Design of a triple‐band metamaterial absorber using equivalent circuit model and interference theory

Abstract

AbstractIn this letter, an ultra‐thin triple‐band metamaterial absorber with high absorptivity in each band of operation is presented. The unit cell of the proposed structure consists of an outer circular metal ring and an inner Jerusalem cross on top of a thin dielectric substrate backed by metallic ground plate. Simulation responses exhibit that the proposed absorber is polarization insensitive and has a stable performance to the oblique incidence angles for both the TE and the TM polarizations. A simple equivalent circuit model and a multi‐reflection interference theory are also investigated to quantitatively explain the physical absorption mechanism. Finally, an experiment demonstration is conducted and the measurement response indicates the validity of the proposed design and the analysis methodologies.