ITERATIVE SCATTERING OF A GAUSSIAN-BEAM BY AN ARRAY OF CIRCULAR CONDUCTING AND DIELECTRIC CYLINDERS

The scattering of a Gaussian beam by an array of parallel circular cyl inders is investigated using an iterative scattering procedure. The cy linders axe made of homogeneous, isotropic dielectric material, perfec tly conducting material, or a combination thereof. The iterative scatt ering technique is developed to evaluate both the near and far fields due to any arbitrary number of interactions between the cylinders. The technique starts with the exact series representation of the initial scattered fields from each cylinder due to the incident Gaussian beam. Then, the sum of the initial scattered fields from all cylinders is c onsidered to be the field of an incident wave on each individual cylin der. The additional scattered field contribution is then obtained and successive scattering takes place until the boundary conditions on the surface of every cylinder are satisfied. An error criterion is develo ped to predict the number of iterations required to satisfy certain pr edetermined percentage error in the near field computations. Transvers e magnetic waves (TM) are considered in detail and the extension to tr ansverse electric waves (TE) is outlined. The effects of the incident beam parameters on the far scattered field pattern axe investigated an d numerical results axe presented for a few examples.