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Paper Abstract and Keywords
Presentation 2023-11-16 11:15
Dual-Band Asymmetric Doherty Amplifier with T-shaped Stubs
Yuki Takagi, Yoshichika Ohta (SB) MW2023-127
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose a design method for a dual-band asymmetric Doherty amplifier at 1.8 GHz(Band3)/2.1 GHz (Band1) frequencies. Our design incorporates T-shaped stubs that can effectively short two harmonics at a single connection point. In the asymmetric Doherty amplifier, two T-shaped stubs are employed to short the fourth and fifth harmonics of each frequency band, which are connected to the impedance conversion circuit at the same junction point. Additionally, a λ/2 short stub of the second harmonic in Band1 is used at the synthesis point to short the even-order harmonics of Band1 and fine-tune the impedance conversion value for Band3 fundamental frequency. At 1850 MHz, the fabricated Doherty amplifier achieved 67.6% and 26.9% drain efficiency, with a saturated output power of 48.5 dBm and 6.1 dB back-off condition from saturation, respectively. Similarly, at 2140 MHz, it achieved 43.4% and 37.4% drain efficiency, with a saturated output power of 46.6 dBm and 8.5 dB back-off condition from saturation, respectively. Furthermore, under modulated signal output power of 38.5 dBm in 1850 MHz and 2140 MHz, the spurious level up to the fifth harmonic were measured to be -36 dBc or less, respectively.
Keyword (in Japanese) (See Japanese page) 
(in English) power amplifier / asymmetric Doherty amplifier / harmonic treatment / LDMOS / dual-band / impedance conversion circuit / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 268, MW2023-127, pp. 7-12, Nov. 2023.
Paper # MW2023-127 
Date of Issue 2023-11-09 (MW) 
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 MW2023-127

Conference Information
Committee MW  
Conference Date 2023-11-16 - 2023-11-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Nago City Industrial Support Center (Okinawa) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, etc. 
Paper Information
Registration To MW 
Conference Code 2023-11-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Dual-Band Asymmetric Doherty Amplifier with T-shaped Stubs 
Sub Title (in English)  
Keyword(1) power amplifier  
Keyword(2) asymmetric Doherty amplifier  
Keyword(3) harmonic treatment  
Keyword(4) LDMOS  
Keyword(5) dual-band  
Keyword(6) impedance conversion circuit  
Keyword(7)  
Keyword(8)  
1st Author's Name Yuki Takagi  
1st Author's Affiliation SoftBank (SB)
2nd Author's Name Yoshichika Ohta  
2nd Author's Affiliation SoftBank (SB)
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Speaker Author-1 
Date Time 2023-11-16 11:15:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2023-127 
Volume (vol) vol.123 
Number (no) no.268 
Page pp.7-12 
#Pages 6 
Date of Issue 2023-11-09 (MW) 

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