Transponder with selective antenna beam using shared antenna feed elements
CA 2012850 C · Owner: Hughes Aircraft Company · Inventors: Hahn, Carl J. Iii; Berman, Arnold L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transponder (10) that selectively provides both global and spot beam antenna coverage. The transponder (10) comprises a channel amplifier (12) and an antennafeed network (18) that includes coupler means (20) for coupling energy into a plurality of power distribution networks (21, 22) that feed a plurality of antenna radiating elements that form a beam that illumates the desired coverage area. A variable power divider (13) is coupled to the amplifier (12) that variably couples power along two channel output paths. Each output path includes a matched bandpass filter (14 16) and the second output path includes a phase delay circuit (15). Selective control of the ratio of the power coupled to …
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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 March 22, 1990 and granted October 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2012.
- 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
Timeline From CIPO dates
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.