Patents by Inventor Shigeyuki Mikami
Shigeyuki Mikami 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: 7518472Abstract: A transmission line having a slot line with a slot formed on a front surface electrode on a dielectric substrate, and two such slot lines are positioned with the front surface electrodes separated from one another with a gap therebetween. A slot resonator with one end open at the gap side is provided at the front edge side of each slot line, and these slot resonators are positioned so as to be capable of coupling to one another .A slot stub which is branched out from the gap side is provided on each front surface electrode. Thus, leakage of a high-frequency signal in the gap can be suppressed with the slot stub.Type: GrantFiled: July 25, 2005Date of Patent: April 14, 2009Assignee: Murata Manufacturing Co., Ltd.Inventors: Kazutaka Mukaiyama, Shigeyuki Mikami, Yohei Ishikawa
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Patent number: 7492243Abstract: A planar circuit having a conductive film on either main surface of a substrate. The conductive film on one of the main surfaces is patterned with two-dimensionally and repeatedly arranged unit cells, which are basic conductor patterns. Each of the unit cells has a capacitive region at the center thereof. Capacitance is induced between the center area and the conductor film formed on the main surface of the substrate opposite the center area. An area located near the middle of each of sides in the peripheral portion serves as an inductive region. In any two adjacent unit cells, the inductive regions have a multiple spiral-shaped conductor pattern, in which the center ends thereof are connected to each other at a halfway position between the two unit cells, and the outer peripheral ends thereof are connected to the capacitive regions.Type: GrantFiled: October 5, 2007Date of Patent: February 17, 2009Assignee: Murata Manufacturing Co., LtdInventors: Seiji Hidaka, Shigeyuki Mikami
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Patent number: 7408430Abstract: An undesired-wave propagation blocking circuit that blocks an undesired wave propagating between at least two parallel planar conductors is formed by a band eliminate filter including a plurality of stages of resonators and transmission lines each connecting the resonators in the respective stages. Each of the resonators in the respective stages has two spiral lines that extend in parallel to each other from each root portion, and leading ends of the spiral lines are connected to each other. Each root portion of the two spiral lines of the resonators is connected to a plurality of positions of the two transmission lines, and each of the resonators is short-circuited at one of respective short-circuit portions, which is a root portion.Type: GrantFiled: April 20, 2005Date of Patent: August 5, 2008Assignee: Murata Manufacturing Co., Ltd.Inventor: Shigeyuki Mikami
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Publication number: 20080088391Abstract: A planar circuit having a conductive film on either main surface of a substrate. The conductive film on one of the main surfaces is patterned with two-dimensionally and repeatedly arranged unit cells, which are basic conductor patterns. Each of the unit cells has a capacitive region at the center thereof. Capacitance is induced between the center area and the conductor film formed on the main surface of the substrate opposite the center area. An area located near the middle of each of sides in the peripheral portion serves as an inductive region. In any two adjacent unit cells, the inductive regions have a multiple spiral-shaped conductor pattern, in which the center ends thereof are connected to each other at a halfway position between the two unit cells, and the outer peripheral ends thereof are connected to the capacitive regions.Type: ApplicationFiled: October 5, 2007Publication date: April 17, 2008Inventors: Seiji Hidaka, Shigeyuki Mikami
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Dielectric resonator device, dielectric filter, duplexer, and high-frequency communication apparatus
Patent number: 7274273Abstract: Electrodes (2) and (3) are formed on the front face (1A) and the rear face (1B) of a dielectric substrate (1). Fan-shaped apertures (4A) and (4B) forming a resonator (4) are formed in the electrodes (2) and (3) such that the fan-shaped aperture (4A) opposes the fan-shaped aperture (4B). Accordingly, two parameters, that is, the radius and the central angle, of the fan-shaped apertures (4A) and (4B) can be used to set the resonant frequency of the resonator (4), thus improving the flexibility in design of the resonator (4).Type: GrantFiled: March 1, 2004Date of Patent: September 25, 2007Assignee: Murata Manufacturing Co., Ltd.Inventors: Keiichi Hirose, Shigeyuki Mikami, Yutaka Sasaki, Toshiro Hiratsuka -
Publication number: 20070176713Abstract: A transmission line having a slot line with a slot formed on a front surface electrode on a dielectric substrate, and two such slot lines are positioned with the front surface electrodes separated from one another with a gap therebetween. A slot resonator with one end open at the gap side is provided at the front edge side of each slot line, and these slot resonators are positioned so as to be capable of coupling to one another. A slot stub which is branched out from the gap side is provided on each front surface electrode. Thus, leakage of a high-frequency signal in the gap can be suppressed with the slot stub.Type: ApplicationFiled: July 25, 2005Publication date: August 2, 2007Inventors: Kazutaka Mukaiyama, Shigeyuki Mikami, Yohei Ishikawa
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Publication number: 20070126532Abstract: An undesired-wave propagation blocking circuit that blocks an undesired wave propagating between at least two parallel planar conductors is formed by a band eliminate filter including a plurality of stages of resonators and transmission lines each connecting the resonators in the respective stages. Each of the resonators in the respective stages has two spiral lines that extend in parallel to each other from each root portion, and leading ends of the spiral lines are connected to each other. Each root portion of the two spiral lines of the resonators is connected to a plurality of positions of the two transmission lines, and each of the resonators is short-circuited at one of respective short-circuit portions, which is a root portion.Type: ApplicationFiled: April 20, 2005Publication date: June 7, 2007Inventor: Shigeyuki Mikami
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Publication number: 20070046402Abstract: A planar dielectric line having a first slot sandwiched between first and second electrodes is provided on a surface of a dielectric substrate. A second slot is positioned so as to face the first slot and is sandwiched between third and fourth electrodes on the rear face of the dielectric substrate. The width of the first slot is narrower than the width of the second slot so that the electromagnetic field energy of a high-frequency signal is concentrated in the first slot.Type: ApplicationFiled: July 29, 2004Publication date: March 1, 2007Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Kazutaka Mukaiyama, Shigeyuki Mikami, Koichi Sakamoto, Yohei Ishikawa
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Dielectric resonator device, dielectric filter, duplexer, and high-frequency communication apparatus
Publication number: 20060152302Abstract: Electrodes (2) and (3) are formed on the front face (1A) and the rear face (1B) of a dielectric substrate (1). Fan-shaped apertures (4A) and (4B) forming a resonator (4) are formed in the electrodes (2) and (3) such that the fan-shaped aperture (4A) opposes the fan-shaped aperture (4B). Accordingly, two parameters, that is, the radius and the central angle, of the fan-shaped apertures (4A) and (4B) can be used to set the resonant frequency of the resonator (4), thus improving the flexibility in design of the resonator (4).Type: ApplicationFiled: March 1, 2004Publication date: July 13, 2006Inventors: Keiichi Hirose, Shigeyuki Mikami, Yutaka Sasaki, Toshiro Hiratsuka -
Patent number: 6943651Abstract: A dielectric resonator device includes a dielectric substrate. Electrode films are formed on the front and back surfaces of the dielectric substrate, respectively. A TE010-mode resonator is constituted by two circular openings which oppose each other and which are formed in the electrode films. Two opposing slots formed in the electrode films constitute a planar dielectric transmission line (PDTL). The PDTL is connected to the TE010-mode resonator. An excitation section is formed by extending two portions of each electrode film on two side of each slot into each opening.Type: GrantFiled: April 17, 2003Date of Patent: September 13, 2005Assignee: Murata Manufacturing Co., Ltd.Inventors: Kazutaka Mukaiyama, Shigeyuki Mikami, Hiroyasu Matsuzaki, Kiyoharu Kochi, Akiko Kochi, Takahiro Baba, Koichi Sakamoto, Tetsuya Kochi
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Patent number: 6891452Abstract: 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: GrantFiled: February 26, 2003Date of Patent: May 10, 2005Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Kiyoharu Kochi, Akiko Kochi, Hiroyasu Matsuzaki, Kazutaka Mukaiyama, Koichi Sakamoto, Yohei Ishikawa, Tetsuya Kouchi
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Patent number: 6778031Abstract: 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: GrantFiled: March 27, 2003Date of Patent: August 17, 2004Assignee: Murata Manufacturing Co. LtdInventors: Takahiro Baba, Koichi Sakamoto, Shigeyuki Mikami, Hiroyasu Matsuzaki, Takatoshi Kato, Yohei Ishikawa, Koichi Takizawa
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Patent number: 6737687Abstract: A field-effect transistor device includes an active area on a semiconductor substrate and a gate electrode, a source electrode, and a drain electrode are disposed on the surface of the active area, so as to define an FET portion. An electrode defining a line for connection to the gate, an electrode defining a line for connection to the source, and an electrode defining a line for connection to the drain are disposed on the semiconductor substrate. The electrodes define a slot line on the input side for supplying a signal to the FET portion, and a slot line on the output side from which a signal of the FET portion is output. The gate electrode has a shape which extends along the direction that approximately perpendicular to the conduction direction of the signal through the slot line on the input side.Type: GrantFiled: February 6, 2003Date of Patent: May 18, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Takahiro Baba, Koichi Sakamoto, Shigeyuki Mikami, Hiroyasu Matsuzaki
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Publication number: 20040041668Abstract: 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: ApplicationFiled: February 26, 2003Publication date: March 4, 2004Inventors: Shigeyuki Mikami, Tetsuya Kochi, Hiroyasu Matsuzaki, Kazutaka Mukaiyama, Koichi Sakamoto, Yohei Ishikawa, Kiyoharu Kochi, Akiko Kochi
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Publication number: 20040036542Abstract: 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: ApplicationFiled: March 27, 2003Publication date: February 26, 2004Inventors: Takahiro Baba, Koichi Sakamoto, Shigeyuki Mikami, Hiroyasu Matsuzaki, Takatoshi Kato, Yohei Ishikawa, Koichi Takizawa
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Publication number: 20040021531Abstract: A dielectric resonator device includes a dielectric substrate. Electrode films are formed on the front and back surfaces of the dielectric substrate, respectively. A TE010-mode resonator is constituted by two circular openings which oppose each other and which are formed in the electrode films. Two opposing slots formed in the electrode films constitute a planar dielectric transmission line (PDTL). The PDTL is connected to the TE010-mode resonator. An excitation section is formed by extending two portions of each electrode film on two side of each slot into each opening.Type: ApplicationFiled: April 17, 2003Publication date: February 5, 2004Inventors: Kazutaka Mukaiyama, Shigeyuki Mikami, Hiroyasu Matsuzaki, Tetsuya Kochi, Takahiro Baba, Koichi Sakamoto, Kiyoharu Kochi, Akiko Kochi
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Patent number: 6628230Abstract: 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: GrantFiled: September 19, 2002Date of Patent: September 30, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Tetsuya Kouchi, Hiroyasu Matsuzaki, Kazutaka Mukaiyama, Koichi Sakamoto, Toshiro Hiratsuka, Takatoshi Kato, Yohei Ishikawa
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Publication number: 20030160279Abstract: A field-effect transistor device includes an active area on a semiconductor substrate and a gate electrode, a source electrode, and a drain electrode are disposed on the surface of the active area, so as to define an FET portion. An electrode defining a line for connection to the gate, an electrode defining a line for connection to the source, and an electrode defining a line for connection to the drain are disposed on the semiconductor substrate. The electrodes define a slot line on the input side for supplying a signal to the FET portion, and a slot line on the output side from which a signal of the FET portion is output. The gate electrode has a shape which extends along the direction that approximately perpendicular to the conduction direction of the signal through the slot line on the input side.Type: ApplicationFiled: February 6, 2003Publication date: August 28, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Takahiro Baba, Koichi Sakamoto, Shigeyuki Mikami, Hiroyasu Matsuzaki
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Patent number: 6606000Abstract: A radio-frequency amplifier comprises slot lines formed in a top electrode which are bent to define matching segments that are perpendicular to transmitting segments. The matching segments have a length corresponding to one-quarter of the wavelength of a signal to be amplified and are at least partially perpendicular to the transmitting segments. A DC-cut circuit comprising slot lines is connected to the matching segments, an FET is connected to the transmitting segments and the matching segments, and respective matching circuits serve as an input unit and an output unit of the FET. Source terminals of the FET are connected to parts of a top electrode that do not lie between the segments. A drain terminal and a gate terminal are connected, to be electrically separated from each other, to parts of the top electrode, which are electrically separated from the source terminals by the DC-cut circuit, the transmitting segments, and the matching segments.Type: GrantFiled: March 13, 2002Date of Patent: August 12, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Takatoshi Kato, Hiroyasu Matsuzaki
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Publication number: 20030085836Abstract: 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: ApplicationFiled: September 19, 2002Publication date: May 8, 2003Inventors: Shigeyuki Mikami, Tetsuya Kouchi, Hiroyasu Matsuzaki, Kazutaka Mukaiyama, Koichi Sakamoto, Toshiro Hiratsuka, Takatoshi Kato, Yohei Ishikawa