Patent ID: 9018571
Filing Date: 2015-04-28
Classification: H05B

Abstract:
1. A microwave oven, comprising: an oven cavity, defined by oven walls, said oven walls highly reflective to incident electromagnetic energy; a microwave source for generating microwave energy and launching the microwave energy into the oven cavity from a port formed in a first one of the oven walls, wherein the launched microwave energy includes first and second energy components, said first and second energy components being linearly polarized components which are orthogonal to each other; a planar grid comprising a set of linear spaced, parallel, electrically conductive lines, said set parallel to a polarization direction of a first one of said first and second linearly polarized components, said grid configured to reflect incident microwave energy of said first one of said linearly polarized components and to allow incident energy of said second linearly polarized component to pass through the grid; said grid positioned inside said cavity and spaced from a second one of said oven walls, said second one of said oven walls being opposite said first one of said oven walls; wherein the oven is configured such that the second linearly polarized component of the incident energy is reflected by the second oven wall, and wherein the first and second linearly polarized components reflected respectively by the grid and the second oven wall combine to form a standing wave pattern in the oven cavity having a more uniform electric field than what would result without the grid.