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In this paper, we proposed a novel harmonic load circuit to design a high efficiency class-F amplifier. The proposed load circuit controls termination impedances to enhance the efficiency of class-F power amplifier. The termination impe - dances at the 2nd and the 3rd harmonics are showed short and open condition, respectively. Also, a fabricated load circuit showed an attenuation characteristic more than 29 dB, that is enough to eliminate harmonics of the class-F power amplifier. The measured drain and power-added efficiency are 75.7 % and 71.3 % at the point of maximum output power 35.17 dBm.

A Novel Harmonic Load Network for High Efficiency Class-F Power Amplifier at 2.14 GHz