The above-described antennas 121, 122, and 123 may be attached to one surface of each of the back covers for the portable terminals 110, 210, 310, and 410 through an adhesive member 126. In this case, a liquid type or gel type adhesive may be used as the adhesive member 126, and the adhesive member 126 may be a type in which an adhesive is formed on one surface or both surfaces of a base material. Here, the adhesive may include a nonconductive ingredient to block electric connection between the antennas 121, 122, and 123, and the back covers for the portable terminals 110, 210, 310, and 410.

The magnetic field shielding sheet 130 is formed of a magnetic material and serves as to focus the magnetic field generated from the antennas 121, 122, and 123 in a predetermined direction by shielding the magnetic field. The magnetic field shielding sheet 130 may be attached to the inside of each of the back covers for the portable terminals 110, 210, 310, and 410 to cover one surface of each of the antennas 121, 122, and 123.

The above-described magnetic field shielding sheet 130 may be formed of the various known materials. For example, a ribbon sheet including at least one of an amorphous alloy and a nanocrystalline alloy, a ferrite sheet, a polymer sheet, or the like may be used as the magnetic field shielding sheet 130.

Further, the magnetic field shielding sheet 130 may be flaked to form a plurality of pieces, and may be formed in multiple layers.