Metamaterial Based Anisotropic Metasurface for Broadband Cross Polarization Conversion

Abstract

This paper presents ultra-wideband polarization conversion metasurface(MS) in microwave regime. Metasurfaces with two different types of unit cells have been designed and simulated. Metasurface MS <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> consisting of two-dimensional Rectangular split-ring-resonators(SRRs) and MS <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> consisting of two-dimensional circular SRRs. Both the metasurfaces are etched on top of a FR4 dielectric substrate having ground with a metallic covering. The proposed metasurfaces have wide polarization conversion bandwidth due to multiple plasmon resonances. MS <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> converts an linearly polarized wave into its corresponding orthogonal polarization while MS <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> converts both linear and circular polarization waves into their corresponding orthogonal polarizations. It is also observed that MS <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> is more compact and achieves wide bandwidth than MS <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> . The proposed metasurface would be promising in applications for polarization control devices.