Patents by Inventor Daniel H. Koyama

Daniel H. Koyama 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).

  • High speed monolithic microwave integrated circuit (MMIC) quadrature phase shift keying (QPSK) and quadrature amplitude modulation (QAM) modulators
    Patent number: 7065153
    Abstract: In a system for modulating an RF carrier, the RF carrier is fed through a lowpass filter and phase shifted approximately ?90 degrees. The RF carrier is also fed through a high pass filter and phase shifted approximately +90 degrees. A switch connected to the output of the lowpass filter and connected to the output of the highpass filter, selects and outputs either the ?90 degree phase shifted carrier output from the lowpass filter or the +90 degree phase shifted carrier output from the highpass filter depending on a switching state determined by data bit information received at a data port to produce a BPSK modulated RF carrier. Two such BPSK modulators may be combined using lowpass and highpass filters to form a QPSK modulator. Two such QPSK modulators may be combined with an attenuator to form a QAM modulator.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: June 20, 2006
    Assignee: The Boeing Company
    Inventors: Susan E. Bach, Kurt W. Loheit, Remy O. Hiramoto, Daniel H. Koyama, Suzanne E. Kubasek, Craig Schulz
  • High speed QPSK MMIC and QAM modulator
    Publication number: 20030147472
    Abstract: In a system for modulating an RF carrier, the RF carrier is fed through a lowpass filter and phase shifted approximately −90 degrees. The RF carrier is also fed through a high pass filter and phase shifted approximately +90 degrees. A switch connected to the output of the lowpass filter and connected to the output of the highpass filter, selects and outputs either the −90 degree phase shifted carrier output from the lowpass filter or the +90 degree phase shifted carrier output from the highpass filter depending on a switching state determined by data bit information received at a data port to produce a BPSK modulated RF carrier. Two such BPSK modulators may be combined using lowpass and highpass filters to form a QPSK modulator. Two such QPSK modulators may be combined with an attenuator to form a QAM modulator.
    Type: Application
    Filed: February 6, 2002
    Publication date: August 7, 2003
    Applicant: The Boeing Company
    Inventors: Susan E. Bach, Kurt W. Loheit, Remy O. Hiramoto, Daniel H. Koyama, Suzanne E. Kubasek, Craig Schulz