a first frame forming a first side surface of the electronic device;

a first opening formed in one area of the first frame;

a first antenna that is disposed in the electronic device to wirelessly radiate a signal toward the first opening of the first frame, wherein the first antenna includes a first printed circuit board and first conductive patches disposed on one surface of the first printed circuit board that faces the first opening;

a first dielectric material that is disposed in the first opening and has a first dielectric constant;

a second dielectric material that is disposed between the first dielectric material and the first conductive patches, wherein the second dielectric material has a second dielectric constant that is lower than the first dielectric constant of the first dielectric material; and

a wireless communication circuit electrically connected to the first antenna,

wherein the wireless communication circuit is configured to feed power to the first conductive patches to transmit and/or receive a signal in a frequency band of 10 gigahertz (GHz) or higher.