In an embodiment, an electronic device may include a first cover covering an upper portion of a main body and containing a first antenna module disposed on a lateral portion thereof, a spacer member disposed over the first cover, and a second cover disposed over the spacer member. The first and second covers may be spaced apart from each other at a predetermined distance due to the spacer member, and a separation space between the first and second covers may be configured to operate as a second antenna module. It is therefore possible to guarantee high-efficiency wireless performance having iso-directionality without compromising the design of the electronic device. Other embodiments are also possible.