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Paper Abstract and Keywords
Presentation 2023-06-09 10:20
A study on conformity assessment for smartphones with proximity sensor based SAR reduction functionality
Yuto Shimizu, Hiroshi Kawakami, Tomoaki Nagaoka (NICT) EMCJ2023-15
Abstract (in Japanese) (See Japanese page) 
(in English) The specific absorption rate (SAR) is used for an assessment of a human exposure from wireless communication devices. Wireless devices used near a human body are required to assess a human exposure. In recent years, the smartphones which control the transmitted power based on the proximity sensor for human body sensing become commercially available. The SAR measurement procedure should address such the wireless communication devices. For this reason, SAR based conformity assessment standard describe the evaluation procedure for the wireless devices with the proximity sensor. In this study, we conducted an evaluation accordance with the measurement standard using a commercially available sixteen types of smartphones to verify the validity of the wireless devices with a proximity sensor based SAR reduction functionality. Firstly, we verified that the proximity sensor works on the phantom instead of the human body. The result showed that the proximity sensor worked on the phantom with three types of smartphones and that the proximity sensor trigger position can also be appropriately evaluated. In addition, it was found that the current measurement system based on probe scanning required around one-hundred twenty hour of measurement time when the evaluation method for the proximity sensor in this study was applied. The result showed that the measurement time reduction is one of the future works for the proximity sensor evaluation. Finally, we evaluated the effect of the screen protection film on the operation of the proximity sensor. From the result, the proximity sensor operated regardless of the presence or absence of the protection film.
Keyword (in Japanese) (See Japanese page) 
(in English) conformity assessment / SAR measurement / proximity sensor / / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 72, EMCJ2023-15, pp. 13-18, June 2023.
Paper # EMCJ2023-15 
Date of Issue 2023-06-02 (EMCJ) 
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 EMCJ2023-15

Conference Information
Committee EMCJ  
Conference Date 2023-06-09 - 2023-06-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Otaru Chamber of Commerce & Industry 
Topics (in Japanese) (See Japanese page) 
Topics (in English) EMC 
Paper Information
Registration To EMCJ 
Conference Code 2023-06-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study on conformity assessment for smartphones with proximity sensor based SAR reduction functionality 
Sub Title (in English)  
Keyword(1) conformity assessment  
Keyword(2) SAR measurement  
Keyword(3) proximity sensor  
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1st Author's Name Yuto Shimizu  
1st Author's Affiliation National Institute of Information and Communications Technology (NICT)
2nd Author's Name Hiroshi Kawakami  
2nd Author's Affiliation National Institute of Information and Communications Technology (NICT)
3rd Author's Name Tomoaki Nagaoka  
3rd Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2023-06-09 10:20:00 
Presentation Time 20 minutes 
Registration for EMCJ 
Paper # EMCJ2023-15 
Volume (vol) vol.123 
Number (no) no.72 
Page pp.13-18 
#Pages 6 
Date of Issue 2023-06-02 (EMCJ) 

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