This article proposes a new broadband high-efficiency hybrid power amplifier (PA) design methodology that combines a class-J PA with a class-F PA using GaN HEMT CGH40010F. Multifrequency harmonic control method is employed to achieve harmonic matching network for increasing the bandwidth of the PA. In order to validate the effectiveness of the proposed method, a 1 to 2.8 GHz broadband class F/J PA is designed and fabricated. The simulation and measurement results show that the saturated output power is 40 to 42 dBm, the gain is over 10 dB and the drain efficiency is 65% to 71% at the frequency of 1 to 2.8 GHz.

This paper presents a multi-octave broadband continuous power amplifier based on the simplified real frequency method. By analyzing the load-pull impedance trajectory along with frequency increase at both ends of the transistor's input and output, the input impedance value of the matching circuit can be more coincident with the pull data in the wide band range, which meets the requirement of expanding the bandwidth of the power amplifier. Meanwhile, combining with simplified real frequency method, it can greatly simplify the process of designing broadband matching network. In order to verify the validity of the theory, the power amplifier is designed and fabricated. The measured results show that the maximum output power reached 42.5dBm and the drain efficiency is from 63% to 71% in the 1-3.2 GHz frequency band.

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