Tdk Corporation

Takahide Kurahashi

Hidenori Ohata

Taro Miura

Makoto Kobayashi

Takashi Ito

Yasushi Iijima

Fumio Uchikoba

Kazuaki Suzuki

Shigeyuki Nakajima

Sakae Henmi

Makoto Hasegawa

Satoshi Tanaka

Hideki Sasaki

Makoto Iwasaki

Hajime Kato

Kenji Endou

Fumitaka Baba

Katsuhiko Igarashi

Shinya Nakai

Yoshinori Matsumaru

Seiichi Endo

Ryoichi Kondo

Akihito Watanabe

Hitoshi Maro

Keiichi Morimoto

In the rare earth sintered magnet, the ratio of R2 to the sum of R1 and R2 that are contained in crystal grain boundaries surrounding the crystal grains in the rare earth sintered magnet body is higher than the ratio of R2 to the sum of R1 and R2 in the crystal grains, and the concentration of R2 increases from the central portion of the rare earth sintered magnet body toward the surface of the rare earth sintered magnet body. In addition, the degree of unevenness in residual magnetic flux density on the surface of the rare earth sintered magnet body is smaller than 3.0%.

Rare earth sintered magnet and motor

A technique for improving a circulator element for its temperature characteristic is provided. A circulator element including a garnet type ferrite material, and a permanent magnet for applying a direct-current magnetic field to the garnet type ferrite material, wherein Srepresents the saturation magnetization of said garnet type ferrite material at a temperature TSrepresents one at a temperature Tand Srepresents one at a temperature Tand Srepresents the saturation magnetization of said permanent magnet at a temperature TSrepresents one at a temperature Tand Srepresents one at a temperature Twhere TTTand the saturation magnetizations SSSSSand Sare relative values providing that the saturation magnetizations at the temperature Tis 1, and

Circulator element

An isolator device with a built-in power amplifier includes a single dielectric multi-layered substrate, a high frequency power amplifier circuit, an isolator element, and circuit elements provided to the dielectric multi-layered substrate. The high frequency power amplifier circuit and the isolator element are connected with each other through the circuit elements and united with the single dielectric multi-layered substrate.

Isolator device with built-in power amplifier and embedded substrate capacitor

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 multilayer ceramic part of the invention comprises an internal conductor layer and a ceramic layer which are formed by co-firing. The internal conductor layer is formed of an electrical conducting material containing silver as a main component, and the ceramic layer is formed of an yttrium-iron-garnet based oxide magnetic material with silver added thereto. Thus, the multilayer ceramic part can be fabricated in high yields, even when its size is much more smaller than that of a multilayer ceramic part fabricated until now.

Multilayer ceramic part

A non-reciprocal circuit element includes a plurality of inner conductors intersecting with keeping insulation with each other, a shield conductor connected in common to one end of the inner conductors, and a capacitor connected between the shield conductor and a ground of the non-reciprocal circuit element, for adjusting only eigen values of in-phase excitation. Thus, smaller size, lighter weight and lower height can be attained and also temperature characteristics can be optionally adjusted without changing material used and without inviting increased insertion loss.

Non-reciprocal circuit element with a capacitor between the shield conductor and ground to lower the operating frequency

Conductor paste and multilayer ceramic part using the same

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

Electronic filtering part using a material with microwave absorbing

Growing community of inventors

Tokyo, Japan

Takahide Kurahashi