Patents by Inventor Ikuo Takakuwa
Ikuo Takakuwa 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: 7095292Abstract: On one surface of a dielectric substrate having a thickness of one quarter of a signal wavelength, a ground electrode, and a strip line, one end thereof being connected to a high-frequency element via a wire, are formed. On the opposite surface thereof, which opposes a waveguide, a ground electrode is formed, a first electrode opening having a predetermined length and width is formed, opposite to a proximity of an open end of the strip line, and a second electrode opening is formed so that a center line of a width thereof is separated outward by one quarter of the signal wavelength from a conductor wall of the waveguide. Furthermore, via holes having a length of one quarter of the signal wavelength, electrically connecting the ground electrodes on either surface, are formed. The waveguide is disposed in proximity to the dielectric substrate so that a center of the first electrode opening coincides with that of the waveguide.Type: GrantFiled: September 3, 2002Date of Patent: August 22, 2006Assignee: Murata Manufacturing Co., Ltd.Inventors: Kazuya Sayanagi, Ikuo Takakuwa
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Patent number: 6822612Abstract: An antenna device capable of increasing the speed of scanning as well as extending the scanning angular range of a beam to obtain a high gain. A radar module and a communication apparatus having enhanced detection capabilities obtainable by using the antenna device. In the antenna device, electromagnetic waves radiated from a primary radiator are transmitted to a plurality of openings, e.g., dielectric lenses and/or reflectors or optical transmitters. The dielectric openings are arranged on a fixed portion and the primary radiator is arranged on a moving portion. The moving portion is displaced relatively with respect to the fixed portion. This arrangement enables the selection of an opening used for receiving each of the electromagnetic waves from the primary radiator to change the direction of the beam.Type: GrantFiled: September 26, 2001Date of Patent: November 23, 2004Assignee: Murata Manufacturing Co. LtdInventors: Yukio Takimoto, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa, Nobumasa Kitamori
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Publication number: 20030214457Abstract: 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: ApplicationFiled: March 12, 2003Publication date: November 20, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
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Patent number: 6597307Abstract: By changing the direction of a detection radio-wave beam within a detection-angle range and by detecting reflected-signal intensities, wherein each of the reflected-signal intensities is detected for each predetermined unit angle, moving averages of the reflected-signal intensities are calculated by using an angular width predetermined for a given distance as an average width. Thus, data of a reflected-signal-intensity distribution is obtained. Accordingly, the direction of a target is detected by finding the direction of the highest reflected-signal intensity.Type: GrantFiled: February 4, 2002Date of Patent: July 22, 2003Assignee: Murata Manufacturing Co. Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Ikuo Takakuwa, Tetsu Nishimura
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Patent number: 6580343Abstract: A dielectric waveguide designed to avoid the influence of reflection of electromagnetic waves at connected portions of dielectric strips and to have an improved characteristic. The distance L between connection planes between pairs of dielectric strips adjacent in the direction of propagation of an electromagnetic wave is set to an odd number multiple of ¼ of the guide wavelength. Reflected waves are thereby superposed in phase opposition to each other to cancel out. In this manner, propagation of a reflected signal to ports is limited.Type: GrantFiled: October 5, 2001Date of Patent: June 17, 2003Assignee: Murata Manufacturing Co. LtdInventors: Atsushi Saitoh, Toru Tanizaki, Hiroshi Nishida, Ikuo Takakuwa, Yoshinori Taguchi, Nobuhiro Kondo, Taiyo Nishiyama
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Patent number: 6563477Abstract: 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: GrantFiled: September 20, 2001Date of Patent: May 13, 2003Assignee: Murata Manufacturing Co. Ltd.Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
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Publication number: 20030042993Abstract: On one surface of a dielectric substrate having a thickness of one quarter of a signal wavelength, a ground electrode, and a strip line, one end thereof being connected to a high-frequency element via a wire, are formed. On the opposite surface thereof, which opposes a waveguide, a ground electrode is formed, a first electrode opening having a predetermined length and width is formed, opposite to a proximity of an open end of the strip line, and a second electrode opening is formed so that a center line of a width thereof is separated outward by one quarter of the signal wavelength from a conductor wall of the wave guide. Furthermore, via holes having a length of one quarter of the signal wavelength, electrically connecting the ground electrodes on either surface, are formed. The waveguide is disposed in proximity to the dielectric substrate so that a center of the first electrode opening coincides with that of the waveguide.Type: ApplicationFiled: September 3, 2002Publication date: March 6, 2003Inventors: Kazuya Sayanagi, Ikuo Takakuwa
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Publication number: 20020190895Abstract: By changing the direction of a detection radio-wave beam within a detection-angle range and by detecting reflected-signal intensities, wherein each of the reflected-signal intensities is detected for each predetermined unit angle, moving averages of the reflected-signal intensities are calculated by using an angular width predetermined for a given distance as an average width. Thus, data of a reflected-signal-intensity distribution is obtained. Accordingly, the direction of a target is detected by finding the direction of the highest reflected-signal intensity.Type: ApplicationFiled: February 4, 2002Publication date: December 19, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Motoi Nakanishi, Toru Ishii, Ikuo Takakuwa, Tetsu Nishimura
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Patent number: 6472961Abstract: In a non-radiative dielectric line, slots opposing each other are respectively formed on two conductive plates and a dielectric strip is disposed within both the slots to form a NRD guide. Convex portions “P” protruding in the lateral direction to the propagating direction of an electromagnetic wave are formed at a predetermined position of the dielectric strip 3 while concave portions “H” are formed on internal surfaces of the slots in the conductive plates 1 and 2 so as to mate the both of them with each other. Variations in characteristics due to the positional slippage of the dielectric strip and so forth are prevented, and even when the dielectric strip is produced by machining, etc., the process is easily performed. Characteristics as a transmission line are also maintained without disturbing the electromagnetic field distribution in a mode to be propagated.Type: GrantFiled: June 19, 2000Date of Patent: October 29, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Atsushi Saitoh, Hiroshi Nishida, Toru Tanizaki, Ikuo Takakuwa
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Patent number: 6445355Abstract: A non-radiative hybrid dielectric line transition permits a line transformation between two different types of non-radiative dielectric lines to be performed in a limited space. In addition, a non-radiative dielectric line component, an antenna apparatus, and a wireless apparatus include the above line transition. In this structure, a dielectric strip is disposed between a lower conductive plate and an upper conductive plate to form each of a hyper NRD waveguide (HNRD) and a normal NRD waveguide (NNRD). Between the two waveguides, grooves whose depths gradually become shallow from the HNRD to the NNRD are formed for receiving a third non-radiative dielectric line for performing a line transformation.Type: GrantFiled: December 28, 2000Date of Patent: September 3, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Nobumasa Kitamori, Ikuo Takakuwa
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Patent number: 6433741Abstract: A directional coupler including a first transmission line and a second transmission line adjacent to the first transmission line, the relative positions of the first transmission line and the second transmission line being changeable, an antenna element connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the antenna element.Type: GrantFiled: July 2, 1999Date of Patent: August 13, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Toru Tanizaki, Ikuo Takakuwa, Tomohiro Nagai, Kazutaka Higashi
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Publication number: 20020067314Abstract: An antenna device capable of increasing the speed of scanning as well as extending the scanning angular range of a beam to obtain a high gain. A radar module and a communication apparatus having enhanced detection capabilities obtainable by using the antenna device. In the antenna device, electromagnetic waves radiated from a primary radiator are transmitted to a plurality of openings, e.g., dielectric lenses and/or reflectors or optical transmitters. The dielectric openings are arranged on a fixed portion and the primary radiator is arranged on a moving portion. The moving portion is displaced relatively with respect to the fixed portion. This arrangement enables the selection of an opening used for receiving each of the electromagnetic waves from the primary radiator to change the direction of the beam.Type: ApplicationFiled: September 26, 2001Publication date: June 6, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Yukio Takimoto, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa, Nobumasa Kitamori
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Patent number: 6384694Abstract: A dielectric line converter which includes a dielectric stripline; an upper conductor surface and a lower conductor surface sandwiching the dielectric stripline; the upper and lower conductor surfaces having a first spacing in a first region along the dielectric stripline so as to form a first-kind dielectric line, a second spacing which is substantially zero in a second region so as to form a second-kind dielectric line, and a third spacing which is less than the first spacing in a line conversion region between the first and second regions. Grooves may be formed in the opposing surfaces of the upper and lower conductor surfaces, and the dielectric stripline may be arranged in the grooves. Impedance matching between the first-kind and second-kind dielectric lines is arranged n the line conversion region. The length of the line conversion portion may be set to be an odd multiple of &lgr;/4.Type: GrantFiled: October 21, 1999Date of Patent: May 7, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Toru Tanizaki, Ikuo Takakuwa, Atsushi Saitoh
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Patent number: 6362795Abstract: 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: GrantFiled: January 7, 1998Date of Patent: March 26, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
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Publication number: 20020021196Abstract: A dielectric waveguide designed to avoid the influence of reflection of electromagnetic waves at connected portions of dielectric strips and to have an improved characteristic. The distance L between connection planes between pairs of dielectric strips adjacent in the direction of propagation of an electromagnetic wave is set to an odd number multiple of ¼ of the guide wavelength. Reflected waves are thereby superposed in phase opposition to each other to cancel out. In this manner, propagation of a reflected signal to ports is limited.Type: ApplicationFiled: October 5, 2001Publication date: February 21, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Atsushi Saitoh, Toru Tanizaki, Hiroshi Nishida, Ikuo Takakuwa, Yoshinori Taguchi, Nobuhiro Kondo, Taiyo Nishiyama
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Publication number: 20020018017Abstract: A non-radiative hybrid dielectric line transition permits a line transformation between two different types of non-radiative dielectric lines to be performed in a limited space. In addition, a non-radiative dielectric line component, an antenna apparatus, and a wireless apparatus include the above line transition. In this structure, a dielectric strip is disposed between a lower conductive plate and an upper conductive plate to form each of a hyper NRD waveguide (HNRD) and a normal NRD waveguide (NNRD). Between the two waveguides, grooves whose depths gradually become shallow from the HNRD to the NNRD are formed for receiving a third non-radiative dielectric line for performing a line transformation.Type: ApplicationFiled: December 28, 2000Publication date: February 14, 2002Inventors: Nobumasa Kitamori, Ikuo Takakuwa
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Publication number: 20020018022Abstract: 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: ApplicationFiled: September 20, 2001Publication date: February 14, 2002Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
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Publication number: 20010052876Abstract: A directional coupler including a first transmission line and a second transmission line adjacent to the first transmission line, the relative positions of the first transmission line and the second transmission line being changeable, an antenna element connected to a part of the directional coupler, and a driving mechanism for driving the directional coupler and the antenna element.Type: ApplicationFiled: July 2, 1999Publication date: December 20, 2001Inventors: TORU TANIZAKI, IKUO TAKAKUWA, TOMOHIRO NAGAI, KAZUTAKA HIGASHI
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Patent number: 6331809Abstract: A nonradiative dielectric waveguide filter of the present invention permits the manufacturing process including the production of a dielectric strip to be simpler. The filter can be formed by a pillar dielectric strip. The nonradiative dielectric waveguide filter includes resonators, input-output connection units, and cut-off regions, in which the upper and lower conductor plates and a dielectric strip disposed therebetween form the filter. In one example, the main signal-transmitting mode is the LSM mode; a groove having a bottom and conductor walls is disposed in a position in which the conductor plates are opposing; the resonator is formed by fitting the dielectric strip into the groove; and the cut-off regions are formed by second grooves formed in the conductor plates adjacent to the dielectric strip.Type: GrantFiled: June 10, 1999Date of Patent: December 18, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Ikuo Takakuwa, Toru Tanizaki, Toshiro Hiratsuka
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Patent number: 6307451Abstract: A dielectric waveguide designed to avoid the influence of reflection of electromagnetic waves at connected portions of dielectric strips and to have an improved characteristic. A third dielectric strip is inserted in a part of a connection section at which a first dielectric strip and a second dielectric strip are connected to each other, and the distances between the three connection planes in said connection section are determined so that a wave reflected at the connection plane between the first and third dielectric strips, a wave reflected at the connection plane between the first and second dielectric strips, and a wave reflected at the connection plane between the second and third dielectric strips are superposed with a phase difference of 2&pgr;/3 from each other.Type: GrantFiled: July 13, 1998Date of Patent: October 23, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Atsushi Saitoh, Toru Tanizaki, Hiroshi Nishida, Ikuo Takakuwa, Yoshinori Taguchi, Nobuhiro Kondo, Taiyo Nishiyama