Hitachi Metals, Ltd.

Hitchi Metals, Ltd.

Yasushi Kishimoto

Takefumi Terawaki

Hiroyuki Itoh

Shigeru Takeda

Shinichirou Takeuchi

Hideto Horiguchi

Shinji Yamamoto

Tsuyoshi Taketa

Kenji Kuramoto

Minoru Nozu

Shuichi Watanabe

Yukinori Arita

Minori Nozu

Manabu Yumoto

Youichi Takahashi

Hiroshi Matsuno

Kouji Ichikawa

Toru Ishida

A central conductor assembly for a non-reciprocal circuit device, at least a first central conductor constituting a first inductance element and a second central conductor constituting a second inductance element being integrally formed in a laminate comprising pluralities of magnetic layers, the first central conductor being formed by series-connecting first and second lines formed on a first main surface of the laminate to third lines formed in the laminate through via-holes, and the second central conductor being formed on the first main surface of the laminate such that it extends between the first and second lines and crosses the third lines via a magnetic layer.

Non-reciprocal circuit device and its central conductor assembly

A central conductor assembly for use in a non-reciprocal circuit comprising a first inductance element between a first input/output port and a second input/output port, and a second inductance element between the second input/output port and a ground port, a magnetic substrate being integrally provided with a first central conductor constituting the first inductance element and a second central conductor constituting the second inductance element; and the second central conductor being crossing the first central conductor on a main surface side of the substrate via a magnetic layer or a dielectric layer, with at least one end portion thereof bent such that high-frequency current flows therethrough in the same direction as or in an opposite direction to that of high-frequency current flowing through the first central conductor.

Non-reciprocal circuit and non-reciprocal circuit device, and central conductor assembly used therein

A non-reciprocal circuit device comprising a first inductance element disposed between a first input/output port and a second input/output port; a second inductance element disposed between the second input/output port and the ground; a first capacitance element constituting a first parallel resonance circuit with the first inductance element; a resistance element parallel-connected to the first parallel resonance circuit; a third inductance element series-connected between the second inductance element and the ground; and a second capacitance element constituting a second parallel resonance circuit with the second and third inductance elements.

Non-reciprocal circuit device

A non-reciprocal circuit device comprising a first inductance element Ldisposed between a first input/output port Pand a second input/output port P, a first capacitance element Ci parallel-connected to the first inductance element Lto constitute a first resonance circuit, a resistance element R parallel-connected to the first parallel resonance circuit, a second inductance element Ldisposed between a second input/output port Pof the first resonance circuit and a ground, a second capacitance element Cfa parallel-connected to the second inductance element Lto constitute a second resonance circuit, a third inductance element Lg disposed between the second resonance circuit and the ground, and a third capacitance element Cfb disposed between a second input/output port Pof the first resonance circuit and the ground.

A non-reciprocal circuit device comprising a first inductance element connected between a first input/output port and a second input/output port, a second inductance element connected between the second input/output port and the ground, a first capacitance element connected between the first input/output port and the second input/output port for constituting a parallel resonance circuit with the first inductance element, a second capacitance element connected between the second input/output port and the ground for constituting a parallel resonance circuit with the second inductance element, and a resistance element connected between the first input/output port and the second input/output port, the first and/or second capacitance elements being constituted by parallel-connecting capacitors formed by electrode patterns in a multilayer substrate comprising dielectric sheets and the electrode patterns to chip capacitors mounted onto the multilayer substrate.

A non-reciprocal circuit device comprising a first inductance element disposed between a first input/output port and a second input/output port, a second inductance element disposed between the second input/output port and a ground, a first capacitance element constituting a first parallel resonance circuit with the first inductance element, a second capacitance element constituting a second parallel resonance circuit with the second inductance element, a resistance element parallel-connected to the first parallel resonance circuit, and an impedance-adjusting means disposed between the first input/output port and the first inductance element.

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 concentrated constant, non-reciprocal device comprising a permanent magnet for applying a DC magnetic field to a ferrimagnetic body, an assembly in which at least a part of a plurality of center conductors one end of which serves as a common terminal and the other of which serves as a first input/output terminal is wound on or embedded in the ferrimagnetic body, a plurality of second input/output terminals, a plurality of impedance converting circuits connected between the second input/output terminals and the first input/output terminals, respectively, and a plurality of load capacitors connected between the first input/output terminals and the common terminals, respectively. The input impedance Z of the corresponding first input/output terminal at the operating center frequency and an external impedance Z connected with the corresponding second input/output terminal satisfy 0.05&lE;Z /Z &lE;0.9. As a result, it is possible to provide a small concentrated constant circulator/isolator of a wide band width having excellent electric characteristics.

Concentrated constant irreciprocal device

A strip line-type high-frequency element constituted by a laminate including a first ground conductor electrode substrate 2; a substrate 3 having a first strip line electrode 3a of less than one turn having a through-hole round electrode 3e; a substrate 4 having a second strip line electrode 4a of one or more turns having a through-hole electrode 4f; a substrate 5 having a third strip line electrode 5a of one or more turns having a through-hole round electrode 5e; a substrate 6 having a fourth strip line electrode 6a of less than one turn having a through-hole electrode 6f; a second ground conductor electrode substrate 7; and a protective substrate 8, wherein the through-hole round electrode 3e of the first strip line electrode 3a is connected to the through-hole electrode 4f of the second strip line 4a to form a first line, and the through-hole round electrode 5e of the third strip line electrode 5a is connected to the through-hole electrode 6f of the fourth strip line 6a to form a second line, one of the first and second lines being a main line while the other being a sub-line, whereby the strip line-type high-frequency element functions as a directional coupler.

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Tottori, Japan

Yasushi Kishimoto