US 8,525,612 B2Granted

Circuit module

AssigneeMurata Manufacturing Co., Ltd.

InventorKoji Furutani

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Abstract

A circuit module having reduced magnetic coupling between core isolators. A substrate body includes principal surfaces. A core isolator includes a ferrite, a permanent magnet that applies a DC magnetic field to the ferrite, a first center electrode provided for the ferrite and including one end connected to an input port and another end connected to an output port, and a second center electrode provided for the ferrite so as to intersect the first center electrode insulated from the second center electrode and that includes one end connected to the output port and another end connected to a ground port. The core isolator also includes no yokes preventing leakage of the DC magnetic field to the outside. The core isolators are mounted on the respective principal surfaces such that directions of the DC magnetic fields are parallel or substantially parallel to the principal surface.

Claims9

Dependent claims

A circuit module comprising:

a multilayer body including a plurality of insulating layers stacked on top of one another;
and
first and second core isolators each including:
a ferrite;
a permanent magnet that applies a direct-current magnetic field to the ferrite;
a first center electrode provided for the ferrite, the first center electrode having one end thereof connected to an input port and the other end thereof connected to an output port;
and
a second center electrode provided for the ferrite and arranged to intersect the first center electrode while being insulated therefrom, the second center electrode having one end thereof connected to the output port and the other end thereof connected to a ground port;
the first and second core isolators having no yokes preventing leakage of the direct-current magnetic field to outside;
wherein
each of the first and second core isolators is mounted on a different one of the insulating layers such that a direction of the direct-current magnetic field is parallel or substantially parallel to a principal surface of the insulating layers.

8 more elements

Dependencies are inferred from the claim text.