 This research explains how the introduction of silver into a porous SiO2 microsphere matrix can create a random metamaterial with precise control over electrical percolation, leading to the creation of both negative permittivity and negative permeability. Additionally, the researchers demonstrate how the frequency of epsilon near zero, Enz, can be adjusted according to the amount of silver present in the material. Furthermore, they show that the material exhibits a linear relationship between the frequency of Enz and the square root of the angular frequency, indicating that it behaves like a relaxation-type spectrum. Finally, the researchers explain how these materials can be used for electromagnetic attenuation and shielding. This article was authored by Paytalsia, Zidong Zhang, Zhongyang Wang, and others.