PIEZOELECTRIC RESONATOR FILTER

摘要

The present invention is directed to a piezoelectric resonator filter for allowing a high-frequency signal in a desired frequency band to pass therethrough, including: two or more reactance elements in serial connection between input and output terminals; at least three or more piezoelectric resonators (12a-12d) in parallel connection between the input and output terminals; and an inductor (13a) having a grounded end. Among the three or more piezoelectric resonators, only those piezoelectric resonators which do not adjoin each other in the equivalent circuit are connected in common to the inductor.