Antenna system wherein beamwidth variation is achieved by changing aperture area of primary antenna

Claim 1

AN ANTENNA SYSTEM WITH MEANS FOR CHANGING THE BEAMWIDTH OF THE RADIATION PATTERN OF ELECTROMAGNETIC WAVES RADIATING FROM SAID ANTENNA SYSTEM WHICH COMPRISES A CONCAVE REFLECTOR HAVING A FOCUS AND A VERTEX, SAID ELECTROMAGNETIC WAVES EMANATING FROM SAID CONCAVE REFLECTOR AND HAVING A PLANE WAVEFRONT, A SINGLE RADIATING PRIMARY ANTENNA LOCATED NEAR SAID VERTEX, SAID RADIATING PRIMARY ANTENNA HAVING ITS AXIS COINCIDENT WITH AND ITS RADIATION PATTERN DIRECTED ALONG THE AXIS OF SAID CONCAVE REFLECTOR TOWARD SAID FOCUS, AN INTERMEDIATE REFLECTOR HAVING ITS AXIS COINCIDENT WITH THE AXIS OF SAID CONCAVE RELECTOR, SAID INTERMEDIATE REFLECTOR BEING SITUATED TO INTERCEPT THE RADIATION PATTERN OF SAID RADIATING PRIMARY ANTENNA, THEREBY COUPLING WAVES BETWEEN SAID RADIATING PRIMARY ANTENNA AND SAID CONCAVE REFLECTOR, AND MEANS FOR CHANGING THE APERTURE AREA OF SAID REDIATING PRIMARY ANTANNA, THEREBY CONTROLLING THE EXTENT OF COUPLING BETWEEN SAID RADIATING PRIMARY ANTENNA AND SAID CONCAVE REFLECTOR TO CHANGE THE BEAMWIDTH OF THE RADIATION PATTERN OF SAID ANTENNA SYSTEM WITHOUT CHANGING THE PLANE WAVEFRONT CHARACTERISTICS AND THE DIRECTION OF RADIATION OF THE ELECTROMAGNET WAVES EMANATING FROM SAID CONCAVE REFLECTOR.