Piezoelectric resonator filter

摘要

A piezoelectric resonator filter for allowing a high-frequency signal in a desired frequency band to pass therethrough. The piezoelectric resonator filter presents a low insertion loss while securing satisfactory characteristics in a stop band. The piezoelectric resonator includes two or more reactance elements in serial connection between input and output terminals, at least three or more piezoelectric resonators in parallel connection between the input and output terminals, and an inductor having a grounded end. The reactive elements and resonators of the piezoelectric resonator are arranged in a ladder connection. Among the three or more piezoelectric resonators, only those piezoelectric resonators which do not adjoin each other are connected in common to the inductor.