The Design of Coaxial Microwave Amplitude Equalizer

The amplitude frequency characteristic curve of microwave power amplifier is nonuniformity in its frequency band. To improve the flatness and the stability of the transmission characteristic, a method is presented in this paper that is to place a microwave amplitude equalizer in the output port of an amplifier. With the help of HFSS (high frequency structure simulator), the modeling, simulation and optimization for a given equalizing curve are completed. The simulation results of the transmission characteristic and VSWR (voltage standing wave ratio) show that the designed coaxial resonator has advantages of simple-structured and easy-debugging, and the designed equalizer may preferably compensate for the amplitude distortion of the amplifier.