Workpiece processing chamber having a rotary microwave plasma antenna with slotted spiral waveguide
First Claim
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1. A reactor for processing a workpiece comprising:
- a chamber and a workpiece support surface in said chamber;
a rotary coupling comprising a stationary stage and a rotatable stage having an axis of rotation;
a microwave source coupled to said stationary stage;
a rotation actuator;
a microwave antenna coupled to said rotation actuator and overlying said chamber, said microwave antenna comprising;
a floor and a ceiling defining a planar region therebetween;
a first spiral wall extending between said floor and said ceiling and having a spiral axis corresponding to said axis of rotation, said first spiral wall defining a first spiral conduit that spirals radially inwardly making at least a revolution around said spiral axis in the planar region from a first conduit end to a second conduit end such that microwave energy fed into said first spiral conduit flows azimuthally in the planar region through the first spiral conduit;
first plural ports in said floor spaced apart along the length of said first spiral conduit;
a distributor waveguide positioned above the ceiling and comprising an input and a first output coupled to said first spiral conduit; and
an axial conduit coaxial with the axis of rotation, said axial conduit having a lower end coupled to the input of the distributor waveguide and an upper end coupled to said rotatable stage and configured to receive microwave energy from the microwave source through the rotary coupling while the rotation actuator causes the microwave antenna including the floor, ceiling, distributor waveguide and axial conduit to rotate.
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Abstract
A microwave antenna includes a first spiral conduit having a first conduit end, first plural ports in a floor of the first spiral conduit spaced apart along the length of the first spiral conduit; an axial conduit coupled to a rotatable stage; and a distributor waveguide comprising an input coupled to the axial conduit and a first output coupled to the first conduit end.
16 Citations
21 Claims
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1. A reactor for processing a workpiece comprising:
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a chamber and a workpiece support surface in said chamber; a rotary coupling comprising a stationary stage and a rotatable stage having an axis of rotation; a microwave source coupled to said stationary stage; a rotation actuator; a microwave antenna coupled to said rotation actuator and overlying said chamber, said microwave antenna comprising; a floor and a ceiling defining a planar region therebetween; a first spiral wall extending between said floor and said ceiling and having a spiral axis corresponding to said axis of rotation, said first spiral wall defining a first spiral conduit that spirals radially inwardly making at least a revolution around said spiral axis in the planar region from a first conduit end to a second conduit end such that microwave energy fed into said first spiral conduit flows azimuthally in the planar region through the first spiral conduit; first plural ports in said floor spaced apart along the length of said first spiral conduit; a distributor waveguide positioned above the ceiling and comprising an input and a first output coupled to said first spiral conduit; and an axial conduit coaxial with the axis of rotation, said axial conduit having a lower end coupled to the input of the distributor waveguide and an upper end coupled to said rotatable stage and configured to receive microwave energy from the microwave source through the rotary coupling while the rotation actuator causes the microwave antenna including the floor, ceiling, distributor waveguide and axial conduit to rotate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A microwave antenna for a workpiece processing reactor, comprising:
- a floor and a ceiling defining a planar region therebetween;
a plurality of spiral walls defining a plurality of spiral conduits and extending between said floor and said ceiling, wherein each spiral conduit of the plurality of spiral conduits spirals radially inward in the planar region about making at least a revolution around a spiral axis from a first conduit end to a second conduit end such that microwave energy fed into each spiral conduit flows azimuthally in the planar region; plural ports in said floor spaced apart along the length of each spiral conduit; an axial conduit that is coaxial with the spiral axis; and a distributor waveguide positioned between the ceiling and the axial conduit and comprising an input located at the spiral axis and coupled to said axial conduit, a plurality of waveguide chamber portions extending linearly and radially outward from the input, and a plurality of outputs positioned at radially outward ends of the waveguide chamber portions, each respective output of the plurality of outputs coupled to a respective spiral conduit from the plurality of spiral conduits at a position radially outward of the spiral axis. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- a floor and a ceiling defining a planar region therebetween;
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19. A reactor comprising:
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a workpiece processing chamber; a first planar spiral waveguide conduit overlying said workpiece processing chamber and having a spiral axis and a first conduit end, said first planar spiral waveguide conduit spiraling radially inward from the first conduit end and making at least a revolution around said spiral axis such that microwave energy fed into the first spiral conduit flows azimuthally through the first spiral conduit; first plural ports in said first spiral waveguide conduit facing said workpiece processing chamber and spaced apart along the length of said first spiral waveguide conduit; an axial conduit configured to receive microwave energy; and a distributor waveguide comprising an input coupled to output of said axial conduit and a first output coupled to said first conduit end of said first planar spiral waveguide. - View Dependent Claims (20, 21)
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Specification