Investigation of the microwave chiral metamaterial based on a uniform set of C-shaped conductive inclusions

Abstract

The paper considers an artificial chiral metamaterial created on a homogeneous container basefrom foamed dielectric, in which flat conducting S-shaped microelements are evenly placed and arbitrarily oriented. To describe the metamaterial, a particular mathematical model was constructed that takes into account chirality, dispersion, and heterogeneity of the structure. The Maxwell Garnett model was used to account for heterogeneity. To take into account the dispersion of the chirality parameter, the Condon model known from the theory of optically active media was used. The partial domain method was used to solve the problem of the incidence of a plane electromagnetic wave of linear polarization on a planar layer created on the base of the investigated chiral metamaterial. The solution of the problem was reduced to an inhomogeneous system of linear algebraic equations for unknown reflection and transmission coefficients, taking into account the cross-polarization of the electromagnetic field. An analysis of the numerical results showed that the structure has pronounced frequency selective properties, in particular, as in the case of chiral metamaterial based on three-dimensional conductive elements, discrete frequencies were determined at which the structure is transparent to microwave radiation. Chiral metamaterial based on C-shaped microelements can be used to create narrow-band frequency-selective microwave energy concentrators of planar type.