The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1999
Filed:
Aug. 08, 1996
John R Sanford, Palo Alto, CA (US);
Raymond R Blasing, Los Altos, CA (US);
Ahmed A Kishk, Oxford, MS (US);
Endgate Corporation, Sunnyvale, CA (US);
Abstract
An improved subreflector antenna with lower sidelobes than prior art subreflector antennas is disclosed herein. A tapered, anisotropic, corrugated subreflector is attached to a waveguide and located at the focus of a near-parabolic deep dish main reflector. The subreflector has corrugations of varying depth. The varying depths of the corrugations result in varying reactance, or reactance taper, of the subreflector. This taper is designed in such a manner to guide or steer the energy from the antenna feed to the main reflector in such a manner as to help assure sharply reduced sidelobes. Further, the subreflector is physically shaped so as to further steer or guide the energy in the desired direction. The deep geometry of the main reflector allows the reduced sized subreflector to be positioned within the rim of the main reflector such that the combination can be covered by a flat radome.