Patent ID: 6893533

Claim:
A plasma reactor for use with a supply of RF source power for processing a workpiece, said reactor comprising: a vacuum chamber having a ceiling; a workpiece support pedestal within the chamber facing said ceiling and comprising a top pedestal surface having a diameter similar to a diameter of a workpiece to be supported thereon, said chamber having an axis of symmetry intersecting said ceiling and intersecting said top pedestal surface, said ceiling having a diameter greater than said diameter of said top pedestal surface; a first single solenoidal interleaved coil antenna at least generally coaxial with said axis of symmetry, the entirety thereof overlying an intermediate portion of the ceiling between a periphery of the ceiling and a center of the ceiling, the entirety of said first single solenoidal interleaved coil antenna having a diameter substantially less than the diameter of said top pedestal surface, and comprising a first plurality of conductors wound about said axis of symmetry in respective concentric helical solenoids, said conductors being displaced from said axis of symmetry in a lateral direction uniformly, the conductors being offset from one another in the direction generally of the axis of symmetry, each of said conductors being connected across said supply RF source power; and an outer coil antenna overlying the ceiling and having a lateral extent greater than said first solenoidal interleaved conductor coil antenna, whereby said first solenoidal interleaved conductor coil antenna is an inner coil antenna.