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| Presentation | 2008-01-23 15:40 Some evaluation formulas for Wheeler method and corresponding systematic uncertainty Yasuo Katagiri, Nozomu Ishii, Michio Miyakawa (Niigata Univ.)  AP2007-129 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In this paper, we evaluate the systematic uncertainty of some evaluation formulas for Wheeler efficiency using the magnitude of the reflection coefficient or the input impedance or the input conductance in free space and radiation shielding, namely, Wheeler cap. The dimension of the Wheeler cap is selected to avoid dips in the Wheeler efficiency in the desired frequency band. However, the efficiency might fall a little near the antenna resonance, when using the evaluation formula with the magnitude of the reflection coefficient. We also evaluate the systematic uncertainty of our proposed evaluation formula to avoid the above slight dips. As sources of overall uncertainty of the Wheeler efficiency, there are the magnitude of the reflection coefficient, input resistance and the input conductance of the antenna under test in free space and the Wheeler cap. By calculating their contribution of the overall uncertainty, we can find that the measurement of the antenna in the Wheeler cap dominates the overall uncertainty. In addition, we can also find that the uncertainty of the Wheeler efficiency slightly varies from formula to formula by comparing four evaluation formulas. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Wheeler method / radiation efficiency / systematic uncertainty / small antenna / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 107, no. 431, AP2007-129, pp. 39-44, Jan. 2008. | |
| Paper # | AP2007-129 | |
| 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) | |
| Download PDF | AP2007-129 |
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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) | Some evaluation formulas for Wheeler method and corresponding systematic uncertainty |
| Sub Title (in English) | |
| Keyword(1) | Wheeler method |
| Keyword(2) | radiation efficiency |
| Keyword(3) | systematic uncertainty |
| Keyword(4) | small antenna |
| Keyword(5) | |
| Keyword(6) | |
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| 1st Author's Name | Yasuo Katagiri |
| 1st Author's Affiliation | Niigata University (Niigata Univ.) |
| 2nd Author's Name | Nozomu Ishii |
| 2nd Author's Affiliation | Niigata University (Niigata Univ.) |
| 3rd Author's Name | Michio Miyakawa |
| 3rd Author's Affiliation | Niigata University (Niigata Univ.) |
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| Speaker | Author-1 |
| Date Time | 2008-01-23 15:40:00 |
| Presentation Time | 20 minutes |
| Registration for | AP |
| Paper # | AP2007-129 |
| Volume (vol) | vol.107 |
| Number (no) | no.431 |
| Page | pp.39-44 |
| #Pages | 6 |
| Date of Issue | 2008-01-16 (AP) |
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