Antenna system wherein beamwidth variation is achieved by changing shape of intermediate reflector

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 PRIMARY ANTENNA LOCATED NEAR SAID VERTEX, SAID PRIMARY ANTENNA BEING SYMMETRICALLY ORIENTED ON AND DIRECTED ALONG THE AXIS OF SAID CONCAVE REFLECTOR TOWARD SAID FOCUS, AN INTERMEDIATE REFLECTOR HAVING ITS AXIS COINCIDENT WITH THE AXIS OF THE CONCAVE REFLECTOR, SAID INTERMEDIATE REFLECTOR BEING SITUATED TO INTERCEPT THE RADIATION PATTERN OF SAID PRIMARY ANTENNA, THEREBY COUPLING WAVES BETWEEN SAID CONCAVE REFLECTOR AND SAID PRIMARY ANTENNA, AND MEANS FOR CHANGING THE SHAPE OF SAID INTERMEDIATE REFLECTOR, THEREBY CONTROLLING THE EXTENT OF COUPLING BETWEEN SAID PRIMARY ANTENNA AND SAID CONCAVE RELECTOR TO INTRODUCE VARIATION IN THE BEAMWIDTH OF THE RADIATION PATTERN OF SAID ANTENNA SYSTEM WITHOUT CHANGING THE PLANE WAVEFRONT CHARACTERISTICS OF THE ELECTROMAGNETIC WAVES EMANATING FROM SAID CONCAVE REFLECTOR.