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Paper Abstract and Keywords
Presentation 2012-03-15 11:20
Experimental study on multi-point wireless energy transmission at 950MHz band
Daiki Maehara, Kei Sakaguchi, Kiyomichi Araki (Tokyo Tech.), Takehiro Miyamoto, Minoru Furukawa, Tadashi Shirato (DENGYO) AP2011-201
Abstract (in Japanese) (See Japanese page) 
(in English) Wireless energy transmission at 950MHz band has been applied to many applications including RFID (Radio Frequency IDentification) systems. However, the problem of restricted transmit power defined by radio reg- ulation and the standing-wave occured in indoor propagational environments limit the coverage of wireless energy transmission. On the other hand, limited sensor node life-time has long been an issue in wireless sensor networks. In this study, we proposed multi-point wireless energy transmission with carrier-shift diversity to achieve wider coverage of wireless energy transmission via wireless grid. We conduct an experiment to show the benefits of the proposed scheme in terms of extending coverage. In this experiment, we employ RFID Reader/Writers to perform wireless energy transmission, an IC tag antenna to receive energy, and a phase shifter to perform carrier offset. Experimental results show that the coverage of single-point and multi-point wireless energy transmission without carrier-shift diversity are both 96%. On the other hand, the coverage of proposed wireless energy transmission achieves 100% to activate sensors with consumed power of -10dBm.
Keyword (in Japanese) (See Japanese page) 
(in English) wireless energy transmission / wireless sensor networks / indoor environment / passive RFID / 950MHz / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 487, AP2011-201, pp. 13-17, March 2012.
Paper # AP2011-201 
Date of Issue 2012-03-08 (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 AP2011-201

Conference Information
Committee AP  
Conference Date 2012-03-15 - 2012-03-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Chuo public hall (Atami City) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2012-03-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Experimental study on multi-point wireless energy transmission at 950MHz band 
Sub Title (in English)  
Keyword(1) wireless energy transmission  
Keyword(2) wireless sensor networks  
Keyword(3) indoor environment  
Keyword(4) passive RFID  
Keyword(5) 950MHz  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Daiki Maehara  
1st Author's Affiliation Tokyo Institute of technology (Tokyo Tech.)
2nd Author's Name Kei Sakaguchi  
2nd Author's Affiliation Tokyo Institute of technology (Tokyo Tech.)
3rd Author's Name Kiyomichi Araki  
3rd Author's Affiliation Tokyo Institute of technology (Tokyo Tech.)
4th Author's Name Takehiro Miyamoto  
4th Author's Affiliation Nihon Dengyo Kosaku Co.,Ltd. (DENGYO)
5th Author's Name Minoru Furukawa  
5th Author's Affiliation Nihon Dengyo Kosaku Co.,Ltd. (DENGYO)
6th Author's Name Tadashi Shirato  
6th Author's Affiliation Nihon Dengyo Kosaku Co.,Ltd. (DENGYO)
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Speaker Author-1 
Date Time 2012-03-15 11:20:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2011-201 
Volume (vol) vol.111 
Number (no) no.487 
Page pp.13-17 
#Pages 5 
Date of Issue 2012-03-08 (AP) 

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