Patent ID: 11972930
Assignee: APPLIED MATERIALS, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A plasma reactor comprising:
a workpiece processing chamber including a workpiece support to hold a workpiece in a first plane;
a cylindrical microwave cavity that overlies the workpiece processing chamber, the cylindrical microwave cavity including a floor that is parallel to the first plane and separates the cylindrical microwave cavity from the workpiece processing chamber and includes a plurality of apertures for microwave energy to pass into the workpiece processing chamber, a ceiling, a cylindrical sidewall, and exactly two microwave input ports in the cylindrical sidewall of said cylindrical microwave cavity, the two microwave input ports including a first input port and a second input port spaced apart by an oblique azimuthal angle;
a microwave source having a microwave frequency and having a pair of microwave source outputs; and
a pair of respective waveguides, each of the respective waveguides including
a microwave input end coupled to a respective one of the microwave source outputs,
a microwave output end coupled to a respective one of the first and second input ports,
a coupling aperture plate at the output end, the coupling aperture plate having a rectangular coupling aperture therethrough, and
an iris plate between the coupling aperture plate and the microwave input end, the iris plate having a rectangular iris opening therethrough.