Patent ID: 6322662
Filing Date: 2001-11-27
Classification: H01J,H05H

Abstract:
A plasma treatment system comprising:an airtight treatment vessel housing therein a mounting table for mounting thereon an object to be treated;a microwave generating device for generating a microwave;a microwave introducing device for introducing said microwave into said treatment vessel; anda flat antenna member which is connected to said microwave introducing device and which faces said mounting table, said flat antenna member having a plurality of slots in a region other than a central portion of said flat antenna member, said slots being arranged so as not to be axisymmetric with respect to an axis passing through the center of said flat antenna member, a slot space for two of said slots being shorter than a wavelength of said microwave in said microwave introducing device, and each of said slots having a length shorter than half of said wavelength,wherein said slots are arranged so that a normal line of each of said slots does not pass through said central portion of said flat antenna member and said slots are arranged on and perpendicular to a plurality of straight lines which are imaginatively formed on a plane of said flat antenna member and which do not pass through said central portion of said flat antenna member.