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Paper Abstract and Keywords
Presentation 2017-01-20 09:25
An analytical study on the advanced EM shielding for mobile devices to provide sufficient transparency in frequency bands used for wireless communications and attenuation in other frequencies
Go Itami, Yohei Toriumi, Kazuhiro Takaya (NTT) EMCJ2016-117
Abstract (in Japanese) (See Japanese page) 
(in English) There is a concern about a risk of information leakage, such as eavesdropping on display screens and typing characters of mobile devices through electromagnetic radiation from the devices. Conventional electromagnetic shielding technologies, which are applied for suppressing the electromagnetic radiation, cannot be applied in this case, because frequencies of the radiation and wireless communications are in a same range.
This paper describes a proposal of advanced electromagnetic shield, which realizes both the suppression of the electromagnetic radiation, and the wireless communications, by applying electromagnetic-controllable materials on the shield, which are called frequency selective surface (FSS). We have studied about resonator structures of the FSS by electromagnetic field analysis, focusing on the number and center values of resonant frequencies of the FSS with considering size limitations.
As a result, we have found the multi-band resonance of the FSS by applying self-similarity structures on it, and found the downward shift of the resonant frequency of the FSS by extending electrical-pathway of it.
Keyword (in Japanese) (See Japanese page) 
(in English) emanated electromagnetic wave / electromagnetic shield / frequency selective surface / resonator / / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 399, EMCJ2016-117, pp. 45-50, Jan. 2017.
Paper # EMCJ2016-117 
Date of Issue 2017-01-12 (EMCJ) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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)
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Conference Information
Committee EMCJ  
Conference Date 2017-01-19 - 2017-01-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Communication, EMC 
Paper Information
Registration To EMCJ 
Conference Code 2017-01-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An analytical study on the advanced EM shielding for mobile devices to provide sufficient transparency in frequency bands used for wireless communications and attenuation in other frequencies 
Sub Title (in English)  
Keyword(1) emanated electromagnetic wave  
Keyword(2) electromagnetic shield  
Keyword(3) frequency selective surface  
Keyword(4) resonator  
1st Author's Name Go Itami  
1st Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
2nd Author's Name Yohei Toriumi  
2nd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
3rd Author's Name Kazuhiro Takaya  
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Date Time 2017-01-20 09:25:00 
Presentation Time 25 
Registration for EMCJ 
Paper # IEICE-EMCJ2016-117 
Volume (vol) IEICE-116 
Number (no) no.399 
Page pp.45-50 
#Pages IEICE-6 
Date of Issue IEICE-EMCJ-2017-01-12 

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