Patents by Inventor Yuen T. Lo

Yuen T. Lo 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).

  • Dual frequency microstrip antenna
    Patent number: 4771291
    Abstract: A single element patch microstrip antenna for dual frequency operation is disclosed. By placing shorting pins at appropriate locations in the patch, the ratio of two band frequencies can be varied from 3 to 1.8. By also introducing slots in the patch, the ratio can be reduced from 3 to less than 1.3. A second embodiment of the antenna uses a c-shaped slot to obtain an even smaller ratio of two band frequencies.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: September 13, 1988
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Yuen T. Lo, Boa F. Wang
  • Multifunctional microstrip antennas
    Patent number: 4728960
    Abstract: A microstrip antenna system that is capable of simultaneously transmitting an outgoing circularly polarized wave while receiving an incoming circularly polarized wave using a microstrip patch antenna element and a signal processing network is disclosed. The signal processing system connects the antenna element to a transmitter and receiver and produces a phase-shifted transmitted signal in order to isolate the receiver from the transmitted signal by nulling it.
    Type: Grant
    Filed: June 10, 1986
    Date of Patent: March 1, 1988
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Yuen T. Lo