Analysis of Electromagnetic Scattering in Waveguides by Hybrid MOM-PO-GTD Method

In this article, we present a new hybrid method combining numerical method, Moment Method (MOM) with asymptotic one, Physical optics (PO) method and the geometric theory of Diffraction (GTD), this hybrid method evaluates the surface currents on the patch antenna placed in the rectangular (EMEM) waveguides. The new hybrid current function based on Physical optics (PO) and geometric theory of Diffraction (GTD), which consist in approximating the total current on a homogeneous metallic pattern on two parts; Inside the metal is governed by the PO method, and the edge effects are defined by the GTD method. By subtraction the set of test functions (sinusoidal or triangular) by one and unique test function, we obtain a rapid convergence and less computation time. The new proposed method is used to calculate the scattering on the different geometric shape for validation purposes. The result of this new method: the electromagnetic variables like input impedance, current distribution, and electrical field are in agreement with those given by MoM method.