Microwave Imaging of Dielectric Cylinder in Layered Media

Microwave imaging of a lossless two-dimensional dielectric object buried in layered media using time domain scattering data is considered in this paper. The method is based on volume equivalence principle and moment method. Born type approximation is adopted. It is an iterative method. In each iteration, both the direct and inverse problems are solved once. The direct problem is solved by finite-difference time domain method. To overcome the ill-posedness of the inverse problem, the pseudoinverse technique is adopted. The Green function in layered media excited by a unit line current source is derived by plane wave expansion method. Several examples are given to show the ability of this method to invert arbitrarily shaped permittivity profiles. Good imaging solutions are obtained.