Study of the Electromagnetic Field from the Shielded Microstrip Line Using the Finite Difference Method

This chapter aims to study the electromagnetic field in the shielded microstrip line using the Finite Difference Method (FDM), which reflects the phenomena in the analyzed structure. FDM, successfully used to solve the most difficult scalar and vector problems of electrodynamics, facilitates the approximation of the Helmholtz equations in a finite number of the analyzed domains. The main advantage of the method is developed, which consists of bringing together the air and dielectric substrate domains in a single problem, which allows the boundary conditions to be easily defined. In the final section of the chapter, the results and graphs of the electromagnetic field components are presented. Simulations of the interface at the boundary of the air and dielectric domains are also highlighted. The higher-order hybrid propagation modes are determined by selecting the eigenvalues one by one in increasing order of frequency.