Decoupling Analysis of Structural Parameters in the Robust Design of Metamaterial Absorber

Metamaterials have attracted enormous interest in the perfect absorber. In sharp contrast to most previous studies focused on improving absorption coefficient and expanding absorption bandwidth, this article presents an optimal design approach that enhances the robustness of absorption bandwidth to several hard-to-control variables. The split ring resonator (SRR) was used as an optimizable object to illustrate this approach. Unlike the traditional design method for metamaterial absorbers, which pays attention to the construction of equivalent circuit models and the effect of lumped parameters on the performance index, this article uses the decoupling analysis to establish the mapping between structural parameters and the performance index. The concept of factor effect and interaction effect is introduced to describe the decoupling analysis, and the impact of each factor on the signal-to-noise ratio (SNR) of absorption bandwidth is analyzed. Compared to the original design, the robustness of the optimal design is improved. The predicted result obtained by decoupling analysis and the simulated result shows a good agreement.