Pseudo-Analytical Modeling for the Electromagnetic Propagation in Stratified Cylindrical Structures

In this letter, we present a pseudo-analytical formulation to model cylindrical structures composed by both radial and axial dielectric layers. In order to improve the location of the complex propagation constants, we propose a series of considerations on the argument principle, the so-called winding number technique. We use the complex coordinate stretching formulation of the perfectly matched layers to analyze unbound structures. The axial discontinuities are figured out by an analytical formulation of the mode matching technique. The mode excitation from electric current sources combined with the generalized scattering matrix allows us to accurately compute the fields along the entire structure.