Antenna apparatus, method of manufacturing same and method of designing same
CA 2184972 C · Owner: Konishi, Yoshihiko · Inventors: Ohtsuka, Masataka; Isota, Yoji; Matsunaga, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An antenna apparatus, a method of manufacturing the same and a method of designing the same, are provided. A first dielectric layer, first dielectric film second dielectric layer, and second dielectric film are laminated on a flat metal plate in the mentioned order. A radiation element fed through a feeding line is arranged below another radiation element that is not fed through the feeding line. The feeding line forms along, its overall length, a microstrip line having the dielectric layer sandwiched by the feeding line and the flat conductive plate resulting in no model change from the microstrip line to a triplate line or vice versa, with reduced feeding loss. The thickness of the …
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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 September 6, 1996 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 6, 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
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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.