PURPOSE: To achieve wide band, by connecting an LC resonance circuit to an input terminal of the Wilkinson type power distributor.

CONSTITUTION: To an input of a Wilkinson type power distributor 1, a series resonance circuit 4 consisting of an inductance Lo and a capacitance Co is connected. Further, capacitors C1∼C5 are used for frequency characteristics correction. Moreover, the constant for the resonance circuit 4 is set so that the resonant point is taken near the center frequency f0 of an input signal. With the constitution like this, the isolation and VSWR characteristics show a double peak characteristic centering to the frequency f0, enabling to achieve wide band.