Microstripline interdigital planar filter
CA 1264073 C · Owner: Com Dev Limited · Inventors: Pramanick, Protap
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microstripline interdigital planar filter has a number of microstripline coupled resonators in an inhomogeneous medium consisting a soft dielectric substrate, and a high dielectric constant high Q, ceramic superstrate. The resonators are printed on the soft substrate as thick copper strips. The rectangular shaped, silver-coated aluminum housing dimensions are chosen so as to give the highest available unloaded Q factor of the resonators. The high dielectric constant of the superstrate is chosen so as to give a very small resonator length resulting in a very small filter size. The input and the output ports are located at right tapping points on the two outermost resonators. The tapping …
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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
- Granted December 27, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 27, 2006.
- 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.