RADAR Cross Section (RCS) is the magnitude that allows to quantify the reflective power of an object, or on the contrary its electromagnetic discretion. In this work, we intend to calculate the RSC of some two-dimensional structures in a homogeneous dielectric material. But first of all, we should begin by studying the theoretical basis of integral equations which allow to reach the calculation of this quantity, which is the RCS. We will describe the theoretical foundations on which the TEHD digital program is based and which we have developed to calculate the RCS of undefined cylindrical dielectrics upon which falls an incident TE wave (E_Z= 0).