Double layer polarization insensitive metamaterial absorber with dual resonances

This paper presents the design of double layer polarization insensitive metamaterial absorber with dual resonant frequencies at 9 and 10 GHz. A unit cell of the metamaterial consists of four circular rings with copper lines printed on 0.8 mm thick FR4 substrate. The simulated result shows that the dual band metamaterial absorber achieves 89.25 and 95.97% for normal incident electromagnetic waves at 9 and 10 GHz respectively. The corresponding full width half maximum (FWHM) are 2.99 and 3.32%. The simulation result verified that the absorber is perform well at any polarization of incident electromagnetic waves and operate at wide operating angles which are 63° and 62° for TE mode and TM mode respectively