A calibration method for a phased array system comprises sequentially injecting a tone into a first plurality of antenna elements of an antenna array, receiving the tone by a second plurality of antenna elements of the antenna array through parasitic coupling between the first plurality of antenna elements and the second plurality of antenna elements, measuring a plurality of phase errors between the first plurality of antenna elements and the second plurality of antenna elements, populating a lookup table with the plurality of phase errors, and calibrating a plurality of phase shifters associated with a plurality of channels in the phased array system using the plurality of phase errors in the lookup table.