Structure of acoustic wave filter

Abstract

A structure of an acoustic wave filter includes: parallel resonators and series resonators, where the parallel resonators and the series resonators are cascaded; each of the parallel resonators includes a first supporting substrate, a first piezoelectric thin film, and a first electrode array; the first piezoelectric thin film is disposed on the first supporting substrate, and the first electrode array is disposed on the first piezoelectric thin film; the first electrode array includes a first interdigital electrode array and a first reflection grating array; and a quantity of pairs of first reflection gratings of at least one of the parallel resonators is less than or equal to a first preset threshold, and the first preset threshold is less than 5. The present disclosure can effectively suppress a fluctuation in a passband while ensuring high performance of the filter.

Dependencies are inferred from the claim text.