Patents by Inventor Hidetoshi Matsumoto
Hidetoshi Matsumoto 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: 10535897Abstract: The object of the present invention is to provide the gelatinous, molten salt having a high ion-conductivity and an excellent heat resistance. The object of the present invention can be solved by the inorganic nanofibers having a functional group which inter-molecularly interacts with the molten salt on the surface thereof, and the molten salt composition comprising molten salt; or the method for increasing a viscosity of liquid molten salt characterized in that the inorganic nanofibers having a functional group which inter-molecularly interacts with the molten salt in the surface thereof is added to the liquid molten salt.Type: GrantFiled: February 26, 2016Date of Patent: January 14, 2020Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventors: Hidetoshi Matsumoto, Takahiro Yuki, Yoichi Tominaga, Hajime Matsumoto, Keigo Kubota
-
Patent number: 10454434Abstract: A communication unit includes a first input terminal to which a first transmission signal based on a first communication standard is input, a second input terminal to which a second transmission signal based on a second communication standard is input, a first transmission signal amplifier circuit outputting a first amplified transmission signal, or outputting a second amplified transmission signal, a first input-output terminal outputting the first amplified transmission signal or the second amplified transmission signal, and at least one of a first reception signal and a second reception signal inputted to the first input-output terminal, a first reception signal amplifier circuit performing at least one of operation of outputting a first amplified reception signal and operation of outputting a second amplified reception signal, a first output terminal outputting the first amplified reception signal, and a second output terminal outputting the second amplified reception signal.Type: GrantFiled: July 18, 2018Date of Patent: October 22, 2019Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Tsuyoshi Sato, Hidetoshi Matsumoto, Kiichiro Takenaka, Masahiro Ito, Satoshi Tanaka, Takahiro Katamata
-
Publication number: 20190253086Abstract: A high-frequency-signal transceiver circuit transmits and receives a signal between first to sixth antenna terminals and terminals near a high-frequency circuit. The high-frequency-signal transceiver circuit includes first to sixth circuits connected to the corresponding first to sixth antenna terminals. One of the first to sixth circuits transmits and receives only a signal of time division multiplexing communication.Type: ApplicationFiled: February 13, 2019Publication date: August 15, 2019Inventors: Tsuyoshi SATO, Hidetoshi MATSUMOTO, Kiichiro TAKENAKA, Masahiro ITO, Satoshi TANAKA
-
Publication number: 20190253096Abstract: First to fourth circuits are connected to corresponding first to fourth antenna terminals. The first to fourth circuits transmit and receive a signal of TDD and a signal of FDD. The first to fourth circuits transmit and receive a signal of MIMO. The third circuit receives a signal of a satellite positioning system. The lower limit of the frequency of the signal received by the third circuit and the fourth circuit is higher than the lower limit of the frequency of the signal received by the first circuit and the second circuit.Type: ApplicationFiled: February 5, 2019Publication date: August 15, 2019Inventors: Tsuyoshi SATO, Hidetoshi MATSUMOTO, Kiichiro TAKENAKA, Masahiro ITO, Satoshi TANAKA
-
Patent number: 10348248Abstract: Improvement in linearity is achieved at low costs in a power amplifier module employing an envelope tracking system. The power amplifier module includes a first power amplifier circuit that amplifies a radio frequency signal and that outputs a first amplified signal, a second power amplifier circuit that amplifies the first amplified signal on the basis of a source voltage varying depending on amplitude of the radio frequency signal and that outputs a second amplified signal, and a matching circuit that includes first and second capacitors connected in series between the first and second power amplifier circuit and an inductor connected between a node between the first and second capacitors and a ground and that decreases a gain of the first power amplifier circuit as the source voltage of the second power amplifier circuit increases.Type: GrantFiled: June 7, 2018Date of Patent: July 9, 2019Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kiichiro Takenaka, Masahiro Ito, Masakazu Hori, Mitsuo Ariie, Hayato Nakamura, Satoshi Arayashiki, Hidetoshi Matsumoto, Tsuyoshi Sato, Satoshi Tanaka
-
Publication number: 20190199298Abstract: A matching network is a matching network of a power amplifier circuit that outputs a signal obtained by a differential amplifier amplifying power of a high-frequency signal. The matching network includes an input-side winding connected between differential outputs of the differential amplifier; an output-side winding that is coupled to the input-side winding via an electromagnetic field and whose one end is connected to a reference potential; a first LC series resonant circuit including a capacitive element and an inductive element connected in series with each other, and being connected in parallel with the input-side winding; and a second LC series resonant circuit including a capacitive element and an inductive element connected in series with each other, and being connected in parallel with the output-side winding.Type: ApplicationFiled: December 12, 2018Publication date: June 27, 2019Inventors: Kiichiro TAKENAKA, Masahiro ITO, Tsuyoshi SATO, Kozo SATO, Hidetoshi MATSUMOTO
-
Publication number: 20190068129Abstract: A power amplifier circuit includes a Doherty amplifier including a divider that divides a first signal into a second signal and a third signal, a carrier amplifier that amplifies the second signal and outputs a fourth signal, a peak amplifier that amplifies the third signal and outputs a fifth signal, a combiner that combines the fourth signal and the fifth signal and outputs an amplified signal of the first signal, a first bias circuit that supplies a first bias current or voltage to the carrier amplifier, and a second bias circuit that supplies a second bias current or voltage corresponding to a control signal to the peak amplifier; and a control circuit that supplies the control signal corresponding to a level of the second signal to the second bias circuit. The control circuit includes a detecting unit, an output unit, and a filter circuit.Type: ApplicationFiled: August 24, 2018Publication date: February 28, 2019Inventors: Masahiro Ito, Tsuyoshi Sato, Kiichiro Takenaka, Hidetoshi Matsumoto
-
Publication number: 20190058444Abstract: A power amplifier module includes an amplifier transistor and a bias circuit. A first power supply voltage based on a first operation mode or a second power supply voltage based on a second operation mode is supplied to the amplifier transistor. The amplifier transistor receives a first signal and outputs a second signal obtained by amplifying the first signal. The bias circuit supplies a bias current to the amplifier transistor. The bias circuit includes first and second resistors and first and second transistors. The first transistor is connected in series with the first resistor and is turned ON by a first bias control voltage which is supplied when the first operation mode is used. The second transistor is connected in series with the second resistor and is turned ON by a second bias control voltage which is supplied when the second operation mode is used.Type: ApplicationFiled: October 24, 2018Publication date: February 21, 2019Inventors: Masao Kondo, Hidetoshi Matsumoto
-
Publication number: 20190028074Abstract: A communication unit includes a first input terminal to which a first transmission signal based on a first communication standard is input, a second input terminal to which a second transmission signal based on a second communication standard is input, a first transmission signal amplifier circuit outputting a first amplified transmission signal, or outputting a second amplified transmission signal, a first input-output terminal outputting the first amplified transmission signal or the second amplified transmission signal, and at least one of a first reception signal and a second reception signal inputted to the first input-output terminal, a first reception signal amplifier circuit performing at least one of operation of outputting a first amplified reception signal and operation of outputting a second amplified reception signal, a first output terminal outputting the first amplified reception signal, and a second output terminal outputting the second amplified reception signal.Type: ApplicationFiled: July 18, 2018Publication date: January 24, 2019Inventors: Tsuyoshi Sato, Hidetoshi Matsumoto, Kiichiro Takenaka, Masahiro Ito, Satoshi Tanaka, Takahiro Katamata
-
Patent number: 10141890Abstract: A power amplifier module includes an amplifier transistor and a bias circuit. A first power supply voltage based on a first operation mode or a second power supply voltage based on a second operation mode is supplied to the amplifier transistor. The amplifier transistor receives a first signal and outputs a second signal obtained by amplifying the first signal. The bias circuit supplies a bias current to the amplifier transistor. The bias circuit includes first and second resistors and first and second transistors. The first transistor is connected in series with the first resistor and is turned ON by a first bias control voltage which is supplied when the first operation mode is used. The second transistor is connected in series with the second resistor and is turned ON by a second bias control voltage which is supplied when the second operation mode is used.Type: GrantFiled: July 11, 2017Date of Patent: November 27, 2018Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Masao Kondo, Hidetoshi Matsumoto
-
Publication number: 20180337426Abstract: The object of the present invention is to provide the gelatinous, molten salt having a high ion-conductivity and an excellent heat resistance. The object of the present invention can be solved by the inorganic nanofibers having a functional group which inter-molecularly interacts with the molten salt on the surface thereof, and the molten salt composition comprising molten salt; or the method for increasing a viscosity of liquid molten salt characterized in that the inorganic nanofibers having a functional group which inter-molecularly interacts with the molten salt in the surface thereof is added to the liquid molten salt.Type: ApplicationFiled: February 26, 2016Publication date: November 22, 2018Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventors: Hidetoshi MATSUMOTO, Takahiro YUKI, Yoichi TOMINAGA, Hajime MATSUMOTO, Keigo KUBOTA
-
Publication number: 20180287565Abstract: Improvement in linearity is achieved at low costs in a power amplifier module employing an envelope tracking system. The power amplifier module includes a first power amplifier circuit that amplifies a radio frequency signal and that outputs a first amplified signal, a second power amplifier circuit that amplifies the first amplified signal on the basis of a source voltage varying depending on amplitude of the radio frequency signal and that outputs a second amplified signal, and a matching circuit that includes first and second capacitors connected in series between the first and second power amplifier circuit and an inductor connected between a node between the first and second capacitors and a ground and that decreases a gain of the first power amplifier circuit as the source voltage of the second power amplifier circuit increases.Type: ApplicationFiled: June 7, 2018Publication date: October 4, 2018Inventors: Kiichiro Takenaka, Masahiro Ito, Masakazu Hori, Mitsuo Ariie, Hayato Nakamura, Satoshi Arayashiki, Hidetoshi Matsumoto, Tsuyoshi Sato, Satoshi Tanaka
-
Patent number: 10090806Abstract: The power amplifier circuit includes a first amplifier that amplifies a first signal and outputs a second signal, a second amplifier that amplifies the second signal and outputs a third signal, a power supply terminal that receives supply of a power supply voltage that varies as a function of an amplitude of the first signal, a first power supply line that supplies the power supply voltage from the power supply terminal to the first amplifier, a second power supply line that supplies the power supply voltage from the power supply terminal to the second amplifier, and a first delay circuit provided in the second power supply line.Type: GrantFiled: August 11, 2017Date of Patent: October 2, 2018Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Tsuyoshi Sato, Hidetoshi Matsumoto
-
Patent number: 10020779Abstract: Improvement in linearity is achieved at low costs in a power amplifier module employing an envelope tracking system. The power amplifier module includes a first power amplifier circuit that amplifies a radio frequency signal and that outputs a first amplified signal, a second power amplifier circuit that amplifies the first amplified signal on the basis of a source voltage varying depending on amplitude of the radio frequency signal and that outputs a second amplified signal, and a matching circuit that includes first and second capacitors connected in series between the first and second power amplifier circuit and an inductor connected between a node between the first and second capacitors and a ground and that decreases a gain of the first power amplifier circuit as the source voltage of the second power amplifier circuit increases.Type: GrantFiled: August 30, 2016Date of Patent: July 10, 2018Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kiichiro Takenaka, Masahiro Ito, Masakazu Hori, Mitsuo Ariie, Hayato Nakamura, Satoshi Arayashiki, Hidetoshi Matsumoto, Tsuyoshi Sato, Satoshi Tanaka
-
Publication number: 20180062578Abstract: The power amplifier circuit includes a first amplifier that amplifies a first signal and outputs a second signal, a second amplifier that amplifies the second signal and outputs a third signal, a power supply terminal that receives supply of a power supply voltage that varies as a function of an amplitude of the first signal, a first power supply line that supplies the power supply voltage from the power supply terminal to the first amplifier, a second power supply line that supplies the power supply voltage from the power supply terminal to the second amplifier, and a first delay circuit provided in the second power supply line.Type: ApplicationFiled: August 11, 2017Publication date: March 1, 2018Inventors: Tsuyoshi Sato, Hidetoshi Matsumoto
-
Publication number: 20170309266Abstract: A sound absorbing body comprises a non-woven fabric or a non-woven fabric laminate, the non-woven fabric or the non-woven fabric laminate comprises a fiber that has an average fiber diameter of less than 3,000 nm, the non-woven fabric or the non-woven fabric laminate has a thickness of less than 10 mm, the non-woven fabric or the non-woven fabric laminate has a unit thickness flow resistance of greater than 4.0 E+06 Ns/m4 and less than 5.0 E+08 Ns/m4, and the non-woven fabric or the non-woven fabric laminate has a bulk density of greater than 70 kg/m3 and less than 750 kg/m3.Type: ApplicationFiled: September 30, 2015Publication date: October 26, 2017Applicant: Michelin Recherche et Technique S.A.Inventors: SHUICHI AKASAKA, HIDETOSHI MATSUMOTO, TAKAHISA KATO
-
Publication number: 20170310281Abstract: A power amplifier module includes an amplifier transistor and a bias circuit. A first power supply voltage based on a first operation mode or a second power supply voltage based on a second operation mode is supplied to the amplifier transistor. The amplifier transistor receives a first signal and outputs a second signal obtained by amplifying the first signal. The bias circuit supplies a bias current to the amplifier transistor. The bias circuit includes first and second resistors and first and second transistors. The first transistor is connected in series with the first resistor and is turned ON by a first bias control voltage which is supplied when the first operation mode is used. The second transistor is connected in series with the second resistor and is turned ON by a second bias control voltage which is supplied when the second operation mode is used.Type: ApplicationFiled: July 11, 2017Publication date: October 26, 2017Inventors: Masao Kondo, Hidetoshi Matsumoto
-
Patent number: 9735739Abstract: A power amplifier module includes an amplifier transistor and a bias circuit. A first power supply voltage based on a first operation mode or a second power supply voltage based on a second operation mode is supplied to the amplifier transistor. The amplifier transistor receives a first signal and outputs a second signal obtained by amplifying the first signal. The bias circuit supplies a bias current to the amplifier transistor. The bias circuit includes first and second resistors and first and second transistors. The first transistor is connected in series with the first resistor and is turned ON by a first bias control voltage which is supplied when the first operation mode is used. The second transistor is connected in series with the second resistor and is turned ON by a second bias control voltage which is supplied when the second operation mode is used.Type: GrantFiled: December 15, 2016Date of Patent: August 15, 2017Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Masao Kondo, Hidetoshi Matsumoto
-
Patent number: 9717144Abstract: There are provided a conductive nanowire network, a conductive board and transparent electrode utilizing it, and a method for producing the same. The conductive nanowire network of the invention has essentially unbroken, continuous conductive nanowires randomly formed into a network. In the method for producing a conductive nanowire network according to the invention, nanofibers are applied in a random network-like fashion onto a substrate covered with a conductive layer, the conductive layer regions that are not covered with the nanofibers are removed, and then the nanofibers are removed. The network structure (wire diameter and network density) are also controlled to obtain a transparent electrode exhibiting both transparency and conductivity.Type: GrantFiled: February 19, 2014Date of Patent: July 25, 2017Assignees: Tokyo Institute of Technology, JX Nippon Oil & Energy CorporationInventors: Koichi Sakajiri, Keisuke Azuma, Hidetoshi Matsumoto, Junji Watanabe, Masatoshi Tokita
-
Patent number: 9705451Abstract: An envelope tracking system is employed in a power amplification module that supports multiple frequency bands. The power amplification module includes multiple power amplification circuits, each of which includes: a first transformer to which a radio frequency signal is input; a differential amplification circuit, in which a first radio frequency signal output from transformer is input to a control electrode and in which a second radio frequency signal output from the transformer is input to a control electrode, the differential amplification circuit outputting an amplified signal obtained by amplifying a difference between the first and second radio frequency signals; and a second transformer for supplying, to the first differential amplification circuit, power-supply voltage varying according to the amplitude of the radio frequency signal and to which the first amplified signal is input.Type: GrantFiled: November 4, 2015Date of Patent: July 11, 2017Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kiichiro Takenaka, Tsuyoshi Sato, Masahiro Ito, Hidetoshi Matsumoto, Satoshi Tanaka