Abstract
AbstractA novel wideband dual‐circularly polarized orbital angular momentum (OAM) antenna array using metasurface is proposed. The proposed antenna array composed of four antenna elements generates OAM beams in a simple configuration. Each antenna element is placed perpendicularly to the adjacent one, and fed by an in‐phase excitation with equal amplitude. Each antenna element is based on corner‐truncated polarization‐rotation metasurface (PRMS) cells and excited by a dual‐feeding structure through a cross‐like slot, which can realize wideband dual circular polarization (RHCP, LHCP). The proposed antenna array produces dual‐mode OAM mode waves (l = ±1) and exhibits good dual‐circularly polarized performances in a low profile of 0.068 λ0. The measured results show wide impedance bandwidths of 30% for LHCP and 26.6% for RGCP. Also, the large axial ratio bandwidths ARBWs of the OAM antenna array are 20% for LHCP and 14% for RHCP.
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