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Paper Abstract and Keywords
Presentation 2026-07-23 09:50
Evaluation of Polarization Dependence of Tree Attenuation Based on Quantitative Evaluation of Leaf and Branch Contributions
Rikuya Ban, Yoshiki Nakanishi (Doshisha Univ.), Shigeo Gotoh (Doshisha Univ./Panasonic Electric Works Co., Ltd.), Hisato Iwai, Shinsuke Ibi (Doshisha Univ.) AP2026-52
Abstract (in Japanese) (See Japanese page) 
(in English) This report discusses the polarization dependence of radio wave attenuation caused by trees. The authors have previously defined the attenuation per unit of leaves amount and branches amount as the leaf attenuation coefficient and the branches attenuation coefficient, respectively. Although polarization dependence was not considered in these previous studies, considering the shapes of leaves and branches, it is likely that tree attenuation exhibits polarization dependence. In this report, we determine the polarization dependence of tree attenuation through measurements and FDTD (Finite-Difference Time-Domain) calculations. We demonstrate that, while the attenuation characteristics for horizontal and vertical polarization differ depending on the shape of leaves and branches, the polarization dependence is not significant for the total attenuation of a tree comprising both leaves and branches; therefore, it is considered that polarization dependence need not be considered for practical purposes.
Keyword (in Japanese) (See Japanese page) 
(in English) Tree attenuation / Leaf area density (LAD) / Branch volume density (BVD) / Polarization dependence / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 122, AP2026-52, pp. 57-62, July 2026.
Paper # AP2026-52 
Date of Issue 2026-07-15 (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 AP2026-52

Conference Information
Committee SAT AP SANE  
Conference Date 2026-07-22 - 2026-07-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Kobe Port Oasis 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Remote sensing, Sattelite Communication, Radio propagation, Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2026-07-SAT-AP-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Evaluation of Polarization Dependence of Tree Attenuation Based on Quantitative Evaluation of Leaf and Branch Contributions 
Sub Title (in English)  
Keyword(1) Tree attenuation  
Keyword(2) Leaf area density (LAD)  
Keyword(3) Branch volume density (BVD)  
Keyword(4) Polarization dependence  
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Keyword(6)  
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1st Author's Name Rikuya Ban  
1st Author's Affiliation Doshisha University (Doshisha Univ.)
2nd Author's Name Yoshiki Nakanishi  
2nd Author's Affiliation Doshisha University (Doshisha Univ.)
3rd Author's Name Shigeo Gotoh  
3rd Author's Affiliation Doshisha University/Panasonic Electric Works Co., Ltd. (Doshisha Univ./Panasonic Electric Works Co., Ltd.)
4th Author's Name Hisato Iwai  
4th Author's Affiliation Doshisha University (Doshisha Univ.)
5th Author's Name Shinsuke Ibi  
5th Author's Affiliation Doshisha University (Doshisha Univ.)
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Speaker Author-1 
Date Time 2026-07-23 09:50:00 
Presentation Time 20 minutes 
Registration for AP 
Paper # AP2026-52 
Volume (vol) vol.126 
Number (no) no.122 
Page pp.57-62 
#Pages 6 
Date of Issue 2026-07-15 (AP) 

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