| CPC H03H 9/568 (2013.01) [H03H 9/542 (2013.01)] | 10 Claims |
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1. An acoustic wave filter comprising:
a plurality of first series resonators connected in series between a first port and a second port;
a plurality of shunt resonators, each shunt resonators being connected between a different node disposed between the first port and the second port and the ground;
at least one second series resonator connected in parallel to at least one of the first series resonators; and
an inductor connected between one of the shunt resonators and the ground,
wherein a resonant frequency of the at least one second series resonator and a resonant frequency of at least one of the first series resonators are set so that an active area of the at least one second series resonator and an active area of the at least one of the first series resonators do not overlap, the active area representing an area between a resonance point and an anti-resonance point of a corresponding resonator,
wherein a resonant frequency of the shunt resonator connected to the inductor is the same as a resonant frequency of at least one of the plurality of first series resonators.
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