Patent ID: 8564173

Claim:
An elastic wave device comprising: a piezoelectric substrate including a main surface on which an IDT is located and an elastic wave excited by the IDT propagates; and a structure located on a bonding surface of the piezoelectric substrate other than the main surface; wherein the structure is arranged such that a path difference is defined between a first component and a second component of a bulk wave that is excited by the IDT and propagates in the piezoelectric substrate toward the bonding surface, the first component being reflected from the bonding surface, the second component entering the structure from the bonding surface, propagating in the structure, and entering the piezoelectric substrate from the bonding surface, the first and second components propagating in the same direction in the piezoelectric substrate; and the structure is bonded to a side surface of the piezoelectric substrate located between an outer periphery of the main surface and an outer periphery of the other main surface opposing the main surface.