Patent ID: 9287849
Filing Date: 2016-03-15
CPC Classification: H03H

Claim Text:
1. An elastic wave device comprising: a piezoelectric substrate; a high-frequency filter formed on the piezoelectric substrate having a high-frequency passband; and a low-frequency filter formed on the piezoelectric substrate having a low-frequency passband lower than the high frequency passband, the low-frequency filter including a first elastic wave resonator, the first elastic wave resonator having a plurality of interdigital transducers disposed between a pair of reflectors, at least one reflector of the pair of reflectors having a first region and a second region, the second region having a third region and a fourth region, the first region located nearer to the plurality of interdigital transducers than the second region, the third region located nearer to the plurality of interdigital transducers than the fourth region, a reflection band in the first region covering the low-frequency passband, a reflection band in the second region covering the high-frequency passband, and a center frequency of a reflection band in the fourth region being lower than a center frequency of a reflection band of the third region.