Patent ID: 7867908
Filing Date: 2011-01-11
Classification: H01L,H05K

Abstract:
1. A method of fabricating a substrate, comprising: providing a metallic panel having a first surface and a second surface; performing a first half-etching process to etch a region of the first surface of the metallic panel to a first depth and form a first patterned metallic layer on the first surface; depositing a first insulating material into gaps within the first patterned metallic layer to form a first insulator; and performing a second half-etching process to etch a region of the second surface of the metallic panel to a second depth and expose at least a portion of the first insulator such that a second patterned metallic layer is formed on the second surface, wherein a sum of the first depth and the second depth together equals a thickness of the metallic panel, wherein the first half-etching process and the second half-etching process just etch the regions of the first surface and the second surface without reducing the metallic panel in thickness.