Nonreciprocal circuit element, manufacturing method of the same, and communication apparatus using the same

A communication apparatus including a nonreciprocal circuit element, the nonreciprocal circuit element comprising:

• a magnetic rotator disposed between first and second ground conductors;
• and
• a first permanent magnet that applies a DC magnetic field to the magnetic rotator,
• wherein the magnetic rotator includes:
• a first ferrite core having a first surface covered with the first ground conductor;
• a second ferrite core having a second surface covered with the second ground conductor;
• a first center conductor directly fixed to a third surface of the first ferrite core positioned opposite to the first surface;
• and
• a second center conductor directly fixed to a fourth surface of the second ferrite core positioned opposite to the second surface, and
• wherein the first ground conductor is arranged between the magnetic rotator and the first permanent magnet.

A nonreciprocal circuit element comprising:

• a first ferrite core having first and second surfaces opposite to each other;
• a second ferrite core having third and fourth surfaces opposite to each other;
• an adhesive that that bonds the first and second ferrite cores together such that the first surface of the first ferrite core and the third surface of the second ferrite core face each other;
• a first center conductor formed on the first surface of the first ferrite core such that there is no gap or the adhesive between the first surface of the first ferrite core and the first center conductor;
• a second center conductor formed on the third surface of the second ferrite core such that there is no gap or the adhesive between the third surface of the second ferrite core and the second center conductor;
• and
• a first permanent magnet covering the second surface of the first ferrite core.

A method of manufacturing a nonreciprocal circuit element, the method comprising:

• forming a first ground conductor directly on a first surface of a first ferrite core;
• forming a first center conductor directly on a second surface of the first ferrite core positioned opposite to the first surface;
• forming a second ground conductor directly on a third surface of a second ferrite core;
• forming a second center conductor directly on a fourth surface of the second ferrite core positioned opposite to the third surface;
• fixing the first and second ferrite cores such that the second surface of the first ferrite core and the fourth surface of the second ferrite core face each other;
• and
• disposing a permanent magnet that applies a DC magnetic field to the first and second ferrite cores such that the first ground conductor is arranged between the magnetic rotator and the permanent magnet.