An electronic device according to certain embodiments may comprise: a first circuit board; a second circuit board including a communication module; a first antenna module spaced apart from the communication module; a flexible cable including a first connector connected to the first circuit board, a second connector connected to the first antenna module, a first extension unit extending between the first connector and the second connector, and a first receptacle positioned on the first extension unit; and a first coaxial cable including a third connector connected to the communication module, a fourth connector connected to the first receptacle, and a second extension unit extending between the third connector and the fourth connector.