Analysis and Design of Stacked-Crystal Filters for Frequency Control and Signal Processing.

摘要

A class of novel frequency-selective devices,called stacked-crystal filters,is discussed in terms of a microwave network approach that leads to a systematic procedure for their analysis and design. These devices consist of two or more crystal plates that are stacked together,with thin electrodes being provided between some or all of the adjacent interfaces for the purpose of translating mechanical properties into electrical signals via piezoelectric coupling. In such a configuration,the electro-mechanical coupling that occurs at the plate surfaces produces selective interactions between the elastic modes in each crystal plate,as well as between these modes and all of the modes in the other plates included in a stack. A judicious combination of materials and dimensions can therefore provide a very wide range of desired filtering characteristics. (Modified author abstract)