Phased-array antenna apparatus
CA 2241375 C · Owner: Nec Corporation · Inventors: Marumoto, Tsunehisa; Suzuki, Kenichiro; Saryo, Tomoaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A phased-array antenna apparatus used in a microwave or milliwave band and having a high gain includes a multilayer structure. The multilayer structure is constituted by M radiating elements M, phase shifters, phase shifting control circuits and a, feeding unit. The phase shifters are respectively coupled to the radiating elements to shift the phase of a feeding signal supplied to each of the radiating elements in units of N (M and N are integers equal to or larger than two) bits. The phase shifting control circuits control phase shifting of the phase shifters. The feeding unit is arranged to be coupled to each of the radiating elements.
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 June 22, 1998 and granted December 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 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
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.