I. Introduction
In a mobile communication network, the power amplifier (PA) alone consumes 22% of the share of the transmitter power [1] and is a critical component to address the energy demands of 5G technology. Harmonic tuning is an attractive way to address this challenge. Typically, high-efficiency class F/F−1 amplifiers can only be achieved over a narrow bandwidth, due to the requirements of their resonator-like harmonic terminations. To address high-frequency dispersion of the matching network over the entire frequency band is more difficult with conventional matching networks and typically involves a tradeoff between , efficiency, and bandwidth. Designing a matching network for higher output powers in a single-stage amplifier is even more challenging because of a lower optimal load line resistance and a larger parasitic output capacitance, which must be canceled out by the matching network. To transform low impedance matching networks to with low loss requires special attention as wider transmission lines increase losses and require more sections for matching.