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).
-
Patent number: 6538526Abstract: Electrodes having slot patterns, electrodes having strip patterns, or dielectric strips, for example, form transmission lines and resonator patterns on the upper faces of dielectric substrates or conductive substrates, for example. Resonators formed by the resonator patterns are arranged at the ends of the transmission lines at the end portions of the substrates. A pair of the resonators are electromagnetically coupled to each other, whereby the corresponding transmission lines are also connected to each other.Type: GrantFiled: April 18, 2001Date of Patent: March 25, 2003Assignee: Murata Manufacturing Co. LtdInventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda, Kiyoshi Kanagawa
-
Patent number: 6531934Abstract: A dielectric filter comprises a dielectric substrate having two opposing main surfaces on which electrodes are formed. Electrodeless portions are formed in the electrodes on the two main surfaces. Conductors are arranged a fixed distance away from the dielectric substrate. The electrodes have projections and/or recesses formed in the boundary region between the electrodeless portion and the electrode.Type: GrantFiled: February 10, 2000Date of Patent: March 11, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda, Kiyoshi Kanagawa
-
Patent number: 6512429Abstract: Lines for input/output to be respectively coupled with two resonators formed on a dielectric plate, and a coupling line for polarization to be respectively coupled with two resonators which may be separated from each other by one or more other stages to achieve the jump-coupling between the resonators, are respectively formed on an substrate in order to solve problems including the increase in dead space, the increase in the machining and assembly processes for forming a coupling loop, and the reproductivity of characteristics which are caused by using a cable for jump-coupling in polarizing a dielectric filter of planar circuit type.Type: GrantFiled: August 10, 2001Date of Patent: January 28, 2003Assignee: Murata Manufacturing Co., Ltd.Inventors: Toshiro Hiratsuka, Tomiya Sonoda, Shigeyuki Mikami, Kiyoshi Kanagawa
-
Publication number: 20020130723Abstract: 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: ApplicationFiled: March 13, 2002Publication date: September 19, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Takatoshi Kato, Hiroyasu Matsuzaki
-
Patent number: 6445263Abstract: The invention provides. a dielectric resonator for example in the TE010 mode characterized in that electrodes are formed on both principal surfaces of a dielectric plate in such a manner that influence of spurious waves propagating in a space between the electrodes and a conductive plate is prevented thus preventing the reduction in Qo and degradation in the attenuation characteristic in the frequency ranges outside the passband. The inner diameter of the cavity is selected such that when the cavity is regarded as a waveguide the cutoff frequency of the waveguide becomes higher than the resonant frequency of a resonance region and such that the inner diameter of the cavity is greater than a non-electrode part.Type: GrantFiled: May 8, 2000Date of Patent: September 3, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Tomiya Sonoda, Toshiro Hiratsuka, Yutaka Ida, Shigeyuki Mikami, Kiyoshi Kanagawa
-
Publication number: 20020027486Abstract: Electrodes having slot patterns, electrodes having strip patterns, or dielectric strips, for example, form transmission lines and resonator patterns on the upper faces of dielectric substrates or conductive substrates, for example. Resonators formed by the resonator patterns are arranged at the ends of the transmission lines at the end portions of the substrates. A pair of the resonators are electromagnetically coupled to each other, whereby the corresponding transmission lines are also connected to each other.Type: ApplicationFiled: April 18, 2001Publication date: March 7, 2002Applicant: Murata Manufacturing Co., Inc.Inventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda, Kiyoshi Kanagawa
-
Publication number: 20020017968Abstract: Lines for input/output to be respectively coupled with two resonators formed on a dielectric plate, and a coupling line for polarization to be respectively coupled with two resonators which may be separated from each other by one or more other stages to achieve the jump-coupling between the resonators, are respectively formed on an substrate in order to solve problems including the increase in dead space, the increase in the machining and assembly processes for forming a coupling loop, and the reproductivity of characteristics which are caused by using a cable for jump-coupling in polarizing a dielectric filter of planar circuit type.Type: ApplicationFiled: August 10, 2001Publication date: February 14, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Toshiro Hiratsuka, Tomiya Sonoda, Shigeyuki Mikami, Kiyoshi Kanagawa
-
Publication number: 20020000899Abstract: Lines for input/output to be respectively coupled with two resonators formed on a dielectric plate, and a coupling line for polarization to be respectively coupled with two resonators which may be separated from each other by one or more other stages to achieve jump-coupling between the resonators, are respectively formed on an substrate in order to solve problems including and increase in dead space, the increase in the machining and assembly processes for forming a coupling loop, and the reproductivity of characteristics which are caused by using a cable for jump-coupling in polarizing a dielectric filter of planar circuit type.Type: ApplicationFiled: June 17, 1999Publication date: January 3, 2002Inventors: TOSHIRO HIRATSUKA, TOMIYA SONODA, SHIGEYUKI MIKAMI, KIYOSHI KANAGAWA
-
Patent number: 6331808Abstract: A dielectric resonator device having characteristics of a plane circuit type dielectric resonator device applicable to miniaturization is included. Non-loading Q0 of a resonator is increased so as to decrease insertion loss in the case of forming a band sass filter, or the like. Changes in filter characteristics with respect to changes in structural dimensions of the length of the resonator, the gap between the resonators, or the like, are reduced. There is an increase in the freedom in adjustment of resonant frequency to enhance production efficiency. In this arrangement, on each main surface of a dielectric plate is disposed an electrode having mutually opposing openings, which serve as a rectangular-slot mode dielectric resonator; in which the length of the resonator is longer than a half-wave length at the resonant frequency being used so as to resonate in a higher mode.Type: GrantFiled: December 13, 2000Date of Patent: December 18, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda
-
Publication number: 20010015683Abstract: A dielectric resonator device is disclosed in which characteristics of a plane circuit type dielectric resonator device applicable to miniaturization is included; non-loading Q0f a resonator is increased so as to decrease insertion loss in the case of forming a band pass filter, or the like; reduce changes in filter characteristics with respect to changes in structural dimensions of the length of the resonator, the gap between the resonators, or the like; and increase freedom in adjustment of resonant frequency to enhance production efficiency. In this arrangement, on each main surface of a dielectric plate are disposed an electrode having mutually opposing openings, which serve as a rectangular-slot mode dielectric resonator; in which the length of the resonator is longer than the half-wave length in the resonant frequency used so as to resonate in a higher mode.Type: ApplicationFiled: December 13, 2000Publication date: August 23, 2001Inventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda
-
Patent number: 6249195Abstract: A dielectric filter provided in this invention has insertion-loss characteristics of 2 dB or lower in the range of 1 to 2% of a specific band. The dielectric filter includes an upper case and a lower case, a dielectric substrate, an electrode formed on mutually opposing surfaces thereof, and a plurality of pairs of openings formed in the electrodes on the two opposing surfaces, so as to form a plurality of dielectric resonators, and input-output couplers for coupling to each of an input-stage dielectric resonator and an output-stage dielectric resonator among the plurality of dielectric resonators. In the input-stage and output-stage dielectric resonators, the opening of the electrode is rectangular or polygonal, whereas in at least one of the dielectric resonators other than the input-stage and output-stage dielectric resonators, it is substantially circular.Type: GrantFiled: September 7, 1999Date of Patent: June 19, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda, Kiyoshi Kanagawa
-
Dielectric resonator device, dielectric filter, oscillator, sharing device, and electronic apparatus
Patent number: 6232854Abstract: In a dielectric resonator device, electrodes having electrode non-formation sections opposite to each other and having substantially the same shape and size are formed on the opposite main faces of a dielectric plate. The portion of the dielectric plate sandwiched between the electrode non-formation sections opposite to each other is used as a dielectric resonator section. Further, the characteristics of the dielectric resonator device are adjusted by attaching dielectric chips inside of the dielectric resonator section or between adjacent dielectric resonator sections.Type: GrantFiled: April 23, 1999Date of Patent: May 15, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda, Yutaka Ida, Kiyoshi Kanagawa -
Patent number: 6184758Abstract: Proposed are a resonator which can easily establish coupling with input/output means, an external circuit, etc., and a filter, duplexer and communication apparatus each having a wide-band frequency characteristic. Electrodes having polygonal openings defined therein are formed in both principal planes of a dielectric substrate such that the openings are positioned to face each other. The dielectric substrate is arranged with the aid of spacers between a metal-made upper conductor case and a lower conductor case having a shield conductor formed therein, the upper and lower conductor cases being positioned to face each other with gaps left relative to the dielectric substrate. Portions of the dielectric substrate between pairs of the openings facing to each other serve as resonance areas and are coupled respectively with input/output electrodes.Type: GrantFiled: March 5, 1998Date of Patent: February 6, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Yohei Ishikawa, Toshiro Hiratsuka, Tomiya Sonoda, Shigeyuki Mikami, Yutaka Ida, Kiyoshi Kanagawa
-
Patent number: 6177854Abstract: A dielectric resonator device having characteristics of a plane circuit type dielectric resonator device applicable to miniaturization. Non-loading QD of a resonator is increased so as to decrease insertion loss in the case of forming a band pass filter, or the like. Changes in filter characteristics with respect to changes in structural dimensions of the length of the resonator, the gap between the resonators, or the like, are reduced. There is an increase in the freedom in adjustment of resonant frequency to enhance production efficiency. In this arrangement, on each main surface of a dielectric plate is disposed an electrode having mutually opposing openings, which serve as a rectangular-slot mode dielectric resonator; in which the length of the resonator is longer than a half-wave length at the resonant frequency being used so as to resonate in a higher mode.Type: GrantFiled: April 1, 1999Date of Patent: January 23, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Toshiro Hiratsuka, Tomiya Sonoda
-
Patent number: 6121855Abstract: A dielectric filter is formed by electrode non-formation parts (openings) disposed on opposite main surfaces of a dielectric plate so as to form a dielectric resonator, as well as two coupling members coupled to said dielectric resonator. A large amount of attenuation required for blocking a certain frequency is secured by generating an attenuation pole in the area of that frequency. The two coupling members may be constituted by probes or other structures. The two coupling members are non-parallel to each other, and one of the coupling members is coupled with at least two coupling modes of the resonator.Type: GrantFiled: March 25, 1998Date of Patent: September 19, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Toshiro Hiratsuka, Tomiya Sonoda, Shigeyuki Mikami, Kenichi Iio
-
Patent number: 6104261Abstract: The invention provides a dielectric resonator for example in the TE010 mode characterized in that electrodes are formed on both principal surfaces of a dielectric plate in such a manner that influence of spurious waves propagating in a space between the electrodes and a conductive plate is prevented thus preventing the reduction in Qo and degradation in the attenuation characteristic in the frequency ranges outside the passband. The inner diameter of the cavity is selected such that when the cavity is regarded as a waveguide the cutoff frequency of the waveguide becomes higher than the resonant frequency of a resonance region and such that the inner diameter of the cavity is greater than a non-electrode part.Type: GrantFiled: May 20, 1998Date of Patent: August 15, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Tomiya Sonoda, Toshiro Hiratsuka, Yutaka Ida, Shigeyuki Mikami, Kiyoshi Kanagawa
-
Patent number: 6057745Abstract: In a dielectric filter in which electrodes are formed on both principal planes of a dielectric plate while pairs of electrode non-formed portions having substantially the same shape are defined in the electrodes in opposing relation, areas positioned between the pairs of opposing electrode non-formed portions serve as resonance areas, coupling members are provided to be coupled with the resonance areas, and a cavity is provided to define a space surrounding the resonance areas and the coupling members, a signal is prevented from propagating in the parallel plate mode through a waveguide path formed between electrodes formed on both principal planes of the base plate serving as part of a cavity. Electrodes are formed on both principal planes of a dielectric plate (3) with pairs of electrode non-formed portions (4a, 4b, 4c, etc.) defined in the electrodes in opposing relation so that areas positioned between the electrode non-formed portions serve as resonance areas.Type: GrantFiled: April 21, 1998Date of Patent: May 2, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Tomiya Sonoda, Toshiro Hiratsuka, Yutaka Ida, Shigeyuki Mikami, Kiyoshi Kanagawa
-
Patent number: 6016090Abstract: A dielectric substrate is provided on both its main surfaces with conductors each having two circular openings such that the openings on both main surfaces oppose each other. On one conductor of the dielectric substrate, an insulating layer is formed. On the insulating layer, an input electrode and an output electrode are formed. Electrically conductive plates are disposed and secured such that they sandwich the dielectric substrate with gaps therebetween.Type: GrantFiled: November 6, 1997Date of Patent: January 18, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Kenichi Iio, Koichi Sakamoto, Sadao Yamashita, Toshihiro Hiratsuka, Tomiya Sonoda, Shigeyuki Mikami
-
Patent number: 5736912Abstract: A frequency adjustment mechanism for a dielectric resonator in which a change of a unloaded Q is small by adjustment of a resonating frequency, a tuning rod may be stably fixed in place after the adjustment without using any adhesives or the like and it is possible to readily perform the re-adjustment. A hole 14 is provided at an axially central portion of the dielectric resonator 11 and the tuning rod 15 is threadingly inserted into the hole 14. A female screw thread 14a is formed in an inner circumferential surface of the hole 14, and a male screw thread 15a is formed on an outer circumferential surface of the tuning rod 15. Resin layers 16 and 17 are formed on surfaces of the female screw thread 14a and the male screw thread 15a, respectively. The tuning rod 15 is made of dielectric material having a low loss and a high dielectric constant. The resin layers 16 and 17 are made of resin material having an elasticity and a low loss.Type: GrantFiled: June 1, 1995Date of Patent: April 7, 1998Assignee: Murata Manufacturing Co., Ltd.Inventors: Shigeyuki Mikami, Hirotsugu Abe, Yukio Higuchi
-
Patent number: 5311160Abstract: A mechanism for adjusting the resonance frequency of a dielectric resonator having TE.sub.01.delta. mode as its operation mode under the presence of the electromagnetic field including: a hole extending along the axis of the dielectric resonator; a tuning bar, made of a dielectric material of a low loss, having a male screw formed on the peripheral surface thereof; and a female screw, to engage the male screw, formed on the wall of the hole. The tuning bar is reciprocated in the hole with the tuning bar engaging the hole so as to adjust the resonance frequency.Type: GrantFiled: October 29, 1992Date of Patent: May 10, 1994Assignee: Murata Manufacturing Co., Ltd.Inventors: Yukio Higuchi, Hirotsugu Abe, Shigeyuki Mikami