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Radio frequency transponder system

  • US 9,164,169 B2
  • Filed: 05/19/2011
  • Issued: 10/20/2015
  • Est. Priority Date: 11/20/2008
  • Status: Active Grant
First Claim
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1. A radio frequency transponder, comprising:

  • a substrate; and

    a plurality of planar antennas on the substrate, wherein each antenna has a shape configured to determine a corresponding resonant frequency of the antenna, wherein each of the antennas is configured to determine a phase difference between orthogonal components of a backscattered signal generated in response to excitation of the antenna at the resonant frequency, and wherein the phase difference represents a unique code for the antenna, the unique code being configured to be extracted only from the phase difference between the orthogonal components of the backscattered signal.

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