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A dispersive conformal FDTD method has been proposed to accurately model the interface between two adjacent dispersive mediums and implemented to study the scattering of THz electromag- netic (EM) waves by inhomogeneous collisional plasma cylinder array. The method is based on the technology of area average, which is dif- ferent from existing dispersive conformal FDTD schemes. Numerical results show that the proposed method enhances the accuracy level compared to the staircasing FDTD scheme involved in the inhomoge- neous plasma. It is interesting to flnd that the THz EM waves can propagate through the plasma array more easily with higher frequen- cies or larger separations, hence the scattering width in the backward direction becomes smaller, and the forward scattering exhibits a little difierent. This study will be useful for further designing intelligent plasma antenna arrays in the THz band and terahertz reentry teleme- try through plasma.

A DISPERSIVE CONFORMAL FDTD TECHNIQUE FOR ACCURATE MODELING ELECTROMAGNETIC SCATTERING OF THZ WAVES BY INHOMOGENEOUS PLASMA CYLINDER ARRAY