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An antenna that includes a housing having a plurality of walls forming an enclosure, a slot formed in a first wall of the housing, and, a folded cavity formed in a second wall of the housing opposite the first wall. The folded cavity is preferably a compound cavity that includes a first cavity porti

An antenna that includes a housing having a plurality of walls forming an enclosure, a slot formed in a first wall of the housing, and, a folded cavity formed in a second wall of the housing opposite the first wall. The folded cavity is preferably a compound cavity that includes a first cavity portion and a second cavity portion joined around their entire respective peripheries by a fold or shelf. Any convenient RF transmission line, e.g., a waveguide or coaxial cables, can be used to inject RF energy into the folded cavity. In certain embodiments, both the width and length of the housing are each less than 1/2 of a free-space wavelength, and the antenna is capable of producing very accurate circular polarization and is capable of handling very high power levels, e.g., 10 kW, thereby making it suitable for high power applications which require extremely compact antenna elements, e.g., wide-scan phased array antennas.

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[ What is claimed is:] [19.]19. An compact, folded cavity-backed slot antenna comprising:a housing having a plurality of walls forming an enclosure, wherein at least one of the length and width dimensions of the housing is no greater than 1/2 of a free-space wavelength;a cross-shaped slot formed in

[ What is claimed is:] [19.]19. An compact, folded cavity-backed slot antenna comprising:a housing having a plurality of walls forming an enclosure, wherein at least one of the length and width dimensions of the housing is no greater than 1/2 of a free-space wavelength;a cross-shaped slot formed in a first wall of the housing;a folded cavity formed in a second wall of the housing opposite the first wall, wherein the folded cavity comprises a compound cavity comprised of a first cavity portion and a second cavity portion joined around their entire respective peripheries by a shelf;means for injecting RF energy into the folded cavity; andwherein the cross-shaped slot produces circularly polarized radiation.