ACOUSTIC MULTILAYER FILM, HIGH FREQUENCY FILTER DEVICE, AND BULK ACOUSTIC WAVE FILTER DEVICE

Abstract: a stress-relaxed acoustic multilayer film, and a high frequency filter device using such a stress-relaxed acoustic multilayer film are provided. the acoustic multilayer film includes two or more pairs of a first layer and a second layer, the first layer having a first specific acoustic impedance, the second layer having a specific acoustic impedance lower than the first specific acoustic impedance, and the first layer and the second layer being alternately laminated on a support substrate, wherein at least one of the first layers of the acoustic multilayer film is divided in a laminated direction by a dividing layer.

Inventor(s): Yuzuki AOKI, Daisuke NAKAMURA, Gaku TSUBURAOKA, Manami KUROSE, Hironobu MACHINAGA

CPC Classification: H03H9/02133 (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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