Patents by Inventor Henk Fischer

Henk Fischer 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).

  • Array of radiating elements
    Patent number: 6115002
    Abstract: The invention comprises an array of radiating elements (1) to be used as a module in a phased-array radar antenna, the radiating elements consisting of waveguides of rectangular section. The radiating elements are disposed on a common surface (2), which causes the common surface to constitute a side wall of each radiating element. The radiating elements preferably consist of channel sections (3). This consequently yields a rigid construction, while the array can be realised in only a limited number of manufacturing operations.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: September 5, 2000
    Assignee: Hollandse Signaalapparaten B.V.
    Inventors: Henk Fischer, Antonius B. M. Klein Breteler
  • Phased array antenna provided with a calibration network
    Patent number: 5977930
    Abstract: A phased array antenna including a number of waveguide radiators in a power supply system. A calibration network provides a test pulse. By directly connecting the calibration network to the waveguide radiators, a more accurate calibration is obtained due to the processing of any phase and amplitude errors arising in the waveguide radiators in a calibration algorithm. The calibration network can be designed as a system of waveguides.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: November 2, 1999
    Assignee: Hollandse Signaalapparaten B.V.
    Inventors: Henk Fischer, Antonius B. M. Klein Breteler
  • Radar apparatus for connecting to a gun
    Patent number: 5574461
    Abstract: A radar apparatus provided with a Cassegrain antenna to be mounted on the barrel of a gun. The Cassegrain antenna is of the polarization twist type with a flat adjustable mirror being used to generate a lead angle. In addition, gun-induced vibrations transmitted to the Cassegrain antenna are compensated by adjusting the flat mirror so that the radar beam generated by the Cassegrain antenna is not susceptible to these vibrations.
    Type: Grant
    Filed: July 17, 1995
    Date of Patent: November 12, 1996
    Assignee: Hollandse Signaalapparaten B.V.
    Inventors: Antonius J. M. Withag, Peter J. Cool, Henk Fischer