Method for improving pattern bandwidth of shaped beam reflectarrays
CA 2242482 C · Owner: Chwalek, Thomas J. · Inventors: Ramanujam, Parthasarathy; Cooley, Michael E.; Chwalek, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for shaping reflected radio frequency signals includes geometrically shaping a reflector surface (14) of an antenna (12) to focus the beam, and reflectively shaping the reflector surface with phasing elements (38) that emulate geometric shaping to configure the beam (26) to a predetermined shape. In the preferred embodiment, the antenna (12) comprises a geosynchronous satellite antenna (12) conveying signals from a wave guide horn (73) to or from a predetermined geographic area (28) on earth. The use of parabolic-approaching surface of reflectarray phasing elements for shaping the beam substantially improves the beam pattern bandwidth over the performance of …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed July 8, 1998 and granted June 19, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.