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Paper Abstract and Keywords
Presentation 2019-11-14 16:00
High Efficiency Doherty Amplifier Using T-Shaped Stabs with Spurius Suppression and Impedance Conversion Function
Yuki Takagi, Naoki Hasegawa, Yoshichika Ota (SB), Ryo Ishikawa, Kazuhiko Honjo (UEC) MW2019-107
Abstract (in Japanese) (See Japanese page) 
(in English) In recent years, various types of wireless stations such as a base station used on quasi-millimeter wave band have been studied. For these systems, a size reduction and a high-efficiency technique for power amplifiers are required. The Doherty amplifier has been researched and developed for high-efficiency power amplifier design. However, the Doherty amplifier circuit includes λ/4 transmission lines for impedance conversion and load modulation, which contributes to the circuit size expanding. On the other hand, the harmonics mainly generated by power amplifiers must be suppressed to satisfy spurious specications. In this study, we propose a new circuit-design method using a T-shaped stab for the impedance conversion and the harmonic suppression. The fabricated Doherty amplifier with 64.6 % drain efficiency at a saturated output power of 46.7 dBm was achieved at 2.26 GHz. At 6 dB back-off condition from the saturation, 47.7 % drain efficiency was achieved. In addition, the second and third harmonic spurious levels were reduced to -55.6 dBc and -73.1 dBc, respectively.
Keyword (in Japanese) (See Japanese page) 
(in English) power amplifier / harmonic treatment / high efficiency / GaN HEMT / Doherty / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 292, MW2019-107, pp. 41-46, Nov. 2019.
Paper # MW2019-107 
Date of Issue 2019-11-07 (MW) 
ISSN Print edition: ISSN 0913-5685    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 MW2019-107

Conference Information
Committee MW  
Conference Date 2019-11-14 - 2019-11-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Minami Daido Villa. Tamokuteki Koryu Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave Technologies 
Paper Information
Registration To MW 
Conference Code 2019-11-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) High Efficiency Doherty Amplifier Using T-Shaped Stabs with Spurius Suppression and Impedance Conversion Function 
Sub Title (in English)  
Keyword(1) power amplifier  
Keyword(2) harmonic treatment  
Keyword(3) high efficiency  
Keyword(4) GaN HEMT  
Keyword(5) Doherty  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yuki Takagi  
1st Author's Affiliation SoftBank Corp. (SB)
2nd Author's Name Naoki Hasegawa  
2nd Author's Affiliation SoftBank Corp. (SB)
3rd Author's Name Yoshichika Ota  
3rd Author's Affiliation SoftBank Corp. (SB)
4th Author's Name Ryo Ishikawa  
4th Author's Affiliation The University of Electro-Communications (UEC)
5th Author's Name Kazuhiko Honjo  
5th Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2019-11-14 16:00:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2019-107 
Volume (vol) vol.119 
Number (no) no.292 
Page pp.41-46 
#Pages 6 
Date of Issue 2019-11-07 (MW) 

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