Patent ID: 7855620

Claim:
A filter circuit device passing through a desired frequency band, comprising: a resonator unit configured with six or more resonators having ordered resonance frequencies respectively, the resonators being divided into a plurality of resonator groups, each resonator group including one or more resonators of the resonators connected in parallel, one resonator group of the resonators having different odd-numbered resonance frequencies, respectively, and another resonator group of the resonators having different even-numbered resonance frequencies, respectively, the resonators of each of the resonator groups having two or more different coupling factors, respectively; a delay unit including a plurality of delay circuits each connected in cascade with the corresponding one of the resonator groups, each of the delay circuits being connected in common to the resonators of a corresponding one of the resonator groups, the delay circuits respectively including one or more delay circuits indicating different electric lengths with respect to the different odd-numbered resonance frequencies, respectively, and one or more delay circuits indicating different electric lengths with respect to the different even-numbered resonance frequencies, respectively; a power dividing unit configured to divide a power to the resonators; and a plurality of power combining units provided for the first resonator group and the second resonator group, respectively, one of the plurality of power combining units combines outputs of the resonators of one of the resonator groups and another of the plurality of power combining units outputs of the resonators of another of the resonator groups, the phase difference being made between the resonator groups by the delay unit, wherein the resonators having the ordered resonance frequencies respectively are divided into three or more resonator groups each having one or more resonators without mixing the resonators having the odd-numbered resonance frequencies and the resonators having the even-numbered resonance frequencies, the resonators of each group of the resonator groups are connected in parallel in the group, and connected in cascade to the delay unit.