The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as long term evolution (LTE). According to various embodiments, an antenna apparatus may include: an array antenna including a sub-array, a power divider, and a reconfigurable phase shifter circuit, the reconfigurable phase shifter circuit may be configured to provide a first phase shift value based on a switch in a first state, and provide a second phase shift value different from the first phase shift value based on the switch in a second state.