Abstract
This paper describes a technique to improve the linearity of the Doherty power amplifier by designing a harmonic termination network operating in the 2.4 GHz and 3.5 GHz bands and attenuating the 2nd and 3rd harmonics below −30 dB. The proposed amplifier use CREE CGH 40006P GaN high electron mobility transistors (HEMTs) to be designed as a main amplifier and an auxiliary amplifier, and signals are input to the amplifier through a Wilkinson power divider. The fabricated power amplifiers measured 36.8 dBm of output power and 66.13% of power added efficiency (PAE) in the 2.4 GHz band and 36.1 dBm and 62.03% of the 3.5 GHz band in the maximum output power level. In the 6 dB output back-off level, the PAE was 45.2% in the 2.4 GHz band and 36.7% in the 3.5 GHz band.
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