Common aperture isolated dual frequency band antenna
CA 2176877 C · Owner: Raytheon Company · Inventors: Salvail, Gary; Yu, I-Ping
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An antenna comprising a substrate (12) and low band and high band opposite, sense spiral antennas (21 22) formed on the substrate (12) to provide for a common aperture isolated dual frequency band antenna (10). The high band spiral antenna (22) is formed adjacent the center of the substrate (12) while the low band spiral antenna (21) is formed adjacent the periphery of the substrate. The high frequency end of the low band antenna (21) is truncated at the low frequency end of the high band antenna (22), and the low frequency end of the high frequency antenna (22) is truncated at the high frequency end of the low band antenna (21) to provide for mutual isolation between the frequency bands.
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 May 17, 1996 and granted March 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2018.
- 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.