Patent ID: 7301420

Claim:
A piezoelectric resonator filter for allowing a high-frequency signal in a desired frequency band to pass therethrough, the piezoelectric resonator filter comprising: three or more reactance elements in serial connection between an input terminal and an output terminal; and at least four or more piezoelectric resonators in parallel connection between the input terminal and the output terminal, the three or more reactance elements and the four or more piezoelectric resonators being disposed in a ladder connection, wherein among the four or more piezoelectric resonators, at least two non-adjoining piezoelectric resonators are included in a filter group, the at least two non-adjoining piezoelectric resonators in the filter group share a common electrode which is connected to a first inductor component, the common electrode being opposite to electrodes which are connected to the three or more reactance elements, and the first inductor component and at least one piezoelectric resonator not included in the filter group are grounded via a second inductor component.