×

Near field communication device

  • US 10,361,474 B2
  • Filed: 03/17/2017
  • Issued: 07/23/2019
  • Est. Priority Date: 03/17/2017
  • Status: Active Grant
First Claim
Patent Images

1. A device, for contactless communication comprising:

  • an NFC module being adapted to generate an electromagnetic carrier signal and to modulate the carrier signal according to data to be transmitted;

    a differential power combiner circuit coupled to said NFC module via output terminals of said NFC module; and

    an antenna circuit coupled to and driven by said NFC module with the modulated carrier signal;

    said NFC module comprising a power by the field (PBF) circuit adapted to harvest energy from an external field to power said device;

    said power by the field circuit having a first terminal coupled to an output of said differential power combiner circuit via a first impedance block and a second terminal coupled to an input of said antenna circuit via a second impedance block;

    said device being adapted to be able to operate in a power by the field card mode;

    wherein said first impedance block includes a first impedance element internal to the NFC module and a second impedance element external to the NFC module, said first and second impedance elements being arranged in series;

    wherein said second impedance block includes a third impedance element internal to the NFC module and a fourth impedance element external to the NFC module, said third and fourth impedance elements being arranged in series;

    wherein said first impedance element is further coupled to a first switch, said first impedance element and said first switch being arranged in parallel; and

    wherein said third impedance element is further coupled to a second switch, said third impedance element and said second switch being arranged in parallel.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×