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Paper Abstract and Keywords
Presentation 2012-08-27 11:00
Comparison of Two Techniques of Preventing Dips of Radiation Efficiency Due to Cavity Resonance in Reflection Method
Nozomu Ishii (Niigata Univ.) AP2012-70
Abstract (in Japanese) (See Japanese page) 
(in English) For the reflection method that can measure the radiation efficiency of small antennas using the rectangular waveguide and sliding shorts, a dip of the radiation efficiency is observed when the cavity formed by the wavegude and shorts is resonant. To overcome the difficulty, the reflection coefficient at the cavity resonance should be excluded when evaluating the radiation efficiency. For the antenna system under test with large loss, the reflection coefficients measured draws a circle whose center is off the origin of the Smith chart and radius is smaller than unity when the sliding shorts are moved. So, the detection algorithm for the cavity resonance using the magnitude of the reflection coefficient should be confirmed to be applied to the antenna with large loss. In addition to the above confirmation, we examine a novel detection method to judge that the measured reflection coefficients are on a circle by calculating the cross-ratio.
Keyword (in Japanese) (See Japanese page) 
(in English) Small antenna / Radiation efficiency / Reflection method / Cavity resonance / Cross ratio / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 187, AP2012-70, pp. 13-18, Aug. 2012.
Paper # AP2012-70 
Date of Issue 2012-08-20 (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 AP2012-70

Conference Information
Committee AP WPT  
Conference Date 2012-08-27 - 2012-08-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Niigata Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antenna Measurement, Wireless Power Transmission, Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2012-08-AP-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Comparison of Two Techniques of Preventing Dips of Radiation Efficiency Due to Cavity Resonance in Reflection Method 
Sub Title (in English)  
Keyword(1) Small antenna  
Keyword(2) Radiation efficiency  
Keyword(3) Reflection method  
Keyword(4) Cavity resonance  
Keyword(5) Cross ratio  
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1st Author's Name Nozomu Ishii  
1st Author's Affiliation Niigata University (Niigata Univ.)
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Speaker Author-1 
Date Time 2012-08-27 11:00:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2012-70 
Volume (vol) vol.112 
Number (no) no.187 
Page pp.13-18 
#Pages 6 
Date of Issue 2012-08-20 (AP) 

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