An antenna assembly includes a first layer realized as a dielectric substrate formed of a transparent dielectric material, and a second layer formed in a metal mesh shape on one surface of the dielectric substrate. The second layer includes a metal mesh radiator region configured with metal lines that realize an atypical mesh shape having a specific line-width or smaller in such a manner as to transmit and receive a wireless signal and an open area, and a dummy metal mesh region configured with metal lines and slits that realize an atypical mesh shape having a specific line-width or smaller.