Patents by Inventor Yoshinori Matsumaru

Yoshinori Matsumaru 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).

  • Publication number: 20220209380
    Abstract: A band-pass filter includes a first input/output port, a second input/output port, a plurality of resonators, and a multilayer stack. The multilayer stack includes a plurality of stacked dielectric layers. Each of the resonators is an open-ended resonator formed of a conductor line in the multilayer stack. Each of the resonators includes a resonator conductor portion including a first line part and a second line part located away from each other in a direction orthogonal to a stacking direction of the plurality of dielectric layers, and a third line part connecting the first line part and the second line part. The first to third line parts extend to surround a space between the first line part and the second line part.
    Type: Application
    Filed: December 20, 2021
    Publication date: June 30, 2022
    Applicant: TDK CORPORATION
    Inventors: Honoka ATSUCHI, Yuta ASHIDA, Longfei YI, Yoshinori MATSUMARU, Shuhei SAWAGUCHI, Masahiro TATEMATSU, Shigemitsu TOMAKI
  • Patent number: 11276909
    Abstract: Disclosed herein is a nonreciprocal circuit element that includes a magnetic rotator disposed between first and second ground conductors, and a permanent magnet that applies a DC magnetic field to the magnetic rotator. The magnetic rotator includes a first ferrite core having a first surface covered with the first ground conductor, a second ferrite core having a second surface covered with the second ground conductor, a first center conductor directly fixed to a third surface of the first ferrite core positioned opposite to the first surface, and a second center conductor directly fixed to a fourth surface of the second ferrite core positioned opposite to the second surface.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: March 15, 2022
    Assignee: TDK CORPORATION
    Inventors: Hidenori Ohata, Yoshinori Matsumaru, Tomoaki Kawata
  • Publication number: 20210344320
    Abstract: A band-pass filter includes an unbalanced port, a first balanced port, a second balanced port, and first to third resonators provided between the unbalanced port and the first and second balanced ports. The second resonator and the third resonator each are a resonator with both ends open. The second resonator and the third resonator are adjacent to each other in a circuit configuration, and electromagnetically coupled by magnetic coupling as main coupling. The first resonator is provided closer to the second resonator than to the third resonator, and jump-coupled to the third resonator.
    Type: Application
    Filed: April 27, 2021
    Publication date: November 4, 2021
    Applicant: TDK CORPORATION
    Inventors: Shuhei SAWAGUCHI, Yuta ASHIDA, Masahiro TATEMATSU, Yoshinori MATSUMARU, Shigemitsu TOMAKI
  • Patent number: 10992014
    Abstract: Disclosed herein is a nonreciprocal circuit element that includes a permanent magnet, a magnetic material having an insulating property, a magnetic rotator sandwiched between the permanent magnet and the magnetic material, and an external terminal. The magnetic rotator includes a center conductor connected to the external terminal, and first and second ferrite cores sandwiching the center conductor. The external terminal covers a side surface of the magnetic material without covering a side surface of the permanent magnet.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: April 27, 2021
    Assignee: TDK CORPORATION
    Inventors: Hidenori Ohata, Yoshinori Matsumaru
  • Patent number: 10964994
    Abstract: Disclosed herein is a nonreciprocal circuit element that includes a magnetic rotator, and a permanent magnet that applies a DC magnetic field to the magnetic rotator. The magnetic rotator includes a center conductor, a first ferrite core laminated on the center conductor, and a dielectric provided in a gap formed between the center conductor and the first ferrite core.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: March 30, 2021
    Assignee: TDK CORPORATION
    Inventors: Hidenori Ohata, Yoshinori Matsumaru, Junichi Nakamura
  • Publication number: 20200295425
    Abstract: Disclosed herein is a nonreciprocal circuit element that includes a magnetic rotator disposed between first and second ground conductors, and a permanent magnet that applies a DC magnetic field to the magnetic rotator. The magnetic rotator includes a first ferrite core having a first surface covered with the first ground conductor, a second ferrite core having a second surface covered with the second ground conductor, a first center conductor directly fixed to a third surface of the first ferrite core positioned opposite to the first surface, and a second center conductor directly fixed to a fourth surface of the second ferrite core positioned opposite to the second surface.
    Type: Application
    Filed: March 13, 2020
    Publication date: September 17, 2020
    Inventors: Hidenori OHATA, Yoshinori MATSUMARU, Tomoaki KAWATA
  • Publication number: 20190386368
    Abstract: Disclosed herein is a nonreciprocal circuit element that includes a permanent magnet, a magnetic material having an insulating property, a magnetic rotator sandwiched between the permanent magnet and the magnetic material, and an external terminal. The magnetic rotator includes a center conductor connected to the external terminal, and first and second ferrite cores sandwiching the center conductor. The external terminal covers a side surface of the magnetic material without covering a side surface of the permanent magnet.
    Type: Application
    Filed: June 10, 2019
    Publication date: December 19, 2019
    Inventors: Hidenori OHATA, Yoshinori MATSUMARU
  • Publication number: 20190386369
    Abstract: Disclosed herein is a nonreciprocal circuit element that includes a magnetic rotator, and a permanent magnet that applies a DC magnetic field to the magnetic rotator. The magnetic rotator includes a center conductor, a first ferrite core laminated on the center conductor, and a dielectric provided in a gap formed between the center conductor and the first ferrite core.
    Type: Application
    Filed: June 10, 2019
    Publication date: December 19, 2019
    Inventors: Hidenori OHATA, Yoshinori MATSUMARU, Junichi NAKAMURA
  • Patent number: 6215371
    Abstract: A non-reciprocal circuit element includes a plurality of inner conductors intersecting with keeping insulation with each other, a shield conductor connected in common to one end of the inner conductors, and a capacitor connected between the shield conductor and a ground of the non-reciprocal circuit element, for adjusting only eigen values of in-phase excitation. Thus, smaller size, lighter weight and lower height can be attained and also temperature characteristics can be optionally adjusted without changing material used and without inviting increased insertion loss.
    Type: Grant
    Filed: July 16, 1999
    Date of Patent: April 10, 2001
    Assignee: TDK Corporation
    Inventors: Takahide Kurahashi, Hidenori Ohata, Akihito Watanabe, Yoshinori Matsumaru