An apparatus for providing a return current path for RF current between a chamber wall and a substrate support is provided comprising a low impedance flexible curtain having a first end and a second end, the first end adapted to be electrically connected to the chamber wall and the second end adapted to be connected to the substrate support, wherein the curtain further comprises at least one foldin the curtain material, located an axial distance between the first end and the second end, and at least one perforation cut into the curtain proximate the second end.