A Broadband Metamaterial Absorber Based on Dual-layered Resistive Square Ring Arrays Structure

In this paper, a novel broadband metamaterial absorber structure based on dual-layered resistive square rings (RSRs) arrays with compound periodic lattices was proposed and demonstrated. The periodic lattices of upper and lower layer arrays were specifically designed so that they can absorb incident electromagnetic (EM) wave at different frequencies, respectively. Equivalent circuit model and full-wave electromagnetic simulation were used to analyze and optimize this absorber. Abroad combined absorption band was obtained by fine tuning the structure parameters of RSRs in different layers. The prototype of optimized absorber structure was fabricated and measured. Both the theoretical and experimental results indicated that this absorber has low reflectivity of ≤−10dB from 3.9 to 29.7 GHz at normal incidence.