Antenna apparatus including frequency separator having wide band transmission or reflection characteristics
CA 1198811 A · Owner: Nippon Electric Co. Ltd. · Inventors: Iwata, Ryuichi; Sato, Ikuro; Tamagawa, Susumu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An antenna apparatus of the type comprising a frequency separator having a plurality of frequency-selective reflecting surface members for separating electromagnetic waves and two electromagnetic horns for the feeding of said electromagnetic waves is described. Each of the surface members has a lattice in turn having a periodic pattern of conductive material and inherent resonance frequency; the inherent resonance frequencies of the various surface members are substantially equal to each other. The lattice is capable of serving as an inductive-capacitive circuit element at a specific frequency region lower than the inherent resonance frequency and exhibiting substantially equal inductance …
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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 31, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 31, 2002.
- 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.