Dual-Band, Polarization Insensitive, and Flexible EM Wave Absorber with High Angular Stability and Low Cross Reflection Level

This paper presents a dual-band polarization-insensitive, highly angular stable and flexible EM wave absorber with low cross-polarization reflection. The proposed unit cell has two resonators C and D which offers absorptions at two distinct frequencies at 8.7 and 11.5 GHz frequency in the X band. This FSS unit cell structure has four-fold symmetry make it polarization-insensitive. The absorbance mechanism of the proposed structure is explained with the help of electric and magnetic coupling along with effective impedance plot. The simulation results reveal that for both bands, the proposed absorber is polarization insensitive and angular stable up to 600. Along with this study, reflection due to cross-polarization is also analyzed and included in the absorbance equation, confirming that the proposed design is an absorber, not a polarization converter. Finally, the absorber prototype is fabricated and tested under different conditions, and the measurement results perfectly match the simulation result, which verified that it is working.