Tdk Corporation

Tdk Electronics Company, Limited

Other

Taro Miura

Makoto Kobayashi

Takahide Kurahashi

Kazuaki Suzuki

Takashi Ito

Yasushi Iijima

Fumio Uchikoba

Tadao Fujii

Shigeyuki Nakajima

Ken Ishino

Shinya Nakai

Keizou Kawamura

Makoto Hasegawa

Takahiro Yamamoto

Akira Nakamura

Takashi Watanabe

Kenji Endou

Masashi Katsumata

Yasuo Hashimoto

Hidenori Ohata

Yoshikazu Fujishiro

Sakae Henmi

Yoshifumi Misu

Akira Usami

Yoshihiro Konishi

Suguru Kondoh

Norikazu Yasuda

The covering sheet includes at least one magnetic material layer made of a resin compound having an oxide magnetic material or a metal magnetic material mixed therein, a ground conductor layer laminated on one surface of the magnetic material layer, and a plurality of via holes for passing conducting unit for grounding the ground conductor layer, or includes a laminate consisting of at least one magnetic material layer made of a resin compound having an oxide magnetic material or a metal magnetic material mixed therein and at least one dielectric layer having a permittivity lower than that of the magnetic material layer, and a ground conductor layer laminated on one surface of the laminate.

Covering sheet, triplate line using the sheet, signal bus for computer using the sheet and covering structure of electronic circuit using the sheet

An absorptive circuit element includes a core body made of non-conductive material, an inner conductor formed by winding a conductive wire around the core body with a gap provided between adjacent turns, a magnetic material surrounding outside of the inner conductor, the magnetic material being made of composite material containing ferromagnetic fine metal powder and insulating resin, a dielectric surrounding outside of the magnetic material, and an outer conductor formed on a surface of the dielectric.

Absorptive circuit element, absorptive low-pass filter and manufacturing method of the filter

A non-reciprocal circuit element includes a microstrip TM resonator (n is a positive integer) with a metal disk and branches projecting from the metal disk in a trigonally symmetric structure, and a ferrite magnetic body spontaneously magnetized and coaxially disposed on the microstrip TM resonator. The metal disk and the branches are formed on a non-magnetic dielectric board having a ground conductor on its bottom face. The ferrite magnetic body is arranged so that a position of an electric field node matches to one of the branches.

Non-reciprocal circuit element and millimeter-wave hybrid integrated circuit board with the non-reciprocal circuit element

A lumped element circulator having a plurality of operation bands, has a circulator element with a plurality of signal ports and a grounded terminal, and resonance circuits connected between the signal ports and the grounded terminal, respectively, each of the resonance circuits having a plurality of resonance points. The number of the operation bands is equal to the number of the resonance points of each of the resonance circuits.

Lumped element circulator having a plurality of separated operation bands

A ground conductor and a signal conductor are provided in an insulating magnetic body respectively. The insulating magnetic body is a compound member that combines ferromagnetic metal particles and an insulating resin. A signal transmission element, a connector or a circuit board with high frequency stopping and low pass characteristics which will ensure reliable absorption of high frequency components in the high frequency range, can be provided. The ground conductor and the signal conductor are provided on opposite sides of the insulating magnetic body.

Electronic part using a material with microwave absorbing properties

A ground conductor and a signal conductor are provided in an insulating magnetic body respectively. The insulating magnetic body is a compound member that combines ferromagnetic metal particles and an insulating resin. A signal transmission element, a connector or a circuit board with high frequency stopping and low pass characteristics which will ensure reliable absorption of high frequency components in the high frequency range, can be provided.

Connector using a material with microwave absorbing properties

An object is to densify an internal conductor of a multilayer ceramic part to thereby reduce a line loss, improve operating properties such as Q value, and reduce a variation thereof. To this end, an internal conductor paste which is composed of conductor powder, preferably silver or copper powder and optionally, a glass frit is stacked with dielectric ceramic material layers and co-fired at or above the melting point of the conductor.

Multilayer ceramic parts and method for making

A multilayer ceramic part including dielectric ceramic layers and internal conductor layers is prepared by forming dielectric ceramic layers from an oxide system dielectric ceramic material having a sintering completion temperature between the melting point and the boiling point of the internal conductor. A pattern of internal conductor is formed on dielectric ceramic layers. The dielectric ceramic layers are placed one on another so as to sandwich the internal conductor pattern therebetween. The laminate is fired at or above the melting point of the internal conductor, optionally in an atmosphere having a controlled oxygen partial pressure. Since the dielectric ceramic material has an improved dielectric constant and dielectric loss and the internal conductor is densified and improved in surface property, the part is improved in resonator Q value and other properties. This minimizes the occurrence of defective parts in which the internal conductor is separated from the dielectric ceramic layer and minimizes a failure in the internal conductor layer.

Multilayer ceramic parts

A method of manufacturing a circulator includes the steps of forming, on at least one sheet (41, 42) of an insulating ferromagnetic material, dummy inner conductors (44a, 44b, 44c, 45a, 45b, 45e) made of a material which is thermally decomposed at a temperature equal to or less than a sintering completion temperature of the insulating ferromagnetic material, laminating a plurality of the sheets (40, 41, 42) of the insulating ferromagnetic material so that at least one insulating ferromagnetic material sheet (40, 41) covers the dummy inner conductors formed on the sheets (41, 42), firing the laminated insulating ferromagnetic material sheets (40, 41, 42) to form an insulating ferromagnetic material body (46) in a single continuous body and to form ducts (47) for inner conductors at portions occupied by the dummy inner conductors, injecting with pressure conductive paste into the ducts (47) in the insulating ferromagnetic material body (46), and firing the insulating ferromagnetic material body (46) to form the inner conductors (48) in the insulating ferromagnetic body (46).

Method of manufacturing microwave circulator

Electronic filtering part using a material with microwave absorbing

A circulator includes a circulator element (50) with inner conductors (41) having a predetermined pattern and an insulating ferromagnetic material body (40) closely surrounding the inner conductors. The insulating ferromagnetic material body is constituted by a fired single continuous body. The circulator also includes a plurality of terminal electrodes (76) formed on side surfaces of the circulator element and electrically connected to one end of the inner conductors, a plurality of circuit elements (51a, 51b, 51c) electrically connected to the terminal electrodes, and excitation permanent magnets (52, 53) for applying a dc magnetic field to the circulator element.

Multi-layer microwave circulator

Bandpass type filter having tri-plate line resonators

A flat wave absorber having a conductive plate, a dielectric plate on the conductive plate, and, a ferrite plate on said dielectric plate, provides a wide operational frequency range from 30 MHz to 1 GHz with excellent attenuation characteristics, and an anechoic chamber mounting said wave absorber on inside surface of the chamber is provided. Thickness of said dielectric plate is less than 25 mm, the thickness of said ferrite plate is less than 7.5 mm, and real part of complex impedance of said ferrite plate on the conductive plate is less than 1.0 and close to 1.0. Said ferrite plate is attached to said dielectric plate in the form of tiles.

Wave absorber, and an anechoic chamber using the same

A popped corn making apparatus used in a microwave oven comprises a bowl having an opening at the upper part and a narrow closed bottom and a substantially conical shape; and a resonator placed at the bottom of said bowl. The electric field resulted by resonance of said resonator under an application of microwave, is applied to grains of corn contained in said bowl to produce a popped corn. It is possible to use a lumped element resonator comprising a one turn coil having a ring shape having an opening which is placed at the bottom of said bowl and which is formed by an inductance provided by said coil and a capacitance provided by said bowl and said grains of corn.

Popped corn making apparatus used in a microwave oven

Apparatus for humidity measurement employing a dielectric resonator consisting essentially of a metallic guard, a solid dielectric material, an input antenna and an output antenna. Method of measuring humidity comprising feeding a microwave energy of swept frequencies to the input antenna of said appratus, recovering said energy as a microwave power from the output antenna, and then determining the humidity of the gas through which the microwave energy travels from one antenna to the other, the value of humidity being based on the frequency characteristic of said microwave power.

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Tokyo, Japan

Taro Miura