Dual-band composite broadband absorbing material based on frequency selective surface

In this paper, A multi-layered composite wideband absorbing material covering dual band is designed and fabricated. The upper layer is a traditional absorber while the lower one is a dual-frequency frequency selective surface (FSS) formed by a square ring and an improved Jerusalem cross structure. The absorbing band has been broadened significantly compared with those of the traditional absorber without FSS. The absorbing bandwidth has been improved from 66% to 112%, within which the reflectivity is lower than ™10 dB level over a range of 3.9-13.75GHz. With the advantage of wide absorption band, the absorbing material covering C and X bands can be implemented in mobile communications, environmental protection, physical protection and absorption of electromagnetic wave shielding etc.