The present invention provides a back cover for a portable terminal formed of a metal material and disposed on a back surface of a portable terminal main body including a pattern portion configured to reduce generation of an eddy current and formed to pass through a region corresponding to at least one antenna, which is disposed in one surface of the back cover and operates at a predetermined frequency band.

The pattern portion may include at least one of a linear shape having a predetermined length and a through hole having a predetermined area.

Patterns close to each other may be formed to be disconnected from each other.

Each of the patterns may include a protection material filled therein.

The protection material may be formed of a nonconductive and nonmagnetic material.

As another example, the pattern portion may include a through port formed to pass through a predetermined area including the area corresponding to the antenna, a mesh body formed of a metal material and disposed in the through port, and a protection layer filled in the through port and configured to connect the mesh body and the back cover. A plurality of weft threads and a plurality of warp threads disposed to form a plurality of through holes may be electrically insulated from each other in the mesh body.

An accommodation groove may be formed in an inner surface of the back cover to be recessed to accommodate an overall thickness or some of a thickness of the antenna.

The pattern portion may be formed to pass through a bottom surface of the accommodation groove.

The back cover may be formed of a metal material including at least one of copper, aluminum, gold, and silver.