Parabolic reflector with rim of absorbing material to attenuate side lobes

Claim 1

FOR USE WITH AN AIRCRAFT RADAR SET HAVING A SCOPE, AN ANTENNA COMPRISING A SUBSTANTIALLY ROUND PARABOLIC CONCAVE REFLECTOR HAVING A FORWARDLY EXTENDING CENTRAL AXIS AND A PERIPHERAL EDGE, A RADIATOR ELEMENT, MEANS SECURING SAID RADIATOR ELEMENT TO SAID REFLECTOR AND FORWARDLY OF SAID PERIPHERAL EDGE OF SAID REFLECTOR ON SAID AXIS, SAID RADIATOR IN COMBINATION WITH SAID REFLECTOR BEING CAPABLE OF PRODUCING A FORWARD ENERGY LOBE ORIENTATED ON THE AXIS OF SAID REFLECTOR AND SIDE LOBE ENERGY ORIENTATED ADJACENT TO THE PERIPHERAL EDGE OF SAID REFLECTOR AND EXTENDING GENERALLY RADIALLY OF SAID AXIS, AN ELONGATED ARCUATE STRIP OF RADIATION ABSORBING MATERIAL CURVED SUBSTANTIALLY THE SAME DEGREE AS SAID PERIPHERAL EDGE, SAID STRIP HAVING AN AXIALLY INNER EDGE PORTION TELESCOPICALLY RECEIVED WITHIN THE PERIPHERAL EDGE OF SAID REFLECTOR, MEANS FIXEDLY SECURING SAID EDGE PORTION OF SAID STRIP TO THE PERIPHERAL EDGE OF SAID REFLECTOR, SAID STRIP BEING FLARED IN RELATION TO SAID AXIS SO THAT SAID EDGE PORTION FITS FLUSH AGAINST AND PARALLEL TO THE PERIPHERAL EDGE OF SAID REFLECTOR, THE REMAINDER OF SAID STRIP FLARING RADIALLY OUTWARDLY AND