This research mainly concerns the scattering phenomena of metallic nano-coated cylinders and metal circular cylinder arrays simulated using the multiple scattering method. The multiple scattering method is a semi-analytical method for analyzing electromagnetic wave scattering by circular cylinder structures, which can provide fast calculations and accurate results. Nano-coated cylinders involving different metamaterials and physical diameters are considered and modeled. The influences of the scattering coefficients on the field enhancements are also discussed. The metal circular cylinder arrays with point or line defect are simulated and investigated. The field confinement characteristics in the point defect and field guiding in the line defect are discussed through the near-field and the Poynting power calculations.