극초음속 플라즈마 환경에서의 통신두절 극복을 위한 메타물질 구현

Abstract

Communication blackout of hypersonic flights refers to an interruption in communication when a flight enters an extreme environment of atmospheric gas ionization. Specifically, as the ionized gas and electron density goes over the plasma density, the gas medium becomes conductive, where the conductivity can be translated into a permittivity with a negative real number. The resulting class of material can be characterized as an ENG (Epsilon-Negative) material, which induces a significant decaying constant and absorbs or reflects most of the electromagnetic waves, even within an ultrathin layer. In this study, we propose MNG (Mu-Negative) metamaterials that achieve complete transmission through the layering of the MNG material after the plasmonic layer. Moreover, we calculated the transmittance and reflectance of multilayers as a function of incident angle and frequency to prove that transmittance can be improved by x4 larger with the MNG material in aerospace conditions. This study is the result of theoretical analysis proving the usefulness of MNG metamaterials and can be regarded as a fundamental study that can be applied in the development of MNG metamaterials or real-life applications.