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J Electromagn Eng Sci > Volume 16(1); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(1):52-56.
DOI: https://doi.org/10.5515/JKIEES.2016.16.1.52   
Split Slant-End Stubs for the Design of Broadband Efficient Power Amplifiers
Youngcheol Park, Taeggu Kang
Department of Electronics Engineering, Hankuk University of Foreign Studies
Correspondence:  Youngcheol Park,Email: ycpark@hufs.ac.kr
Abstract
This paper suggests a class-F power amplifier with split open-end stubs to provide a broadband high-efficiency operation. These stubs are designed to have wide bandwidth by splitting wide open-end stubs into narrower stubs connected in shunt in an output matching network for class-F operation. In contrast to conventional wideband class-F designs, which theoretically need a large number of matching lines, this method requires fewer transmission lines, resulting in a compact circuit implementation. In addition, the open-end stubs are designed with slant ends to achieve additional wide bandwidth. To verify the suggested design, a 10-W class-F power amplifier operating at 1.7 GHz was implemented using a commercial GaN transistor. The measurement results showed a peak drain efficiency of 82.1% and 750 MHz of bandwidth for an efficiency higher than 63%. Additionally, the maximum output power was 14.45 W at 1.7 GHz.
Key words: Broadband, Class-F, Efficiency, Power Amplifier
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