Disclosed in an electronic device, which includes a housing that includes a first plate and a second plate facing a direction opposite the first plate, a conductive plate that is disposed in a first plane between the first plate and the second plate, and is parallel to the second plate, a wireless communication circuit that is disposed within the housing and is configured to transmit and/or receive a signal having a frequency ranging from 20 GHz to 100 GHz, a first electrical path having a first end electrically connected with the wireless communication circuit and a second end floated, the first electrical path including a first portion between the first end and the second end, a second electrical path having a third end electrically connected with the conductive plate and a fourth end floated, the second electrical path including a second portion between the third end and the fourth end.