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An abuse-tolerant microwave food packaging material includes repeated sets of metallic foil or high optical density evaporated material segments disposed on a substrate. Each set of metallic segments is arranged to define a perimeter having a length equal to a predetermined ratio of the operating, o

An abuse-tolerant microwave food packaging material includes repeated sets of metallic foil or high optical density evaporated material segments disposed on a substrate. Each set of metallic segments is arranged to define a perimeter having a length equal to a predetermined ratio of the operating, or effective wavelength of a microwave oven. The repeated sets of segments act both as a shield to microwave energy and as focusing elements for microwave energy when used in conjunction with food products yet remaining electrically safe in the absence of the food products.

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[What is claimed is:] [1.]a continuously repeated first set of metallic foil segments on a substrate, wherein each first set of metallic segments defines a first perimeter having a length approximately equal to a predetermined ratio of an operating wavelength of a microwave oven, and wherein each se

[What is claimed is:] [1.]a continuously repeated first set of metallic foil segments on a substrate, wherein each first set of metallic segments defines a first perimeter having a length approximately equal to a predetermined ratio of an operating wavelength of a microwave oven, and wherein each segment in each first set is spaced apart from adjacent segments.