Patent ID: 7780814
Filing Date: 2010-08-24
Classification: H01J

Abstract:
1. A plasma reactor for processing a workpiece, comprising: a reactor chamber having a wafer support pedestal within the chamber and process gas injection apparatus; an RF bias power generator coupled to said wafer support pedestal and having a bias frequency; a source power applicator; an RF source power generator having a source frequency; a coaxial cable coupled between said RF source power generator and said source power applicator; and a filter connected at a node between said coaxial cable and said source power applicator, said filter comprising: (a) a set of plural reflection circuits connected in parallel to said node, a first one of said plural reflection circuits tuned to said bias frequency, a second one of said plural reflection circuits tuned to one intermodulation product of said bias frequency and said source frequency, a third one of said plural reflection circuits tuned to an other intermodulation product of said bias frequency and said source power frequency, wherein the first one, the second one and the third one of the plural reflection circuits are different from each other; (b) a set of plural trap circuits connected in parallel to said node and coupled to ground, a first one of said plural trap circuits tuned to a second harmonic of said bias frequency, a second one of said plural trap circuits tuned to one intermodulation product of said second harmonic of said bias frequency and said source frequency, a third one of said plural trap circuits tuned to an other intermodulation product of said second harmonic of said bias frequency and said source power frequency, wherein the first one, the second one and the third one of the plural trap circuits are different from each other.