ELASTIC WAVE DEVICE

摘要

Provided is an elastic wave device by which higher mode spurious can be suppressed and excellent filter characteristics can be obtained. In an elastic wave device (1), a first dielectric layer (4) is laminated on a piezoelectric substrate (2), and an electrode structure (3) is formed on the interface between the piezoelectric substrate and the first dielectric layer. The electrode structure (3) has a first electrode structure (3A) which configures an elastic wave filter, and a second electrode structure (3B) which configures elastic wave resonators (16, 22). The elastic wave resonators are electrically connected to the elastic wave filter, and the antiresonant frequency at which the impedance of the elastic wave resonators (16, 22) indicate the extreme value is set within the frequency range wherein the higher mode spurious of the elastic wave filter appears.