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Paper Abstract and Keywords
Presentation 2025-09-19 14:45
Radiation Efficiency for Broadband Electrically Small Antennas exited with Folded Structure
Daiki Miyamori, Keisuke Noguchi (KIT), Keisuke Fujita (MIT) AP2025-146
Abstract (in Japanese) (See Japanese page) 
(in English) The use of IoT (Internet of Things) devices equipped with wireless modules has been rapidly expanding, and the antennas embedded in these devices are required to achieve miniaturization while maintaining sufficient performance. However, antenna miniaturization often leads to degradation of characteristics such as radiation efficiency and operating bandwidth, making it challenging to satisfy the required specifications. In this study, electrically small folded antennas much shorter than the wavelength, namely the folded inverted-L antenna (FILA) and the folded meander line antenna (FMLA), are investigated. The radiation efficiency under bandwidth enhancement is clarified through numerical analysis and experimental measurements. In addition, theoretical values of radiation efficiency are derived using an equivalent circuit and compared with both simulation and measurement results. It was found that the radiation efficiency of both FILA and FMLA exceeds 90% at the center frequency. Furthermore, when comparing the frequency ranges where the radiation efficiency is greater than 80%, FILA shows agreement within 5%, whereas FMLA exhibits a difference of approximately 10%.
Keyword (in Japanese) (See Japanese page) 
(in English) folded structure / FILA / FMLA / broadbanding / electrically of small antennas / equivalent circuit / radiation efficiency /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 180, AP2025-146, pp. 271-276, Sept. 2025.
Paper # AP2025-146 
Date of Issue 2025-09-10 (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 AP2025-146

Conference Information
Committee MW AP  
Conference Date 2025-09-16 - 2025-09-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Koganei Campus, Tokyo University of Agriculture and Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Student Session, Microwave, Millimeter wave, Radio propagation, Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2025-09-MW-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Radiation Efficiency for Broadband Electrically Small Antennas exited with Folded Structure 
Sub Title (in English)  
Keyword(1) folded structure  
Keyword(2) FILA  
Keyword(3) FMLA  
Keyword(4) broadbanding  
Keyword(5) electrically of small antennas  
Keyword(6) equivalent circuit  
Keyword(7) radiation efficiency  
Keyword(8)  
1st Author's Name Daiki Miyamori  
1st Author's Affiliation Kanazawa Institute of Technology (KIT)
2nd Author's Name Keisuke Noguchi  
2nd Author's Affiliation Kanazawa Institute of Technology (KIT)
3rd Author's Name Keisuke Fujita  
3rd Author's Affiliation Maebashi Institute of Technology (MIT)
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Speaker Author-1 
Date Time 2025-09-19 14:45:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2025-146 
Volume (vol) vol.125 
Number (no) no.180 
Page pp.271-276 
#Pages 6 
Date of Issue 2025-09-10 (AP) 

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