Patents by Inventor Michael Tamamoto

Michael Tamamoto 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).

  • Patent number: 7304607
    Abstract: A high-directivity transponder system uses a dual system of a retrodirective array transmitting a data signal peak toward an interrogator source, and a self-null-steering array transmitting a null toward the interrogator source and a jamming signal elsewhere, resulting in high S/N reception at the interrogator source and avoidance of interception. Integrating modulators would allow each array to transmit different data while the spectra of the transmitted signals are identical, thus disabling interception. The system enables secure point-to-point communications and can be used for short-distance wireless data transmission systems such as wireless LAN and RFID servers.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: December 4, 2007
    Assignee: University of Hawai'i
    Inventors: Ryan Y. Miyamoto, Wayne A. Shiroma, Grant S. Shiroma, Blaine T. Murakami, Aaron Ohta, Michael Tamamoto
  • Publication number: 20060238414
    Abstract: A high-directivity transponder system uses a dual system of a retrodirective array transmitting a data signal peak toward an interrogator source, and a self-null-steering array transmitting a null toward the interrogator source and a jamming signal elsewhere, resulting in high S/N reception at the interrogator source and avoidance of interception. Integrating modulators would allow each array to transmit different data while the spectra of the transmitted signals are identical, thus disabling interception. The system enables secure point-to-point communications and can be used for short-distance wireless data transmission systems such as wireless LAN and RFID servers. As another aspect, self-steering signal transmission is employed for randomly oriented satellites using circularly polarized, two-dimensional retrodirective arrays. Quadruple subharmonic mixing is used as an effective means of achieving phase conjugation when a high-frequency LO is not feasible or inapplicable.
    Type: Application
    Filed: December 6, 2005
    Publication date: October 26, 2006
    Inventors: Ryan Miyamoto, Wayne Shiroma, Grant Shiroma, Blaine Murakami, Aaron Ohta, Michael Tamamoto
  • Patent number: 7006039
    Abstract: A high-directivity transponder system uses a dual system of a retrodirective array transmitting a data signal peak toward an interrogator source, and a self-null-steering array transmitting a null toward the interrogator source and a jamming signal elsewhere, resulting in high S/N reception at the interrogator source and avoidance of interception. Integrating modulators would allow each array to transmit different data while the spectra of the transmitted signals are identical, thus disabling interception. The system enables secure point-to-point communications and can be used for short-distance wireless data transmission systems such as wireless LAN and RFID servers. As another aspect, self-steering signal transmission is employed for randomly oriented satellites using circularly polarized, two-dimensional retrodirective arrays. Quadruple subharmonic mixing is used as an effective means of achieving phase conjugation when a high-frequency LO is not feasible or inapplicable.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: February 28, 2006
    Assignee: University of Hawaii
    Inventors: Ryan Y. Miyamoto, Wayne A. Shiroma, Grant S. Shiroma, Blaine T. Murakami, Aaron Ohta, Michael Tamamoto
  • Publication number: 20050030226
    Abstract: A high-directivity transponder system uses a dual system of a retrodirective array transmitting a data signal peak toward an interrogator source, and a self-null-steering array transmitting a null toward the interrogator source and a jamming signal elsewhere, resulting in high S/N reception at the interrogator source and avoidance of interception. Integrating modulators would allow each array to transmit different data while the spectra of the transmitted signals are identical, thus disabling interception. The system enables secure point-to-point communications and can be used for short-distance wireless data transmission systems such as wireless LAN and RFID servers. As another aspect, self-steering signal transmission is employed for randomly oriented satellites using circularly polarized, two-dimensional retrodirective arrays. Quadruple subharmonic mixing is used as an effective means of achieving phase conjugation when a high-frequency LO is not feasible or inapplicable.
    Type: Application
    Filed: August 4, 2004
    Publication date: February 10, 2005
    Inventors: Ryan Miyamoto, Wayne Shiroma, Grant Shiroma, Blaine Murakami, Aaron Ohta, Michael Tamamoto