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. 2015 Jul 23:5:12476.
doi: 10.1038/srep12476.

Ultra Wideband Polarization-Selective Conversions of Electromagnetic Waves by Metasurface under Large-Range Incident Angles

Jia Yuan Yin  1 , Xiang Wan  1 , Qian Zhang  1 , Tie Jun Cui  2
Affiliations
Free PMC article

Ultra Wideband Polarization-Selective Conversions of Electromagnetic Waves by Metasurface under Large-Range Incident Angles

Jia Yuan Yin et al. Sci Rep. .
Free PMC article

Abstract

We propose an ultra-wideband polarization-conversion metasurface with polarization selective and incident-angle insensitive characteristics using anchor-shaped units through multiple resonances. The broadband characteristic is optimized by the genetic optimization algorithm, from which the anchor-shaped unit cell generates five resonances, resulting in expansion of the operating frequency range. Owing to the structural feature of the proposed metasurface, only x- and y-polarized incident waves can reach high-efficiency polarization conversions, realizing the polarization-selective property. The proposed metasurface is also insensitive to the angle of incident waves, which indicates a promising future in modern communication systems. We fabricate and measure the proposed metasurface, and both the simulated and measured results show ultra-wide bandwidth for the x- and y-polarized incident waves.

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Conflict of interest statement

The authors declare no competing financial interests.

Figures

Figure 1
Figure 1. Schematic of the anchor-shaped unit cell.
(a) The yellow parts are metal (modeled as copper) and the grey part is the 3mm-thick substrate. (b) Specific illustration of the anchor-shaped unit cell, in which O1and O2bear a distance of 0.6 mm along the v-axis. The angle of the transformed V-shaped resonator is θ, which is not labeled in the figure. (This figure was drawn by Jia Yuan Yin)
Figure 2
Figure 2. Current distributions at corresponding resonances.
(a) V-polarized case. (b) U-polarized case.
Figure 3
Figure 3. Resonant eigen-modes of the anchor-shaped unit cell under the normal incidence.
(a) 9 GHz. (b) 19.6 GHz. (c) 22.3 GHz. (d) 6.6 GHz. (e) 16 GHz. (f) 22.3 GHz.
Figure 4
Figure 4. Decomposition of electric vectors of incident and reflected EM waves on z = 0 plane
.
Figure 5
Figure 5. Simulated results of the proposed anchor-shaped unit cell.
(a) The co- and cross-polarized reflection coefficients. (b) The polarization conversion ratio.
Figure 6
Figure 6. The simulated results for different heights of the substrate.
(a) Co-polarization reflection coefficients. (b) Cross-polarization reflection coefficients.
Figure 7
Figure 7. The simulated results for different incident angles.
(a) Co-polarization reflection coefficients. (b) Cross-polarization reflection coefficients.
Figure 8
Figure 8. The simulated results for differently polarized incident waves.
(a) Co-polarization reflection coefficients. (b) Cross-polarization reflection coefficients.
Figure 9
Figure 9. The measurement setup and measured results.
(a) The experimental platform constructed for measurement. (b) The measured co- and cross-polarized reflection coefficients.
Figure 10
Figure 10. The normalized far-field patterns of the proposed structure, in which the red lines signify the results when using the anchor-shaped structure, while the black lines illustrate the results when using the whole piece of metal as comparison.
(a) 6 GHz. (b) 10 GHz. (c) 14 GHz. (d) 18 GHz.
Figure 11
Figure 11
Figure 12
Figure 12
See this image and copyright information in PMC

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