The high-frequency structure simulator (HFSS) utilized fine FEM solver for analyzing empirical mode decomposition preprocessing and for modeling and simulating graphene antennas. 
HFSS
Methods: The concept of graphene-based nanopatch antennas with design optimization by the finite element method (FEM) is explored.  The high-frequency structure simulator (HFSS) utilized fine FEM solver for analyzing empirical mode decomposition preprocessing and for modeling and simulating graphene antennas. 
FEM