Patents by Inventor Yohei Ishikawa

Yohei Ishikawa 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: 6882300
    Abstract: A guide marker includes a substrate and a radio-wave reflecting unit for reflecting radio waves at certain intensity in all directions in a virtual plane, including the incident direction of the radio waves, the radio-wave reflecting unit being provided in the surface of the substrate. The radio-wave reflecting unit includes a concave and convex portions provided in the substrate or radio-wave reflectors which resonate at the frequency of incident radio waves and which reflect the radio waves in the incident direction. The radio-wave reflectors are mounted on the substrate. A visual guide marker device includes one of a light-reflecting component having a reflection characteristic and a light-generating component which self-generates light, and a guide marker including a dielectric material.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: April 19, 2005
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Fuminori Nakamura, Toru Tanizaki, Yohei Ishikawa, Taiyo Nishiyama
  • Patent number: 6861920
    Abstract: In a complex circuit board, the positional relationships between element portions, including an electrode pattern, a dielectric substrate and a magnetic substrate, can be adjusted as desired, and the complex circuit board can be miniaturized. The complex circuit board includes a dielectric substrate and a magnetic substrate, a space being provided between the magnetic substrate and the dielectric substrate, and an electrode pattern provided between the dielectric substrate and the magnetic substrate, a capacitance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the dielectric substrate, and the inductance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the magnetic substrate.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: March 1, 2005
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Hiromu Tokudera, Kei Matsutani
  • Patent number: 6828867
    Abstract: A dielectric resonator includes a slot line constructed by providing a slot electrode having a spiral slot at either an external face of a dielectric layer or inside the dielectric layer and a shielding conductor provided at a predetermined distance from the slot electrode. The slot line is employed as a resonant line so as to provide a dielectric resonator, an inductor, a capacitor, a dielectric filter, an oscillator, and/or a communication device.
    Type: Grant
    Filed: February 6, 2003
    Date of Patent: December 7, 2004
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Kenichi Iio, Hiroaki Tanaka, Yutaka Ida
  • Patent number: 6778031
    Abstract: A high-frequency circuit device includes a substrate and a high-frequency circuit. The high-frequency circuit is provided on the substrate and has a signal line. The signal line is configured with a slot line provided by electrodes that are arranged side-by-side with a space therebetween on the substrate. The slot line can facilitates circuit design compared to a microstrip line and has significantly low conduction loss compared to a coplanar line, and can improve the Q-value of the high frequency circuit. This can provide an improved high-frequency circuit device having small phase noise. The high-frequency circuit device, which also serves as an oscillator, employs a slot output and thus can provide an advantage of better continuity for a class-B push-pull amplifier that operates more efficiently than a class-A one.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: August 17, 2004
    Assignee: Murata Manufacturing Co. Ltd
    Inventors: Takahiro Baba, Koichi Sakamoto, Shigeyuki Mikami, Hiroyasu Matsuzaki, Takatoshi Kato, Yohei Ishikawa, Koichi Takizawa
  • Patent number: 6717492
    Abstract: A planar dielectric integrated circuit is provided such that energy conversion loss between a planar dielectric line and electronic components is small and that impedance matching between them can be easily obtained. A planar dielectric line is provided by causing two slots to oppose each other with a dielectric plate interposed in between, a slot line and line-conversion conductor patterns are provided in the end portions of the planar dielectric line, and an FET is disposed in such a manner as to be extended over the slot line.
    Type: Grant
    Filed: February 8, 2002
    Date of Patent: April 6, 2004
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Koichi Sakamoto, Sadao Yamashita, Kenichi Iio
  • Publication number: 20040041668
    Abstract: A high-frequency circuit device includes a dielectric substrate. A planar conductor is provided on each of top and bottom surfaces of the dielectric substrate and a slot line is formed on the top surface. Also, undesired-wave propagation preventing circuits, each including multistage band-elimination filters, are provided on the top surface of the dielectric substrate, with the slot line therebetween. Each of the band-elimination filters includes two conductive lines and a resonator which is provided at a portion of one of the conductive lines and which includes two spiral lines. Accordingly, propagation of an undesired wave of the band whose center is the resonance frequency of the resonator can be prevented.
    Type: Application
    Filed: February 26, 2003
    Publication date: March 4, 2004
    Inventors: Shigeyuki Mikami, Tetsuya Kochi, Hiroyasu Matsuzaki, Kazutaka Mukaiyama, Koichi Sakamoto, Yohei Ishikawa, Kiyoharu Kochi, Akiko Kochi
  • Publication number: 20040041646
    Abstract: In a complex circuit board, the positional relationships between element portions, including an electrode pattern, a dielectric substrate and a magnetic substrate, can be adjusted as desired, and the complex circuit board can be miniaturized. The complex circuit board includes a dielectric substrate and a magnetic substrate, a space being provided between the magnetic substrate and the dielectric substrate, and an electrode pattern provided between the dielectric substrate and the magnetic substrate, a capacitance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the dielectric substrate, and the inductance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the magnetic substrate.
    Type: Application
    Filed: August 29, 2003
    Publication date: March 4, 2004
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Hiromu Tokudera, Kei Matsutani
  • Publication number: 20040036542
    Abstract: A high-frequency circuit device includes a substrate and a high-frequency circuit. The high-frequency circuit is provided on the substrate and has a signal line. The signal line is configured with a slot line provided by electrodes that are arranged side-by-side with a space therebetween on the substrate. The slot line can facilitates circuit design compared to a microstrip line and has significantly low conduction loss compared to a coplanar line, and can improve the Q-value of the high frequency circuit. This can provide an improved high-frequency circuit device having small phase noise. The high-frequency circuit device, which also serves as an oscillator, employs a slot output and thus can provide an advantage of better continuity for a class-B push-pull amplifier that operates more efficiently than a class-A one.
    Type: Application
    Filed: March 27, 2003
    Publication date: February 26, 2004
    Inventors: Takahiro Baba, Koichi Sakamoto, Shigeyuki Mikami, Hiroyasu Matsuzaki, Takatoshi Kato, Yohei Ishikawa, Koichi Takizawa
  • Publication number: 20030214429
    Abstract: A guide marker includes a substrate and a radio-wave reflecting unit for reflecting radio waves at certain intensity in all directions in a virtual plane, including the incident direction of the radio waves, the radio-wave reflecting unit being provided in the surface of the substrate. The radio-wave reflecting unit includes a concave and convex portions provided in the substrate or radio-wave reflectors which resonate at the frequency of incident radio waves and which reflect the radio waves in the incident direction. The radio-wave reflectors are mounted on the substrate. A visual guide marker device includes one of a light-reflecting component having a reflection characteristic and a light-generating component which self-generates light, and a guide marker including a dielectric material.
    Type: Application
    Filed: March 25, 2003
    Publication date: November 20, 2003
    Inventors: Fuminori Nakamura, Toru Tanizaki, Yohei Ishikawa, Taiyo Nishiyama
  • Publication number: 20030214457
    Abstract: An antenna apparatus such that a dielectric strip and a dielectric resonator are provided for form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the direction coupler.
    Type: Application
    Filed: March 12, 2003
    Publication date: November 20, 2003
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
  • Patent number: 6646516
    Abstract: In a complex circuit board, the positional relationships between element portions, including an electrode pattern, a dielectric substrate and a magnetic substrate, can be adjusted as desired, and the complex circuit board can be miniaturized. The complex circuit board includes a dielectric substrate and a magnetic substrate, a space being provided between the magnetic substrate and the dielectric substrate, and an electrode pattern provided between the dielectric substrate and the magnetic substrate, a capacitance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the dielectric substrate, and the inductance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the magnetic substrate.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: November 11, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Hiromu Tokudera, Kei Matsutani
  • Patent number: 6628230
    Abstract: A radio frequency module includes a multi-chip substrate divided into separate substrates. An antenna block, a duplexer block, a transmitter block, a receiver block, and an oscillator block are formed on the separate substrates. Connection resonators, which are connected to transmission lines, are formed at edges of the separate substrates. The connection resonators on adjacent ones of the separate substrates are arranged close to each other such that the two adjacent resonators are electromagnetically coupled to each other. Thus, the transmission lines on the separate substrates are interconnected, and a signal can be propagated among the blocks.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: September 30, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Shigeyuki Mikami, Tetsuya Kouchi, Hiroyasu Matsuzaki, Kazutaka Mukaiyama, Koichi Sakamoto, Toshiro Hiratsuka, Takatoshi Kato, Yohei Ishikawa
  • Publication number: 20030137370
    Abstract: A dielectric resonator includes a slot line constructed by providing a slot electrode having a spiral slot at either an external face of a dielectric layer or inside the dielectric layer and a shielding conductor provided at a predetermined distance from the slot electrode. The slot line is employed as a resonant line so as to provide a dielectric resonator, an inductor, a capacitor, a dielectric filter, an oscillator, and/or a communication device.
    Type: Application
    Filed: February 6, 2003
    Publication date: July 24, 2003
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Kenichi Iio, Hiroaki Tanaka, Yutaka Ida
  • Patent number: 6563477
    Abstract: An antenna apparatus such that a dielectric strip and a dielectric resonator are provided to form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the directional coupler.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: May 13, 2003
    Assignee: Murata Manufacturing Co. Ltd.
    Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
  • Publication number: 20030085836
    Abstract: A radio frequency module includes a multi-chip substrate divided into separate substrates. An antenna block, a duplexer block, a transmitter block, a receiver block, and an oscillator block are formed on the separate substrates. Connection resonators, which are connected to transmission lines, are formed at edges of the separate substrates. The connection resonators on adjacent ones of the separate substrates are arranged close to each other such that the two adjacent resonators are electromagnetically coupled to each other. Thus, the transmission lines on the separate substrates are interconnected, and a signal can be propagated among the blocks.
    Type: Application
    Filed: September 19, 2002
    Publication date: May 8, 2003
    Inventors: Shigeyuki Mikami, Tetsuya Kouchi, Hiroyasu Matsuzaki, Kazutaka Mukaiyama, Koichi Sakamoto, Toshiro Hiratsuka, Takatoshi Kato, Yohei Ishikawa
  • Patent number: 6556107
    Abstract: A dielectric resonator includes a slot line constructed by providing a slot electrode having a spiral slot at either an external face of a dielectric layer or inside the dielectric layer and a shielding conductor provided at a predetermined distance from the slot electrode. The slot line is employed as a resonant line so as to provide a dielectric resonator, an inductor, a capacitor, a dielectric filter, an oscillator, and/or a communication device.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: April 29, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Kenichi Iio, Hiroaki Tanaka, Yutaka Ida
  • Patent number: 6515554
    Abstract: Electrodes are formed on both top and bottom surfaces of a dielectric plate and grounded coplanar lines, as transmission lines, are formed on the top surface of the dielectric plate. A plurality of micro-strip lines, each composed of high-impedance lines and low-impedance lines alternately connected in series, is arranged at a pitch shorter than the wavelength of a wave traveling along the grounded coplanar lines. A spurious mode propagation blocking circuit thus constructed prevents a spurious mode wave, such as a parallel-plate mode, from traveling.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: February 4, 2003
    Assignee: Murata Manufacturing Co. Ltd
    Inventors: Yohei Ishikawa, Kenichi Iio, Takatoshi Kato, Koichi Sakamoto
  • Patent number: 6504456
    Abstract: Electrodes are formed on the upper and under faces of a dielectric plate. For example, plural fundamental patterns having four ports and a quadrangular shape are arranged thereon. A strip conductor of a two-port circuit is determined so that adjacent two-port circuits of the respective fundamental patterns have a band-stop filter characteristic.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: January 7, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kenichi Iio, Yohei Ishikawa
  • Publication number: 20020196093
    Abstract: In a complex circuit board, the positional relationships between element portions, including an electrode pattern, a dielectric substrate and a magnetic substrate, can be adjusted as desired, and the complex circuit board can be miniaturized. The complex circuit board includes a dielectric substrate and a magnetic substrate, a space being provided between the magnetic substrate and the dielectric substrate, and an electrode pattern provided between the dielectric substrate and the magnetic substrate, a capacitance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the dielectric substrate, and the inductance element portion of the electrode pattern being provided adjacent or in contact with or spaced a predetermined distance from the magnetic substrate.
    Type: Application
    Filed: September 5, 2002
    Publication date: December 26, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Hiromu Tokudera, Kei Matsutani
  • Patent number: 6486754
    Abstract: A resonator can provide good loss characteristics by effectively suppressing power losses due to an edge effect. In addition, a filter, a duplexer, and a communication device incorporating the resonator are formed. In the resonator, a plurality of spiral lines are disposed on a surface of a dielectric substrate in such a manner that the inner and outer ends of the lines are aligned respectively along an inner periphery and an outer periphery which are centered around a central point on the substrate so that the lines do not cross each other. With this arrangement, the edge effect in the spiral lines is substantially canceled, by which power losses due to the edge effect can be effectively suppressed.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: November 26, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Seiji Hidaka, Michiaki Ota, Shin Abe, Yohei Ishikawa