Wave transmission lines and networks – Coupling networks – Nonreciprocal gyromagnetic type
Reexamination Certificate
2010-02-05
2010-11-09
Jones, Stephen E (Department: 2817)
Wave transmission lines and networks
Coupling networks
Nonreciprocal gyromagnetic type
C333S001100
Reexamination Certificate
active
07830222
ABSTRACT:
A non-reciprocal circuit device capable of preventing and minimizing disturbances in magnetic field distribution in a ferrite to thereby improve insertion loss characteristics and isolation characteristics includes a ferrite to which a DC magnetic field is applied by permanent magnets and first and second center electrodes disposed on the ferrite. A conductive material is embedded in a recess provided in an end surface of the ferrite that is perpendicular or substantially perpendicular to the first and second principal surfaces of the ferrite, and the first and second center electrodes are electrically connected to the conductive material to define a circuit. Opening portions of the recess facing the first and second principal surfaces are arranged such that the opening portion at a downstream side of a direction of application of the DC magnetic field by the permanent magnets is larger than the opening portion at an upstream side thereof.
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Wada et al.; “Nonreciprocal Circuit Device”; U.S. Appl. No. 12/700,806, filed Feb. 5, 2010.
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Official Communication issued in corresponding European Patent Application No. 08828967.3, mailed on Jul. 23, 2010.
Hasegawa Takashi
Kitamori Nobumasa
Jones Stephen E
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
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