Patents by Inventor Koji Tsukashima
Koji Tsukashima 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).
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Patent number: 11646711Abstract: A filter circuit includes a branch line coupler and a balun circuit having an input terminal connected to the branch line coupler to receive a signal, a first line connected to the input terminal and having a length comparable to a quarter of an electrical length of one wavelength at a frequency of the signal, a second line connected to the input terminal and having a length comparable to the quarter, a third line connected to the second line and having a length comparable to the quarter, and a fourth line connected to the third line and electromagnetically coupled to the first line, the fourth line having a length comparable to the quarter, wherein an end of the first line and an end of the fourth line are both connected to a ground or open-circuited, or are connected to two respective terminating resistors whose resistance values are equal.Type: GrantFiled: August 18, 2021Date of Patent: May 9, 2023Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Koji Tsukashima
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Publication number: 20220069794Abstract: A filter circuit includes a branch line coupler and a balun circuit having an input terminal connected to the branch line coupler to receive a signal, a first line connected to the input terminal and having a length comparable to a quarter of an electrical length of one wavelength at a frequency of the signal, a second line connected to the input terminal and having a length comparable to the quarter, a third line connected to the second line and having a length comparable to the quarter, and a fourth line connected to the third line and electromagnetically coupled to the first line, the fourth line having a length comparable to the quarter, wherein an end of the first line and an end of the fourth line are both connected to a ground or open-circuited, or are connected to two respective terminating resistors whose resistance values are equal.Type: ApplicationFiled: August 18, 2021Publication date: March 3, 2022Inventor: Koji TSUKASHIMA
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Patent number: 9543630Abstract: An electronic device comprises a divider and a first filter. The divider comprises a first terminal for inputting a high-frequency signal, a second terminal coupled to the first terminal, and third and fourth terminals for distributing thereto the signal inputted from the first terminal. The first filter is coupled to the second terminal.Type: GrantFiled: June 11, 2015Date of Patent: January 10, 2017Assignees: Sumitomo Electric Industries, Ltd., Sumitomo Electric Device Innovations, Inc.Inventors: Tsuneo Tokumitsu, Koji Tsukashima, Seiji Fujita
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Publication number: 20150364805Abstract: An electronic device comprises a divider and a first filter. The divider comprises a first terminal for inputting a high-frequency signal, a second terminal coupled to the first terminal, and third and fourth terminals for distributing thereto the signal inputted from the first terminal. The first filter is coupled to the second terminal.Type: ApplicationFiled: June 11, 2015Publication date: December 17, 2015Inventors: Tsuneo TOKUMITSU, Koji TSUKASHIMA, Seiji FUJITA
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Patent number: 8680898Abstract: A multiplier circuit including; a 90 degrees coupler that divides an input signal into a first input signal and a second input signal of which phase difference of a base wave is 90 degrees; a first transistor that receives the first input signal and outputs a first output signal including at least a doubled wave and a tripled wave of the first input signal; a second transistor that receives the second input signal and outputs a second output signal including at least a doubled wave and a tripled wave of the second input signal; and a combiner that restrains leakage of the first output signal or the second output signal from one of the first transistor and the second transistor to the other, combines the first output signal and the second output signal, and outputs an output signal of the tripled wave.Type: GrantFiled: February 9, 2012Date of Patent: March 25, 2014Assignee: Sumitomo Electric Industries, Ltd.Inventor: Koji Tsukashima
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Patent number: 8421537Abstract: An electronic circuit includes: a first transistor having a control terminal, a first terminal, and a second terminal; a second transistor having a control terminal connected to the second terminal of the first transistor, a first terminal, and a second terminal connected to a DC power supply; a plurality of DC paths that are mutually independent of each other and supply DC currents from the first terminal of the second transistor to the second terminal of the first transistor; and distributed constant lines connected in series with the plurality of DC paths.Type: GrantFiled: November 28, 2011Date of Patent: April 16, 2013Assignee: Sumitomo Electric Industries, Ltd.Inventor: Koji Tsukashima
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Publication number: 20120200333Abstract: A multiplier circuit including; a 90 degrees coupler that divides an input signal into a first input signal and a second input signal of which phase difference of a base wave is 90 degrees; a first transistor that receives the first input signal and outputs a first output signal including at least a doubled wave and a tripled wave of the first input signal; a second transistor that receives the second input signal and outputs a second output signal including at least a doubled wave and a tripled wave of the second input signal; and a combiner that restrains leakage of the first output signal or the second output signal from one of the first transistor and the second transistor to the other, combines the first output signal and the second output signal, and outputs an output signal of the tripled wave.Type: ApplicationFiled: February 9, 2012Publication date: August 9, 2012Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Koji Tsukashima
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Publication number: 20120133441Abstract: An electronic circuit includes: a first transistor having a control terminal, a first terminal, and a second terminal; a second transistor having a control terminal connected to the second terminal of the first transistor, a first terminal, and a second terminal connected to a DC power supply; a plurality of DC paths that are mutually independent of each other and supply DC currents from the first terminal of the second transistor to the second terminal of the first transistor; and distributed constant lines connected in series with the plurality of DC paths.Type: ApplicationFiled: November 28, 2011Publication date: May 31, 2012Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Koji Tsukashima
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Publication number: 20110241803Abstract: A signal transmission line includes a dielectric substrate having first and second surfaces opposite to each other, a first conductor layer provided between the first surface and the second surface and set at a ground potential, a first transmission line having a signal conductor that is provided on the first surface and has a capacitive coupling with the first conductor layer, a second transmission line provided on the second surface, and a connecting conductor that passes through the dielectric substrate and connects the signal conductor of the first transmission line and the second transmission line. The first conductor layer has a first opening in which the connecting conductor is located. A distance between the first conductor layer and the connecting conductor in a first direction in which the signal conductor extends is smaller than a distance between the first conductor layer and the connecting conductor in a second direction orthogonal to the first direction.Type: ApplicationFiled: March 31, 2011Publication date: October 6, 2011Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Koji Tsukashima
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Patent number: 7067743Abstract: A transmission line includes a transmission line substrate, a signal line, and a first ground pattern that is provided on the transmission line substrate and is located between the transmission line substrate and a metal wire used to connect the signal line to a component.Type: GrantFiled: September 17, 2003Date of Patent: June 27, 2006Assignee: Fujitsu Quantum Devices LimitedInventor: Koji Tsukashima
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Publication number: 20040050587Abstract: A transmission line includes a transmission line substrate, a signal line, and a first ground pattern that is provided on the transmission line substrate and is located between the transmission line substrate and a metal wire used to connect the signal line to a component.Type: ApplicationFiled: September 17, 2003Publication date: March 18, 2004Applicant: FUJITSU QUANTUM DEVICES LIMITEDInventor: Koji Tsukashima