Patents by Inventor Tatsuya Tsujiguchi

Tatsuya Tsujiguchi 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: 20200195295
    Abstract: A transmit/receive module includes plural duplexers, a power amplifier, and a sending transmission line. The plural duplexers operate in bands different from each other and each includes a transmit filter and a receive filter. The power amplifier amplifies signals of pass bands of the plural transmit filters and outputs the amplified signals. The sending transmission line is connected to the plural transmit filters. The signals of the pass bands of the plural transmit filters output from the power amplifier are transmitted through the sending transmission line.
    Type: Application
    Filed: December 12, 2019
    Publication date: June 18, 2020
    Inventors: Seima KONDO, Satoshi TANAKA, Satoshi ARAYASHIKI, Hiroyuki FURUSATO, Jin YOKOYAMA, Toru YAMAJI, Akio KANEDA, Kiwamu SAKANO, Junichi YOSHIOKA, Tatsuya TSUJIGUCHI, Atushi ONO
  • Patent number: 10027353
    Abstract: A high-frequency front end circuit includes a duplexer, a phase adjustment circuit, and a power amplifier. The phase adjustment circuit is connected between the power amplifier and a transmission filter of the duplexer. The phase adjustment circuit carries out phase adjustment so that a quadrant in which an impedance ZRX (fr0) seen from the transmission filter toward the power amplifier at the fundamental frequency of a reception signal is present and a quadrant in which an impedance ZTX (fr0) seen from the power amplifier toward the transmission filter at the fundamental frequency of the reception signal is present are not in a conjugate relationship with respect to the phase.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: July 17, 2018
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takanori Uejima, Hiromichi Kitajima, Saneaki Ariumi, Hisao Hayafuji, Tatsuya Tsujiguchi
  • Patent number: 9960898
    Abstract: A radio frequency front-end circuit includes a duplexer, a phase adjustment circuit, and a low noise amplifier. The phase adjustment circuit is connected between an Rx filter of the duplexer and the low noise amplifier. The phase adjustment circuit executes phase adjustment such that a quadrant in which an impedance ZLNA(fn) at a particular frequency different from a fundamental frequency of a reception signal when looking at the low noise amplifier side from the Rx filter is present and a quadrant in which an impedance ZRX(fn) at the particular frequency when looking at the Rx filter side from the low noise amplifier is present are not in a conjugate relation in terms of phase.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: May 1, 2018
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takanori Uejima, Hiromichi Kitajima, Saneaki Ariumi, Hisao Hayafuji, Tatsuya Tsujiguchi
  • Publication number: 20160352365
    Abstract: A high-frequency front end circuit includes a duplexer, a phase adjustment circuit, and a power amplifier. The phase adjustment circuit is connected between the power amplifier and a transmission filter of the duplexer. The phase adjustment circuit carries out phase adjustment so that a quadrant in which an impedance ZRX (fr0) seen from the transmission filter toward the power amplifier at the fundamental frequency of a reception signal is present and a quadrant in which an impedance ZTX (fr0) seen from the power amplifier toward the transmission filter at the fundamental frequency of the reception signal is present are not in a conjugate relationship with respect to the phase.
    Type: Application
    Filed: August 12, 2016
    Publication date: December 1, 2016
    Inventors: Takanori UEJIMA, Hiromichi KITAJIMA, Saneaki ARIUMI, Hisao HAYAFUJI, Tatsuya TSUJIGUCHI
  • Publication number: 20160352494
    Abstract: A radio frequency front-end circuit includes a duplexer, a phase adjustment circuit, and a low noise amplifier. The phase adjustment circuit is connected between an Rx filter of the duplexer and the low noise amplifier. The phase adjustment circuit executes phase adjustment such that a quadrant in which an impedance ZLNA(fn) at a particular frequency different from a fundamental frequency of a reception signal when looking at the low noise amplifier side from the Rx filter is present and a quadrant in which an impedance ZRX(fn) at the particular frequency when looking at the Rx filter side from the low noise amplifier is present are not in a conjugate relation in terms of phase.
    Type: Application
    Filed: August 12, 2016
    Publication date: December 1, 2016
    Inventors: Takanori UEJIMA, Hiromichi KITAJIMA, Saneaki ARIUMI, Hisao HAYAFUJI, Tatsuya TSUJIGUCHI
  • Patent number: 8686811
    Abstract: A stripline filter having a substrate, a grounding electrode, principal-surface lines, side-surface lines, and common electrodes, and is mounted on a set substrate by soldering. The side-surface lines are disposed on a side surface of the substrate, and are wetted by solder during soldering. Each of the common electrodes is connected to a corresponding one of the principal-surface lines. The common electrodes are also connected to the grounding electrode via the side-surface lines.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: April 1, 2014
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yasunori Takei, Tatsuya Tsujiguchi, Motoharu Hiroshima
  • Patent number: 8008995
    Abstract: The element size of a stripline filter that achieves a high efficiency percentage with optional stable filter characteristics, is reduced. A stripline filter includes substantially L-shaped top surface resonant lines. The top surface resonant lines include connection electrode parts, first line parts, and second line parts. The connection electrode parts are formed so as to have a width greater than line widths of side surface resonant lines. Each line part faces an edge of a corner portion of a central top surface resonant line at an interval. An edge of each first line part on an edge side of a dielectric substrate, other than a connection portion with the connection electrode part, faces an edge of the dielectric substrate at an interval.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: August 30, 2011
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Nobuyoshi Honda, Tatsuya Tsujiguchi, Yasunori Takei
  • Publication number: 20100265012
    Abstract: The element size of a stripline filter that achieves a high efficiency percentage with optional stable filter characteristics, is reduced. A stripline filter includes substantially L-shaped top surface resonant lines. The top surface resonant lines include connection electrode parts, first line parts, and second line parts. The connection electrode parts are formed so as to have a width greater than line widths of side surface resonant lines. Each line part faces an edge of a corner portion of a central top surface resonant line at an interval. An edge of each first line part on an edge side of a dielectric substrate, other than a connection portion with the connection electrode part, faces an edge of the dielectric substrate at an interval.
    Type: Application
    Filed: June 4, 2010
    Publication date: October 21, 2010
    Inventors: Nobuyoshi Honda, Tatsuya Tsujiguchi, Yasunori Takei
  • Publication number: 20100182104
    Abstract: A stripline filter includes a ground electrode, input and output electrodes, top-surface resonant lines, side-surface resonant lines, side-surface line portions, connection electrode portions, and top-surface line portions. The ground electrode is provided on the bottom side of a dielectric substrate. The input and output electrodes are provided on the bottom surface of the substrate so as to be separate from the ground electrode. The top-surface resonant lines are provided on the top surface of the substrate. The side-surface line portions, the connection electrode portions, and the top-surface line portions connect two of the top-surface resonant lines to the input and output electrodes. The line width of the two top-surface resonant lines is smaller than the line width of the remainder of the top-surface resonant lines.
    Type: Application
    Filed: April 1, 2010
    Publication date: July 22, 2010
    Inventors: Yasunori Takei, Tatsuya Tsujiguchi, Nobuyoshi Honda
  • Patent number: 7629867
    Abstract: A filter element includes a flat dielectric substrate, a ground electrode on a back main surface of the dielectric substrate, resonant lines each having a shorting end in the vicinity of a border between a side of the dielectric substrate and the ground electrode and extending from the side to a front main surface of the dielectric substrate. The resonant lines and the ground electrode constitute strip-line resonators. In any of the strip-line resonators, the line width of the resonant-line side portion is different from the line width of the resonant-line main-surface portion.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: December 8, 2009
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tatsuya Tsujiguchi, Yukihiro Kitaichi
  • Publication number: 20080142251
    Abstract: A chip component is obtained by laminating a dielectric substrate, a first insulating layer provided on a principal surface of the dielectric substrate, and a second insulating layer covering substantially the entire first insulating layer. A circuit pattern includes a resonance line provided in an interface between the dielectric substrate and the first insulating layer. A plurality of through holes (H) are aligned n the first insulating layer along an extending direction of the circuit pattern at locations facing an area within the boundary of the circuit pattern.
    Type: Application
    Filed: February 26, 2008
    Publication date: June 19, 2008
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Tatsuya TSUJIGUCHI, Yukihiro KITAICHI
  • Publication number: 20080143458
    Abstract: A filter element includes a flat dielectric substrate, a ground electrode on a back main surface of the dielectric substrate, resonant lines each having a shorting end in the vicinity of a border between a side of the dielectric substrate and the ground electrode and extending from the side to a front main surface of the dielectric substrate. The resonant lines and the ground electrode constitute strip-line resonators. In any of the strip-line resonators, the line width of the resonant-line side portion is different from the line width of the resonant-line main-surface portion.
    Type: Application
    Filed: February 26, 2008
    Publication date: June 19, 2008
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Tatsuya TSUJIGUCHI, Yukihiro KITAICHI
  • Patent number: 6853265
    Abstract: A dielectric resonator device includes a dielectric plate. An electrode is provided on each of both principal surfaces of the dielectric plate and a plurality of pairs of mutually-opposing electrode openings are formed in the electrodes. Accordingly, the dielectric resonator device functions as a three-stage resonator. Strip lines serving as input/output probes are provided on the upper surface of an input/output substrate. Also, a ground electrode having electrode openings are formed thereon. By providing the dielectric resonator device and an upper substrate on the upper surface of the input/output substrate, a dielectric filter is formed.
    Type: Grant
    Filed: February 11, 2003
    Date of Patent: February 8, 2005
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Shigeji Arakawa, Tatsuya Tsujiguchi, Munehisa Watanabe, Yukihiro Kitaichi
  • Patent number: 6791434
    Abstract: A flat group-delay low-pass filter includes a series element connected between an input terminal and an output terminal, and a shunt element with one end thereof grounded. Inductors define the series element, a parallel circuit including a capacitor and a series circuit including a resistor and a capacitor defines the shunt element. The flat group-delay low-pass filter thus eliminates the need for inserting a fixed attenuator to control the effect of reflections due to impedance mismatching between the filter and other components. The resulting flat group-delay low-pass filter and an optical signal receiver including the filter have very low manufacturing costs and component costs.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: September 14, 2004
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tatsuya Tsujiguchi
  • Patent number: 6734760
    Abstract: A lumped filter includes an input terminal, an output terminal, and a ground electrode disposed on a dielectric film on an alumina substrate. A first spiral inductor is connected between the input terminal and the ground electrode. A second spiral inductor is connected between the output terminal and the ground electrode. MIM capacitors are inserted between the input terminal and the first spiral inductor, and between the output terminal and the second spiral inductor. A third spiral inductor is inserted between the first and second spiral inductors. The spiral inductors have self-inductance, and capacitance between the spiral inductors and the electrodes adjacent thereto, by which the spiral inductors self-resonate and define as parallel LC resonators.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: May 11, 2004
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tatsuya Tsujiguchi
  • Patent number: 6720849
    Abstract: The invention provides a high frequency filter which can facilitate filter-characteristic adjustments and miniaturization and can obtain an excellent broadband characteristic. In addition, the invention provides a filter device using the high frequency filter, and an electronic apparatus incorporating the same. In this filter, a ground electrode is arranged on one of the main surfaces of a dielectric substrate. On the other main surface thereof there are arranged two or more microstrip lines, and one end of each microstrip line is grounded via a through-hole to form a high frequency filter. The microstrip lines and the shared through-hole constitute microstrip line resonators, which are coupled via the inductance of the through-hole. With this arrangement, there is no need for an additional coupling element. Thus, the size of the high frequency filter can be reduced. Furthermore, since a large coupling coefficient can be obtained, the high frequency filter can have a broadband characteristic.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: April 13, 2004
    Assignee: Murata Manufacturing Co. Ltd.
    Inventors: Yutaka Sasaki, Akihide Nakano, Tatsuya Tsujiguchi, Hiroaki Tanaka
  • Patent number: 6694601
    Abstract: A method of adjusting characteristics of a dielectric filter including the following steps: forming a dielectric filter having a dielectric body, the dielectric body having an outer surface; forming an external conductor on the outer surface of the dielectric body; and forming at least one hole extending through the dielectric body, the at least one hole having a respective inner surface, and a respective internal conductor and a respective non-conductive portion at the inner surface; the outer surface of the dielectric body comprising first and second end surfaces and a side surface extending between the first and second end surfaces; the at least one hole extending through the dielectric body between the first and second end surfaces; the respective inner conductor being formed as a respective pair of internal conductors conductively connected to the external conductor at respective ends of the at least one hole, the respective non-conductive portion at the inner surface of the at least one hole being space
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: February 24, 2004
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Haruo Matsumoto, Yasuo Yamada, Yukihiro Kitaichi, Tadahiro Yorita, Hideyuki Kato, Tatsuya Tsujiguchi, Hisashi Mori, Hitoshi Tada
  • Patent number: 6642816
    Abstract: Resonator electrodes are provided on the upper face of a dielectric substrate. The ratios (W1/L1) and (W3/L3) of the electrode widths W1 and W3 to the electrode lengths L1 and L3 of the resonator electrodes of the first and last stages are set at substantially 1.05<W/L<1.95. Lead-out electrodes are connected to the resonator electrodes of the first and last stages on the opposite sides of the center axis which is a straight-line axis passing through the center positions of the resonator electrodes of the first and last stages. Thereby, an attenuation pole is generated on the lower band side of the pass-band.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: November 4, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tatsuya Tsujiguchi, Shigeji Arakawa
  • Publication number: 20030151475
    Abstract: A dielectric resonator device includes a dielectric plate. An electrode is provided on each of both principal surfaces of the dielectric plate and a plurality of pairs of mutually-opposing electrode openings are formed in the electrodes. Accordingly, the dielectric resonator device functions as a three-stage resonator. Strip lines serving as input/output probes are provided on the upper surface of an input/output substrate. Also, a ground electrode having electrode openings are formed thereon. By providing the dielectric resonator device and an upper substrate on the upper surface of the input/output substrate, a dielectric filter is formed.
    Type: Application
    Filed: February 11, 2003
    Publication date: August 14, 2003
    Inventors: Shigeji Arakawa, Tatsuya Tsujiguchi, Munehisa Watanabe, Yukihiro Kitaichi
  • Patent number: 6603373
    Abstract: A method is disclosed which allows the electrical characteristics of a microstrip line filter or the like to be reliably measured using a two-dimensional measuring jig, even if components thereof to be measured are small in size and are not discrete components. A first ground electrode is formed substantially over the entire bottom surface of a dielectric substrate, and resonator electrodes are disposed on the top surface of the dielectric substrate. Input/output electrodes are each connected to a first-stage resonator electrode and a last-stage resonator electrode. Second ground electrodes conductively connected to the first ground electrode are disposed beside each of the input/output electrodes. By this structure, each of the input/output portions is provided with a grounded coplanar guide configuration.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: August 5, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tatsuya Tsujiguchi