In some embodiments of the present invention, a shield is provided wherein the shield comprises a ceramic insulation material. The ceramic insulation material fills the space between the shield and the substrate surface and maintains a gap of less than about 2 mm and advantageously, less than about 1 mm. The shield may further be connected to ground through a low-pass filter operable to prevent the loss of high frequency RF power through the shield to ground but allow the dissipation of charge from the shield to ground through a low frequency or DC signal. In some embodiments, the ceramic insulating material further comprises a removable ceramic insert. The ceramic insert may be used to select the size of the aperture. The ceramic insert further comprises a slot operable to isolate the bottom lip of the ceramic insert from the upper portion for a PVD deposition.