A small-sized class-J power amplifier from combined multi-harmonic voltage reflection functions

In this study, multi-harmonic voltage reflections are analyzed for compact power amplifiers that can be integrated into micro-sized radio units. By combining impedances at DC and harmonic frequencies throughout the transmission lines of power amplifier circuits, this method is used to reduce analytically the footprint of these circuits. Further, a cost function that takes the occupied area and the circuit performance into account is used to measure the effectiveness of the suggested method. For the sake of verification, a 10W class-J power amplifier is designed for 2.0– 2.5GHz, and showed a 35% reduction in its footprint, a peak efficiency of 71.3%, an output power of 40 dBm.