The invention discloses a
broadband matching circuit for improving
harmonic performance, which is connected between a power
amplifier stage and a
signal output end of a power
amplifier. The broadbandmatching circuit comprises a
choking coil, at least two second
harmonic suppression networks which are respectively resonant at different frequency points, at least two
third harmonic suppression networks which are respectively resonant at different frequency points, and a
broadband matching network, wherein the
choking coil is connected between the output end of the power
amplifier stage and a power supply; the at least two second
harmonic suppression networks are respectively connected between the output end of the power amplifier stage and the ground, and the output ends of the at least twosecond harmonic suppression networks are connected to the input end of the
broadband matching network; the at least two
third harmonic suppression networks are respectively connected between the output end of the broadband matching network and the ground, and the output ends of the at least two
third harmonic suppression networks are connected to the
signal output end of the power amplifier. According to the broadband matching circuit, the resonant frequency points of the second harmonic suppression networks and the third harmonic suppression networks can be flexibly controlled, and the efficiency of the power amplifier is improved.