A method includes affixing a capacitor sheet adjacent to core material of a device substrate, where the capacitor sheet covers a surface of the core material. The method also includes patterning first openings through both capacitor sheet and the core material, where the first openings are larger than a substrate pass through-hole. The method additionally includes filling the first openings with an electrically inert material. The method further includes patterning a second openings parallel to the first openings through the electrically inert material, where the second openings are at least as large as the substrate pass through-hole and having sidewalls enclosed within the electrically inert material.