Patents by Inventor Chul Sang Yoon

Chul Sang Yoon 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 combining radio frequency transmitter and receiver using circulator and method for canceling transmission signal thereof
    Patent number: 6567648
    Abstract: A transmitter/receiver combination system and a transmission signal canceling method for use in a wireless communication system using a single common antenna are provided. The system includes a circulator for receiving an original transmission signal from the transmitter, transmitting the received transmission signal to an antenna without a signal loss, and transmitting a reception signal received from the antenna to other ends without a signal loss, and a transmission signal canceller for dividing the transmission signal input in an attenuated form as much as a predetermined magnitude via the circulator together with the reception signal into two paths, producing two is phase inverted transmission signals with the same magnitude and delay time as those of the original transmission signal, and recombining the produced two transmission signals with each other, to thereby canceling the transmission signal and transmitting only the reception signal to the receiver.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: May 20, 2003
    Assignees: Telwave, Inc.
    Inventors: Dal Ahn, Jun Seok Park, Jong Chul Park, Chul Sang Yoon, Won Jun Kwak