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Paper Abstract and Keywords
Presentation 2011-03-03 09:55
A Novel Feeding Circuit with Switching Function of Cardioid and Figure of Eight Radiation Patterns
Daisuke Uchida, Hiroyuki Arai (Yokohama National Univ.), Young Joong Yoon (Yonsei Univ.) AP2010-175
Abstract (in Japanese) (See Japanese page) 
(in English) In diversity and MIMO applications, pattern reconfigurable techniques are required because the propagation path of a radio wave can be changed. Previously, switched-beam antennas based on the Butler matrix was proposed. However, the purpose was to switch the beam direction, and the shapes of the beams could not be changed. In this report, we propose a novel feeding circuit with switching function of cardioid and figure of
eight radiation patterns. The basic structures of the proposed circuit are combinations of the 90 and 180 degree hybrid circuits, and both pattern shapes and directions are changed by switching feeding elements and phase difference feeds. We show the amplitude and phase characteristics of the output signal obtained by the proposed feeding circuit. Then, we reveal that cardioid and figure of eight radiation patterns are achieved when mutual coupling effects are suppressed sufficiently. Even if the effects are not suppressed, uni-directional with F/B ratio of more than 10 dB and bi-directional radiation patterns are obtained.
Keyword (in Japanese) (See Japanese page) 
(in English) Beam switched antennas / feeding circuit / array antenna / phase difference feed / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 446, AP2010-175, pp. 7-12, March 2011.
Paper # AP2010-175 
Date of Issue 2011-02-24 (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 AP2010-175

Conference Information
Committee AP MW  
Conference Date 2011-03-03 - 2011-03-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Ibaraki Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) AP, MW 
Paper Information
Registration To AP 
Conference Code 2011-03-AP-MW 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Novel Feeding Circuit with Switching Function of Cardioid and Figure of Eight Radiation Patterns 
Sub Title (in English)  
Keyword(1) Beam switched antennas  
Keyword(2) feeding circuit  
Keyword(3) array antenna  
Keyword(4) phase difference feed  
Keyword(5)  
Keyword(6)  
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Keyword(8)  
1st Author's Name Daisuke Uchida  
1st Author's Affiliation Yokohama National University (Yokohama National Univ.)
2nd Author's Name Hiroyuki Arai  
2nd Author's Affiliation Yokohama National University (Yokohama National Univ.)
3rd Author's Name Young Joong Yoon  
3rd Author's Affiliation Yonsei University (Yonsei Univ.)
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Speaker Author-1 
Date Time 2011-03-03 09:55:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2010-175 
Volume (vol) vol.110 
Number (no) no.446 
Page pp.7-12 
#Pages 6 
Date of Issue 2011-02-24 (AP) 

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