Patent ID: 6876269
Filing Date: 2005-04-05
Classification: H01P

Abstract:
1. A nonreciprocal circuit element comprising: a magnetic assembly comprising a ferrite magnetic body, a common electrode disposed on one surface of the magnetic body, and three central conductors extending in three directions from a periphery of the common electrode and disposed on the magnetic body; capacitors connecting to the respective central conductors; a permanent magnet which applies a DC bias magnetic field to the magnetic body; and a metal case which accommodates the magnetic assembly, the capacitors, and the permanent magnet, the metal case functioning as a magnetic yoke, wherein a saturation magnetic flux density of at least a portion of the metal case and a residual magnetic flux density of the permanent magnet have negative temperature coefficients, and the portion of the metal case comprises a magnetic material having a larger absolute value of the temperature coefficient of the saturation magnetic flux density than an absolute value of the temperature coefficient of the residual magnetic flux density of the permanent magnet in a temperature range of −35° C. to +85° C.