Patent ID: 6508198
Filing Date: 2003-01-21
Classification: H01J

Abstract:
A plasma reactor, comprising:a reactor chamber including a wafer support for holding a semiconductor wafer for processing and a process gas supply inlet; an RF power generator having an output terminal and a return terminal; an inductive antenna comprising a coiled conductor adjacent said reactor chamber having first and second spaced apart ground taps coupled to said return terminal of said generator and an intermediate power input tap between said ground taps, said intermediate tap connected to said output terminal and defining first and second portions of said antenna on respective sides of said intermediate tap; an inductance-suppressing conductive body sufficiently closer to one of said portions of said antenna than it is to the other of said portions to provide greater suppression of the inductance of the one portion and lesser suppression of the inductance of the other portion; and wherein said conductive portion comprises a metal ring at least nearly coaxial with an axis of symmetry of said coiled conductor, said ring having a length along said axis corresponding to an axial length of said one portion of said antenna.