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

oleh: Hongyu Shi, Luyi Wang, Mengran Zhao, Juan Chen, Anxue Zhang, Zhuo Xu

Format: Article
Diterbitkan: MDPI AG 2018-12-01

Deskripsi

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 (<inline-formula> <math display="inline"> <semantics> <mrow> <mi>l</mi> <mo>=</mo> <mo>+</mo> <mn>1</mn> <mo>,</mo> <mi>l</mi> <mo>=</mo> <mo>+</mo> <mn>2</mn> <mo>,</mo> <mi>l</mi> <mo>=</mo> <mo>&#8722;</mo> <mn>1</mn> </mrow> </semantics> </math> </inline-formula> and <inline-formula> <math display="inline"> <semantics> <mrow> <mi>l</mi> <mo>=</mo> <mo>&#8722;</mo> <mn>2</mn> </mrow> </semantics> </math> </inline-formula>) 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 &#8722;10 dB compared to the cross-polarization level. The measurement results confirmed the simulation results and verified the properties of the proposed designs.