Modified General Reflection/Transmission Coefficients for Electromagnetic Field in Cylindrically Multilayered Medium

In this paper, we present a stable formulation to calculate the electromagnetic (EM) fields excited by coaxial coil antennas in a cylindrically multilayered medium. A set of modified generalized reflection and transmission coefficients is introduced to describe the field propagation. The boundary location of each layer is extracted from the cylindrical functions and expressed in the formulations. Thus, the overflow problem for numerical computation can be naturally obviated. Those formulations can be widely used for the forward modeling of well logging.