Patents by Inventor Fumio Watanbe

Fumio Watanbe 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).

  • Interference cancellation system
    Patent number: 4893350
    Abstract: An interference cancellation system has a combiner which removes an undesired component from a main signal including both a desired signal and an undesired signal received by a main antenna. A power sensor measures output power of a main signal. A weight control circuit is coupled with an output of the power sensor. An auxiliary antenna receives an undesired signal. A variable complex weight control circuit adjusts an undesired signal from the auxiliary antenna according to the output of the weight control circuit to provide an input signal to the combiner. The variable complex weight control circuit operates so that the output power becomes a minimum.
    Type: Grant
    Filed: March 14, 1988
    Date of Patent: January 9, 1990
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Kenichi Minamisono, Masayuki Yasunaga, Fumio Watanbe, Noboru Baba