×

RFID antenna structure for increased range when coupled with a mobile device

  • US 10,418,711 B2
  • Filed: 05/21/2018
  • Issued: 09/17/2019
  • Est. Priority Date: 07/19/2013
  • Status: Active Grant
First Claim
Patent Images

1. A radio frequency identification (RFID) tag device, comprising:

  • a radio frequency (RF) interface that operates at a first RF frequency;

    a controller coupled to the RF interface; and

    an RFID antenna assembly comprising;

    a first dipole element and a second dipole element on a first side of a circuit board, wherein the first and second dipole elements are shaped as a half rectangle with an additional segment joining the respective element to a tuning element;

    a ferrite dielectric disposed on a second side of the circuit board, opposite the first side, wherein the ferrite dielectric is located in correspondence with one of the dipole elements; and

    the tuning element, which is a loop antenna, wherein the first and second dipole elements are printed on a surface of a printed circuit board,the first and second dipole elements are electrical mirror images of each other from a vertical centerline at a mid-point of the tuning element;

    wherein a structure of the RFID tag device establishes a distance between the RFID antenna assembly and internal components of a mobile device that functions as a ground plane such that, when the RFID tag device is coupled to the mobile device, the mobile device functions as a reflector to increase gain of the RFID antenna assembly, whereby improving transmission range of the RFID tag device relative to a range of the RFID tag device when not coupled to the mobile device, wherein the transmission range of the RFID tag device is improved by the mobile device functioning as the reflector is at least twenty feet.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    Ɨ
    Ɨ