Abstract
In this work, we design a novel polarization converter based on a metasurface with double w-shaped unit cells. The proposed polarization converter can convert linearly polarized incident waves into its cross polarized reflective counterparts in a very wide band with high efficiency. Theoretical analysis and simulation results show that the proposed polarization converter can achieve a 90° polarization rotation, while the polarization conversion ratio (PCR) is above 90% in the frequency range from 8.44 GHz to 24.96 GHz, and the relative bandwidth can be up to 99%. The measured results agree well with simulation results. The designed double w-shaped metasurface has a very simple geometry, and can realize a highly-efficient and broadband polarization rotation. Therefore, it has practical applications in wireless communication systems, imaging, radar stealth technology, and other fields.
Highlights
The polarization of electromagnetic (EM) waves refers to the trace of the electric field in a plane perpendicular to the propagation direction.1 The effective control of the EM wave polarization states is important because of its potential applications in wireless communications, imaging, radar stealth technology,2–5 and so on
A four-layered polarization rotator with two pairs of L-shaped metallic patterns has been scitation.org/journal/adv proposed by Jia et al, which can realize a polarization conversion ratio higher than 90% in the frequency range of 7.8 GHz to 34.7 GHz
The simulation results show that almost all of mean polarization conversion ratio (PCR) are higher than 90% within the frequency range from 8.44 GHz to 24.96 GHz when the incident angle varies from 0○ to 50○
Summary
The polarization of electromagnetic (EM) waves refers to the trace of the electric field in a plane perpendicular to the propagation direction. The effective control of the EM wave polarization states is important because of its potential applications in wireless communications, imaging, radar stealth technology, and so on. Ye et al realized a 90○ polarization rotator by using a bilayer chiral metamaterial, which is independent on the incident polarization angle.20 The latter approach for the polarization conversion is based on the reflection (transmission) phase difference in two orthogonal polarizations. In 2014, Gao et al proposed a polarization converter based on double V-shaped metasurface, which can convert linearly polarized waves into cross-polarized waves in ultra-wideband from 12.4 GHz to 27.96 GHz.. We propose an ultra-broadband, wide-angle and highly efficient linear polarization converter based on double wshaped metasurface. It can convert a linearly polarized incident wave into its cross polarized reflective wave. Compared to the previous designs, the proposed polarization converter is very simple, and insensitive to incident angle, so it can be used for radar invisibility, conformal antennas etc
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