End surface reflection type surface acoustic wave apparatus

摘要

A surface acoustic wave apparatus that is an end surface reflection type surface acoustic wave apparatus includes at least one interdigital transducer provided on a main surface of a piezoelectric substrate, and end surfaces of the piezoelectric substrate are used as reflection end surfaces. The surface acoustic wave apparatus generates and utilizes a surface acoustic wave that has a longitudinal wave or a shear vertical wave as its main component. It is preferred that the shear horizontal wave component and the shear vertical wave component, other than the longitudinal wave component, each occupy no more than about 20% of the total energy strength of the entire excited surface acoustic wave. It is also preferred that the longitudinal wave component occupies about 70% or more of the total energy strength of the entire excited surface acoustic wave. By doing so it is possible to produce an end surface reflection type surface acoustic wave apparatus that can easily provide a desired bandwidth.