Abstract: An electronic device including a first body and a second body is disclosed. The first body includes a first system circuit board, a first grounding element, and a primary antenna. The first grounding element is disposed on the first system circuit board. The primary antenna is disposed on the first system circuit board and electrically connected to the first grounding element. The primary antenna transmits/receives at least one radio frequency (RF) signal. The second body includes a second system circuit board and a clearance area. The clearance area is on the second system circuit board, and no circuit exists in the clearance area. When the first body and the second body are stacked by parallelizing the first system circuit board and the second system circuit board, the clearance area is corresponding to the primary antenna.