Patent ID: 6878249

Claim:
A high frequency sputtering device, comprising: a processing chamber having an axially extending side wall; a high frequency power supply; a cathode inside the processing chamber, the cathode being electrically insulated from the processing chamber and connected to the high frequency power supply, the cathode extending only along a given axial extent of the side wall of the processing chamber; a target mounted on a first side of the cathode; and a grounded metal shield mounted in the processing chamber adjacent to the cathode but only in a location outside of the given axial extent of the cathode, the metal shield having an opening in a central portion thereof, wherein an outer circumferential edge of the metal shield is electrically grounded to the processing chamber; the processing chamber, cathode, and the grounded metal shield are arranged such that only a dielectric material is between the cathode and the wall of the processing chamber within the axial extent of the cathode; the metal shield is arranged so as to form a gap having a first portion between the metal shield and the cathode and a second portion between the metal shield and the target, wherein the gap is sufficiently narrow and sufficiently long so as to substantially prevent plasma from passing through the gap, wherein the gap includes a bend between the first portion and the second portion so that the gap is substantially L-shaped.