Patent ID: 7723637
Filing Date: 2010-05-25
Classification: H01J,H05H

Abstract:
1. A plasma processing apparatus, comprising a container in which plasma is to be excited, a microwave feeding system for feeding microwave necessary to excite plasma in said container, at least one waveguide coupled to said microwave feeding system and having at least one slot to partially form an opening, and a dielectric plate for propagating the microwave emitted through the slot to the plasma, wherein: said waveguide is a rectangular waveguide, said slot is provided on the H surface of a wider wall of said waveguide, a longitudinal direction of said slot runs substantially parallel to a longitudinal direction of said waveguide, and a length in a longitudinal direction of said slot is longer than a wavelength of the microwave propagated in said waveguide, and a plurality of variable couplers is provided in said waveguide along a longitudinal direction of said waveguide.