Isolator

An isolator, comprising:

• a substrate;
• a first planar coil provided above the substrate, the first planar coil being provided along a surface of the substrate;
• a first insulating portion provided on the first planar coil;
• a second planar coil provided on the first insulating portion;
• and
• a metal layer provided above the first insulating portion,
• the first planar coil, the second planar coil, and the metal layer being arranged in a first direction perpendicular to the surface of the substrate,
• the first planar coil and the second planar coil each having a center and an outer perimeter in a second direction along the surface of the substrate, a distance in the second direction from the center of the first planar coil to the outer perimeter of the first planar coil being less than a distance in the second direction from the center of the second planar coil to the outer perimeter of the second planar coil,
• the metal layer having a center and an outer perimeter in the second direction,
• the second planar coil having an inner perimeter in the second direction,
• a distance in the second direction from the center of the metal layer to the outer perimeter of the metal layer being less than a distance in the second direction from the center of the second planar coil to the inner perimeter of the second planar coil, and
• the second planar coil and the metal layer including portions facing each other in the second direction.

An isolator, comprising:

• a substrate;
• a first planar coil provided above the substrate, the first planar coil being provided along a surface of the substrate;
• a first insulating portion provided on the first planar coil;
• a second planar coil provided on the first insulating portion;
• and
• a metal layer provided above the first insulating portion and the second planar coil,
• the first planar coil, the second planar coil, and the metal layer being arranged in a first direction perpendicular to the surface of the substrate,
• the second planar coil and the metal layer each having a center and an outer perimeter in a second direction along the surface of the substrate,
• a distance in the second direction from the center of the metal layer to the outer perimeter of the metal layer being greater than a distance in the second direction from the center of the second planar coil to the outer perimeter of the second planar coil.