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Paper Abstract and Keywords
Presentation 2009-10-15 16:10
[Invited Talk] Utility and Problem by Using Switching in Radio and Antenna Systems
Makoto Taromaru (ATR) RCS2009-120
Abstract (in Japanese) (See Japanese page) 
(in English) With the advance of power semiconductor devices, power electronics technologies using such switching devices have been spreading into not only industrial field such as electric trains and locomotions, but also commercial use as fluorescent lights and air conditioners. Switching is quite low-loss since the voltage or current of the switching device is zero so switching can make power control with high efficiency.
For radio equipment, class-D, -E, and -F amplifiers use the switching technologies. However, these amplifiers cannot amplify linear modulation signals. On the other hand, switching can be seen as a kind of sampling if the switching frequency is around or greater than the signal bandwidth
that is to be processed by switching. Therefore, in such cases, the voltage or current of RF signals can be controlled continuously with the ON-OFF duty control just like the power switching control.
In this presentation, applications of the switching for radio equipment are presented. Especially, the applications for fast antenna switching
and envelope or amplitude modulation are shown, and their features and problems are discussed.
Keyword (in Japanese) (See Japanese page) 
(in English) switching / PWM / EER / amplitude modulation / diversity / adaptive array antenna / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 229, RCS2009-120, pp. 61-64, Oct. 2009.
Paper # RCS2009-120 
Date of Issue 2009-10-08 (RCS) 
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 RCS2009-120

Conference Information
Committee RCS  
Conference Date 2009-10-15 - 2009-10-16 
Place (in Japanese) (See Japanese page) 
Place (in English) ATR 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing and Transceiver Technologies on High-speed Wireless Packet Communication, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2009-10-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Utility and Problem by Using Switching in Radio and Antenna Systems 
Sub Title (in English)  
Keyword(1) switching  
Keyword(2) PWM  
Keyword(3) EER  
Keyword(4) amplitude modulation  
Keyword(5) diversity  
Keyword(6) adaptive array antenna  
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Keyword(8)  
1st Author's Name Makoto Taromaru  
1st Author's Affiliation ATR Wave Engineering Laboratories (ATR)
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Speaker Author-1 
Date Time 2009-10-15 16:10:00 
Presentation Time 45 minutes 
Registration for RCS 
Paper # RCS2009-120 
Volume (vol) vol.109 
Number (no) no.229 
Page pp.61-64 
#Pages 4 
Date of Issue 2009-10-08 (RCS) 

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