Compared to relatively low-frequency antennas, mmWave phased array antennas have a narrower beam width and shorter wave lengths, so their sampling resolution would be much higher. Meanwhile, an active phased-array-antenna usually has multiple test ports and multiple beam pointing status (each status represents an antenna pattern in the main lobe direction). It is necessary to test multiple-beam pointing status (beam position). These will dramatically increase the total testing time for a single antenna array. With the conventional test method, an engineer must test every status for each port one by one, and as a result, the test efficiency is quite low. For example, a 10×10 antenna array can be tested in one week.