LADDER TYPE PIEZOELECTRIC FILTER

摘要

PROBLEM TO BE SOLVED: To provide a ladder type piezoelectric ceramic filter less in number of components, small in size, thin in thickness and stable in characteristic, that can be assembled simply in one direction without changing a support position of a vibrator against a shock. SOLUTION: The ladder type piezoelectric filter includes at least three piezoelectric vibrators where the piezoelectric vibrators 19 corresponding to a series element and a parallel element are alternately arranged on a flat substrate, at least part of lower electrodes of the piezoelectric vibrators has a projection 20 and the projection is adhered and fixed to an electrode pattern 18 on a mounting member.