This thesis presents the design of S-band high-efficiency 10W power amplifier based on harmonic impedance control. To achieve flexible performance trade-offs between efficiency and linearity, a dual-mode Class-F-1/Class-J power amplifier is first impl...
This thesis presents the design of S-band high-efficiency 10W power amplifier based on harmonic impedance control. To achieve flexible performance trade-offs between efficiency and linearity, a dual-mode Class-F-1/Class-J power amplifier is first implemented using a second-harmonic reactance-injection stub and a Schottky-diode-based switching network, enabling mode reconfiguration within a single hardware platform. In addition, Class-F-based Doherty power amplifier is proposed by integrating harmonic impedance control into the output matching network to preserve Class-F operating conditions during load modulation. The proposed structure improves back-off efficiency while maintaining the desired harmonic characteristics in both the carrier and peaking amplifiers. The measured results show strong agreement with the simulation results, supporting the validity of the proposed design approach.