Antenna array calibration device and method thereof

An antenna array calibration method, applied to an antenna array, wherein the antenna array is composed of a plurality of antennas, a plurality of phase shifters and a plurality of active components, each of the antennas is coupled to a corresponding phase shifter among the phase shifters and to a corresponding active component among the active components, and the antenna array calibration method comprises:

• measuring a power total of the antenna array;
• controlling the active components to adjust the antennas from having an initial amplitude to having a maximum amplitude;
• controlling the phase shifters to adjust the antennas from having an initial phase to having a random phase;
• calculating a phase difference by subtracting one of the initial phase and the random phase from the other, calculating an amplitude by subtracting one of the initial amplitude and the maximum amplitude from the other, introducing the phase difference, an amplitude difference and the power total of the antenna array into a simultaneous equation of amplitudes and phases in order to calculate whether there is a real number solution for the simultaneous equation of amplitudes and phases;
• if there is a real number solution for the simultaneous equation of amplitudes and phases, obtaining initial amplitudes and initial phases of the antennas to calibrate the phase of the antenna array;
• and
• if there is no real number solution for the simultaneous equation of amplitudes and phases, controlling the phase shifters to adjust the antennas to having another random phase different from the random phase, and recalculating the simultaneous equation of amplitudes and phases according to the other random phase in order to obtain a real number solution.