Abstract: For further understanding of the interactions between different materials in the electromagnetic metamaterials, the change characteristics of the effective permittivity of wire array embedded in a single negative permeability medium were analyzed theoretically. The interactions between the single negative permittivity and single negative permeability were investigated using both numerical calculation and electromagnetic simulation methods. The strategy of reducing such interactions was also proposed. The simulation results indicate that the wire array embedded directly in the single negative permeability medium exhibits only transmission forbidden band in the whole frequency band. While the wires are cladded with dielectric insulation materials, the above forbidden band turns into transmis