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Abstract
Solutions to two-dimensional electromagnetic imaging problems have been investigated extensively in recent years. Three-dimensional imaging problems have not been as well researched due to the inherent complexity of the formulation. Moreover, most of the work on imaging has concentrated on targets embedded in free space. In this paper, a technique for three-dimensional imaging based on an iterative Born method is presented. Targets with higher dielectric contrast for which the linear Born approximation is not valid can be imaged by using multiple iterations with this method. The extension of the technique to image a target buried in an inhomogeneous background is achieved by evaluating numerically the dyadic Green's function. Numerical simulations are presented to illustrate the applicability of the imaging algorithm. The results for a simulation are compared against those obtained with the inverse source method, and the difference in the performance of the two techniques is discussed. The convergence of the Born iterative method is also investigated in this paper.