Provided are an antenna device and an electronic device including the same. The antenna device includes a dielectric substrate formed of a transparent material, a mesh grid comprising conducting wires formed on at least one of the plurality of surfaces of the dielectric substrate, a first portion of the mesh grid having a radiation conductor formed by a first plurality of the conducting wires, and a second portion of the mesh grid having a dummy pattern formed by a second plurality of conducting wires, in which the dummy pattern includes at least one discontinuous portions in which portions of the second conducting wires are opened to electrically open the first portion forming the radiation conductor from the mesh grid less the first portion, and the first conducting wires are formed to have a line width that is different from a line width of the second conducting wires.