Conical scan radar system and antenna

Claim 1

A CONICAL SCAN DIRECTION FINDING RADAR SYSTEM COMPRISING A TRANSMITTER OF ELECTROMAGNETIC WAVE ENERGY, A RECEIVER OF SUCH TRANSMITTED ELECTROMAGNETIC WAVE ENERGY REFLECTED FROM A REMOTE OBJECT, MEANS OPERATED BY THE RECEIVER IN ACCORDANCE WITH CONICAL SCAN MODULATION CARRIED BY SUCH RECEIVED ELECTROMAGNETIC WAVE ENERGY, REPRESENTING DIRECTIONAL ERROR OF THE CONICAL SCAN AXIS IN RELATION TO THE REFLECTING OBJECT, A WAVE ENERGY REFLECTOR OF GENERALLY PARABOLOIDAL FORM, MEANS CONNECTED TO SAID TRANSMITTER AND INCLUDING A TRANSMITTING ANTENNA RADIATION ELEMENT POSITIONED IN THE VICINITY OF THE FOCAL POINT OF SAID REFLECTOR, ADAPTED FOR DIRECTING TRANSMITTED ELECTROMAGNETIC WAVE ENERGY THEREFROM AGAINST SAID REFLECTOR FROM THE VICINITY OF THE FOCAL POINT OF SAID REFLECTOR AND WITH ONE POLARIZATION, THEREBY TO FORM A TRANSMITTED WAVE ENERGY BEAM DIRECTED ALONG THE AXIS OF SAID PARABOLOIDAL REFLECTOR, MEANS CONNECTED TO SAID RECEIVER AND INCLUDING A RECEIVING ANTENNA RADIATION ELEMENT POSITIONED IN THE VICINITY OF THE FOCAL POINT OF SAID REFLECTOR BUT OFFSET FROM SAID AXIS FOR DIRECTING ELECTROMAGNETIC WAVE ENERGY FROM SAID REFLECTOR TO SAID RECEIVER SELECTIVELY WITH POLARIZATION DIFFERING MATERIALLY FROM THE POLARIZATION OF SAID TRANSMITTED WAVE ENERGY, MEANS TO REVOLVE SAID RECEIVING ANTENNA RADIATION ELEMENT ABOUT SAID AXIS WHILE MAINTAINING CONSTANT POLARIZATION ORIENTATION SELECTIVITY THEREOF, AND MEANS INTERPOSED IN THE PATH OF WAVE ENERGY PROPAGATING FROM SAID TRANSMITTING ANTENNA ELEMENT AND RETURNING TO SAID RECEIVING ANTENNA ELEMENT UPON REFLECTION FROM THE REMOTE OBJECT, SAID MEANS BEING ADAPTED TO CHANGE THE POLARIZATION OF SUCH PROPAGATING ENERGY FROM THE FIRSTMENTIONED POLARIZATION TO THE SECOND.