Analysis of multilayered homogeneous dielectric targets by using time-domain physical optics method

An improved time-domain physical optics (TDPO) method is proposed to simulate multilayered dielectric structures, in which the characteristic matrix theory of multilayered medium is implemented. In order to accurately calculate the total reflection coefficient on the surface of the multilayered medium, a series of two-dimensional characteristic matrices are established. Based on the characteristic matrices, the total reflection coefficient can be directly derived, instead of summing up the multiple reflected and refracted waves, which is insensitive to the number of the number of the layers and the polarization of the incident wave. Numerical examples are given to validate effectiveness of the proposed TDPO method. It states that this method has much higher computational efficiency, without the loss of accuracy.