Patents by Inventor David Da-Wei Liu

David Da-Wei Liu 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).

  • Three dimensional reconfigurable photoconductive antenna array element
    Patent number: 5926148
    Abstract: First and second tandemly positioned electrically biased semiconductor members radiate microwave energy in response to the receipt of an excitation light beam having two wavelengths related to the bandgaps of the members. The projected microwave beam may be made more narrow and directional if two of the members are electrically biased at the same time. An inefficient frequency doubler generates the two wavelength beam enabling a single light beam to excite both members in a simple, rugged photoconductive antenna element.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: July 20, 1999
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: David Da-Wei Liu, Paul H. Carr, Steven D. Mittleman