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Radiofrequency based sensor arrangement and a method

  • US 7,714,593 B2
  • Filed: 12/16/2004
  • Issued: 05/11/2010
  • Est. Priority Date: 12/18/2003
  • Status: Active Grant
First Claim
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1. A sensor arrangement remotely readable by a separate reader utilizing radio frequencies for determining desired quantities from sources, the arrangement comprising:

  • an LC resonator comprising a capacitor and a coil,an electrically conductive ring,a sensor element coupled to the LC resonator, whose properties change as a function of a measurable quantity, the sensor element being coupled inductively with the LC resonator without forming a direct galvanic contact, wherein the sensor element is arranged inside the electrically conductive ring and is thinner than the electrically conductive ring, anda package containing foodstuffs or medicinal substances, wherein the sensor element is arranged inside the package and the coil is arranged outside the package,wherein the coil is configured to generate a magnetic field on a location of the sensor element, and wherein the sensor element directly affects the magnetic field generated by the coil.

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