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J Electromagn Eng Sci > Volume 10(1); 2010 > Article
Journal of the Korean Institute of Electromagnetic and Science 2010;10(1):6-12.
DOI: https://doi.org/10.5515/JKIEES.2010.10.1.006   
Design of Dualband Class-F PAs for Cellular and WLAN Applications
Chang-Min Lee1, Young-Cheol Park1, Hoi-Jin Yoon2
1Dept. of Electronics and Information Engineering, Hankuk University of Foreign Studies
2Dept. of Computer Engineering, Hypsung University
Abstract
In this paper, highly efficient class-F power amplifiers(PAs) with harmonic-controlling transmission lines(TLs) were built for cellular and WLAN applications at 840 MHz and 2.4 GHz each. Also, based on these single-band PAs, a dualband class-F PA was designed after a careful investigation into the harmonics of the two frequencies. The harmonic-controlling TL was designed for the class-F operation at dualband by switching the length of the shunt $lambda$/4 TL part, while the series $lambda$/4 TL is optimized for both frequencies. To verify the performance, two class-F PAs optimized at each frequency and a dualband class-F PA at the corresponding frequencies were built with the secondand the third-harmonic control circuits at each frequencies. As a result, the PA#1 at 840 MHz has a peak drain efficiency of 81.2 % with an output power of 24.4 dBm, while the PA#2 at 2.35 GHz shows a drain efficiency of 94.5 % with an output of 22.8 dBm. Finally, the dualband class-F PA#3 showed 60.5 % and 50.9 % drain efficiencies at 840 MHz and 2.4 GHz, with powers of 23.8 dBm and 19.62 dBm, respectively.
Key words: Class-F, Efficiency, Power Amplifiers

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