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Paper Abstract and Keywords
Presentation 2026-04-10 09:00
Statistical Analysis of Shadowing Loss Based on the First Fresnel Zone Obstruction Ratio
Shunsuke Tsurumi, Akiyoshi Oshige, Hisato Iwai, Shinsuke Ibi (Doshisha Univ.), Naoaki Yoshida, Kohei Tachi, Masashi Motomura, Kei Kameda (Panasonic) AP2026-10
Abstract (in Japanese) (See Japanese page) 
(in English) It is well known that the obstruction of the first Fresnel zone significantly affects received signal strength and forms the basis for shadowing evaluation in direct wave propagation. The obstruction ratio of the first Fresnel zone is also used as an index in regulatory standards such as the Japanese Radio Act (Radio Law). In this study, the relationship between the Fresnel zone obstruction ratio and shadowing loss is investigated. Shadowing loss is analyzed using the Kirchhoff approximation as an analytical method. Practical obstruction scenarios are considered, including cases where obstructions are confined within the zone as well as cases where they extend beyond the zone boundaries. The results quantitatively confirm that shadowing loss is not uniquely determined solely by the obstruction ratio within the zone but varies depending on the obstruction conditions inside and outside the zone. Based on these findings, shadowing loss for a given obstruction ratio is treated statistically, and representative values corresponding to specific probabilities, such as the 99th percentile value, are examined. Comparison between analytical and measurement results confirms the validity of statistically characterizing shadowing loss with respect to the Fresnel zone obstruction ratio.
Keyword (in Japanese) (See Japanese page) 
(in English) Shadowing loss / Fresnel zone / Obstruction ratio / Kirchhoff approximation / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 1, AP2026-10, pp. 45-50, April 2026.
Paper # AP2026-10 
Date of Issue 2026-04-02 (AP) 
ISSN 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 AP2026-10

Conference Information
Committee AP  
Conference Date 2026-04-09 - 2026-04-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Osaka University Nakanoshima Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation, Electoro-magnetic simulation 
Paper Information
Registration To AP 
Conference Code 2026-04-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Statistical Analysis of Shadowing Loss Based on the First Fresnel Zone Obstruction Ratio 
Sub Title (in English)  
Keyword(1) Shadowing loss  
Keyword(2) Fresnel zone  
Keyword(3) Obstruction ratio  
Keyword(4) Kirchhoff approximation  
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1st Author's Name Shunsuke Tsurumi  
1st Author's Affiliation Doshisha University (Doshisha Univ.)
2nd Author's Name Akiyoshi Oshige  
2nd Author's Affiliation Doshisha University (Doshisha Univ.)
3rd Author's Name Hisato Iwai  
3rd Author's Affiliation Doshisha University (Doshisha Univ.)
4th Author's Name Shinsuke Ibi  
4th Author's Affiliation Doshisha University (Doshisha Univ.)
5th Author's Name Naoaki Yoshida  
5th Author's Affiliation Panasonic Corporation (Panasonic)
6th Author's Name Kohei Tachi  
6th Author's Affiliation Panasonic Corporation (Panasonic)
7th Author's Name Masashi Motomura  
7th Author's Affiliation Panasonic Corporation (Panasonic)
8th Author's Name Kei Kameda  
8th Author's Affiliation Panasonic Corporation (Panasonic)
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Speaker Author-1 
Date Time 2026-04-10 09:00:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2026-10 
Volume (vol) vol.126 
Number (no) no.1 
Page pp.45-50 
#Pages 6 
Date of Issue 2026-04-02 (AP) 

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