Design of a dual‐band sequential power amplifier. Issue 1 (January 2016)

• Record Type: Journal Article
• Authors: Shao, Jin; Ren, Han; Zhou, Mi; Arigong, Bayaner; Ding, Jun; Fu, Song; Kim, Hyoungsoo; Zhang, Hualiang
• Is Part Of: Microwave and optical technology letters. Volume 58:Issue 1(2016:Jan.)
• Page Start: 99
• Page End: 102
• Publication Date: 2016-01
• Subjects: drain efficiency -- dual‐band -- GaN -- power back‐off -- sequential power amplifier; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.29508
• Languages: English
• ISSNs: 0895-2477

Abstract

ABSTRACT: In this article, we present a dual‐band sequential power amplifier (SPA) to provide high efficiency at power back‐offs and maximum output power at two separate working frequencies. The proposed SPA, including a carrier amplifier, a peaking amplifier, a power divider, and a combing coupler, is fabricated on Isola I‐TeraMTRF boards with 3.45 dielectric constant, 0.0028 loss tangent, and 0.508 mm substrate thickness. The SPA provides 48 and 62% drain efficiency (DE) at 6 dB output back‐ off (OBO) and maximum output power at 1.1 GHz (first design frequency), and it also provides 52 and 65% DE at 6 dB OBO and maximum output power at 1.5 GHz (second design frequency). The designed SPA achieves above 39 dBm output powers at two working frequencies with about 10 dB gain and ±1.3 dB gain flatness. To the best of the authors' knowledge, it is the first time that a dual‐band SPA is reported and demonstrated experimentally. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:99–102, 2016