Inventors:
John A. Lantagne - Salem NH
Edwin C. Powers - Groveland MA
Assignee:
Raytheon Company - Lexington MA
International Classification:
G01S 703
Abstract:
A radio frequency energy radar system having a transmitting antenna system for transmitting and directing CW radio frequency energy toward a target. A receiving antenna system, adjacent to the transmitting antenna system, receives portions of the transmitted CW radio frequency energy reflected by the target. The receiving antenna system including a plurality of antenna elements disposed along a path and arranged to provide an antenna pattern having a main lobe antenna pattern directed toward the target and adjacent side lobe antenna pattern. A septum is positioned between the transmitting antenna and the receiving antenna, for shielding unwanted portions of the transmitted CW radio frequency energy from passing directly from the transmitting antenna to the antenna elements of the receiving antenna The shielding means terminates along an edge positioned in a region forward of the antenna elements. The distances between the antenna elements and points along the edge are selected to produce a non-uniform phase distribution of unwanted CW energy scattered by the edge and received by the antenna elements, such phase distribution being selected to enable the receiving antenna system to focus such unwanted scattered energy into the side lobe antenna pattern, thereby decreasing the amount of coupled energy from the transmit array to the receive array.