Broadband Circuit Analog Absorber Based on Multilayer Graphene-loaded Metasurface

In this paper, a broadband circuit analog absorber using multilayer and multi-resonant graphene-loaded metasurface is proposed. The absorber consists of two graphene-loaded square metallic loops and a metal plate. Two lossy layers are adopted to broaden the absorption band. The absorption band with −10 dB reflection is 1.2–12.6 GHz, with a fractional bandwidth of 165%. Two Layers are supported by foams, making the structure more stable. The thickness of the structure is only
$0.098 \lambda_{L}$
, where
$\lambda_{L}$
is the wavelength at the lowest frequency. The absorber is polarization insensitive due to its symmetrical structure. Moreover, it has good stability under oblique incident angles.