Elastic boundary wave device

Details Elastic boundary wave device Elastic boundary wave device

2007-01-19

2008-08-12

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C310S31300R, C310S31300R, C310S346000

Reexamination Certificate

active

07411473

ABSTRACT:
An elastic boundary wave device includes an IDT including laminated conductor layers disposed between a first medium and a second medium, wherein a plane that divides the IDT in half in the thickness direction defines an interface, the energy of an elastic boundary wave present on the side of the first medium of the interface is denoted as E1, and the energy of an elastic boundary wave present on the side of the second medium of the interface is denoted as E2, and wherein if the IDT included only a conductor having the highest density among the laminated conductor layers of the IDT, when the energy of an elastic boundary wave present on the side of the first medium of the interface is denoted as E1′ and the energy of an elastic boundary wave present on the side of the second medium of the interface is denoted as E2′, the energies of an elastic boundary wave would satisfy the relationship of E1/E2<E1′/E2′ so that the sonic velocity of an elastic boundary wave in the IDT including the laminated conductor layers is equal to the sonic velocity of an elastic boundary wave if the IDT included only the conductor layer having the highest density.

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