Transparent Metasurface for Generating Microwave Vortex Beams with Cross-Polarization Conversion

In this paper, metasurfaces with both cross-polarization conversion and vortex beam-generating are proposed. The proposed finite metasurface designs are able to change the polarization of incident electromagnetic (EM) waves to its cross-polarization. In addition, they also can modulate the incidences into beams carrying orbital angular momentum (OAM) with different orders (𝑙=+1, 𝑙=+2, 𝑙=−1 and 𝑙=−2) by applying corresponding transmission phase distribution schemes on the metasurface aperture. The generated vortex beams are at 5.14 GHz. The transmission loss is lower than 0.5 dB while the co-polarization level is −10 dB compared to the cross-polarization level. The measurement results confirmed the simulation results and verified the properties of the proposed designs.

Citation: H. Shi, L. Wang, M. Zhao, J. Chen, A. Zhang and Z. Xu, "Transparent metasurface for generating microwave vortex beams with cross-polarization conversion," Materials. vol. 12, no. 11, Dec. 2018, Art. no. 2448.

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