Patent ID: 8525612

Claim:
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.