| With the increasing development of Radar Cross Section(RCS) reduction techniques, scattering from the slots or grooves have provided more important contribution to a target's scattering behavior.Some basic methods about the slot's electromagnetic scattering are studied and analyzed in this thesis. These methods include the quasi-static approximation formulation applied in 2-d infinite long slot, the 2-d slot scattering analysis based on integral equation and the Method of Moments, a physical basis formulation for a finite-length trough, and a quasi-static approximation combined with travel wave's scattering calculated scattering from a 3-d crack. Through many examples, these methods' characteristics are discussed. In this paper, the emphasis is the application of the FDTD arithmetic in slot's scattering. This method modifies incidence wave and the reflected wave from conducted plane, and that result in the FDTD scattering formulations are only about the scattering field of slot. After validation, the modified has obviously improved the basic FDTD arithmetic's precision. |
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