Patent ID: 7411473
Filing Date: 2008-08-12
Classification: H03H

Abstract:
1. An elastic boundary wave device comprising: a first medium having a positive temperature coefficient of delay in a propagation direction of an elastic boundary wave; a second medium having a negative temperature coefficient of delay in a propagation direction of an elastic boundary wave; and an IDT including laminated conductor layers disposed between the first medium and the second medium; wherein a lamination direction of the first medium and the second medium is the thickness direction of the IDT, a plane that divides the IDT in half in the thickness direction defines an interface, energy of an elastic boundary wave present on the first medium side of the interface is denoted as E if the IDT included only of a conductor layer of a single metal having the highest density among the laminated conductor layers of the IDT, when the energy of an elastic boundary wave present on the first medium side of the interface is denoted as E