Generation and deflection of dual-frequency two-dimensional microwave Airy beams on the basis of compact meta-atoms

Airy beams have attracted much attention because of their nondiffraction, self-healing, and self-bending properties. However, the existing methods suffer from a single operating frequency and a fixed radiation direction. In this paper, a single-layer hexagonal transmissive meta-atom is proposed, which enables completely independent modulation of the amplitude and phase at dual frequencies. The compact structure has high transmittance and enables precise control of the amplitude and phase at two frequencies. As a proof-of-concept, the proposed meta-atom is applied to generate microwave two-dimensional Airy beams deflected ± 20° at 10 GHz and 16 GHz. The simulation results prove that the deflected Airy beams still maintain self-accelerating and self-healing properties.