Patents by Inventor Andries Petrus Cronje Fourie

Andries Petrus Cronje Fourie has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Broad bandwidth, high impedance transponder for electronic identification system
    Patent number: 6891466
    Abstract: A transponder 14.1 for an electronic radio frequency identification system comprises an antenna 18 having an antenna impedance at a feedpoint thereof. The transponder further comprises an electronic circuit 19 having an input connected to the antenna. The antenna impedance having impedance characteristics for developing first and second voltage maxima (36, 38) across the input at first and second frequencies (fL and fH) respectively, thereby to provide a continuous operative frequency band for the transponder including the first and second frequencies.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: May 10, 2005
    Inventors: Christopher Gordon Gervase Turner, David Edwin Proctor, Andries Petrus Cronje Fourie
  • Hybrid antenna arrangement for use with electronic identification systems
    Patent number: 6346922
    Abstract: A dipole antenna 34 comprises a loop 36 as a first pole and an appendage 42 comprising a strip 44 terminating in a pad 46 as a second pole. The circumference of the loop is in the order of one half-wavelength of an operating frequency and an effective length of the appendage is at least 0.15 times the wavelength. The dipole antenna 34 is shorter than conventional half-wavelength dipole antennas, has a better frequency response and the antenna impedance ZA is dependent on the position of a feedpoint 38 in the loop 36. The antenna may be used with transponders for electronic radio frequency identification systems.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: February 12, 2002
    Assignee: Supersensor (Proprietary) Limited
    Inventors: David Edwin Proctor, Christopher Gordon Gervase Turner, Andries Petrus Cronje Fourie
  • Broad bandwidth, high impedance transponder for electronic identification system
    Publication number: 20020014993
    Abstract: A transponder 14.1 for an electronic radio frequency identification system comprises an antenna 18 having an antenna impedance at a feedpoint thereof. The transponder further comprises an electronic circuit 19 having an input connected to the antenna. The antenna impedance having impedance characteristics for developing first and second voltage maxima (36, 38) across the input at first and second frequencies (fL and fH) respectively, thereby to provide a continuous operative frequency band for the transponder including the first and second frequencies.
    Type: Application
    Filed: June 18, 2001
    Publication date: February 7, 2002
    Inventors: Christopher Gordon Gervase Turner, David Edwin Proctor, Andries Petrus Cronje Fourie