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).
-
Patent number: 7221238Abstract: A compact superconducting filter device can easily change a bandwidth and a center frequency without changing a pattern or shape of the filter. A filter pattern is formed on a substrate made of a dielectric material. The filter pattern is made of a superconductor material. A signal input line and a signal output line are formed on the substrate so as to extend from a periphery of the filter pattern. An adjust plate is located above the filter pattern with a predetermined distance therebetween. The adjust plate is formed of one of an electrically conductive material, a superconductive material and a dielectric material.Type: GrantFiled: January 27, 2005Date of Patent: May 22, 2007Assignee: Fujitsu LimitedInventors: Teru Nakanishi, Akihiko Akasegawa, Manabu Kai, Kazunori Yamanaka
-
Patent number: 7218184Abstract: A superconducting filter including input/output feeders formed on one surface of a dielectric substrate, resonator patterns formed on one surface of the dielectric substrate, and a dielectric plate mounted on the one surface of the dielectric substrate with a plurality of spacers formed on said one surface of the dielectric substrate disposed therebetween. The dielectric plate covers the region including the resonator patterns, and the input/output feeders length-wise over the length within ±20% of positive integer times a ¼ effective wavelength from the sides nearer to the resonator patterns.Type: GrantFiled: September 27, 2004Date of Patent: May 15, 2007Assignee: Fujitsu LimitedInventors: Kazunori Yamanaka, Teru Nakanishi, Manabu Kai, Akihiko Akasegawa
-
Patent number: 6980841Abstract: A resonator is formed by forming a microstrip line having an electrical length corresponding to a ?/2 wavelength on a dielectric substrate, forming both side portions of the microstrip line from the center thereof into spiral shapes, making the orientations of the spirals opposite each other, making outer-side portions of the spiral shapes on both sides, inclusive of the central portion of the microstrip line, linear in shape overall, and making linear in shape a portion of prescribed range from the end portion of each spiral shape.Type: GrantFiled: August 12, 2004Date of Patent: December 27, 2005Assignee: Fujitsu LimitedInventors: Manabu Kai, Kazunori Yamanaka, Teru Nakanishi, Akihiko Akasegawa
-
Publication number: 20050272609Abstract: 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: ApplicationFiled: August 16, 2005Publication date: December 8, 2005Applicant: FUJITSU LIMITEDInventors: Akihiko Akasegawa, Kazunori Yamanaka, Teru Nakanishi
-
Publication number: 20050261135Abstract: The superconducting filter comprises input/output feeders 14a, 14b formed on one surface of a dielectric substrate 10, resonator patterns 16a-16e formed on said one surface of the dielectric substrate 10, and a dielectric plate 24 mounted on said one surface of the dielectric plate 24 with a plurality of spacers 20, 22 formed on said one surface of the dielectric substrate 10. The dielectric plate 24 covers the region including the resonator patterns 16a-16e, and the input/output feeders 14a, 14b length-wise over the length within ±20% of positive integer times a ¼ effective wavelength from the sides nearer to the resonator patterns.Type: ApplicationFiled: September 27, 2004Publication date: November 24, 2005Applicant: FUJITSU LIMITEDInventors: Kazunori Yamanaka, Teru Nakanishi, Manabu Kai, Akihiko Akasegawa
-
Publication number: 20050256010Abstract: A compact superconducting filter device can easily change a bandwidth and a center frequency without changing a pattern or shape of the filter. A filter pattern is formed on a substrate made of a dielectric material. The filter pattern is made of a superconductor material. A signal input line and a signal output line are formed on the substrate so as to extend from a periphery of the filter pattern. An adjust plate is located above the filter pattern with a predetermined distance therebetween. The adjust plate is formed of one of an electrically conductive material, a superconductive material and a dielectric material.Type: ApplicationFiled: January 27, 2005Publication date: November 17, 2005Applicant: FUJITSU LIMITEDInventors: Teru Nakanishi, Akihiko Akasegawa, Manabu Kai, Kazunori Yamanaka
-
Publication number: 20050256008Abstract: A compact superconducting filter device can easily change a bandwidth and a center frequency without changing a pattern or shape of the filter. A filter pattern is formed on a substrate made of a dielectric material. The filter pattern is made of a superconductor material. A signal input line and a signal output line are formed on the substrate so as to extend from a periphery of the filter pattern. An adjust plate is located above the filter pattern with a predetermined distance therebetween. The adjust plate is made of an electrically conductive material.Type: ApplicationFiled: September 23, 2004Publication date: November 17, 2005Applicant: FUJITSU LIMITEDInventors: Teru Nakanishi, Akihiko Akasegawa, Manabu Kai, Kazunori Yamanaka
-
Patent number: 6889068Abstract: A superconducting signal transmission apparatus provided with a vacuum container 11, a superconducting electronic device 12 provided in the vacuum container 11, an input side transmission line 13 and output side transmission line 14 for connection to the superconducting electronic device 12 through the vacuum container 11, and a cooling mechanism (15, 16, 17) for cooling the superconducting electronic device 12 and further having a heat cutoff signal transmission unit 20 inserted at least at part of the input side and output side transmission lines 13 and 14. The heat cutoff signal transmission unit 20 is comprised of a substrate 31 and a flat circuit body 30 provided with a signal transmission line 32 and ground layer (33, 33-1, 33-2). The substrate 31 is comprised of a dielectric material having a small heat conductivity. The conductor portions forming the signal transmission line 32 and the ground layer are formed with thin thicknesses enabling suppression of the inflow of heat from the outside.Type: GrantFiled: July 29, 2002Date of Patent: May 3, 2005Assignee: Fujitsu LimitedInventors: Manabu Kai, Toru Maniwa, Kazunori Yamanaka, Akihiko Akasegawa
-
Publication number: 20050020452Abstract: A coaxial connector 10 to be connected to a coaxial cable comprising a surface coating layer 20 of indium or an indium alloy being formed on the surface of a terminal 12 which is a central conductor. Since indium similar to an indium-based solder material is used as the material of the surface coating layer 20, a reaction product is prevented from being produced in indium-based solder by the reaction between the material of the surface coating layer 20 and the material of the indium-based solder material. Accordingly, deterioration of the flexibility of the indium-based solder can be prevented, and a superconducting device which can endure the repeated temperature changes between the room temperature and lower temperatures can be provided.Type: ApplicationFiled: August 19, 2004Publication date: January 27, 2005Applicant: Fujitsu LimitedInventors: Teru Nakanishi, Akihiko Akasegawa, Kazunori Yamanaka
-
Publication number: 20050009709Abstract: A resonator is formed by forming a microstrip line having an electrical length corresponding to a ?/2 wavelength on a dielectric substrate, forming both side portions of the microstrip line from the center thereof into spiral shapes, making the orientations of the spirals' opposite each other, making outer-side portions of the spiral shapes on both sides, inclusive of the central portion of the microstrip line, linear in shape overall, and making linear in shape a portion of prescribed range from the end portion of each spiral shape.Type: ApplicationFiled: August 12, 2004Publication date: January 13, 2005Inventors: Manabu Kai, Kazunori Yamanaka, Teru Nakanishi, Akihiko Akasegawa
-
Patent number: 6823201Abstract: A superconducting microstrip filter capable of achieving an improvement of power resistance without enlarging the overall size and while maintaining steep cut characteristics. This filter has a resonator section including at least one resonator. This resonator forms a current density reduction part in one part of its line pattern. Also, the filter has an input line section arranged adjoining the resonator of an initial stage. Current density reduction parts are formed in one part of this input line section. Alternatively, the input line section is comprised of a normal conductor.Type: GrantFiled: July 26, 2002Date of Patent: November 23, 2004Assignee: Fujitsu LimitedInventors: Manabu Kai, Toru Maniwa, Kazunori Yamanaka, Akihiko Akasegawa
-
Publication number: 20040041656Abstract: 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: ApplicationFiled: August 26, 2003Publication date: March 4, 2004Applicant: FUJITSU LIMITEDInventors: Kazunori Yamanaka, Akihiko Akasegawa, Masafumi Shigaki, Isao Nakazawa
-
Patent number: 6690957Abstract: A high temperature superconductor film which is Y—Ba—Cu—O-based and formed on a dielectric substrate 10, and has a Cu composition ratio to the Ba near the upper surface of the film which is higher than a Cu composition ratio to the Ba inside the film. The YBCO-based high temperature superconductor film is formed with a Cu composition on the film surface maintained higher with respect to the stoichiometric composition, whereby the Cu oxide can be easily produced while the production of the yttrium oxides can be depressed. The yttrium oxides cannot be easily produced, which makes it difficult for pores and crystal strains to be generated while the Cu oxide functions as a flux for advancing the crystal growth, whereby the YBCO-based high temperature superconductor film can have good film quality and single crystal. The superconducting elements can be formed of the YBCO-based high temperature superconducting film of such good film quality.Type: GrantFiled: March 20, 2002Date of Patent: February 10, 2004Assignee: Fujitsu LimitedInventors: Akihiko Akasegawa, Kazunori Yamanaka, Teru Nakanishi
-
Publication number: 20030073584Abstract: A high temperature superconductor film which is Y—Ba—Cu—O-based and formed on a dielectric substrate 10, and has a Cu composition ratio to the Ba near the upper surface of the film which is higher than a Cu composition ratio to the Ba inside the film. The YBCO-based high temperature superconductor film is formed with a Cu composition on the film surface maintained higher with respect to the stoichiometric composition, whereby the Cu oxide can be easily produced while the production of the yttrium oxides can be depressed. The yttrium oxides cannot be easily produced, which makes it difficult for pores and crystal strains to be generated while the Cu oxide functions as a flux for advancing the crystal growth, whereby the YBCO-based high temperature superconductor film can have good film quality and single crystal. The superconducting elements can be formed of the YBCO-based high temperature superconducting film of such good film quality.Type: ApplicationFiled: March 20, 2002Publication date: April 17, 2003Applicant: Fujitsu LimitedInventors: Akihiko Akasegawa, Kazunori Yamanaka, Teru Nakanishi
-
Publication number: 20030016094Abstract: A superconducting microstrip filter capable of achieving an improvement of power resistance without enlarging the overall size and while maintaining steep cut characteristics. This filter has a resonator section including at least one resonator. This resonator forms a current density reduction part in one part of its line pattern. Also, the filter has an input line section arranged adjoining the resonator of an initial stage. Current density reduction parts are formed in one part of this input line section. Alternatively, the input line section is comprised of a normal conductor.Type: ApplicationFiled: July 26, 2002Publication date: January 23, 2003Inventors: Manabu Kai, Toru Maniwa, Kazunori Yamanaka, Akihiko Akasegawa
-
Publication number: 20020187902Abstract: A superconducting signal transmission apparatus provided with a vacuum container 11, a superconducting electronic device 12 provided in the vacuum container 11, an input side transmission line 13 and output side transmission line 14 for connection to the superconducting electronic device 12 through the vacuum container 11, and a cooling mechanism (15, 16, 17) for cooling the superconducting electronic device 12 and further having a heat cutoff signal transmission unit 20 inserted at least at part of the input side and output side transmission lines 13 and 14. The heat cutoff signal transmission unit 20 is comprised of a substrate 31 and a flat circuit body 30 provided with a signal transmission line 32 and ground layer (33, 33-1, 33-2). The substrate 31 is comprised of a dielectric material having a small heat conductivity. The conductor portions forming the signal transmission line 32 and the ground layer are formed with thin thicknesses enabling suppression of the inflow of heat from the outside.Type: ApplicationFiled: July 29, 2002Publication date: December 12, 2002Inventors: Manabu Kai, Toru Maniwa, Kazunori Yamanaka, Akihiko Akasegawa
-
Patent number: 6367266Abstract: A heat insulation chamber according to the present invention is a heat insulation chamber which is made of heat insulating material and forms an inner chamber for accommodating an electronic part. This heat insulation chamber achieves coupling between the electronic part accommodated in the inner chamber formed within a cabinet and the outside of the cabinet by a radio transmission path or a coupling path by static coupling or inductive coupling. A thermostatic chamber and a cryostat according to the present invention comprise the aforementioned heat insulation chamber, a heat exchanger mounted in the heat insulation chamber, and a thermoregulator which maintains the temperature of the inner chamber accommodating the electronic part at an operating temperature of the electronic part through the heat exchanger.Type: GrantFiled: July 28, 1999Date of Patent: April 9, 2002Assignee: Fujitsu LimitedInventors: Kazuhiko Kobayashi, Kazunori Yamanaka, Akihiko Akasegawa, Yoshiharu Tozawa, Fumihiko Kobayashi, Ichiro Abeno