A simple two-dimensional model of an infinite array of circular conductors is presented. The model is developed in two variants, a thin model and a thick model. It allows the evaluation of the shielding effectiveness of the array when the wires distances their and radius changes. The shielding effect is expressed through the transmission coefficient of a plane wave normally impinging on the screen. The model is limited to a plane wave impinging normally on the wire's plane and linearly polarized along the wires.