Patents by Inventor Ramakrishna Janaswamy

Ramakrishna Janaswamy 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).

  • System and method for adaptive correction to phased array antenna array coefficients through dithering and near-field sensing
    Patent number: 8299964
    Abstract: A system and method of adaptively correcting the excitation or receive coefficients for a phased array antenna. For a transmitting antenna, a sensor located in the near field of the antenna is used to sense the antenna transmission. A reference signal that represents the sensor response to a desired antenna transmission that is accomplished with predetermined excitation coefficients is determined. The magnitudes and phases of the excitation coefficients are modified in a predetermined manner to create a modified antenna transmission. An actual signal that represents the sensor response to the modified antenna transmission is then determined. The excitation coefficients are then corrected using the differences between the reference signal and the actual signal, such that the modified antenna transmission becomes closer to the desired antenna transmission. The method and system also apply to a receiving antenna.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: October 30, 2012
    Assignees: University of Massachusetts, Newlans, Inc.
    Inventors: Ramakrishna Janaswamy, Dev Vrat Gupta
  • System and Method for Adaptive Correction to Phased Array Antenna Array Coefficients Through Dithering and Near-Field Sensing
    Publication number: 20110205117
    Abstract: A system and method of adaptively correcting the excitation or receive coefficients for a phased array antenna. For a transmitting antenna, a sensor located in the near field of the antenna is used to sense the antenna transmission. A reference signal that represents the sensor response to a desired antenna transmission that is accomplished with predetermined excitation coefficients is determined. The magnitudes and phases of the excitation coefficients are modified in a predetermined manner to create a modified antenna transmission. An actual signal that represents the sensor response to the modified antenna transmission is then determined. The excitation coefficients are then corrected using the differences between the reference signal and the actual signal, such that the modified antenna transmission becomes closer to the desired antenna transmission. The method and system also apply to a receiving antenna.
    Type: Application
    Filed: February 19, 2010
    Publication date: August 25, 2011
    Inventors: Ramakrishna Janaswamy, Dev Vrat Gupta