Hitachi Metals, Ltd.

Takefumi Terawaki

Yasushi Kishimoto

Shinji Yamamoto

Minoru Nozu

Minori Nozu

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.

Non-reciprocal circuit device

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 non-reciprocal circuit device comprising a ferrite plate, a magnet disposed opposite to a principal surface of the ferrite plate for applying a DC magnetic field, and a plurality of central conductors disposed on the side of the principal surface of the ferrite plate while crossing each other in an electrically insulating state, wherein (a) at least one of the central conductors is bent in a plane parallel with the principal surface of the ferrite plate, the remainder of the central conductors being straight; (b) the bent central conductor has a ground-side portion inside a bending point and an input/output terminal-connecting-side portion outside the bending point; and wherein (c) an angle &#x3b8;z between the connecting-side portion of the bent central conductor and the straight central conductor or a connecting-side portion of another bent central conductor is larger than an angle &#x3b8;a between the ground-side portion of the bent central conductor and the straight central conductor or a ground-side portion of another bent central conductor.

Growing community of inventors

Tottori, Japan

Takefumi Terawaki