Multibeam antenna

Claim 1

A multibeam antenna comprising: a main reflector constituted by at least a first and a second partial reflector, each having a uniform paraboloid surface, said first partial reflector being defined by a part of a first paraboloid which has a first focus and a first axis of rotation, said second partial reflector being defined by a part of a second paraboloid which has a second focus and a second axis of rotation, said first and second partial reflectors being positioned such that they form a single curved surface with said first and second axis oriented in different directions relative to each other, said first and second said paraboloids being interconnected by a connecting portion having the shape of an unclosed curve within the main reflector; a subreflector located between said main reflector and said first and second focuses comprising: a first curved portion located on the same side as said first partial reflector which is located on one side with respect to a center axis of said antenna, a second curved portion located on the same side as said second partial reflector which is located on the other side with respect to said center axis, and an intermediate portion interconnecting said first and second curved portions; a first primary radiator radiating an electromagnetic wave toward said main reflector to irradiate said first partial reflector and a part of said second reflector; and a second primary radiator for radiating an electromagnetic wave toward said main reflector to illuminate said second partial reflector and a part of said first partial reflector, wherein said first and second primary radiators are located at, respectively, a first and a second inverted image point which are symmetrical to, respectively, said first and second focuses with respect to said subreflector, said first and second primary radiator each radiating an electromagnetic wave indirectly toward said main reflector through said subreflector.