Patent ID: 9647196
Date: 2017-05-09
CPC Classifications: B81B,B81C,H01L,H03H,Y10T

Claim:
1. A wafer-level package for an electrical component comprising: a first piezoelectric wafer comprising first component structures on a first surface; a second piezoelectric wafer comprising second component structures; a metallic frame structure connected to the first surface of the first wafer and a first surface of the second wafer such that a hermetically sealed cavity enclosed by the frame structure is formed between the first and second wafers; electrical connections on a second surface of the second wafer that faces away from the cavity; pillar-type electrical connections supported within the cavity on the first and second wafers and electrically connected to the first component structures and/or the second component structures; contact pads within the cavity on the first surface of the first wafer and the first surface of the second wafer; an irregular pattern of pillars arranged on a second surface of the first wafer, the second surface of the first wafer facing away from the first surface of the first wafer, wherein the irregular pattern of pillars is configured to dampen acoustic waves; and a shielding layer formed over the pillars, wherein the first component structures and the second component structures are enclosed within the cavity and are connected to the electrical connections via plated through-holes through the second wafer, wherein all the plated through-holes end either on the frame structure, on a pillar connection or on a contact pad, without violating a hermeticity of the cavity, wherein the frame structure, the pillar connections and the contact pads substantially consist of copper, wherein the first component structures operate with surface acoustic waves and are embodied as an SAW filter, and wherein the second component structures comprise transducers for surface acoustic waves and/or passive components selected from inductances and capacitances.