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Near field RFID probe with tunning

  • US 10,637,444 B1
  • Filed: 12/21/2018
  • Issued: 04/28/2020
  • Est. Priority Date: 12/21/2018
  • Status: Active Grant
First Claim
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1. A radio-frequency identification (“

  • RFID”

    ) probe comprising;

    a probe tip comprising a resonant coil configured to communicate with an RFID compatible device at a predetermined resonant frequency, the resonant coil including a plurality of strands in a crisscross spiral form that are connected in parallel;

    a plurality of switch capacitor networks each comprising a capacitor and an RF switch, wherein switching the RF switch on and off in the plurality of switch capacitor networks charges or does not charge the capacitor in the plurality of switch capacitor networks thereby switching one or more of the associated of the plurality of switch capacitor networks on and off, which changes the capacitance of the resonant coil, thereby changing a resonant frequency of the resonant coil; and

    a probe control module configured to adjust the resonant frequency of the resonant coil to maintain the predetermined resonant frequency by switching the switch capacitor networks responsive to detecting that the resonant frequency of the resonant coil has deviated from the predetermined resonant frequency.

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