Low-Pass Load Matching Network Design Using Dumbbell-Shaped DGS for High-Efficiency Microwave Power Amplifiers

As an application example, microstrip line with integrated dumbbell-shaped defected ground structures (DGSs) is adopted in the output matching network (OMN) of a high-efficiency power amplifier (PA) of classes E, E/F, F-1 for size-reduction. Three ways to supply the power for the PA was considered. Two OMN design, prototypes, filter effects and performances are shown. Simulation with transistor model indicates a potential possibility to achieve up to 86.7% power added efficiency (PAE) for the E/F class at 42.92 dBm output power at 2.29 GHz operating frequency.