Patents by Inventor Shigemitsu Tomaki

Shigemitsu Tomaki 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: 11431071
    Abstract: A balun includes first to fourth lines and a stack. A plurality of first conductor layers forming the first and third lines are located in a first region in the stack. A plurality of second conductor layers forming the second and fourth lines are located in a second region in the stack. A ground conductor layer is located closer to the second region than to the first region. The plurality of second conductor layers include a conductor layer pair where a distance between two conductor layers is smallest.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: August 30, 2022
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Masahiro Tatematsu, Shuhei Sawaguchi, Shigemitsu Tomaki, Tetsuzo Goto, Takeshi Kijima
  • 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: 11283147
    Abstract: A directional coupler includes first to fourth terminals, a first line, a second line, a ground conductor portion, and a stack. The first line includes a first center portion, a first connecting portion, and a second connecting portion. The second line includes a second center portion, a third connecting portion, and a fourth connecting portion. A distance between the first and third connecting portions and a distance between the second and fourth connecting portions decrease toward the first and second center portions. The first to fourth terminals are located on a bottom surface of the stack.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: March 22, 2022
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Masahiro Tatematsu, Shuhei Sawaguchi, Shigemitsu Tomaki
  • 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
  • Publication number: 20210328317
    Abstract: A multilayered filter device includes a multilayer stack, a band pass filter, a first band elimination filter, and a second band elimination filter. The band pass filter and the first and second band elimination filters are each constructed using the multilayer stack. The band pass filter includes a plurality of first resonators with open ends. Each band elimination filter includes a connection path, and a second resonator coupled to the connection path. The connection path includes an impedance transformer. The second resonator includes a conductor line constituting a distributed constant line.
    Type: Application
    Filed: June 29, 2021
    Publication date: October 21, 2021
    Applicant: TDK CORPORATION
    Inventors: Yuta ASHIDA, Noriyuki HIRABAYASHI, Shigemitsu TOMAKI
  • Publication number: 20210242852
    Abstract: A balun includes first to fourth lines and a stack. A plurality of first conductor layers forming the first and third lines are located in a first region in the stack. A plurality of second conductor layers forming the second and fourth lines are located in a second region in the stack. A ground conductor layer is located closer to the second region than to the first region. The plurality of second conductor layers include a conductor layer pair where a distance between two conductor layers is smallest.
    Type: Application
    Filed: January 28, 2021
    Publication date: August 5, 2021
    Applicant: TDK CORPORATION
    Inventors: Yuta ASHIDA, Masahiro TATEMATSU, Shuhei SAWAGUCHI, Shigemitsu TOMAKI, Tetsuzo GOTO, Takeshi KIJIMA
  • Patent number: 11081767
    Abstract: A multilayered filter device includes a multilayer stack, a band pass filter, a first band elimination filter, and a second band elimination filter. The band pass filter and the first and second band elimination filters are each constructed using the multilayer stack. The band pass filter includes a plurality of first resonators with open ends. Each band elimination filter includes a connection path, and a second resonator coupled to the connection path. The connection path includes an impedance transformer. The second resonator includes a conductor line constituting a distributed constant line.
    Type: Grant
    Filed: March 12, 2020
    Date of Patent: August 3, 2021
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
  • Publication number: 20210234249
    Abstract: A directional coupler includes first to fourth terminals, a first line, a second line, a ground conductor portion, and a stack. The first line includes a first center portion, a first connecting portion, and a second connecting portion. The second line includes a second center portion, a third connecting portion, and a fourth connecting portion. A distance between the first and third connecting portions and a distance between the second and fourth connecting portions decrease toward the first and second center portions. The first to fourth terminals are located on a bottom surface of the stack.
    Type: Application
    Filed: January 22, 2021
    Publication date: July 29, 2021
    Applicant: TDK CORPORATION
    Inventors: Yuta ASHIDA, Masahiro TATEMATSU, Shuhei SAWAGUCHI, Shigemitsu TOMAKI
  • Patent number: 10957959
    Abstract: A band-pass filter includes first to sixth stage resonators. Each resonator includes a resonator conductor portion formed of a conductor line. The resonator conductor portion has a first end and a second end which are opposite ends of the conductor line. The resonator conductor portion of each of the first and sixth stage resonators includes a narrow portion, a first wide portion located between the narrow portion and the first end, and a second wide portion located between the narrow portion and the second end. Each of the first and sixth stage resonators is lower in unloaded Q than the other resonators.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: March 23, 2021
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
  • Patent number: 10950917
    Abstract: A dielectric filter includes a plurality of dielectric resonators. The dielectric filter further includes a plurality of resonator bodies corresponding to the plurality of dielectric resonators, and a peripheral dielectric portion lying around the plurality of resonator bodies. Each of the plurality of resonator bodies is formed of a first dielectric having a first relative permittivity. The peripheral dielectric portion is formed of a second dielectric having a second relative permittivity lower than the first relative permittivity. Each of the plurality of resonator bodies includes a plurality of individual elements separated from each other.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: March 16, 2021
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
  • Patent number: 10854939
    Abstract: A dielectric filter has a first input/output port, a second input/output port, an even number of dielectric resonators, and a capacitor for capacitively coupling the first input/output port and the second input/output port. The even number of dielectric resonators are provided between the first input/output port and the second input/output port in circuit configuration, and are configured so that two dielectric resonators adjacent to each other in circuit configuration are magnetically coupled to each other.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: December 1, 2020
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
  • Publication number: 20200303798
    Abstract: A multilayered filter device includes a multilayer stack, a band pass filter, a first band elimination filter, and a second band elimination filter. The band pass filter and the first and second band elimination filters are each constructed using the multilayer stack. The band pass filter includes a plurality of first resonators with open ends. Each band elimination filter includes a connection path, and a second resonator coupled to the connection path. The connection path includes an impedance transformer. The second resonator includes a conductor line constituting a distributed constant line.
    Type: Application
    Filed: March 12, 2020
    Publication date: September 24, 2020
    Applicant: TDK CORPORATION
    Inventors: Yuta ASHIDA, Noriyuki HIRABAYASHI, Shigemitsu TOMAKI
  • Patent number: 10784551
    Abstract: A band-pass filter includes a main body, five resonators, a shield, and a partition. The main body is formed of a dielectric. The partition is formed of a conductor. The five resonators are configured so that capacitive coupling is established between every two of the resonators adjacent to each other in circuit configuration. Each of the five resonators includes a resonator conductor portion. A first stage resonator and a fifth stage resonator are magnetically coupled to each other although not adjacent to each other in circuit configuration. The partition extends to pass between the respective resonator conductor portions of the first stage resonator and the fifth stage resonator, and is electrically connected to the shield.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: September 22, 2020
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
  • Patent number: 10749234
    Abstract: A band-pass filter includes five resonators. The five resonators are configured so that capacitive coupling is established between every two of the resonators adjacent to each other in circuit configuration. The first stage resonator and the fifth stage resonator are magnetically coupled to each other. The second stage resonator and the fourth stage resonator are capacitively coupled to each other. Each of the five resonators includes a resonator conductor portion. The respective resonator conductor portions of the first and fifth stage resonators are physically adjacent to each other. The respective resonator conductor portions of the second and fourth stage resonators are physically adjacent to each other. The respective resonator conductor portions of the first and second stage resonators are physically adjacent to each other. The respective resonator conductor portions of the fourth and fifth stage resonators are physically adjacent to each other.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: August 18, 2020
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
  • Patent number: 10727557
    Abstract: A dielectric filter includes a plurality of dielectric resonators. The dielectric filter also includes: a plurality of resonator body portions each formed of a first dielectric and respectively corresponding to the plurality of dielectric resonators, the first dielectric having a first relative permittivity; a peripheral dielectric portion formed of a second dielectric and lying around the plurality of resonator body portions, the second dielectric having a second relative permittivity lower than the first relative permittivity; and a shield portion formed of a conductor. Either one of a temperature coefficient of resonant frequency of the first dielectric at 25° C. to 85° C. and a temperature coefficient of resonant frequency of the second dielectric at 25° C. to 85° C. has a positive value and the other has a negative value.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: July 28, 2020
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Shigemitsu Tomaki, Yousuke Futamata, Shin Takane, Yasuharu Miyauchi, Kazunari Kimura
  • Patent number: 10658720
    Abstract: A multilayer electronic component includes a multilayer stack, and a band elimination filter formed using the multilayer stack. The band elimination filter includes a first input/output end, a second input/output end, a connection path connecting the first and second input/output ends, and a resonator coupled to the connection path. The connection path includes an impedance transformer. The resonator includes a first conductor line constituting a first distributed constant line. The impedance transformer includes a second conductor line constituting a second distributed constant line, and a through hole line section connected in series to the second conductor line.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: May 19, 2020
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Noriyuki Hirabayashi, Shigemitsu Tomaki
  • Publication number: 20200106148
    Abstract: A band-pass filter includes first to sixth stage resonators. Each resonator includes a resonator conductor portion formed of a conductor line. The resonator conductor portion has a first end and a second end which are opposite ends of the conductor line. The resonator conductor portion of each of the first and sixth stage resonators includes a narrow portion, a first wide portion located between the narrow portion and the first end, and a second wide portion located between the narrow portion and the second end. Each of the first and sixth stage resonators is lower in unloaded Q than the other resonators.
    Type: Application
    Filed: August 27, 2019
    Publication date: April 2, 2020
    Applicant: TDK CORPORATION
    Inventors: Yuta ASHIDA, Noriyuki HIRABAYASHI, Shigemitsu TOMAKI
  • Publication number: 20190326654
    Abstract: A dielectric filter includes a plurality of dielectric resonators. The dielectric filter further includes a plurality of resonator bodies corresponding to the plurality of dielectric resonators, and a peripheral dielectric portion lying around the plurality of resonator bodies. Each of the plurality of resonator bodies is formed of a first dielectric having a first relative permittivity. The peripheral dielectric portion is formed of a second dielectric having a second relative permittivity lower than the first relative permittivity. Each of the plurality of resonator bodies includes a plurality of individual elements separated from each other.
    Type: Application
    Filed: March 13, 2019
    Publication date: October 24, 2019
    Applicant: TDK CORPORATION
    Inventors: Yuta ASHIDA, Noriyuki HIRABAYASHI, Shigemitsu TOMAKI
  • Patent number: 10432161
    Abstract: A band-pass filter includes a main body formed of a dielectric, a plurality of resonators, a shield, and a partition formed of a conductor. Each of the plurality of resonators includes a resonator conductor portion. The resonator conductor portion has a first end and a second end opposite to each other in the longitudinal direction. The first end is connected to a ground, and the second end is open. The partition extends to pass through between the respective resonator conductor portions of two resonators, and is electrically connected to the shield.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: October 1, 2019
    Assignee: TDK CORPORATION
    Inventors: Yuta Ashida, Naoki Sotoma, Shigemitsu Tomaki, Yasuyuki Hiwatashi
  • Publication number: 20190252753
    Abstract: A dielectric filter includes a plurality of dielectric resonators. The dielectric filter also includes: a plurality of resonator body portions each formed of a first dielectric and respectively corresponding to the plurality of dielectric resonators, the first dielectric having a first relative permittivity; a peripheral dielectric portion formed of a second dielectric and lying around the plurality of resonator body portions, the second dielectric having a second relative permittivity lower than the first relative permittivity; and a shield portion formed of a conductor. Either one of a temperature coefficient of resonant frequency of the first dielectric at 25° C. to 85° C. and a temperature coefficient of resonant frequency of the second dielectric at 25° C. to 85° C. has a positive value and the other has a negative value.
    Type: Application
    Filed: December 20, 2018
    Publication date: August 15, 2019
    Applicant: TDK CORPORATION
    Inventors: Yuta ASHIDA, Shigemitsu TOMAKI, Yousuke FUTAMATA, Shin TAKANE, Yasuharu MIYAUCHI, Kazunari KIMURA