Phase-control array antenna module capable of supressing grating lobe gain and phase-shift control method thereof

Abstract

The present disclosure relates to a phase-control array antenna module capable of suppressing grating lobe gain. The phase-control array antenna module includes an array antenna and a beam steering unit. The array antenna includes a plurality of sub-antennas. Each sub-antenna includes at least one antenna unit. The sub-antennas of any two adjacent rows or columns are staggered in the first direction. The beam steering unit outputs and receives a plurality of RF signals through the plurality of sub-antennas. A phase-shift unit angle is formed between any two adjacent RF signals in the azimuth direction and changes in related to a steering angle of a beam according to a microwave radiation pattern of the array antenna in the azimuth direction. A compensation angle is defined between any two corresponding RF signals in an elevation direction and from the two adjacent sub-antennas with and without staggering. In the first phase-shift unit angle interval, the compensation angle is a first compensation angle; and in the second phase-shift unit angle interval, the compensation angle is a second compensation angle.