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Paper Abstract and Keywords
Presentation 2025-11-13 13:25
Considerations on the Impedance Transformation Characteristics of λ/4 Transmission Lines and Their π-Type Equivalent Circuits
Satoshi Tanaka, Takeshi Yoshida, Minoru Fujishima (Hiroshima Univ.) CAS2025-38 MSS2025-20
Abstract (in Japanese) (See Japanese page) 
(in English) Quarter-wavelength (λ/4) transmission lines are widely used in RF circuits such as Wilkinson couplers/dividers, RF switches, and impedance converters in Doherty power amplifiers. When applied to integrated circuits, however, λ/4 transmission lines become relatively long compared to other components, and are therefore often replaced by π-type equivalent circuits such as LCL networks. While such equivalent circuits can satisfy the same characteristics as λ/4 transmission lines at the design center frequency, their behavior deviates at other frequencies. In this work, both single-stage and multi-stage π-type equivalent circuits are investigated, and their characteristic differences from λ/4 transmission lines are examined.
Keyword (in Japanese) (See Japanese page) 
(in English) λ/4 transmission line / π-type equivalent circuit / LCL / impedance transformation / matching circuit / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 243, CAS2025-38, pp. 18-23, Nov. 2025.
Paper # CAS2025-38 
Date of Issue 2025-11-06 (CAS, MSS) 
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 CAS2025-38 MSS2025-20

Conference Information
Committee CAS MSS IPSJ-AL  
Conference Date 2025-11-13 - 2025-11-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Ogiya Build 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CAS 
Conference Code 2025-11-CAS-MSS-AL 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Considerations on the Impedance Transformation Characteristics of λ/4 Transmission Lines and Their π-Type Equivalent Circuits 
Sub Title (in English)  
Keyword(1) λ/4 transmission line  
Keyword(2) π-type equivalent circuit  
Keyword(3) LCL  
Keyword(4) impedance transformation  
Keyword(5) matching circuit  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Satoshi Tanaka  
1st Author's Affiliation Hiroshima University (Hiroshima Univ.)
2nd Author's Name Takeshi Yoshida  
2nd Author's Affiliation Hiroshima University (Hiroshima Univ.)
3rd Author's Name Minoru Fujishima  
3rd Author's Affiliation Hiroshima University (Hiroshima Univ.)
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Speaker Author-1 
Date Time 2025-11-13 13:25:00 
Presentation Time 25 minutes 
Registration for CAS 
Paper # CAS2025-38, MSS2025-20 
Volume (vol) vol.125 
Number (no) no.243(CAS), no.244(MSS) 
Page pp.18-23 
#Pages 6 
Date of Issue 2025-11-06 (CAS, MSS) 

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