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| Presentation | 2025-10-24 11:40 Estimation of Permittivity and Conductivity of Ultra-Lightweight Electromagnetic Wave Absorbers and Its Application to Material Design Dan Suzuki, Kishio Hidaka (Tohoku Univ.), Eriko Kijima, Tomonaga Ueno (Nagoya Univ.), Tomoki Osato (SoraMaterials inc.), Motoshi Tanaka, Shotaro Takahashi (Akita Univ.), Saijian Ajia, Yasushi Endo, Sho Muroga (Tohoku Univ.)  EMCJ2025-59 MW2025-145 EST2025-72 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | We investigated a methodology for enhancing the performance of carbon nanotube (CNT) composite electromagnetic wave absorbers by deriving target values from theoretical analysis and comparing them with the materials’ permittivity and conductivity. First, we calculated the design space for the permittivity and conductivity of a 5 mm thick absorber achieving absorption performance above 10 dB or 15 dB in the frequency range of 27.5-29.5 GHz. Next, the electromagnetic properties of CNT-composite materials were estimated and compared against the design space. This result demonstrates that it is possible to enhance the absorption performance by reducing the materials’ conductivity. Furthermore, materials with improved CNT dispersibility were fabricated, and the absorption performance in the target frequency band was enhanced. Therefore, this result demonstrated the validity of the proposed approach. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | CNT / Complex permittivity / Conductivity / Electromagnetic wave absorber / Material design guideline / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 125, no. 208, EMCJ2025-59, pp. 112-117, Oct. 2025. | |
| Paper # | EMCJ2025-59 | |
| Date of Issue | 2025-10-16 (EMCJ, MW, EST) | |
| 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 | EMCJ2025-59 MW2025-145 EST2025-72 |
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| Conference Information | |
| Committee | EMCJ MW EST IEE-EMC |
| Conference Date | 2025-10-23 - 2025-10-24 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | EMCJ |
| Conference Code | 2025-10-EMCJ-MW-EST-EMC |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Estimation of Permittivity and Conductivity of Ultra-Lightweight Electromagnetic Wave Absorbers and Its Application to Material Design |
| Sub Title (in English) | |
| Keyword(1) | CNT |
| Keyword(2) | Complex permittivity |
| Keyword(3) | Conductivity |
| Keyword(4) | Electromagnetic wave absorber |
| Keyword(5) | Material design guideline |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Dan Suzuki |
| 1st Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 2nd Author's Name | Kishio Hidaka |
| 2nd Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 3rd Author's Name | Eriko Kijima |
| 3rd Author's Affiliation | Nagoya University (Nagoya Univ.) |
| 4th Author's Name | Tomonaga Ueno |
| 4th Author's Affiliation | Nagoya University (Nagoya Univ.) |
| 5th Author's Name | Tomoki Osato |
| 5th Author's Affiliation | Soramaterials Incorporated (SoraMaterials inc.) |
| 6th Author's Name | Motoshi Tanaka |
| 6th Author's Affiliation | Aikta University (Akita Univ.) |
| 7th Author's Name | Shotaro Takahashi |
| 7th Author's Affiliation | Aikta University (Akita Univ.) |
| 8th Author's Name | Saijian Ajia |
| 8th Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 9th Author's Name | Yasushi Endo |
| 9th Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 10th Author's Name | Sho Muroga |
| 10th Author's Affiliation | Tohoku University (Tohoku Univ.) |
| Speaker | Author-1 |
| Date Time | 2025-10-24 11:40:00 |
| Presentation Time | 25 minutes |
| Registration for | EMCJ |
| Paper # | EMCJ2025-59, MW2025-145, EST2025-72 |
| Volume (vol) | vol.125 |
| Number (no) | no.208(EMCJ), no.209(MW), no.210(EST) |
| Page | pp.112-117 |
| #Pages | 6 |
| Date of Issue | 2025-10-16 (EMCJ, MW, EST) |
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