Abstract
This study presents a broadband and high-efficiency Class-J power amplifier (PA)-based on a modified multisection quarter-wave lines and short-circuited stubs matching network (MN). It is noted that the modified structure, with good design convenience and great frequency selectivity, especially in the roll-off region between the highest frequency of the desired band ( f H ) and second harmonic of the lowest frequency of the band (2 f L ), is for the first time employed to design PAs with more optimal performance and greater bandwidths (BWs). A step-by-step design procedure of the proposed structure is presented. Experimental results show that using a 10-W Wolfspeed GaN HEMT device, a highly efficient broadband Class-J PA is realised from 1.4 to 2.4 GHz (fractional BW = 52.6%) with measured drain efficiency of 63.0–68.9% and output power of 39.8–40.3 dBm.
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