Patent ID: 11870414
Assignee: WISOL CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A film bulk acoustic resonator (FBAR) chip and package structure with an improved temperature coefficient, comprising:
a plurality of FBARs located on a central area of one surface of a substrate and each having a bottom electrode, a piezoelectric material, and a top electrode; and
a temperature compensation layer formed outside each of the plurality of FBARs around the central area of one surface of the substrate,
wherein the temperature compensation layer is formed on the substrate to completely surround the central area of one surface of the substrate,
wherein the temperature compensation layer comes into contact with the piezoelectric materials of the FBARs in such a manner as to be formed on the outsides of the piezoelectric materials,
wherein when viewed on top of the substrate, the boundary line between the temperature compensation layer and the piezoelectric materials is formed linearly or archedly, with no concave/convex shape.