Patents by Inventor Fuminori Sakai

Fuminori Sakai 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: 9537194
    Abstract: Chipless RFID tags and a tag system are provided, wherein the stepped impedance higher-order mode resonator includes two sets of composite transmission lines each set having an equal line length and including a plurality of transmission lines each having a plurality of specific levels to which the transmission line characteristic impedance is assigned, the two sets of composite transmission lines each connected in series, the sets being connected at the center to form an electrically symmetrical configuration and wherein the chipless RFID tags and the tag system allow each of the codes to be assigned to each of the structures of the stepped impedance higher-order mode resonator, and allow each of those codes to be identified by detecting each of the combinations of the higher-order mode resonance frequencies that may be produced from each the structures of the resonator that corresponds to each of the codes that have been assigned.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: January 3, 2017
    Assignee: SAKURA TECH CORPORATION
    Inventors: Mitsuo Makimoto, Fuminori Sakai
  • Publication number: 20150302231
    Abstract: Chipless RFID tags and a tag system are provided, wherein the stepped impedance higher-order mode resonator includes two sets of composite transmission lines each set having an equal line length and including a plurality of transmission lines each having a plurality of specific levels to which the transmission line characteristic impedance is assigned, the two sets of composite transmission lines each connected in series, the sets being connected at the center to form an electrically symmetrical configuration and wherein the chipless RFID tags and the tag system allow each of the codes to be assigned to each of the structures of the stepped impedance higher-order mode resonator, and allow each of those codes to be identified by detecting each of the combinations of the higher-order mode resonance frequencies that may be produced from each the structures of the resonator that corresponds to each of the codes that have been assigned.
    Type: Application
    Filed: December 17, 2014
    Publication date: October 22, 2015
    Applicant: SAKURA TECH CORPORATION
    Inventors: Mitsuo MAKIMOTO, Fuminori Sakai
  • Patent number: 8427372
    Abstract: Disclosed is an electronic scanning array antenna which can be used as a UWB radar having an occupied band of not less than 500 MHz. An impulse generator is connected to each of a plurality of antenna elements constituting the electronic scanning array antenna, and a transmission trigger time to each of the impulse generators connected to the antenna elements is changed, whereby the phase of radio waves emitted from an antenna is equivalently changed. Moreover, a transmission trigger repletion interval is changed to thereby control a direction of a beam emitted from the array antenna. As means of changing a transmission trigger timing to each of the impulse generators connected to the antenna elements, a method of changing a frequency of a transmission trigger pulse and a method of changing a pulse position are adopted.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: April 23, 2013
    Assignee: Sakura Tech Corporation
    Inventors: Fuminori Sakai, Kazuo Ohta
  • Publication number: 20110084880
    Abstract: Disclosed is an electronic scanning array antenna which can be used as a UWB radar having an occupied band of not less than 500 MHz. An impulse generator is connected to each of a plurality of antenna elements constituting the electronic scanning array antenna, and a transmission trigger time to each of the impulse generators connected to the antenna elements is changed, whereby the phase of radio waves emitted from an antenna is equivalently changed. Moreover, a transmission trigger repletion interval is changed to thereby control a direction of a beam emitted from the array antenna. As means of changing a transmission trigger timing to each of the impulse generators connected to the antenna elements, a method of changing a frequency of a transmission trigger pulse and a method of changing a pulse position are adopted.
    Type: Application
    Filed: December 7, 2009
    Publication date: April 14, 2011
    Inventors: Fuminori Sakai, Kazuo Ohta
  • Patent number: 5107223
    Abstract: A phase inverter includes first, second, third and fourth terminals, a first coupling circuit coupled between the first and second terminals, a second coupling circuit coupled between the second and third terminals, a third coupling circuit coupled between the third and fourth terminals, and a fourth coupling circuit coupled between the first and fourth terminals. The first to fourth terminals and the first to fourth coupling circuits are arranged into a ring. The first coupling circuit is of a type different from a type of the fourth coupling circuit. The second and third coupling circuits are identical in type. Two output signals having a phase difference of 180.degree. are drawn from the second and fourth terminal when an input terminal is applied to the first terminal, and an output signal is drawn from the first terminal when two input signals having a phase difference of 180.degree. are applied to the second and fourth terminals.
    Type: Grant
    Filed: January 18, 1990
    Date of Patent: April 21, 1992
    Assignee: Fujitsu Limited
    Inventors: Fuminori Sakai, Hidetake Suzuki
  • Patent number: 5028880
    Abstract: A microwave power amplifier includes first and second circuits each having first, second, third and fourth terminals. Each of the first and second circuits has functions of distributing an input signal to the second and third terminals and generating first and second output signals 180.degree. out of phase with each other through the second and third terminals, respectively, adding a first pair of 180.degree. out-of-phase input signals to the second and third terminals and outputting a first resultant signal through the first terminal, and adding a second pair of in-phase input signals to the second and third terminals and outputting a second resultant signal through the fourth terminal.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: July 2, 1991
    Assignee: Fujitsu Limited
    Inventor: Fuminori Sakai