“…Generally, an ideal EM absorber should satisfy the requirements of light weight, strong absorption, wide absorption frequency range, and thin matching thickness. Depending on the attenuation mechanisms, the EM absorption materials can be mainly classified into two types: one is magnetic loss materials such as Fe [13], Co [14,15], Ni [16,17], and ferrites [1,3], while another is dielectric loss materials including CNTs [18], CuS [19], ZnO [20], and TiO 2 [21]. However, it is not facile to achieve impedance matching relying solely on dielectric loss or magnetic loss according to Z in = Z 0 (μ r /ε r ) 1/2 [22].…”