COMPOSITE SUBSTRATE, ACOUSTIC WAVE ELEMENT, MODULE, AND COMMUNICATION DEVICE

Abstract: a composite substrate includes a piezoelectric layer and a low-acoustic-velocity film. the low-acoustic-velocity film extends along a bottom surface of the piezoelectric layer and has a lower acoustic velocity than the piezoelectric layer. an inverse velocity plane of an acoustic wave propagating through the piezoelectric layer is concave.

Inventor(s): Tomio KANAZAWA

CPC Classification: H03H9/02574 (IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing ; arrangements for producing a reverberation or echo sound ; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, ; control of amplification, e.g. bandwidth control of amplifiers, ; tuning resonant circuits, e.g. tuning coupled resonant circuits, ; networks for modifying the frequency characteristics of communication systems ))

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