Importance

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Abstract

A flat plate array is provided which permits generation of two independent beams from a single slotted waveguide antenna. The two beams are coincident in space, but are of two different linear polarizations, those polarizations being orthogonal, i.e., at right angles to each other. In the preferred embodiment, a plurality of slots are provided in a flat top plate of a waveguide cavity. The slots are located in rows and columns with a predetermined spacing between pairs of slots positioned in the respective rows and columns. Each beam is associated with its own input/output port and either the rows or columns of slots of the array. Coupling the two ports with a suitable power splitter and phase shifter permits the antenna to produce a single beam with any elliptical polarization, any linear polarization, right circular polarization, or left circular polarization, plus a second coincident beam with polarization characteristics 'orthogonal' to the first, for example, right circular polarization and left circular polarization.

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First Claim