High Efficiency Harmonic Suppression Power Amplifier Design Across Quadrature Frequencies

Power amplifiers play a crucial role in current wireless communication systems, where harmonic suppression has always been a key design challenge. In this paper, a harmonic suppression network is designed with an Elliptic low-pass filter prototype, which is capable of achieving harmonic suppression up to four times the frequency. The design improves the efficiency of the power amplifier to a certain extent and provides a great advantage in frequency coverage. Simulation results show that the power amplifier has a gain of more than 10.4 dB in the frequency band from 0.4 GHz to 1.6 GHz, with a maximum gain of up to 14.1 dB, and the efficiency is maintained at more than 60%, with the maximum efficiency able to reach 81.67% and the saturated output power is 39.5-42.4 dBm. The structure not only effectively suppresses harmonics, but also realizes high-efficiency power amplification in P-band and L-band. The amplifier structure designed in this paper is of great significance for wireless communication, aviation radio navigation and water mobility.