Patent ID: 7395779

Claim:
A plasma processing apparatus comprising a susceptor having a surface for placing a target object, wherein said surface of the susceptor is planar, a processing vessel in which said susceptor is arranged, a slot antenna opposed to said susceptor to supply an electromagnetic field into said processing vessel, and a first dielectric member opposed to a radiation surface of said slot antenna, wherein said first dielectric member is parallel with said surface of the susceptor, characterized in that said slot antenna comprises a first conductive plate constituting said radiation surface, wherein said first conductive plate is nonparallel with said surface of the susceptor, a second conductive plate arranged on a side opposite to said susceptor when seen from said first conductive plate, wherein said second conductive plate is parallel with said surface of the susceptor, an inlet port formed at a central part of said second conductive plate for introducing said electromagnetic field into a space between said first conductive plate and second conductive plate, and a plurality of slots formed in said first conductive plate so that said electromagnetic field introduced from said inlet port propagates from a central part of said space to a peripheral part and leaks out gradually in said processing vessel.