Patent ID: 6674215
Filing Date: 2004-01-06
Classification: H03H

Abstract:
An acoustic wave apparatus comprising:a piezoelectric substrate mainly containing lithium tantalate; an interdigital transducer including a conductor formed on said substrate; and a reflector including a conductor formed on said substrate, wherein a surface rotated in a range of 34Â° to 41Â° from a crystal Y axis around a crystal X axis of the lithium tantalate is set as a surface of said substrate, a standardized electrode thickness (h/&lgr;) obtained by standardizing a thickness h of an electrode finger constituting at least a part of said reflector by a wavelength &lgr; of a surface acoustic wave is set in a range of 0.01 to 0.05, and a duty ratio (w/p) of the electrode finger decided based on a width w and an arraying cycle p of the electrode finger is set to the value ranging from 0.6 to just below 1.0.