High-Efficiency Power Amplifier for Microwave Power Transmission System

This paper presents a design method to improve the power-added efficiency and output power of microwave power amplifier(PA) by introducing a feedback resonant network between the gate-drain of the transistor, leading to the impedance increase of the internal drain-to-gate feedback branch, decrease power loss of the internal of the transistor, and increasing the power flow to the load while the total generated power remains the same, thus increasing the output power and power-added efficiency of the PA. Besides, the method of circuit stability and performance optimization design is studied to ensure the amplifier performance while taking into account the stability factor measurement and eliminating the instability in the matching network design process.