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PROTECTION OF AN NFC OR RFID RADIO IN THE PRESENCE OF STRONG ELECTROMAGNETIC FIELDS

  • US 20150154486A1
  • Filed: 12/02/2013
  • Published: 06/04/2015
  • Est. Priority Date: 12/02/2013
  • Status: Active Grant
First Claim
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1. A near-field communication (NFC) or radio frequency identification (RFID) device comprising:

  • an NFC or RFID circuit;

    an antenna having at least a first terminal;

    a first rectifier connected to the first terminal of the antenna;

    a switch between the first rectifier and the NFC or RFID circuit;

    a voltage detector for detecting a voltage in the device caused by a signal received at the antenna; and

    a control module for controlling the switch, wherein when the voltage exceeds a threshold magnitude, the control module controls the switch to be in an open state and, after a predetermined time period, determines whether the voltage still exceeds the threshold magnitude and, if the voltage still exceeds the predetermined magnitude, controls the switch to be in the open state.

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