ELASTIC WAVE DEVICE, FILTER DEVICE, COMMUNICATION MODULE AND COMMUNICATION APPARATUS

摘要

An elastic wave device including a piezoelectric substrate, comb-like electrodes formed on the piezoelectric substrate, and a dielectric layer formed on the piezoelectric substrate. The dielectric layer formed on the piezoelectric substrate covers the comb-like electrodes and the thickness of the dielectric layer formed on the piezoelectric substrate is larger than the sum of the thickness of the comb-like electrodes and the thickness of the dielectric layer formed on the comb-like electrodes.