Coil component

1. A coil component comprising:

a support substrate;

a coil portion disposed on the support substrate;

a body, in which the support substrate and the coil portion are disposed, having one surface and another surface opposing each other in a direction, and a plurality of side surfaces connecting the one surface and the other surface to each other; and

external electrodes disposed only on the one surface of the body and spaced apart from the plurality of side surfaces of the body, the external electrodes being separated from the support substrate by through vias disposed between the support substrate and the external electrodes,

wherein the coil portion comprises a coil pattern portion disposed on a first surface of the support substrate, a lower pattern portion connected to the coil pattern portion and disposed on the first surface of the support substrate, a dummy pattern portion disposed on a second surface of the support substrate opposite to the first surface to overlap the lower pattern portion through the support substrate, and a through-via penetrating through the support substrate and connecting the lower pattern portion and the dummy pattern portion to each other,

the lower pattern portion and the dummy pattern portion are externally exposed through the one surface of the body,

the through-via has one surface externally exposed through the one surface of the body, and

the support substrate is spaced apart from the one surface of the body in the direction.

2. The coil component of claim 1 , wherein the one surface of the through-via is disposed on a same plane as the one surface of the body.

3. The coil component of claim 1 , wherein the support substrate is not exposed to the one surface of the body.

4. The coil component of claim 1 , wherein the coil portion includes first and second coil portions, respectively disposed on the first surface and the second surface of the support substrate,

the first coil portion comprises the lower pattern portion and a second dummy pattern portion disposed on the first surface of the support substrate to be spaced apart from each other,

the second coil portion comprises a second lower pattern portion and the dummy pattern portion disposed on the second surface of the support substrate to be spaced apart from each other, and

the second lower pattern portion and the second dummy pattern portion are disposed to overlap each other on the opposite first and second surfaces of the support substrate.

5. The coil component of claim 4 , wherein the support substrate comprises a first support portion, supporting the lower pattern portion and the dummy pattern portion, and a second support portion supporting the second lower pattern portion and the second dummy pattern portion.

6. The coil component of claim 5 , wherein the through-via comprises a first through-via, penetrating through the first support portion and connecting the lower pattern portion and the dummy pattern portion to each other, and a second through-via penetrating through the second support portion and connecting the second lower pattern portion and the second dummy pattern portion to each other.

7. The coil component of claim 6 , wherein the first through-via is externally exposed through the one surface of the body, and the first support portion is spaced apart from the one surface of the body by the first through-via, and

the second through-via is externally exposed through the one surface of the body, and the second support portion is spaced apart from the one surface of the body by the second through-via.

8. The coil component of claim 6 , wherein one surface of the first through-via is disposed on a same plane as the one surface of the body, and

one surface of the second through-via is disposed on the same plane as the one surface of the body.

9. The coil component of claim 5 , wherein the through-via comprises a first through-via having an external surface, exposed through the one surface of the body, and an internal surface opposing the external surface and in contact with the lower pattern portion, the first support portion, and the dummy pattern portion, and a second through-via having an external surface, exposed through the one surface of the body, and an internal surface opposing the external surface and in contact with the second lower pattern portion, the second support portion, and the second dummy pattern portion.

10. The coil component of claim 5 , wherein the first and second coil portions further comprise a first connection portion, connecting an end portion of the coil pattern portion and the lower pattern portion to each other, and a second connection portion connecting an end portion of a second coil pattern portion disposed on the second surface of the support substrate and the second lower pattern portion to each other.

11. The coil component of claim 10 , wherein the first and second coil pattern portions each have a plurality of coil turns having a constant line width extending to respective end portions thereof,

each of the lower pattern portion and the second lower pattern portion extends below a center of the body in a thickness direction, and

a line width of one end of each respective one of the first and second connection portions, connected to an end portion of a respective one of the first and second coil patterns, is smaller than a line width of the other end of the respective one of the first and second connection portions connected to an end portion of a respective one of the lower pattern portion and the second lower pattern portion.

12. The coil component of claim 10 , wherein the first connection portion has a first connection via penetrating through the coil pattern portion and the first support portion, and

the second connection portion has a second connection via penetrating through the second coil pattern portion and the second support portion.

13. The coil portion of claim 12 , wherein the through-via has a diameter smaller than diameters of the first and second connection vias.

14. The coil component of claim 1 , further comprising:

an external electrode covering the through-via.