Patent ID: 8742666

Claim:
A filter for filtering radio frequency (RF) power transmitted from an electrostatic chuck (ESC) in a plasma processing system, said plasma processing system including a first heating element disposed at a first portion of said ESC, said plasma processing system further including a power supply, said filter comprising: a first core member; a first plurality of capacitors, said first plurality of capacitors including at least a first capacitor and a second capacitor; and a first cable wound around and wound along at least a first portion of said first core member to form at least a first set of inductors having a first set of inductances, said first cable including at least a first plurality of wires, said first plurality of wires including at least a first wire and a second wire, said first wire contacting said second wire, at least a portion of said first wire and at least a portion of said second wire being twisted together, a first end of said first wire being connected to said first heating element, a second end of said first wire being connected to said first capacitor and being connected to said power supply; a first end of said second wire being connected to said first heating element, a second end of said second wire being connected to said second capacitor and being connected to said power supply; wherein said first core member includes at least a groove structure, at least a portion of said first cable being disposed inside said groove structure and wherein said groove structure includes at least a plurality of groove portions, said groove structure having various pitches between neighboring groove portions of said plurality of groove portions such that a first portion of said first cable forms a first subset of inductors having a first subset of inductances and that a second portion of said first cable forms a second subset of inductors having a second subset of inductances, said second subset of inductances being different from said first subset of inductances such that said first cable and said first plurality of capacitors are sufficient for blocking RF power at two different frequencies.