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US 5,184,042 AGranted
Surface wave device
AssigneeMurata Manufacturing Co., Ltd.
InventorsMichio Kadota, Kazuhiko Morozumi
Life of this patent
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Abstract
A surface wave device utilizing a surface wave of an SH type whose displacement is mainly displacement in the direction perpendicular to the direction of the surface wave propagation, the above piezoelectric substrate being made of a piezoelectric material whose ratio of the elastic stiffness constant C.sub.33.sup.D to the elastic stiffness constant C.sub.44.sup.E is more than 4.
Claims8
A surface wave device comprising:
- a piezoelectric substrate made of a piezoelectric material;
- and
- electrodes for exciting in said piezoelectric substrate a surface wave of an SH type whose displacement is mainly displacement in the direction perpendicular to the direction of the surface wave propagation,
- said piezoelectric substrate being made of a piezoelectric material whose ratio of the elastic stiffness constant C.sub.33.sup.D to the elastic stiffness constant C.sub.44.sup.E is more than 4.
1 more element
Dependencies are inferred from the claim text.