Patent ID: 7629866
Filing Date: 2009-12-08
Classification: H03H,Y10T

Abstract:
1. A surface acoustic wave device comprising: a piezoelectric substrate including a recessed portion in one principal surface thereof and a groove having a planar shape corresponding to a shape of an IDT electrode provided in the recessed portion; an IDT electrode embedded in the groove; a cover member bonded to the one principal surface of the piezoelectric substrate; an air gap provided in the recessed portion such that the IDT electrode faces the air gap; a through-hole electrode provided in one of the piezoelectric substrate and the cover member, and being electrically connected to the IDT electrode; and a terminal electrode provided in one of the piezoelectric substrate and the cover member, that is electrically connected to the through-hole electrode, and that is arranged so as to be electrically connected to an external device.