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RFID DETECTION SYSTEM

  • US 20130335199A1
  • Filed: 03/14/2013
  • Published: 12/19/2013
  • Est. Priority Date: 06/18/2012
  • Status: Active Grant
First Claim
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1. An RFID detection system, comprising:

  • a detection circuit configured to detect the presence of one or more RFID devices near the RFID detection system, the one or more RFID devices having a resonant frequency, wherein the detection circuit is configured to;

    sweep an operating frequency of the detection circuit across a range of frequencies, the range of frequencies including the resonant frequency of the one or more RFID devices, wherein the sweeping is performed at a sweep frequency;

    monitor a voltage signal in the detection circuit to determine whether the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency; and

    when it is determined that the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency, switch the RFID detection system from a low power mode into an active communication mode.

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