Patent ID: 6998940
Filing Date: 2006-02-14
Classification: H03H,Y10T

Abstract:
1. A component operating with bulk acoustic waves, said component comprising: a carrier substrate; a lower electrode that faces said carrier substrate; an upper electrode; a piezoelectric layer between said lower electrode and said upper electrode, said piezoelectric layer comprising a multi-layer assembly; and an acoustic mirror between said carrier substrate and said lower electrode, said acoustic mirror comprising at least one layer with a high acoustic impedance and at least one layer with low acoustic impedance arranged in a stack, said at least one layer of low acoustic impedance including an uppermost mirror layer of said stack, said at least one layer with high acoustic impedance being formed as a structured layer, said uppermost mirror layer exhibiting a varying thickness, an upper boundary surface of said uppermost mirror layer being planar to said lower electrode, and said uppermost layer enclosing a structure of said structured layer and forming a seal with a layer of said at least one layer with a low acoustic impedance or with said carrier substrate outside of an area covered by said structure.