Iq combiner technology in modulated backscatter system
CA 2221905 C · Owner: Shober, R. Anthony · Inventors: Shober, R. Anthony; Wu, You-Sun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accordance with the present invention an RFID system has a, homodyne receiver having two outputs; the in-phase or I output and the quadrature or Q output. The modulated baskscattered signal is composed of an information signal modulated onto a single frequency subcarrier signal generating a modulated, subcarrier signal; this modulated subcarrier signal is then backscatter modulated onto the incoming RF signal. To demodulate this modulated backscattered signal the Iand Q outputs are combined using an IQ combiner. This IQ combiner introduces a 90° phase shift, with respect to the frequency of the subcarrier signal onto one of the, demodulator outputs and then combines the outputs 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 November 24, 1997 and granted June 5, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 2019.
- 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.