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Paper Abstract and Keywords
Presentation 2018-11-15 10:25
Miniaturization of Harmonic Impedance Transformer and its Application to Class-F Amplifiers
Kento Saiki, Shinichi Tanaka (Shibaura Inst. of Tech.), Ryo Ishikawa, Kazuhiko Honjo (Univ. of Electro-Communications) MW2018-93
Abstract (in Japanese) (See Japanese page) 
(in English) A new method of miniaturizing the quarter-wavelength ($lambda$/4) harmonic impedance (Z) transformer in a class-F amplifier is presented. The proposed Z-transformer, consisting of a short microstrip line (< $lambda$/4), a shunt inductance and series capacitance, is equivalent to conventional $lambda$/4 Z-transformer in that it transforms the RF-shorts at the 2nd and 3rd harmonics to a short and an open at the respective harmonic frequencies. Furthermore, it provides a DC-bias feed path along the shunt inductor, eliminating the need to use additional DC biasing circuit and thus reducing the footprint of the whole amplifier circuit. We also conducted a theoretical trade-off design analysis, considering various limitations faced when implementing the proposed circuit to practical amplifiers. By combining the optimized Z-transformer and a compact CRLH transmission line stub (for harmonic shorts), we fabricated a 2-GHz GaN HEMT class-F power amplifier with good performance of 40.6 dBm output power and 74.6% power-added efficiency.
Keyword (in Japanese) (See Japanese page) 
(in English) Class-F amplifier / Impedance transformer / CRLH / Harmonic tuning / Power-added efficiency / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 308, MW2018-93, pp. 7-12, Nov. 2018.
Paper # MW2018-93 
Date of Issue 2018-11-08 (MW) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee MW  
Conference Date 2018-11-15 - 2018-11-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukue Cultural Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave Technologies 
Paper Information
Registration To MW 
Conference Code 2018-11-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Miniaturization of Harmonic Impedance Transformer and its Application to Class-F Amplifiers 
Sub Title (in English)  
Keyword(1) Class-F amplifier  
Keyword(2) Impedance transformer  
Keyword(3) CRLH  
Keyword(4) Harmonic tuning  
Keyword(5) Power-added efficiency  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Kento Saiki  
1st Author's Affiliation Shibaura Institute of Technology (Shibaura Inst. of Tech.)
2nd Author's Name Shinichi Tanaka  
2nd Author's Affiliation Shibaura Institute of Technology (Shibaura Inst. of Tech.)
3rd Author's Name Ryo Ishikawa  
3rd Author's Affiliation University of Electro-Communications (Univ. of Electro-Communications)
4th Author's Name Kazuhiko Honjo  
4th Author's Affiliation University of Electro-Communications (Univ. of Electro-Communications)
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Speaker Author-1 
Date Time 2018-11-15 10:25:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2018-93 
Volume (vol) vol.118 
Number (no) no.308 
Page pp.7-12 
#Pages 6 
Date of Issue 2018-11-08 (MW) 

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