Patents by Inventor Akihiko Akasegawa
Akihiko Akasegawa 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: 7587229Abstract: A superconducting tunable filter comprises a dielectric base plate; a patch-shaped resonator pattern formed of a superconducting material on the dielectric base plate; a top dielectric locally placed on the superconducting resonator pattern at a prescribed position and made of a material with an electric-field dependent permittivity; a conducting pattern formed on a top face of the top dielectric; and a bias voltage supply configured to apply a bias voltage between the conducting pattern and the superconducting resonator pattern.Type: GrantFiled: March 27, 2007Date of Patent: September 8, 2009Assignee: Fujitsu LimitedInventors: Masatoshi Ishii, Kazunori Yamanaka, Akihiko Akasegawa, John David Baniecki, Kazuaki Kurihara, Teru Nakanishi
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Patent number: 7567145Abstract: A superconducting tunable filter is disclosed that has a center frequency and a bandwidth able to be adjusted separately. The superconducting tunable filter includes a superconducting resonator filter pattern formed on a dielectric substrate; a dielectric or magnetic plate above the resonator filter pattern and having a through-hole; a dielectric or magnetic rod inserted in the through-hole; and a position controller which separately controls the position of the dielectric or magnetic plate and the position of the dielectric or magnetic rod relative to the resonator filter pattern.Type: GrantFiled: November 30, 2006Date of Patent: July 28, 2009Assignee: Fujitsu LimitedInventors: Akihiko Akasegawa, Kazuaki Kurihara, Kazunori Yamanaka, Shigetoshi Ohshima, Atsushi Saito
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Patent number: 7565188Abstract: A superconducting filter device is disclosed that is able to prevent current concentration and improve electrical surface resistance. The superconducting filter device includes a first dielectric substrate, and a bulk superconducting resonator that is embedded in the first dielectric substrate and is formed from a bulk superconducting material.Type: GrantFiled: December 11, 2006Date of Patent: July 21, 2009Assignee: Fujitsu LimitedInventors: Akihiko Akasegawa, Kazuaki Kurihara, Kazunori Yamanaka, Shigetoshi Ohshima, Atsushi Saito
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Patent number: 7558608Abstract: A superconducting device comprises a dielectric substrate, and a plane-figure type resonator pattern made of a superconductive material and formed on a first face of the dielectric substrate. The resonator pattern has a notch at least a portion of which is round.Type: GrantFiled: September 23, 2005Date of Patent: July 7, 2009Assignee: Fujitsu LimitedInventors: Akihiko Akasegawa, Manabu Kai, Teru Nakanishi, Kazunori Yamanaka
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Publication number: 20090167460Abstract: A superconducting tunable filter is disclosed that has a center frequency and a bandwidth able to be adjusted separately. The superconducting tunable filter includes a superconducting resonator filter pattern formed on a dielectric substrate; a dielectric or magnetic plate above the resonator filter pattern and having a through-hole; a dielectric or magnetic rod inserted in the through-hole; and a position controller which separately controls the position of the dielectric or magnetic plate and the position of the dielectric or magnetic rod relative to the resonator filter pattern.Type: ApplicationFiled: November 30, 2006Publication date: July 2, 2009Applicant: FUJITSU LIMITEDInventors: Akihiko Akasegawa, Kazuaki Kurihara, Kazunori Yamanaka, Shigetoshi Ohshima, Atsushi Saito
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Publication number: 20080297284Abstract: A dual-mode filter capable of providing a high degree of design freedom and/or tunability is disclosed. The dual-mode filter includes a ring resonator; an input feeder and an output feeder disposed substantially orthogonal with respect to each other and with respect to the ring resonator so as to be electromagnetically coupled to the ring resonator; and a dual-mode generating line disposed inside the ring resonator in a manner so that the dual-mode generating line does not overlap with a line extending from the input feeder or a line extending from the output feeder.Type: ApplicationFiled: May 8, 2008Publication date: December 4, 2008Applicant: FUJITSU LIMITEDInventors: Masatoshi ISHII, Kazunori YAMANAKA, John D. BANIECKI, Akihiko AKASEGAWA, Teru NAKANISHI
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Publication number: 20080274899Abstract: A superconducting disk resonator is disclosed that includes a dielectric base substrate having dielectric anisotropy, a disk type superconducting resonator pattern that is formed on the dielectric base substrate with superconducting material, and a pair of signal input/output lines arranged on the dielectric base substrate and extending in a straight line towards the disk type superconducting resonator pattern. The direction of dielectric anisotropy of the dielectric base substrate is oriented at ±90 degrees with respect to an extending direction of the pair of signal input/output lines.Type: ApplicationFiled: February 28, 2008Publication date: November 6, 2008Applicant: FUJITSU LIMITEDInventors: Akihiko AKASEGAWA, Teru NAKANISHI, Keisuke SATO
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Publication number: 20080269062Abstract: A bandpass filter capable of creating a dual mode with a simple configuration and stably adjusting the filter characteristics of the bandpass filter is disclosed. The bandpass filter includes a dielectric base substrate; a disk resonator formed over the dielectric base substrate; and a dielectric block disposed over a part of the dielectric base substrate and in substantially the same plane as the disk resonator.Type: ApplicationFiled: April 21, 2008Publication date: October 30, 2008Applicant: FUJITSU LIMITEDInventors: Masatoshi ISHII, Kazunori YAMANAKA, John D. BANIECKI, Akihiko AKASEGAWA
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Publication number: 20080266033Abstract: A resonance pattern (21) made of conductive material and having a circular plan shape is formed over the principal surface of a dielectric substrate. First and second virtual straight lines mutually crossing at a right angle are defined. A first input port (22) and a first output port (23) are electromagnetically coupled to the resonance pattern at two cross points between the first virtual straight line and an outer circumference line of the resonance pattern. A second input port (24) and a second output port (25) are electromagnetically coupled to the resonance pattern at two cross points between the second virtual straight line and the outer circumference line of the resonance pattern. A first inter-port waveguide (26) propagates a high frequency signal output to the first output port to the second input port.Type: ApplicationFiled: April 24, 2008Publication date: October 30, 2008Applicant: FUJITSU LIMITEDInventors: Masatoshi ISHII, Kazunori YAMANAKA, John D. BANIECKI, Akihiko AKASEGAWA, Teru NAKANISHI
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Publication number: 20080242550Abstract: The tunable filter includes two or more adjacent resonators, and a variable capacitive coupler formed on the same substrate where the resonators are formed provided between the resonators. The tunable filter is appropriate for integration which can efficiently change a coupling capacitance between the resonators using a simple structure.Type: ApplicationFiled: March 25, 2008Publication date: October 2, 2008Applicant: FUJITSU LIMITEDInventors: Masatoshi ISHII, Kazunori YAMANAKA, John David BANIECKI, Akihiko AKASEGAWA
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Publication number: 20080242549Abstract: A superconducting filter device is disclosed that includes a dielectric base substrate; a patch-type resonator pattern formed of a superconducting material on the base substrate; and a feeder extending in the vicinity of the resonator pattern. The feeder includes a transmission line part for signal inputting or signal outputting, the transmission line part extending toward the resonator pattern; a facing part bent from the transmission line part to face the resonator pattern; and an end part bent from the facing part in a direction away from the resonator pattern.Type: ApplicationFiled: March 24, 2008Publication date: October 2, 2008Applicant: FUJITSU LIMITEDInventors: Kazunori YAMANAKA, Akihiko AKASEGAWA, Kazuaki KURIHARA
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Publication number: 20080167190Abstract: A superconductive device that includes a ground film made of the superconductive material, wherein part of the ground film has an opening pattern.Type: ApplicationFiled: January 10, 2008Publication date: July 10, 2008Applicant: FUJITSU LIMITEDInventor: Akihiko AKASEGAWA
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Publication number: 20080146450Abstract: In a wall of a package base made of aluminum or aluminum alloy, there is formed a through-hole, through which a semi-rigid coaxial cable passes. A central conductor of the semi-rigid coaxial cable is joined to an electrode with a solder material. The semi-rigid coaxial cable has an insulating material through which the central conductor passes and an outer conductor provided therearound. The central conductor and outer conductor are made of stainless steel, for example, and the insulating material is made of fluororesin, for example. Inside the through-hole, the wall of the package base and the outer conductor are electrically connected to each other via a stainless material within the hole formed in a cylindrical fluororesin material. The semi-rigid coaxial cable and the like are fixed to the wall with a conductive screw.Type: ApplicationFiled: October 26, 2007Publication date: June 19, 2008Applicant: FUJITSU LIMITEDInventors: Teru Nakanishi, Akihiko Akasegawa, Kazunori Yamanaka, Kazuaki Kurihara
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Publication number: 20080061908Abstract: The coaxial connector 10 to be connected with a coaxial cable has a surface covering layer 20 formed of a metal material which causes an eutectic reaction with In on the surface of a terminal 12 which is a core conductor. Because of the surface covering layer 20 of a metal material which causes the eutectic reaction with In formed on the surface of the terminal of the coaxial connector, the terminal of the coaxial connector and the electrode of a superconductor device can be jointed to each other by the solder layer of In-based solder at a relatively low temperature. Thus, the discharge of oxygen from the inside of the superconductor film of a superconductor filter can be suppressed, and the decrease of the critical temperature TC can be suppressed.Type: ApplicationFiled: September 11, 2007Publication date: March 13, 2008Applicant: FUJITSU LIMITEDInventors: Teru Nakanishi, Akihiko Akasegawa, Kazunori Yamanaka, Kazuaki Kurihara
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Publication number: 20080018421Abstract: A superconducting filter device is disclosed that is able to prevent current concentration and improve electrical surface resistance. The superconducting filter device includes a first dielectric substrate, and a bulk superconducting resonator that is embedded in the first dielectric substrate and is formed from a bulk superconducting material.Type: ApplicationFiled: December 11, 2006Publication date: January 24, 2008Applicant: FUJITSU LIMITEDInventors: Akihiko Akasegawa, Kazuaki Kurihara, Kazunori Yamanaka, Shigetoshi Ohshima, Atsushi Saito
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Patent number: 7283855Abstract: A dielectric waveguide which comprises a first single crystal magnesium oxide block having a surface of face (001), (100) or (010) and a first copper oxide superconducting film formed on the above-described surface in a c-axis crystal orientation perpendicular to the surface, and a method of production thereof are provided.Type: GrantFiled: August 26, 2003Date of Patent: October 16, 2007Assignee: Fujitsu LimitedInventors: Kazunori Yamanaka, Akihiko Akasegawa, Masafumi Shigaki, Isao Nakazawa
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Publication number: 20070229183Abstract: A superconducting device comprises a dielectric substrate, and a plane-figure type resonator pattern made of a superconductive material and formed on a first face of the dielectric substrate. The resonator pattern has a notch at least a portion of which is round.Type: ApplicationFiled: September 23, 2005Publication date: October 4, 2007Applicant: FUJITSU LIMITEDInventors: Akihiko Akasegawa, Manabu Kai, Teru Nakanishi, Kazunori Yamanaka
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Publication number: 20070232499Abstract: A superconducting tunable filter comprises a dielectric base plate; a patch-shaped resonator pattern formed of a superconducting material on the dielectric base plate; a top dielectric locally placed on the superconducting resonator pattern at a prescribed position and made of a material with an electric-field dependent permittivity; a conducting pattern formed on a top face of the top dielectric; and a bias voltage supply configured to apply a bias voltage between the conducting pattern and the superconducting resonator pattern.Type: ApplicationFiled: March 27, 2007Publication date: October 4, 2007Applicant: FUJITSU LIMITEDInventors: Masatoshi Ishii, Kazunori Yamanaka, Akihiko Akasegawa, John Baniecki, Kazuaki Kurihara, Teru Nakanishi
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Publication number: 20070210874Abstract: A resonator pattern made of superconductive material is disposed over a first surface of a base substrate made of dielectric. An adjustment substrate made of dielectric is disposed facing the first surface at a distance from the first surface. The adjustment substrate is supported by a support mechanism for supporting the adjustment substrate in such a manner capable of changing an angle between the first surface and a surface of the adjustment substrate facing the base substrate. A superconductive filter is provided which can shift a center frequency of a filter band and suppress disturbance of a waveform of a filter characteristic, with a simple method.Type: ApplicationFiled: November 9, 2006Publication date: September 13, 2007Applicant: FUJITSU LIMITEDInventors: Tsuyoshi Aoki, Kazuaki Kurihara, Teru Nakanishi, Akihiko Akasegawa, Manabu Kai, Kazunori Yamanaka
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Patent number: 7263392Abstract: A transmission line is provided which has a low loss and can flow large current. A superconductor transmission line has: an internal conductor; and an external conductor surrounding the internal conductor, made of oxide superconductor and having four planes, which four planes have a cross section of a hollow quadrilateral with each corner portion being removed, and adjacent planes of which define a slit narrower than ?/4 (? being a wavelength of a high frequency wave to be transmitted).Type: GrantFiled: August 16, 2005Date of Patent: August 28, 2007Assignee: Fujitsu LimitedInventors: Akihiko Akasegawa, Kazunori Yamanaka, Teru Nakanishi