Patent ID: 7453333
Filing Date: 2008-11-18
Classification: H03H

Abstract:
1. A surface acoustic wave apparatus comprising: a piezoelectric substrate on the bottom face of which a first IDT electrode, a second IDT electrode, a ground terminal of the second IDT electrode and an annular ground electrode which encloses the first electrode and the second electrode and is connected to the first IDT electrode to function as a ground terminal of the first IDT electrode are formed; and a base substrate on the top face of which an annular ground conductor corresponding to the annular ground electrode and a ground pad corresponding to the ground terminal of the second IDT electrode are formed, for mounting the piezoelectric substrate thereon so as to be opposed to the face of the piezoelectric substrate on which the IDT electrodes and the like are formed, wherein the annular ground conductor of the base substrate is connected to a first ground conductor which is composed of at least a first bottom face ground conductor layer that is provided on the bottom face of the base substrate, the ground pad of the base substrate is connected to a second ground conductor which is composed of at least a second bottom face ground conductor layer that is provided on the bottom face of the base substrate, and the first ground conductor is electrically separated from the second ground conductor.