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RF SIM card, card reader, and communication method

  • US 8,630,584 B2
  • Filed: 01/21/2011
  • Issued: 01/14/2014
  • Est. Priority Date: 11/26/2008
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) device comprising:

  • an RF transceiver;

    an RF antenna; and

    a magnetic signal detector;

    wherein the magnetic signal detector is configured to;

    receive a magnetic field signal from an RF reader, the magnetic field signal including identification information of the RF reader, anddetermine, based on the magnetic field signal, whether the RF device and the RF reader are in an effective communication,wherein the RF transceiver is configured to;

    send authentication information to the RF reader, andconduct a transaction with the RF reader through an RF channel, andwherein the magnetic field signal comprises a low-frequency alternating magnetic field that has a frequency selected such that at or below the frequency no calibration is required for different mobile terminals having the RF device installed therein.

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