2-D VALIDATION OF A FORMULATION FOR THE ANALYSIS OF 3-D BODIES THAT ARE PERIODIC IN ONE DIRECTION AND FINITE-SIZED IN THE OTHERS

A numerical scheme to analyze three-dimensional bodies that are period ic in one direction (z) and finite sized in the other ones (x, y) is p resented. The geometry and material composition of the body can be arb itrary. A new formulation using the Conjugate Gradient-Fast Fourier Tr ansform Method (CG-FFT) has been developed. The formulation is based o n the discretization and resolution of the Electric Field Integral Equ ation (EFIE) in both the real and spectral domains and leads to an eff icient and accurate numerical procedure. Results are presented for RCS , equivalent currents and fields inside 3-D periodic structures (infin itely long cylinders with arbitrary shape and material composition). T hese results are compared with analytical solutions and the agreement is found to be good.