Extraction of DKglass and DKresin for PCB Striplines and Analysis of Far-End Crosstalk

Far-end crosstalk (FEXT) in typical high-speed printed circuit board striplines is primarily attributed to dielectric inhomogeneity. In this article, the inhomogeneity problem is comprehensively addressed by a novel algorithm that characterizes the dielectric constants (DKs) of glass fibers and epoxy resin. In contrast to other methods, the proposed approach enables one to assess the impact of geometrical parameters on stripline FEXT and to estimate DK_core and DK_prepreg based on DK_glass and DK_resin values extracted through analytical expressions. Full-wave simulations and real-board measurements are conducted to verify the proposed approach.