Stratified Layer Composite Material for Radar Anti-reflective Coating

Abstract

A composite material design that minimizes the radar reflection in S and X bands for at least two different ma-terials to be cloaked is proposed. The designed layered anti- reflective coating has tunable parameters, tailored depending on dielectric properties of the body that would be covered by it. The designed coating structure is built as a stratified sequence of parallel layers. A model accurately describing the reflection and transmission of the entire composite material stack, which includes the surface underneath to be cloaked, is developed for all angles of incidence, and for both “p” and “s” polarizations. Additionally, a generalized model, accounting for desired or unintended dielectric anisotropy of the anti-reflective coating is described. Based on the proposed model, specific practical solutions were developed separately for two surfaces - reinforced concrete, and aluminum oxide ceramic. The dielectric constants of these materials with military significance are taken as described in the literature, and the anti-reflective coating's parameters, suitable for the two specific surfaces are found.