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Paper Abstract and Keywords
Presentation 2012-03-16 11:45
Evaluation of Electric Field Strength Computation in Boundary Region between Near and Far Fields
Masaru Nakayama, Takehiko Kobayashi (Tokyo Denki Univ.) EMCJ2011-136
Abstract (in Japanese) (See Japanese page) 
(in English) An equation for calculating electric field strength has been widely used for electromagnetic applications. This equation has also been applied to the calibration of electric field probes, which has been specified in various standards, such as ISO/TR 10305-1, ISO/TR 10305-2 and IEEE Std. 1309. It is, however, valid only in the far field region. It is well known that the far field distance is given by $\lambda$/2$\pi$, where $\lambda$ is the wavelength. This formula, however, gives a distance where the magnitudes of three terms –electrostatic, induction, and radiation fields– are equal. The lowest test frequency specified in ISO 11452-2 is 80 MHz ($\lambda$ = 3.75 m) and the test distance is 1 m, which slightly exceeds $\lambda$/2$\pi$. The accuracy attained by the conventional equation deteriorates at this marginal distance. In this report, a new equation for calculating the electric field strength is proposed, embracing the effects of variations in space impedance. Numerical results yielded by the conventional and proposed equations were compared with the experimental data measured in a radio anechoic chamber. Substantial improvement in accuracy was achieved with the proposed equation.
Keyword (in Japanese) (See Japanese page) 
(in English) electric field strength / near field / far field / radiated immunity test / electric field probe / calibration / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 492, EMCJ2011-136, pp. 37-42, March 2012.
Paper # EMCJ2011-136 
Date of Issue 2012-03-09 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 EMCJ2011-136

Conference Information
Committee EMCJ ITE-BCT  
Conference Date 2012-03-16 - 2012-03-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Broadcast, EMC, etc. 
Paper Information
Registration To EMCJ 
Conference Code 2012-03-EMCJ-BCT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Evaluation of Electric Field Strength Computation in Boundary Region between Near and Far Fields 
Sub Title (in English)  
Keyword(1) electric field strength  
Keyword(2) near field  
Keyword(3) far field  
Keyword(4) radiated immunity test  
Keyword(5) electric field probe  
Keyword(6) calibration  
Keyword(7)  
Keyword(8)  
1st Author's Name Masaru Nakayama  
1st Author's Affiliation Toyko Denki University/EMC Kashima Corporation (Tokyo Denki Univ.)
2nd Author's Name Takehiko Kobayashi  
2nd Author's Affiliation Tokyo Denki University (Tokyo Denki Univ.)
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Speaker Author-1 
Date Time 2012-03-16 11:45:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2011-136 
Volume (vol) vol.111 
Number (no) no.492 
Page pp.37-42 
#Pages 6 
Date of Issue 2012-03-09 (EMCJ) 

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