Authors: Aleksey Solovey
Source:FERMAT, Volume 22, Communication 8, Jul.-Aug., 2017
Abstract: Theoretical limitations on shielding and reflective properties of a thin layer of passive microwave magneto-dielectric metamaterial absorbers that follow solely from the boundary conditions were numerically investigated. It was found that the boundary conditions do not limit the properties of the metamaterial absorbers and the perfect, as thin as required absorber layer whose absorption level is higher than specified above certain cut-off frequency can be made by means of the magnetodielectric metamaterial. For that, all metamaterial features such as permittivity and permeability polarization and incident angle dependence, as well as lesser than one, or even negative values of real parts of permittivity and permeability must be employed. For only magnetic or only dielectric metamaterial absorbers while the transmission, reflection and total absorption levels still do not depend on the absorber thickness. However, its absorption properties start to degrade above 30º – 40º incidence due to the raise of the absorber reflectivity and then, above 75º of incidence due to the increase of transmission through the absorber approaching to 50% of total absorption at 90º incidence (evenly broken between the transmission through and reflection from the absorber).
Index Terms: Perfect absorbers, Metamaterials, Boundary conditions
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Theoretical Limitations on Shielding and Reflective Properties of Microwave Metamaterial Absorbers