Development and optimization of a planar wideband ultrathin absorber based on equivalent circuit model analysis

Grounded ultrathin single layer absorbers are studied in detail in this paper under normal incidence. The analysis proposed aims to model the theory of near unity absorption using non-rigorous equations. In addition to implementing the near perfect design perspectives for ultrathin absorbers using non-complicated structures. The analysis results show that planar patch absorber structure can be adapted to generate multiple adjacent resonances providing a wider bandwidth. Furthermore, fabricated prototypes have been measured for model validation and calculations verification. The agreement between the analytical calculations, simulations results, and measurements has demonstrated the efficiency of the proposed analysis technique and design methodology. Different absorbers’ configurations available in literature are summarized in comparison to the work presented in this paper.