Parabolic antenna with high speed spinner near focus for scanning

Claim 1

A HIGH SPEED SCANNING BEAM ANTENNA SYSTEM COMPRISING: A PARABOLOIDAL REFLECTOR DISH, A COAXIAL FEED ATTACHED TO SAID DISH, STATIONARY RADIATING ELEMENTS HAVING AXES NORMAL TO THE AXIS OF SAID DISH AND SUPPORTED BY SAID FEED SUBSTANTIALLY AT THE FOCAL POINT OF SAID DISH, A SPINNER ASSEMBLY MOUNTED ON THE FORWARD END OF SAID COAXIAL FEED, SAID SPINNER ASSEMBLY COMPRISING A SPINNER OF DIELECTRIC MATERIAL MOUNTED IN A PLANE PARALLEL TO THE AXES OF SAID RADIATING ELEMENTS AND NORMAL TO THE AXIS OF SAID DISH, AND A FLAT-SIDED ELLIPTICAL REFLECTOR DISC EMBEDDED IN SAID SPINNER AND CANTED AT AN ANGLE TO THE FACES THEREOF, A SHAFT EXTENDING THROUGH SAID COAXIAL FEED ALONG THE AXIS OF SAID DISH, THE FORWARD END OF SAID SHAFT BEING COUPLED TO SAID SPINNER ASSEMBLY, AND ROTATING MEANS COUPLED TO THE AFT END OF SAID SHAFT FOR ROTATING SAID SHAFT TO REVOLVE THE SPINNER TO EFFECT HIGH NUTATION FREQUENCY OF A BEAM OF ELECTROMAGNETIC ENERGY WITH CONSTANT VERTICAL POLARIZATION OF SAID BEAM, WHEREBY THE SHAPE OF THE DISC ESTABLISHES A SYMMETRICAL SCANNING BEAM PATTERN IN BOTH PLANES OF RADIATION.