Patent ID: 6516742
Filing Date: 2003-02-11
Classification: H01J,H05H

Abstract:
A plasma reactor, comprising:an electromagnetic energy source; a radiator operatively coupled to the electromagnetic energy source by first and second variable impedance networks, wherein the radiator, the electromagnetic energy source, the first variable impedance network and the second variable impedance network are coupled in series; a chamber having a window that is proximate to the radiator; and a shield, positioned between the radiator and the window, substantially covering a surface of the radiator near the window; wherein a portion of the radiator that is not covered by the shield is proximate to a conductive wall of the chamber; and wherein the first variable impedance network includes a first variable capacitor and a fixed capacitor serially connected between the electromagnetic energy source and the radiator, and further includes a shunt variable capacitor having a first plate connected between the electrical connection between the first variable capacitor and the fixed capacitor, and having a second plate connected to ground.