Raytheon Company

Edward A Geyh

Jack J Schuss

Kaichiang Chang

Fernando Beltran

Jeffrey C Upton

Joseph A Preiss

Robert P Zagrodnick

James E Rhein

A phased array antenna having an array of antenna elements, an array of phase shifter sections, each one thereof being associated with a corresponding one of the antenna elements, and a cold-plate having a pair of surfaces, one of the surfaces having the array of phase shifter sections mounted, and thermally coupled, thereto and an opposite one of the pair of surfaces having thermally conductive posts projecting outwardly therefrom, each one of the posts being disposed behind a corresponding one of the plurality of mounted phase shifter sections. A heat sink plate is thermally coupled to distal ends of the posts. The cold-plate has a plurality of feeds passing therethrough. The phased array antenna includes a power/radio frequency energy distribution section mounted to said opposite one of the pair of cold plate surfaces for distributing power and radio frequency energy among the phase shifter sections mounted to the cold plate. The radio frequency energy distribution section comprises a plurality of stacked printed circuit boards and the posts pass through the stacked printed circuit boards to the heat sink plate and radio frequency energy is coupled to the phase shifter section though coupling power dividers and slots provided in the stacked, power/radio frequency energy distribution section printed circuit boards. An array of antenna elements is provided having an array of patch radiators. A conductive layer is provided having an array of cavities disposed therein, each one of the patch radiators being disposed over an associated one of the cavities.

Phased array antenna

A single radiating structure with an integrated mode transducer that produces near-ideal radiation characteristics at two frequency bands. The dual band feed consists of three main sections: feed waveguide, mode transducer and corrugated horn. The feed waveguide consists of two concentric, circular waveguides that are excited in the TE.sub.11 coaxial and circular waveguide modes for the low and high bands, respectively. The mode transducer, which is critical to the performance of the feed, provides a single mode, low return loss transition, for both bands, between the feed waveguide and the corrugated horn. This is achieved by converting the TE.sub.11 circular waveguide modes into the fundamental hybrid, HE.sub.11, mode of the corrugated horn. The corrugated horn, which is a stepped-slot configuration, is designed to achieve a smooth transition from the mode transducer and to produce the desired radiation characteristics at both frequency bands.

Dual band feed with integrated mode transducer

A radar type center fed antenna comprising a small radiating horn supported at the focal point of a parabolic reflector by three struts which are oriented to minimize the parallel polarization scattering and which have a low scattering ogive cross-section. The horn is mounted at the vertex of the parabolic surface and the intersection of the three struts using a bracket that provides minimal blockage. The struts are attached to the perimeter of the reflector. One strut having a feed waveguide is attached to the top-center of the reflector and the other two are attached at points on either side of the bottom-center at thirty degree angles to the vertical plane. The strut shape and feed-horn supporting and attaching arrangement and the integration of the feed waveguide into one of the struts results in a very low sidelobe antenna that produces a far-field pattern that has very low forward scattering due to feed and strut blockage.

Low sidelobes antenna

Growing community of inventors

Groton, MA, United States of America

Edward A Geyh