Patents by Inventor Cornelis Frederick du Toit

Cornelis Frederick du Toit 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).

  • Phase shifters having a tunable dielectric layer and a resistive ink layer and method of manufacture therefore
    Patent number: 7477116
    Abstract: An embodiment of the present invention provides a phase shifter, comprising a substrate, resistive ink adjacent one surface of said substrate and separating a voltage tunable dielectric material from said surface of said substrate and a plurality of conductors adjacent said voltage tunable dielectric material separated so as to form a gap filled with resistive ink in said gap.
    Type: Grant
    Filed: January 27, 2007
    Date of Patent: January 13, 2009
    Assignee: Paratek Microwave, Inc.
    Inventors: Cornelis Frederick du Toit, Louise C. Sengupta
  • High gain, steerable multiple beam antenna system
    Patent number: 6992638
    Abstract: A multi-beam antenna system is described herein that can be used in microwave frequency applications between 1 GHz and 100 GHz. The multi-beam antenna system covers four 90° sectors for full 360° coverage. Each 90° sector is covered with at least 1 narrow steerable transmit (TX) and 1 narrow steerable receive (RX) beam. The beams are steered in the azimuth dimension.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: January 31, 2006
    Assignee: Paratek Microwave, Inc.
    Inventors: Cornelis Frederick du Toit, Shuguang Chen, Ernest P. Ekleman
  • High gain, steerable multiple beam antenna system
    Publication number: 20050068249
    Abstract: A multi-beam antenna system is described herein that can be used in microwave frequency applications between 1 GHz and 100 GHz. The multi-beam antenna system covers four 90° sectors for full 360° coverage. Each 90° sector is covered with at least 1 narrow steerable transmit (TX) and 1 narrow steerable receive (RX) beam. The beams are steered in the azimuth dimension.
    Type: Application
    Filed: March 29, 2004
    Publication date: March 31, 2005
    Inventors: Cornelis Frederick du Toit, Shuguang Chen, Ernest Ekelman
  • Farfield calibration method used for phased array antennas containing tunable phase shifters
    Patent number: 6686873
    Abstract: A method for calibrating a phased array antenna and the calibrated phased array antenna are described herein. In the preferred embodiment of the present invention, the method for calibrating a phased array antenna containing a plurality of electronically tunable phase shifters each of which is coupled to a column of radiating elements includes the steps of: (a) characterizing, without having any prior phase shift versus tuning voltage data, each of the electronically tunable phase shifters; (b) calculating phase offsets for each column of radiating elements using a farfield antenna range and the characterized data for each of the electronically tunable phase shifters; and (c) using the calculated phase offsets in a calibration table to adjust the tuning voltage of each of the electronically tunable phase shifters to cause the columns of radiating elements to yield a uniform beam.
    Type: Grant
    Filed: August 19, 2002
    Date of Patent: February 3, 2004
    Assignee: Paratek Microwave, Inc.
    Inventors: Jaynesh Patel, Cornelis Frederick du Toit, Vincent G. Karasack