An electronic device according to an embodiment of the disclosure may include a first heat dissipating plate that is made of a metallic material and includes a first antenna including a first opening extending in a first direction and a second opening extending in a second direction and connected to the first opening, a first printed circuit board disposed on the first heat dissipating plate and including a feeding part that overlaps with at least a part of the first opening and the second opening, is made of a metallic material, and is electrically connected to the communication module of the electronic device, and a heat dissipating fin made of a metallic material and disposed on the first heat dissipating plate in a direction perpendicular to the first direction and the second direction.