Importance

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Abstract

An antenna, particularly adapted to produce a scanning beam usable for radar and communication applications, includes a frame. Attached to the frame is a reciprocating device that is operatively connected to a reflecting conductor. Spaced by a uniform gap from the conductor is an elongated dielectric waveguide carried on a conductive layer of a laminate supported by the frame on an input side of the antenna. The waveguide covers a set of spaced apart apertures in the laminate conductive layer. Joined to the laminate conductive layer on an opposite output side of the antenna is a dielectric layer. On an outer surface of the laminate dielectric layer is a set of spaced apart conductive patches that align with the laminate conductive layer apertures. During operation of the antennas an electromagnetic wave is transmitted through the waveguide to pass through the laminate apertures and energizes the patches. At the same time, the reflecting conductor moves back and forth toward the waveguide to vary the uniform gap to induce a phase shift in the electromagnetic wave passing therethrough. Electromagnetic energy from the energized patches combines in phase to form an outward projecting beam of radiated energy that scans from side-to-side.

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First Claim