This letter presents a novel methodology for resistive-resistive series of continuous class-F/F-1modes (Res.-Res. SCF/F-1Ms) power amplifier (PA) design. The bandwidth is expanded by designing the lower band with resistive secondand third-harmonic impedances and the upper band with resistive second-harmonic impedance and reactive thirdharmonic impedance using a waveform engineering method. Mathematical derivation of the methodology is described in detail. The proposed design is experimentally verified using a Res.-Res. SCF/F-1Ms PA operating across 0.4-2.3 GHz with 62.3%-80.5% drain efficiency and 39-42 dBm output power.
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Tang et al. (2017) studied this question.
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