Patent ID: 7083701

Claim:
A plasma processing apparatus, comprising: a processing vessel defined by an outer wall and having a stage for holding a substrate to be processed; an evacuation system coupled to said processing vessel; a plasma gas supplying part supplying plasma gas to said processing vessel; and a microwave antenna provided on said processing vessel in correspondence to said plasma gas supplying part and supplied with an electric power from a coaxial waveguide, wherein said microwave antenna comprises: a radial line back surface metal plate having openings; a microwave radiation surface provided on said radial line back surface metal plate so as to cover said openings and having a plurality of slots; and a dielectric plate provided between said radial line back surface metal plate and said microwave radiation surface, wherein said microwave radiation surface is formed by an electrically conductive material, wherein a difference in a coefficient of thermal expansion between said dielectric plate said electrically conductive material within 10% with respect to a coefficient of thermal expansion of said dielectric plate; wherein said dielectric plate is formed of alumina ceramics, and said microwave radiation surface is formed of an alloy of Cu and W.