1. A conductive plate configured to be used in a lid assembly of a microwave source, comprising: a electrically conductive body having a plurality of openings there through, each opening configured to receive a dielectric resonator; wherein the electrically conductive body comprises a first surface mateable with a lid plate and a second surface mateable with a showerhead to form the lid assembly; a plurality of gas distribution channels disposed into the second surface of the electrically conductive body; wherein each of the plurality of gas distribution channels extends from proximate an outer edge of the electrically conductive body toward an axial center of the electrically conductive body along straight and curved paths and includes: a cover, at least one first hole extending from a channel to the first surface, and a plurality of second holes extending through the cover.
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