A transition model for the reflection coefficient in surface scattering

A transition function for estimating the Fresnel reflection coefficient over the active frequency range is proposed based on two-dimensional moment method simulation. It naturally connects two approximations of the Fresnel coefficients R(θ) and R(θsp). In the authors´ comparisons, the model predictions by the integral equation model (IEM) with the modified Fresnel reflection coefficient are in excellent agreement with simulated data in angular, frequency and polarization dependence