Patent ID: 8502619

Claim:
A circuit module comprising: a circuit board; a processing circuit provided on the circuit board and arranged to perform processing on an input signal; an isolator that is provided on the circuit board and includes an input port, an output port and a ground port, and is arranged to output the input signal that is input thereto via the input port and on which the processing circuit has performed the processing, as an output signal via the output port; and a distribution circuit that is provided between the processing circuit and the isolator, and that distributes the input signal transmitted between the processing circuit and the isolator; wherein the isolator includes: a core isolator that is mounted on the circuit board and includes a ferrite, a permanent magnet that applies a direct current magnetic field to the ferrite, a first central electrode that is provided on the ferrite, includes a first end connected to the input port and a second end connected to the output port, and a second central electrode that is provided on the ferrite so as to intersect the first central electrode while being insulated from the first central electrode and includes a first end connected to the output port and a second end connected to the ground port; and a matching circuit that is provided on the circuit board and is arranged to match an input impedance and an output impedance of the isolator to a predetermined impedance.