Patents by Inventor Albert Ryu

Albert Ryu 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).

  • Non-foster active impedance circuit for electrically small antennas
    Patent number: 9960484
    Abstract: An antenna comprising: a driven element; an input feed coupled to the driven element wherein the input feed is configured to be connected to a receiver; a non-Foster circuit having a negative impedance, wherein the non-Foster circuit is configured to actively load the antenna at a location on the antenna other than at the input feed; and wherein the antenna fits within an imaginary sphere having a radius a, and wherein the product ka is less than 0.5, where k is a wave number.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: May 1, 2018
    Assignee: The United States of America as represented by Secretary of the Navy
    Inventors: Jia-Chi Samuel Chieh, Lu Xu, Albert Ryu, John D. Rockway, Diana Arceo, Justin A. Church
  • Non-Foster Active Impedance Circuit for Electrically Small Antennas
    Publication number: 20150318607
    Abstract: An antenna comprising: a driven element; an input feed coupled to the driven element wherein the input feed is configured to be connected to a receiver; a non-Foster circuit having a negative impedance, wherein the non-Foster circuit is configured to actively load the antenna at a location on the antenna other than at the input feed; and wherein the antenna may be contained within an imaginary sphere having a radius a, and wherein the product ka is less than 0.5, where k is a wave number.
    Type: Application
    Filed: July 7, 2015
    Publication date: November 5, 2015
    Inventors: Jia-Chi Samuel Chieh, Lu Xu, Albert Ryu, John D. Rockway, Diana Arceo, Justin A. Church