Patents by Inventor Nagahisa Furutani
Nagahisa Furutani 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: 8537052Abstract: An antenna includes a dielectric substrate, a ground electrode provided on a first surface of the dielectric substrate, a first antenna element and a second antenna elements provided to a second surface of the dielectric substrate, the first and second antenna elements having an identical resonance frequency and an identical Q value, a transmission line connecting the first and second antenna elements, and a feed part provided in the transmission line.Type: GrantFiled: January 29, 2010Date of Patent: September 17, 2013Assignees: Fujitsu Limited, Fujitsu Frontech LimitedInventors: Nagahisa Furutani, Manabu Kai, Satoru Nogami
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Patent number: 8188931Abstract: An electronic device includes an antenna and a semiconductor element. The antenna includes a first conductor section that includes a first feeding point and spreads flatly, and a second conductor section that includes a second feeding point and spreads flatly while facing the first conductor section, the first conductor section and the second conductor section being disposed so as to be symmetric with respect to a plane, including a position of the first feeding point and a position of the second feeding point. The semiconductor element supplies the first feeding point and the second feeding point with signals opposite to each other in polarity, respectively, thereby communicating via the antenna.Type: GrantFiled: June 16, 2010Date of Patent: May 29, 2012Assignee: Fujitsu LimitedInventor: Nagahisa Furutani
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Publication number: 20110240744Abstract: An antenna substrate is provided with a conductor layer, a soft magnetic layer, a patch layer, and a dielectric layer. The soft magnetic layer is disposed on the conductor layer. The patch layer includes a plurality of electromagnetic band gap electrodes which are two-dimensionally arranged on the soft magnetic layer. The dielectric layer is disposed on the patch layer.Type: ApplicationFiled: March 28, 2011Publication date: October 6, 2011Applicant: FUJITSU LIMITEDInventor: Nagahisa FURUTANI
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Publication number: 20100253583Abstract: An electronic device includes an antenna and a semiconductor element. The antenna includes a first conductor section that includes a first feeding point and spreads flatly, and a second conductor section that includes a second feeding point and spreads flatly while facing the first conductor section, the first conductor section and the second conductor section being disposed so as to be symmetric with respect to a plane, including a position of the first feeding point and a position of the second feeding point. The semiconductor element supplies the first feeding point and the second feeding point with signals opposite to each other in polarity, respectively, thereby communicating via the antenna.Type: ApplicationFiled: June 16, 2010Publication date: October 7, 2010Applicant: FUJITSU LIMITEDInventor: Nagahisa Furutani
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Publication number: 20100214188Abstract: An antenna includes a dielectric substrate, a ground electrode provided on a first surface of the dielectric substrate, a first antenna element and a second antenna elements provided to a second surface of the dielectric substrate, the first and second antenna elements having an identical resonance frequency and an identical Q value, a transmission line connecting the first and second antenna elements, and a feed part provided in the transmission line.Type: ApplicationFiled: January 29, 2010Publication date: August 26, 2010Applicants: FUJITSU LIMITED, FUJITSU FRONTECH LIMITEDInventors: Nagahisa Furutani, Manabu Kai, Satoru Nogami
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Publication number: 20080012714Abstract: A radio frequency identification tag includes an antenna element embedded in a thin plate made of a resin material. A radio wave reflector made of metal is embedded in the thin plate. The radio wave reflector extends in parallel with the antenna element. The radio wave reflector serves to reflect radio wave penetrating into the thin plate. The reflected radio wave is directed to the antenna element. The radio wave reflector serves to increase the received amount of the radio wave at the antenna element. The radio frequency identification tag thus significantly contributes to increase of a communication range. Moreover, since the radio wave reflector is embedded in the thin plate, the radio frequency identification tag can be utilized in conventional applications or purposes as ever. The addition of a reflector outside the tag inevitably restrains the applications of the tag.Type: ApplicationFiled: September 14, 2007Publication date: January 17, 2008Applicant: FUJITSU LIMITEDInventor: Nagahisa Furutani
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Publication number: 20070252706Abstract: The present invention relates to an IC tag housing case configured to house an IC tag therein, and the objective thereof is to accurately exchange information between an IC tag and a reader/writer without increasing costs for an IC tag. To this end, an IC tag housing case is configured to include a lid body formed of a material that allows electromagnetic waves to pass therethrough, and a case body having a space portion where an IC tag is housed and formed of a high magnetic permeability material.Type: ApplicationFiled: June 29, 2007Publication date: November 1, 2007Applicant: FUJITSU LIMITEDInventor: Nagahisa Furutani
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Patent number: 5708397Abstract: A high-frequency circuit device includes a varactor diode having a first terminal and a second terminal, a first strip line connected to the first terminal of the varactor diode, a voltage being applied to the varactor diode via the first terminal, a second strip line having a first end connected to the second terminal of the varactor diode, and a second open end. The second strip line has a length so as to obtain an equivalent strip line length taking into capacitances of the varactor diode and the second strip line. The equivalent strip line length determines a characteristic of the high-frequency circuit device.Type: GrantFiled: June 26, 1996Date of Patent: January 13, 1998Assignees: Fujitsu Limited, Fujitsu Quantum Devices LimiedInventors: Nagahisa Furutani, Tsuneyuki Tanaka
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Patent number: 5561592Abstract: In a hybrid integrated circuit module in which circuit components, including semiconductor devices and chip components, are integrated and which is bonded onto a heat-sinking substrate, a substrate for mounting chip components is made of a low thermal conductivity material and is bonded onto the heat-sinking substrate; a base plate for mounting semiconductor devices is made of a high thermal conductivity material and is bonded onto the heat-sinking substrate; a hollow cover covers a space above the base plate to make an enclosure between the base plate and the cover; a sealing means hermetically seals the enclosure; and a plurality of interconnection leads is formed through the cover to electrically connect a circuit on the base plate and a circuit on the substrate and for testing operating signals in the semiconductor devices.Type: GrantFiled: December 14, 1994Date of Patent: October 1, 1996Assignee: Fujitsu LimitedInventors: Nagahisa Furutani, Nobutoshi Fukuden
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Patent number: 5229732Abstract: A selection unit, which is provided between an input matching unit and a high frequency amplification unit, is used to select a specific high frequency band to be amplified by the high frequency amplification unit from high frequency signals input from an input terminal. Further, an attenuation unit, which is provided between an input of the high frequency amplification unit and ground, is used to attenuate the input high frequency signals except for the specific high frequency band. Therefore, the specific high frequency band of the input high frequency signals is transferred from the input terminal to the high frequency amplification unit through the selection unit with a small loss, and the input high frequency signals except for the specific high frequency band are attenuated by the attenuation unit.Type: GrantFiled: May 4, 1992Date of Patent: July 20, 1993Assignee: Fujitsu LimitedInventors: Nagahisa Furutani, Kazuhiro Matsumoto, Yutaka Hirano
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Patent number: 5159287Abstract: A high efficiency RF power amplifier includes a field effect transistor having a grounded source, a gate receiving an input signal, and a drain. A first inductor has a first end coupled to the drain via a lead inductance, and a second end through which an amplified output signal is output. A first capacitor has a first end grounded and a second end coupled to the second end of the first inductor. A second inductor has a first end receiving a drain bias voltage and a second end coupled to the second end of the first inductor. The second inductor is formed of a distributed-constant element. The first capacitor and the second inductor form a parallel resonant circuit coupled to the drain at a fundamental operating frequency of the high efficiency RF power amplifier, so that the drain is set to a high-impedance state.Type: GrantFiled: July 16, 1991Date of Patent: October 27, 1992Assignees: Fujitsu Limited, Fujitsu Yamanashi Electronics LimitedInventors: Nagahisa Furutani, Kazuhiro Matsumoto, Isao Imai
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Patent number: 5128636Abstract: A diode limiter including a signal line connects an input terminal to which a high power electric pulse signal is applied and an output terminal connected to a receiver. A PIN diode conducts when the high power electric pulse signal is applied thereto and provides a low impedance connection of the signal line to ground. A directional coupler extracts a part of the high power electric pulse signal out of the signal line. A detector diode is inserted in the return direct current path of the PIN diode, a resistor is inserted into the path including the directional coupler, and a means is provided for applying the voltage generated in the resistor to the PIN diode.Type: GrantFiled: December 5, 1990Date of Patent: July 7, 1992Assignee: Fujitsu LimitedInventors: Nagahisa Furutani, Hiroshi Mugiya
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Patent number: 4107621Abstract: A microwave signal amplifier comprising transistor having input and output terminals further includes input and output matching circuits connected to the input and output terminals, respectively, and corresponding bias supply circuits connected in parallel between said transistor and said input and output matching circuits, respectively. The input and output matching circuits are each implemented by high pass filters, and the bias supply circuits are each implemented by low pass filters. Furthermore, said high pass and low pass filters respectively have capacitors and inductors connected to the transistor, and said low pass filters have termination resistors.Type: GrantFiled: June 9, 1977Date of Patent: August 15, 1978Assignee: Fujitsu LimitedInventors: Nagahisa Furutani, Kazuo Takahara, Yoshikazu Doi, Haruo Yokouchi