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Radio frequency data carrier and system for reading data stored therein

  • US 6,922,146 B2
  • Filed: 04/24/2003
  • Issued: 07/26/2005
  • Est. Priority Date: 04/24/2003
  • Status: Expired due to Fees
First Claim
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1. A radio frequency (RF) data carrier comprising:

  • (a) a collection of circuitries defining together a predetermined information code, each circuitry including;

    (a) a code circuit configured to have a certain RF frequency response to a powering signal and thus defining a certain symbol of the predetermined information code, and (b) a delay circuit configured to provide a phase delay of a predetermined value to said powering signal associated with the respective code circuit to thereby define a location of this symbol in the information code; and

    (b) a power unit operable to produce said powering signal to actuate the delay circuit, said power unit comprising at least one inductance coil responsive to alternation of an external magnetic field for generating said powering signal as an electromotive force voltage as a result of intersecting windings of the coil with magnetic flux lines of the external magnetic field.

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