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US 6,639,485 B2Granted
Nonreciprocal circuit device and communication device using same
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakashi Hasegawa, Masakatsu Mori
Life of this patent
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Abstract
A compact, inexpensive nonreciprocal circuit device which provides a large attenuation in a particular frequency band, and a communication device incorporating the same. A series resonance circuit in which an inductor and a capacitor are connected in series to each other is connected between a first port of a central conductor and the ground, capacitors are connected between the ground and a second and a third ports of other central conductors and the ground, and a terminating resistor is connected to the third port.
Claims8
A nonreciprocal circuit device comprising:
- a magnetic unit which receives DC magnetic field, said magnetic unit having a plurality of central conductors disposed so as to intersect with one another;
- a series resonance circuit constituted of an inductor and a capacitor, having a resonance frequency higher than the operating frequency of said nonreciprocal circuit device, connected between the ground and a port section of one of said plurality of central conductors used as an input or output port;
- and
- a terminating resistor;
- wherein
- said terminating resistor is connected to a port section of one of said plurality of central conductors which is not connected to said series resonance circuit.
3 more elements
Dependencies are inferred from the claim text.