Negative Refractive Index Microwave Medium Scattering Properties Of Numerical Simulation Study

Negative index of refraction materials (NIRM) as an artificial material with simultaneously negative permittivity and permeability; have attracted a lot of interest in scientific community in recent years. electromagnetic waves transmitted in such material will behave some fantastic phenomena, such as reversed Dollper effect, reversed Cerenkov radition, negative Snell refraction, and so on.The discovery of negative index of refraction materials has been regarded as one of the ten most significant discoveries in science community in 2003, and has been one of the frontiers of Physics and Electromagnetism in the past few years. In this dissertation, the scattering properties of microwave negative index of refraction materials are explored by using numerical simulation.The main research activities and innovative achievements gained are as following:1. Based on the current FDTD Method, Drude Model is introduced and subsequently the difference time Domain equations in NIRM are established by using auxiliary differential equation (ADE)method and piecewise linear recursive convolution (PLRC)method. The perfectly matched layer (PML) is also applied at the absorbing boundary. As a result, the unstable phenomena in the leapfrog process got avoided. Meanwhile, the negative refraction phenomenon of negative index of refraction materials gets simulated by using new difference equations. After the stimulating result comparison with documents, it comes to a conclusion that stimulating results from the new difference equations go with the electromagnetic characteristics of NIRM, which serves as a proof of the correctness of equation deduction.2. The radar crossing sections (RCS) of conducting cylinder coated with NIRM and the electromagnetic wave reflection coefficients of conductor plate coated with NIRM are calculated by using new difference equations.Numerical results indicate that negative index of refraction materials stealth is effective in theory and reasonable selection with the NIRM parameters can greatly enhance the effectiveness of NIRM stealth.The key point of this paper lies in the deduction of difference equations in NIRM after the introduction of Drude Model and research on scattering properties of negative index of refraction materials by using numerical simulation method.With the precondition of FDTD methods' stability, this method provides a precision-improving stimulation idea. The deduced difference equation and the stimulation idea become a beneficial supplement to the NIRM materials analysis.