An electronic device may include a first PCB including a non-conductive region and a conductive region operating as a ground, a first wireless communication circuit disposed on the first PCB, and a 5th generation (5G) antenna module disposed adjacent to the first PCB. The 5G antenna module may include at least one second PCB including an antenna array and a conductive layer operating as a ground of the antenna array and a second wireless communication circuit electrically connected to the antenna array. The second PCB may include a first portion and a second portion having a predetermined angle with the first portion. The first portion may be disposed adjacent to the non-conductive region and at least part of the second portion may be disposed adjacent to the conductive region. The first wireless communication circuit may be electrically connected to a first point of the conductive layer included in the first portion and transmitting or receiving a first RF signal in a first frequency band by using the conductive region and at least part of the conductive layer. The second wireless communication circuit may transmit or receive a second RF signal in a second frequency band by using the antenna array. Besides, various embodiments as understood from the specification are also possible.