Abstract

The efficient generation of dual-polarized orbital angular momentum (OAM) beam is reported based on an ultrathin Huygens' metasurface. The simulation results show that the dual-polarized vortex wave with <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{l=1}$</tex> mode can be generated efficiently on a double-layer metallic structure at 28 GHz with a narrow divergence angle of about <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\pm 4^{\mathrm{o}}$</tex> . Moreover, this metasurface has additional advantages of high gain and low assembly cost. A new perspective for OAM vortex antennas is exhibited by this work.

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