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Paper Abstract and Keywords
Presentation 2026-08-22 13:00
[Invited Talk] Polarization Analysis and Humidity Dependence of Dielectric Properties of Polyimide for 5G/6G Wireless Communications
Ririka Sawada, Haonan Liu, Shinji Ando (ISCT) OME2026-11
Abstract (in Japanese) (See Japanese page) 
(in English) We measured the dielectric constant (Dk) and dielectric loss tangent (Df) at 10 GHz for 15 types of polyimide (PI) groups, including fully aromatic, semi-aromatic, partially fluorinated, and perfluorinated varieties, and quantitatively analyzed their correlations with chemical structure, dielectric polarization (Pt) per unit volume, dipole polarization (Pd), and electronic polarization (Pe). It was newly revealed that the Dk and Df of PIs measured in the TE011 mode exhibit anisotropy and show linear relationships with in-plane Pe and Pd, respectively. Since Pd is estimated from Dk and in-plane refractive index (nTE), this result indicates that the real part (Dk) and the imaginary part (Df) of the complex permittivity are interrelated. Furthermore, Dk and Df increased linearly with the relative humidity (RH) of the measurement environment, and their slopes (hDk and hDf), corresponding to their RH sensitivity, were found to be proportional to each other. The weight fraction of polar groups (imide and ester groups) (Polar%) and the weight fraction of hydrophobic fluorine (F%) are important factors that determine the values of hDk and hDf, in addition to Dk and Df. These relationships are highly useful for the design of novel low-dielectric PI materials exhibiting low Dk and Df, as well as low humidity sensitivity.
Keyword (in Japanese) (See Japanese page) 
(in English) Polyimide / 5G/6G wireless communication / dielectric properties / polarization analysis / humidity dependence / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 150, OME2026-11, pp. 1-6, Aug. 2026.
Paper # OME2026-11 
Date of Issue 2026-08-15 (OME) 
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 OME2026-11

Conference Information
Committee OME  
Conference Date 2026-08-22 - 2026-08-22 
Place (in Japanese) (See Japanese page) 
Place (in English) i-port Sado 
Topics (in Japanese) (See Japanese page) 
Topics (in English) biotechnology, surface and interfacial phenomena, measurement technology, electronics, etc. 
Paper Information
Registration To OME 
Conference Code 2026-08-OME 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Polarization Analysis and Humidity Dependence of Dielectric Properties of Polyimide for 5G/6G Wireless Communications 
Sub Title (in English)  
Keyword(1) Polyimide  
Keyword(2) 5G/6G wireless communication  
Keyword(3) dielectric properties  
Keyword(4) polarization analysis  
Keyword(5) humidity dependence  
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1st Author's Name Ririka Sawada  
1st Author's Affiliation Institute of Science Tokyo (ISCT)
2nd Author's Name Haonan Liu  
2nd Author's Affiliation Institute of Science Tokyo (ISCT)
3rd Author's Name Shinji Ando  
3rd Author's Affiliation Institute of Science Tokyo (ISCT)
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Speaker Author-1 
Date Time 2026-08-22 13:00:00 
Presentation Time 45 minutes 
Registration for OME 
Paper # OME2026-11 
Volume (vol) vol.126 
Number (no) no.150 
Page pp.1-6 
#Pages 6 
Date of Issue 2026-08-15 (OME) 

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