Design of a new power equalizer

In this paper, a new microstrip power equalizer based on branch resonator loaded resistor is presented. Fourth-order resonance structure is employed to synthesize the frequency response. The equilibrium depth is 12.4dB. For 7.5GHz–18GHz application, the input and output return loss of the power equalizer is greater than 10dB. By changing the characteristic impedance of the main transmission line, which is connected by the resonance branches, we obtain good standing wave ratio. Because no additional matching transformer is needed, the power equalizer is small and easy to be produced. The power equalizer has been widely used in traveling-wave tube amplifiers.