Abstract: In this paper, a dual-polarized antenna operating at 3.5 GHz is presented with 2D beam-scanning performance. The steerable beam is realized based on a 2×2 active reflective metasurface. The active metasurface is composed of folded annular rings and cross dipoles embedded with voltage-controlled varactor diodes. By tuning the capacitance values of the varactors, the reflective phase of the metasurface is reconfigured to tilt the main beam. To verify the scanning performance, a prototype is fabricated and measured. At 3.5 GHz, the measured scanning ranges are −25° to 29° and −27° to 29° in the XOZ plane and YOZ plane, respectively.

Keywords: dual-polarized antenna; reflective metasurface; 2D beam scanning; varactor diode