Dual-polarized absorber based on 3-D frequency selective structure

A dual-polarized absorber based on the 3-D frequency selective structure is proposed, which consists of two-dimensional periodic array of three-dimensional unit cells and lumped components to provide matching to free space and absorb the incident electromagnetic wave. This absorber works for both TE- and TM-polarization by modify the basic building block of the original design. With suitable values for the lumped components, one can achieve a wide absorption bandwidth of 100% for TE- and TM-polarizations. The proposed absorber shows a stable performance under oblique angles of incidence for both polarizations.