Abstract
Metamaterial of dual-square array is proposed to design a dual-band circular polarizer. The novel design of asymmetric unit cell and layout of duplicate arrays significantly enhances the coupling between electric and magnetic fields. Simulation and measurement results show that the polarizer presents wide angle circular dichroism and circular birefringence. Moreover, the polarization conversion of the proposed metamaterial changes with frequency, incident angle, and polarization of incident waves. The fundamental mechanism behind is concluded to be the angle-dependent chirality and dispersion of our novel design.
Highlights
In recent years, metamaterials have been studied intensively for their special electromagnetic properties which are inexistent in natural materials
Inspired by the original multiband chiral metamaterial of twisted arc structure[24], a dual-band circular polarizer with two aligned identical square arrays of periodicity p separated by a dielectric slab of thickness h is proposed in this paper
It is well known that helical- or spiral-like structure in most prominent metamaterial-based polarizers leads to the coupling of magnetic and electric field which is one of the fundamental mechanisms behind the circular dichroism and circular birefringence
Summary
Inspired by the original multiband chiral metamaterial of twisted arc structure[24], a dual-band circular polarizer with two aligned identical square arrays of periodicity p separated by a dielectric slab of thickness h is proposed in this paper. It is well known that helical- or spiral-like structure in most prominent metamaterial-based polarizers leads to the coupling of magnetic and electric field which is one of the fundamental mechanisms behind the circular dichroism and circular birefringence. The commercial software CST microwave studio is used to simulate the linear polarization transmission matrix τ of the metamaterial. Et(r) = Eθtθ + Eφt φe−jktr is the transmitted wave through the metamaterial, kt = k0kt, kt=. The corresponding circularly polarized transmitted wave is. Where the subscripts + and − denote right- and left-handed circularly polarized waves respectively
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