An electronic device is provided. The electronic device includes an antenna array including a plurality of elements arranged to perform beamforming, wherein a first number corresponds to a total number of the plurality of elements, a processor operatively connected to the antenna array, and a memory, wherein the memory stores instructions that, when executed, cause the processor to identify a second number of the plurality of elements that are performing the beamforming, determine a first backoff value stored based on the second number, and perform a power backoff operation according to the first backoff value.