Opimization of Material Parameters for Maximum Electromagnetic Absorption

In this study, the effects of the complex relative permittivity and thickness of a material placed on a Perfect Electric Conductor (PEC) ground plane on its electromagnetic (EM) absorption performance are investigated, and a method is proposed to identify the parameter values that provide maximum electromagnetic absorption. Initially, the thickness value that maximizes absorption within the material's operating frequency range is determined. Next, with the thickness value kept constant, the study identifies the complex relative permittivity that leads to maximum absorption. Finally, in the absence of constraints, the study analytically determines the optimal combination of the complex relative permittivity and material thickness that results in maximum absorption. The parameters obtained in each section are then numerically validated between 9.5 GHz and 10.5 GHz using both electromagnetic simulations and optimization tools.