APPLICATION OF FINITE-INTEGRAL TECHNIQUE TO ELECTROMAGNETIC SCATTERING BY 2-DIMENSIONAL CAVITY-BACKED APERTURE IN A GROUND PLANE

In this work, we analyze the electromagnetic scattering by a cavity-ba cked two-dimensional (2-D) aperture in a ground plane illuminated by e ither a TE or TM plane wave. The analysis is based on the well-known g eneralized network formulation. To obtain the admittance matrix of the cavity, the cavity is modeled by triangular cylinders. Also, in order to specify inhomogeneous materials, a separate epsilon and mu may be assigned to each cylinder. Further, the cavity is analyzed applying th e finite-integral technique (FIT), which results in spurious-free solu tion. Finally, numerical examples are presented to illustrate the appl icability of the method.