HARMONIC FILTER FOR RF AMPLIFIER

An RF amplifier includes a harmonic filter with a plurality of shunt filter legs. The harmonic filter provides a suppressing frequency range for a harmonic frequency of a carrier frequency in a range of carrier frequencies. Each of the shunt filter legs includes capacitor, inductor, and a node coupled between the capacitor and inductor. Each node of the shunt filter leg is coupled to at least one other node of another shunt filter leg of the filter with a resistive element. The harmonic filter includes a first shunt filter leg that has a resonant frequency between the center frequency and (1/1.220) times the center frequency and a second shunt filter leg that has a resonant frequency between the center frequency and 1.220 times the center frequency.