Patent ID: 6910440

Claim:
A plasma processing apparatus comprising: a processing container for processing an object to be processed in plasma; a dielectric body to cover an upper opening of the processing container in an airtight manner; a microwave supplier for supplying a microwave, positioned over the dielectric body; a waveguide having a first end connected to the microwave supplier, and extending toward the dielectric body to propagate the microwave to the dielectric body; a waveguide box connected to a second end of the waveguide and extending in form of a flange so as to propagate a microwave from the second end of the waveguide radially outward; an antenna covering a lower opening of the waveguide box and arranged along the dielectric body, the antenna having a plurality of slots formed therein; and a bump made of a conductor arranged at a central part of the antenna inside the waveguide box, the bump projecting toward an opening of the second end of the waveguide.