Equivalent Lumped Resistance Integration for Circuit Analog Absorbers: An Alternative Approach

This paper presents a strategy for incorporating equivalent lumped resistance into the conductive layers of metamaterial absorbers. The proposed approach leverages the advantages of the two most commonly adopted techniques while circumventing their respective limitations. The validity of this method is demonstrated through a single-layer ultra-wideband design, corroborated by comparative simulation results. At 90% energy absorption level, the absorber achieves a relative bandwidth of 137.6%, with a normalized thickness of $0.102 \lambda_{\mathrm{L}}$. It is also polarization-insensitive and exhibits robustness under oblique incidence.