The essence of Electromagnetic Field Theory is presented in Maxwell's equations complemented with media equations and boundary conditions. Solving this equation system in a closed form can be successfully completed only in special cases; therefore mathematical computing is applied for general problem solving. Popular computing methods include the Method of Moments, MoM, the "Finite-Element-Method", FEM and the "Finite-Difference-Time-Domain method", FDTD.

The FEM method is used for phenomena of slow change or for low frequencies, whereas the FDTD method is used for fast phenomena or high frequencies. The MoM method is often convenient for solving dispersion problems of electromagnetics. For problems occurring in high frequencies it is often possible to assume that the electromagnetic field might be subject to the Ray Theory laws, which means that Ray-Tracing could be used to calculate approximate values for the field problems.

Electromagnetics problems at CSC can be solved with the Elmer software (see examples).