Abstract: Based on the measured radiation pattern data of the antenna, a ralationship between phase offset and positional deviation of the phase center is founded by means of changing the reference point. Using the least square method, we can compute the phase center deviation for the antenna.Finally, a suit of test system is developed.The measured result and the error analysis indicate that the proposed method can accurately measure the phase center of the antenna,with the measuring accuracy less than 1mm.

Key words: antenna phase center, phase offset, positional deviation, accurate measurement