Patent ID: 6873112
Filing Date: 2005-03-29
Classification: H01J,H01Q

Abstract:
1. A method, for processing a substrate, comprising: placing the substrate in a processing chamber, wherein the processing chamber comprises a substrate holder within the processing chamber and a dielectric window forming a side of the processing chamber, wherein an antenna is disposed outside the chamber adjacent to the dielectric window; providing a processing gas into the chamber; using the antenna to generate an azimuthally symmetric electric field, wherein the antenna comprises an outer loop, comprising a first outer loop turn disposed around an antenna axis, inner loop, comprising a first inner loop turn disposed around the antenna axis, wherein the inner loop turn is closer to the antenna axis than the first outer loop turn is to the antenna axis in each azimuthal direction, and a radial connector radially electrically connecting the outer loop to the inner loop, wherein the radial connector is placed a large distance from the window to provide a more uniform electric field; forming a substantially azimuthally symmetric plasma from the processing gas using the azimuthally symmetric electric field; and producing a substantially uniform process rate across a surface of a substrate.