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| Presentation | 2009-09-04 10:50 Operating Principle of Tap Structures in the Very Small Normal Mode Helical Antenna Nguyen Quoc Dinh, Naobumi Michishita, Yoshihide Yamada (NDA), Koji Nakatani (Yokohama Rubber)  AP2009-94 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | The normal-mode helical antenna becomes an efficient radiator in the condition of the self resonance. When the antenna size becomes less than 0.05 wavelengths, the antenna input resistance becomes very small such as a few ohms. So, the impedance matching structure becomes inevitable. Authors developed a simple tap structure that was composed along with the helical wire. However, the design method was not cleared. In this paper, the antenna structure of a normal-mode helical with a tap is converted to a circuit model. By solving the circuit equations, the input impedance of the tap is easily obtained. When the self resonance condition is applied, the tap impedance becomes very simple. The step up ratio of the tap is shown to be dependent on the mutual inductance between the antenna and the tap. Moreover, design data of the mutual inductance are shown. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Normal-Mode Helical Antenna / Tap Feed / Mutual inductance / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 109, no. 183, AP2009-94, pp. 85-90, Sept. 2009. | |
| Paper # | AP2009-94 | |
| Date of Issue | 2009-08-27 (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 | AP2009-94 |
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| Conference Information | |
| Committee | AP |
| Conference Date | 2009-09-03 - 2009-09-04 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hachinohe Inst. of Tech. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | AP |
| Paper Information | |
| Registration To | AP |
| Conference Code | 2009-09-AP |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Operating Principle of Tap Structures in the Very Small Normal Mode Helical Antenna |
| Sub Title (in English) | |
| Keyword(1) | Normal-Mode Helical Antenna |
| Keyword(2) | Tap Feed |
| Keyword(3) | Mutual inductance |
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| 1st Author's Name | Nguyen Quoc Dinh |
| 1st Author's Affiliation | National Defense Academy (NDA) |
| 2nd Author's Name | Naobumi Michishita |
| 2nd Author's Affiliation | National Defense Academy (NDA) |
| 3rd Author's Name | Yoshihide Yamada |
| 3rd Author's Affiliation | National Defense Academy (NDA) |
| 4th Author's Name | Koji Nakatani |
| 4th Author's Affiliation | The Yokohama Rubber Co.Ltd (Yokohama Rubber) |
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| Speaker | Author-1 |
| Date Time | 2009-09-04 10:50:00 |
| Presentation Time | 25 minutes |
| Registration for | AP |
| Paper # | AP2009-94 |
| Volume (vol) | vol.109 |
| Number (no) | no.183 |
| Page | pp.85-90 |
| #Pages | 6 |
| Date of Issue | 2009-08-27 (AP) |
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