Efficient generation of a dual-polarized vortex wave with an ultrathin Huygens' metasurface

In this paper, an ultrathin Huygens' metasurface is designed for generating an orbital angular momentum (OAM) beam. The Huygens' metasurface is a double-layered metallic structure on a single-layer PCB. Based on induced magnetism, the Huygens' metasurface achieves the abilities of available near-complete transmission phase shift around 28 GHz. According to the principle of vortex wave generation, a Huygens' metasurface is designed, implemented and measured. The simulated and measured results show that the dual-polarized OAM transmitted waves with the mode l = 1 can be efficiently generated on a double-layered Huygens' metasurface around 28 GHz. The measured peak gain is 23.4 dBi at 28 GHz, and the divergence angle is 3.5 degrees. Compared with conventional configurations of OAM transmitted beam generation, this configuration has the advantages of high gain, narrow divergence angle, and low assembly cost. This investigation will provide a new perspective for engineering application of OAM beams.

Automated summary

An ultrathin Huygens' metasurface is designed to generate an orbital angular momentum (OAM) beam. The metasurface achieves near-complete transmission phase shift around 28 GHz based on induced magnetism. Experimental results show that dual-polarized OAM transmitted waves with mode l = 1 can be efficiently generated on a double-layered Huygens' metasurface around 28 GHz, with high gain, narrow divergence angle, and low assembly cost.