Abstract:A GaN broadband high efficiency power amplifier is designed based on the broadband matching network for the requirements of the broadband high efficiency power amplifier, covering the entire S band. Simulation results show that the Drain Efficiency(DE) is better than 62%, the Power Added Efficiency(PAE) is better than 57% and the gain is more than 10.6 dB. And the test results show that the DE is better than 54%, the PAE is better than 48% and the gain is more than 9 dB, the flatness of the gain is less than 1 dB, achieving the design of the broadband high-efficiency power amplifier.