Patents by Inventor Doo Hee Song

Doo Hee Song 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).

  • Time division duplexing transmission/reception apparatus and method using polarized duplexer
    Patent number: 7650121
    Abstract: A time division duplexing (TDD) transmission/reception apparatus and method are provided. The TDD transmission/reception apparatus includes: a transmitter which generates a transmitted signal; an antenna which transmits the transmitted signal to an external device and receives a received signal from an external device; a receiver which restores source data by demodulating the received signal; and a polarized duplexer which has a first end connected to the transmitter and the receiver and a second end connected to the antenna and comprises an inclined surface, the inclined surface polarizing the transmitted signal and the received signal such that the directivity of the transmitted signal and the directivity of the received signal are perpendicular to each other.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: January 19, 2010
    Assignee: Industry - University Cooperation Foundation Sogang University
    Inventors: Kie Jin Lee, Jong Cheol Kim, Doo Hee Song