TIME-DOMAIN ANALYSIS OF TM SCATTERING FROM CONDUCTING CYLINDERS USINGA HYBRID METHOD

In this paper, the finite-element method (FEM) is used to solve open-r egion problems utilizing the time-domain differential form of Maxwell' s equations. The radiation boundary condition for the open-region prob lem is enforced through the time-domain Green's function as used in in tegral-equation methods, yet keeping the sparsity of the FEM matrices. In this paper, the proposed method is applied to the time-domain anal ysis of TRI scattering from conducting cylinders, At each time step, t he fields inside the discretized domain are calculated using the FEM, The computed induced currents of earlier time steps, together with con tributions from the present time step, give the radiation condition at the terminating surface. Numerical results are presented to illustrat e the applicability of this technique.