Flat plate antenna
CA 2080244 A1 · Owner: Poulton, Geoffrey T. · Inventors: Poulton, Geoffrey T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flat plate transmit/receive antenna (1) is disclosed having first and second parallel plate waveguides (2 3). A waveguide bend , (4) communicates energy between the waveguides (2 3) to enable, transmission and reception from an exposed plate (5) of the second waveguide (3) within which an array of apertures (6) is formed. A coupler or probe (8) is provided at a focus of the first waveguide (2) to cause, on transmission a cylindrical phase front to, propagate along the first waveguide (2) which is converted by the waveguide bend (4) to a planar phase front in the second waveguide (3). Scanning and dual polarisation embodiments are also disclosed.
Read the whole patent
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 April 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2013.
- 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.