Energy trapping in bulk acoustic wave composite resonator

The analytical approach to the problem of energy trapping in bulk acoustic wave composite resonators is developed. It is based on a standard system of wave equations and boundary conditions for adjacent to resonator three layer structure-relatively thick layer of the substrate, thin metal electrode...

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Main Author: Mansfeld, G.D
Format: Conference Proceeding
Language:English
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Acoustic wave devices
Microwave circuits and devices
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description The analytical approach to the problem of energy trapping in bulk acoustic wave composite resonators is developed. It is based on a standard system of wave equations and boundary conditions for adjacent to resonator three layer structure-relatively thick layer of the substrate, thin metal electrode deposited onto its surface and the layer of piezoelectric film. The dispersion equation is solved to find small components of the wave vector in the direction in the plane of the structure outside the resonator. The obtained formula describes the attenuation of the wave in the region close to resonator. This expression is purely analytic and does not require matching procedure in calculations. The situation corresponding to microwave bulk acoustic wave resonators structures is discussed. In particular the developed approach at least qualitively explains surprisingly perfect energy trapping which exists in almost all microwave composite resonators.
doi_str_mv 10.1049/cp:19960004
format conference_proceeding
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ispartof 10th International Conference on European Frequency and Time, 1996, p.21-24
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subjects Acoustic wave devices
Microwave circuits and devices
title Energy trapping in bulk acoustic wave composite resonator
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