Abstract
The manipulation of polarization state of electromagnetic waves is of great importance in many practical applications. In this paper, the reflection characteristics of a thin and dual-band metasurface are examined in the microwave frequency regime. The metasurface consists of a 22 × 22 element array of periodic unit cells. The geometry of the unit cell consists of three layers, including a 45° inclined dipole shape metal patch on top, which is backed by a 1.6 mm thick FR-4 substrate in the middle, and a fully reflective metallic mirror at the bottom. The proposed surface is exposed to horizontally (x) or vertically (y) polarized plane waves and the co and cross polarization reflection coefficients of the reflected waves are investigated experimentally in the 6–26 GHz frequency range. The metasurface is designed to convert incident waves of known polarization state (horizontal or vertical) to orthogonal polarization state (vertical and horizontal) in two distinct frequency bands, i.e. 7.1–8 GHz and 13.3–25.8 GHz. In these two frequency bands the simulated and experimental results are in good agreement. The polarization conversion ratio (PCR) of the surface is greater than 95% in the targeted frequency bands. A detailed parametric analysis of the metasurface is also discussed in this work and it has been estimated that the surface has the additional ability to convert linearly polarized waves to circularly polarized waves at several distinct frequencies. The proposed metasurface can be utilized in sensor applications, stealth technology, electromagnetic measurements, and antennas design.
Highlights
The manipulation of polarization state of electromagnetic waves is of great importance in many practical applications
A unique dipole shaped metasurface is realized in the microwave frequency regime, which gives conversion of x-polarized waves to y-polarized waves and vice versa in two distinct frequency bands
The co and cross polarization reflection coefficients are measured using two ridged broadband (18–26 GHz) horn antennas, both connected to the Agilent N5232A vector network analyzer (VNA)
Summary
The upper layer of the unit cell of the metasurface is a leaf-shaped dipole made of copper with a conductivity of 5.8 × 107S/m. The structure has been illuminated with linear (x and y) polarized plane waves by assigning a Floquet port at the top of the unit cell. For a y-polarized incident wave, the reflected waves can be expressed as Er = Exr ex + Eyr ex = Rxy exp j∅xy Eyiex + Ryy exp j∅yy Eyiey ; where Rxy = Exr Eyi and Ryy = Eyr Eyi , are the cross and co-polarized reflection coefficients, respectively. The phase angles of the co and cross polarization reflection coefficients are represented by ∅yy and ∅xy , respectively. REEeyxrifleacntdioRnxxco=effEiEcxxriie , nwtsh.eFreoarsxt-hpeolcaorrizraetsipoonnidnicnigdecnoceef,ficcrioensstsanfodr co-polarized reflection coefficients the y-polarization incident waves are are
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