Spiral antenna with spiral reflecting cavity

Claim 1

A UNIDIRECTIONAL ANTENNA SYSTEM COMPRISING: AN ACTIVE ANTENNA ELEMENT IN THE FORM OF TWO ELECTRICALLYINTERCONNECTED ARMS DISPOSED IN COPLANAR RELATIONSHIP, EACH OF SAID ARMS HAVING THE CONFIGURATION OF A SPIRAL THE RADIUS OF WHICH PROGRESSIVELY INCREASES OUTWARDLY FROM A CENTRAL POINT, THE SAID TWO ARMS BEING ELECTRICALLY INTERCONNECTED AT SUCH CENTRAL POINT; MEANS FOR ENERGIZING SAID ANTENNA ELEMENT; A CONICAL REFLECTOR, SAID ACTIVE ELEMENT BEING MOUNTED ADJACENT SAID REFLECTOR SO THAT SAID ELEMENT IS IN FRONT OF, AND SYMMETRICALLY DISPOSED WITH RESPECT TO, THE APEX OF THE CONVEX SIDE OF SAID REFLECTOR, AND IN A PLANE NORMAL TO THE AXIS OF REVOLUTION OF THE LATTER; A PAIR OF BAFFLE STRIPS RESPECTIVELY AND EQUIDISTANTLY DISPOSED IN ALTERNATING FASHION BETWEEN THE ARMS OF SAID ELEMENT, EACH BAFFLE STRIP HAVING A SPIRAL FORM SIMILAR TO THAT OF THE ANTENNA ARMS, EACH OF SAID BAFFLE STRIPS BEING COMPOSED OF MATERIAL CAPABLE OF REFLECTING AT LEAST A PORTION OF THE ENERGY RADIATED FROM SAID ANTENNA ARMS WHEN SAID SYSTEM IS IN OPERATION; AND MEANS FOR MOUNTING SAID BAFFLES UPON SAID REFLECTOR WHEREBY THE BAFFLES EXTEND IN A DIRECTION NORMAL TO THE PLANE DEFINED BY THE ANTENNA ARMS, WITH CORRESPONDING EDGES OF THE BAFFLES IN SUBSTANTIALLY CONTINUOUS CONTACT WITH THE SURFACE OF THE REFLECTOR, AND THE OPPOSITE CORRESPONDING EDGES OF THE BAFFLES IN THE PLANE OF, BUT SPACED FROM, THE ARMS OF SAID ANTENNA.