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In this paper we use a coordinate transformation to create a cloak that covers a triangular-shaped conducting object placed on a ground plane. A finite-difference time-domain (FDTD) algorithm that uses non-orthogonal mesh cells (NFDTD) is initially utilized to test the full cloak. Using the coordinate transformation method, we have designed a ground-plane cloak that is an approximate version of the...
In this paper, a new dielectric interface treatment technique is proposed to solve curve dielectric EM problems, in which we use an average dielectric constant with area of different dielectric regions in nine spatial discrete cells to modify the update equations of electric fields. We observe that the proposed method has low numerical dispersion error, and it can use large space cells (Delta = wavelength...
This paper presents a finite-difference based CSI (FD-CSI) algorithm for solving the electromagnetic inverse problem. In contrast to the usual CSI method, the algorithm is based on a FD method, which allows for the inclusion of inhomogeneous backgrounds throughout the inversion process. Through a numerical example, it is shown that when accurate a-priori information about the scatterer is known, the...
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