Design of Broadband Power Amplifier Based on Loop-shaped Filter Matching Structure

A method for designing a broadband high-efficiency power amplifier (PA) based on a novel loop-shaped filter matching structure is proposed in this paper. By combining a power amplifier matching circuit and a loop-shaped filter structure, a broadband high-efficiency PA based on a new harmonic matching structure is realized. The novel loop-shaped filter can control the second and third harmonics in a wide frequency range and has a specific control effect on higher-order harmonics, which can further expand the bandwidth of class-F PA and improve efficiency. To verify its feasibility, a power amplifier with a bandwidth of 1.6 GHz-3.4 GHz, a saturated output power greater than 41 dBm, a drain efficiency of 65%-72% with a gain greater than 10dB is designed and fabricated using GaN HEMT CGH40010F transistor.