8. Quasi-TEM Analysis of Multilayered Shielded Microstrip Lines Using Hybrid Boundary Element Method

In this paper multilayered shielded structures have been analyzed using the hybrid boundary element method. The method is based on the equivalent electrodes method, on the point-matching method for the potential of the perfect electric conductor electrodes and for the normal component of electric field at boundary surface between any two dielectric layers. The quasi-static TEM analysis is applied. The characteristic parameters (characteristic impedance and effective relative permittivity) of shielded multilayered microstrip lines are determined. The method can be use to analyze microstrip transmission lines with arbitrary configurations, arbitrary number of conductors and dielectric layers, infinitesimally thin or finite metallization thickness and finite width of substrate. It is a simple and an accurate procedure comparing to the other numerical and semi-numerical methods. In order to verify the obtained results, they have been compared with the finite element method and results that have already been reported in the literature. A very good results agreement with available data can be noticed.