissue equivalent liquid / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 140, AP2006-39, pp. 1-6, July 2006.
Paper # AP2006-39 
Date of Issue 2006-06-29 (AP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 SAT  
Conference Date 2006-07-06 - 2006-07-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Communications, Antennas and Progation, etc. 
Paper Information
Registration To AP 
Conference Code 2006-07-AP-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Determination of the antenna gain in the liquid using the measured near-field data 
Sub Title (in English)  
Keyword(1) SAR  
Keyword(2) antenna  
Keyword(3) near-field  
Keyword(4) absolute gain  
Keyword(5) Friis transmission equation  
Keyword(6) tissue equivalent liquid  
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 Ken-ichi Sato  
3rd Author's Affiliation NTT Advanced Technology Corporation (NTT-AT)
4th Author's Name Lira Hamada  
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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Date Time 2006-07-06 10:00:00 
Presentation Time 25 
Registration for AP 
Paper # IEICE-AP2006-39 
Volume (vol) IEICE-106 
Number (no) no.140 
Page pp.1-6 
#Pages IEICE-6 
Date of Issue IEICE-AP-2006-06-29 

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