Low side lobe gregorian antenna

Details Low side lobe gregorian antenna Low side lobe gregorian antenna

H - Electricity

01

Q

351/28, 351/54

H01Q 19/19 (2006.01) H01Q 17/00 (2006.01) H01Q 19/02 (2006.01)

Patent

CA 1222562

ABSTRACT OF THE DISCLOSURE A microwave antenna comprising the combination of a paraboloidal main reflector; a subreflector located such that the paraboloidal main reflector and the subreflector have a common focal point lying between the main reflector and the subreflector; a feed horn for transmitting microwave radiation (preferably symmetrically) to, and receiving microwave radia- tion from, said subreflector; and a shield connected to the peripheral portion of the subreflector and having an absorbing surface which reduces side lobe levels both by capturing the feed horn spillover energy and by reducing the diffraction of microwave radiation from the edge of the subreflector. The shield is preferably formed as a continuous axial projection extending from the periphery of the subreflector toward the main reflector substantially parallel to the axis of the feed horn. The reflective surface of the subreflector is suitably a section of an approximate ellipse.

461858

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