Magnetic coupling coil element

A coil element, comprising:

• an insulator body including a plurality of first insulating layers and a plurality of second insulating layers laminated in a stacking direction;
• a plurality of first conductive patterns formed on the plurality of first insulating layers;
• a plurality of second conductive patterns formed on the plurality of second insulating layers;
• a first external electrode electrically connected to a first end portion of a first coil unit, the first coil unit including the plurality of first conductive patterns;
• and
• a second external electrode electrically connected to a second end portion of the first coil unit,
• wherein the insulator body includes a first end region situated at a top in the stacking direction, a second end region situated at a bottom in the stacking direction, and an intermediate region situated between the first end region and the second end region,
• wherein the first end region includes one or more of the plurality of first insulating layers only such that the first end region includes two or more of the plurality of first conductive patterns only among the plurality of first conductive patterns and the plurality of second conductive patterns,
• wherein the second end region includes one or more of the plurality of second insulating layers only such that the second end region includes two or more of the plurality of second conductive patterns only among the plurality of first conductive patterns and the plurality of second conductive patterns,
• wherein the intermediate region includes other two or more of the plurality of first insulating layers and other two or more of the plurality of second insulating layers, each of the other two or more of the plurality of first insulating layers and each of the other two or more of the plurality of second insulating layers arranged alternately in the stacking direction,
• wherein the insulator body includes a first portion and a second portion that is an area other than the first portion, the first portion arranged not to cover upper surfaces of the two or more of the plurality of first conductive patterns in the first end region,
• wherein an electrical resistivity of the first portion is higher than an electrical resistivity of the second portion,
• wherein the plurality of second conductive patterns in the intermediate region includes an upper edge conductive pattern disposed between a top one of the plurality of first conductive patterns in the intermediate region and a bottom one of the plurality of first conductive patterns in the first end region,
• wherein the plurality of first conductive patterns in the intermediate region includes a lower edge conductive pattern disposed between a bottom one of the plurality of second conductive patterns in the intermediate region and a top one of the plurality of second conductive patterns in the second end region,
• wherein the first portion is provided so as to cover (i) upper and lower surfaces of the upper edge conductive pattern and (ii) upper and lower surfaces of the lower edge conductive pattern, and
• wherein the first portion is provided so as not to cover (i) upper and lower surfaces of one or more of the plurality of second conductive patterns in the intermediate region other than the upper edge conductive pattern and (ii) upper and lower surfaces of one or more of the plurality of first conductive patterns in the intermediate region other than the lower edge conductive pattern.