Reduced-height waveguide-to-microstrip transition
CA 2010479 C · Owner: Lenzing, Harry F. · Inventors: Lenzing, Harry F.; Wu, You-Sun; Ahlborn, William G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The present invention relates to a transition wherein a microstrip line (10), formed on one major surface of a substrate (11) is, capacitively coupled to a reduced-height waveguide (15) comprising a, predetermined width-to-height ratio by means of a T-bar conductive, pattern (12) formed on a substrate at the end of the microstrip line. Such T-bar transitions can also be connected on opposite ends of the microstrip line to provide connections between two waveguide sections. (FIG. 1)
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 February 20, 1990 and granted December 14, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 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.