Correction applied to the propagation model of UWB wave in human biological tissue obtained by FDTD method for estimation of the wave form at the heart

This work studies the spread of a UWB pulse in biological tissue, which forms the propagation media to the electromagnetic waves to detect a heartbeat. This tissue is multiple Modeled as semi-infinite lossy and dispersive media. The study focused on the deformations at the interfaces between two successive layers. The FDTD method is an approach for solving Maxwell´s equations. However, we note at the interfaces, the distortion signal. This is observed in the attenuation of energy signal. In this article we try to understand the origins of these disturbances, to find a solution for these perturbations, and, to estimate the waveform by adding an adaptive mesh at the interfaces.