BOUNDARY ACOUSTIC WAVE DEVICE

摘要

A boundary acoustic wave device capable of providing good resonance characteristics and filter characteristics, and reducing an insertion loss. A boundary acoustic wave device comprising an inter-digital electrode (4) and/or a reflectors (5, 6) disposed at the interface between an LiNbO3 substrate (2) as a first medium layer and an SiO2 film (3) as a second medium layer, wherein 0.54 < d < 0.89 is satisfied when the duty ratio of the inter-digital electrode (4) and/or a reflectors (5, 6) is d.