An asymptotic technique for the far field pattern of a dipole in an infinite stratified medium

Modem antennas especially arrays are being placed in layers of materials on complex environments. A rigorous recursive method for plane wave reflection and transmission coefficients (Richmond, 1965) has been used in the past for dipoles above multilayer slabs (Aktas et al., 1998). This solution is modified in this paper to account for forward and backward traveling rays with appropriate spread factors for a dipole in the media. Extensive validation for this approximate method shows good agreement with a method of moments code. This code is developed at Lawrence Livermore National Laboratory. The geometry for these comparisons uses a dipole in nontruncated dielectric multilayer slabs.