The integration of millimetre-wave active phased array antenna based on vector modulation technology

To verify the feasibility of vector modulation technology in active phased array antenna (APAA), a Ka band 8×8 active phased array antenna composed of vector modulators was developed. Closed loop calibration method has been applied to achieve a good consistency among 8×8 channels by measuring and compensating the channel errors of the APAA system. The measured radiation patterns after calibration showed that the 8 ×8 APAA can steer the beam effectively, for its scanning angle of the beam can be reached between -40 degree and 40 degree with the side lobe level less than -10 dB on both E plane and H plane.