Patent ID: 9394163
Filing Date: 2016-07-19
CPC Classification: B81C,H03H

Claim Text:
1. A method for producing a dielectric layer on a surface of a component, the surface having a first topography with elevated structures, the method comprising: forming a dielectric layer over the structures over an entire area of the first topography, such that the surface of the dielectric layer has a second topography, wherein forming the dielectric layer comprises forming a silicon dioxide layer, wherein the component comprises a piezoelectric layer on a substrate or a piezoelectric substrate and also comprises an electrode structure disposed above a surface of the substrate that forms the first topography, the electrode structure is configured to excite acoustic waves in the component, wherein the dielectric layer is in direct contact with the structures and encapsulates all exposed surfaces of all the structures across the substrate, forming a polymer layer having a planar surface over the dielectric layer over the entire area, performing an etching method, wherein a desired etching rate ratio of dielectric layer to resist layer is set, continuing the etching method until a surface of the dielectric layer has a desired third topography after complete removal of the resist layer; forming a trimming layer having a higher stiffness than a stiffness of the dielectric layer, the trimming layer formed on the dielectric layer over the third topography; and reducing a thickness of the trimming layer until a predefined center frequency of the combined dielectric layer and trimming layer is attained.