Research on 2D beam scanning liquid crystal reflective array based on subarray division at K-band

This paper designs a K-band two-dimensional beam scanning liquid crystal reflective array based on sub-array division. The phase shifting unit adopts a "工"-shaped dipole structure, and a new sub-array division arrangement is adopted, by dividing the 24×24 liquid crystal reflective array into three parts, namely, the smallest phase shifting unit, 2×2 sub-array unit, and 3×3 sub-array unit, reducing the number of feedlines and achieving two-dimensional beam scanning. Simulation results show that the 24×24 reflective array designed in this paper, with the new sub-array division arrangement in the Kband, achieves a ±40° beam scanning in the E plane and H plane, and the array gain can maintain above 20dBi, with good directionality and side lobe levels below -5dB.