WALL CONFIGURATIONS FOR GENERATING UNIFORM FIELD REFLECTION

A method of generating an RF field reflection, including positioning a grid wall in front of a conductive wall, launching RF energy at the grid wall and said conductive wall, including first and second linearly polarized orthogonal components, and highly reflecting one component from the grid wall set and allowing the other component to pass through the grid wall set with little reflection to reflect from the conductive wall. A microwave oven includes an oven cavity, defined by flat, electrically conductive oven walls. A microwave source generates microwave energy including orthogonal linearly polarized components into the oven cavity from a port formed in a first one of the oven walls. A grid wall of conductive lines parallel to a polarization direction is spaced from a second oven wall by a distance nominally equivalent to a quarter wavelength of the microwave energy.