A Generalized Asymptotic Extraction Solution for Antennas in Multilayered Spherical Media

An efficient model is developed to accelerate the convergence of the dyadic Green´s function´s (DGF) infinite summation when the source and observation points are placed in different layers of a dielectric sphere, thereby expediting computational analysis. The proposed procedure is based on asymptotic extraction principles in which the quasi-static images are extracted from the spectral domain DGF. The effectiveness of the approach is demonstrated in a method of moment model where a microstrip antenna as well as a conformal dipole array have been studied.