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| Presentation | 2007-05-25 13:05 Uncertainty of simultaneous measurement of antenna gain in the liquid and its dielectric property including the contribution of the Fresnel-field Hiroki Shiga, Naoto Ikarashi (Niigata Univ.), Nozomu Ishii (Niigata Univ./NICT), Ken-ichi Sato (NTT-AT), Lira Hamada, Soichi Watanabe (NICT)  EMCJ2007-10 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | As a technique for calibrating electric-field probes used in standardized SAR (Specific Absorption Rate) assessment, we have studied the technique using the Friis transmission formula in the tissue equivalent liquid. It is difficult to measure power transmission between two reference antennas in far-field region due to large attenuation in the liquid. This means that the conventional Friis transmission formula cannot be applied to our measurement so that we developed an extension of this formula that is valid in Fresnel-field region. In this report, the method of weighted least square is introduced to reduce the contribution of noise in the measurement system when the gain of the antenna in the liquid is determined by curve-fitting. And we examine how to choice the fitting range to reduce the uncertainty of the estimated gain. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | SAR / Fresnel-field region / absolute gain / Friis transmission equation / least square method / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 107, no. 68, EMCJ2007-10, pp. 1-5, May 2007. | |
| Paper # | EMCJ2007-10 | |
| Date of Issue | 2007-05-18 (EMCJ) | |
| 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) | |
| Download PDF | EMCJ2007-10 |
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| Conference Information | |
| Committee | EMCJ |
| Conference Date | 2007-05-25 - 2007-05-25 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Niigata University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | EMCJ |
| Conference Code | 2007-05-EMCJ |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Uncertainty of simultaneous measurement of antenna gain in the liquid and its dielectric property including the contribution of the Fresnel-field |
| Sub Title (in English) | |
| Keyword(1) | SAR |
| Keyword(2) | Fresnel-field region |
| Keyword(3) | absolute gain |
| Keyword(4) | Friis transmission equation |
| Keyword(5) | least square method |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Hiroki Shiga |
| 1st Author's Affiliation | Niigata University (Niigata Univ.) |
| 2nd Author's Name | Naoto Ikarashi |
| 2nd Author's Affiliation | Niigata University (Niigata Univ.) |
| 3rd Author's Name | Nozomu Ishii |
| 3rd Author's Affiliation | Niigata University/National Institute of Information and Communications Technology (Niigata Univ./NICT) |
| 4th Author's Name | Ken-ichi Sato |
| 4th Author's Affiliation | NTT Advanced Technology (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 | 2007-05-25 13:05:00 |
| Presentation Time | 25 minutes |
| Registration for | EMCJ |
| Paper # | EMCJ2007-10 |
| Volume (vol) | vol.107 |
| Number (no) | no.68 |
| Page | pp.1-5 |
| #Pages | 5 |
| Date of Issue | 2007-05-18 (EMCJ) |
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