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       As an important part of radar, the active phased array antenna has made great progress in recent years. Therefore, in addition to the basic test of the receiving and transmitting pattern, the test of the phased array antenna also needs a series of indexes that the traditional antenna does not have, such as beam jump, beam pointing accuracy, beam scanning decline, beam scanning width, EIRP, g / T, power consumption, phase center, etc  Test, the far-field test system can fully test it.