Hitachi Metals, Ltd.

Hitchi Metals, Ltd.

Hideto Horiguchi

Hiroyuki Itoh

Yasushi Kishimoto

Shinichirou Takeuchi

Shinji Yamamoto

Koji Ichikawa

Yuta Sugiyama

Shigeru Takeda

Shuichi Watanabe

Manabu Yumoto

Youichi Takahashi

Yukinori Arita

A two-port isolator comprising a thin ferrite plate, a permanent magnet for applying a static magnetic field to the thin ferrite plate, first and second central conductors disposed substantially in a center portion of the thin ferrite plate and crossing each other with electric insulation, first and second input-output terminals each connected to an end of each of the first and second central conductors, a common terminal connected to the other ends of the first and second central conductors, a first matching capacitor connected between the first input-output terminal and the common terminal, a second matching capacitor connected between the second input-output terminal and the common terminal, and a resistor connected between the first input-output terminal and the second input-output terminal, wherein the DC resistance of the resistor is set, such that with loss in a high-frequency signal entering into the first input-output terminal and exiting from the second input-output terminal defined as insertion loss, and with loss in a high-frequency signal entering into the second input-output terminal and exiting from the first input-output terminal defined as isolation loss, the insertion loss is smaller than the isolation, and that the isolation loss increases as a static magnetic field applied to the two-terminal isolator from outside increases.

Two-port isolator and method for evaluating it

An irreversible circuit module includes a permanent magnet for providing a DC magnetic field for a magnetic member; an assembly having a magnetic member provided with a plurality of conductors being common on one end and serving as input and output terminals for high-frequency signals on the other end; a plurality of load capacitors connected to the conductors, the load capacitors being formed in a laminate having a conductor layer: a first transmission line connected to any of the conductors; and a second transmission line coupled magnetically to the first transmission line. The first transmission line and the second transmission line are included in the laminate. The assembly is received in a hole in the middle of the laminate.

Irreversible circuit module including a directional coupler

A non-reciprocal circuit device comprising a plurality of central conductors overlapping with electric insulation from each other at 120&deg;, a magnetic body disposed in contact with or close to the central conductors , matching capacitors, a permanent magnet disposed for applying a DC magnetic field to the central conductors and the magnetic body , and metal cases for receiving these parts and serving as a magnetic yoke, at least the matching capacitors being integrally constituted by a laminate module having a substantially flat lower surface, and the laminate module being disposed on a flat surface of a composite base comprising an insulation member and conductor plates.

Non-reciprocal circuit device and wireless communications equipment comprising same

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Tokyo, Japan

Hideto Horiguchi