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| Presentation | 2022-10-19 09:30 [Poster Presentation] Multi-Stage Tapers Improving F/S Ratios of Vivaldi Antennas in Wider Bands Daisuke Homma, Mayumi Matsunaga (Shizuoka Univ.)  AP2022-97 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Multi-stage tapers which suppress sidelobes of Vivaldi antennas in wider bands were proposed. Wideband antennas have huge demands by radio astronomy observation and imaging instruments. Vivaldi antennas are well known for their return loss characteristics are low in wideband. On the other hand, they also have the problem that sidelobe levels are getting higher as higher frequency ranges. This problem is thought to be caused by the delay of traveling waves in their radiation slots. In this study, that multi-stage tapers were able to suppress side lobes of Vivaldi antennas even in high frequency ranges by controlling guided wave velocity was verified. Numerical results obtained by an EM simulator showed that the presented multi-stage tapers improved the Vivaldi antenna’s bandwidth into the range between 600 MHz and 3 GHz, in which the F/S ratio was suppressed into 10 dB or more. For this reason, it was able to be said that multi-stage tapers succeeded suppressing sidelobes of Vivaldi antennas. Finally, the possibility that the presented multi-stage tapers could bring the performance of Vivaldi antennas to the satisfactory level for UHF band radio astronomy instruments was discussed. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Multi-stage tapers / Vivaldi antennas / sidelobes / wideband antennas / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 122, no. 214, AP2022-97, pp. 14-19, Oct. 2022. | |
| Paper # | AP2022-97 | |
| Date of Issue | 2022-10-12 (AP) | |
| ISSN | 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 | AP2022-97 |
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| Conference Information | |
| Committee | AP |
| Conference Date | 2022-10-19 - 2022-10-20 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | GIFU CITY CULTURE CENTER |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Student Session, Antennas and Propagation |
| Paper Information | |
| Registration To | AP |
| Conference Code | 2022-10-AP |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Multi-Stage Tapers Improving F/S Ratios of Vivaldi Antennas in Wider Bands |
| Sub Title (in English) | |
| Keyword(1) | Multi-stage tapers |
| Keyword(2) | Vivaldi antennas |
| Keyword(3) | sidelobes |
| Keyword(4) | wideband antennas |
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| Keyword(6) | |
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| Keyword(8) | |
| 1st Author's Name | Daisuke Homma |
| 1st Author's Affiliation | Shizuoka University (Shizuoka Univ.) |
| 2nd Author's Name | Mayumi Matsunaga |
| 2nd Author's Affiliation | Shizuoka University (Shizuoka Univ.) |
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| Speaker | Author-1 |
| Date Time | 2022-10-19 09:30:00 |
| Presentation Time | 120 minutes |
| Registration for | AP |
| Paper # | AP2022-97 |
| Volume (vol) | vol.122 |
| Number (no) | no.214 |
| Page | pp.14-19 |
| #Pages | 6 |
| Date of Issue | 2022-10-12 (AP) |
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