Mathematics 13 Electromagnetism 11 Finite differences 7 Numerical solutions 7 Time-domain analysis 6 Mathematical models 5 Antenna arrays 3 Boundary value problems 3 Design and construction 3 Finite element method 3 Mathematical optimization 3 Maxwell equations 3 Orthogonal arrays 3 Taguchi methods (Quality control) 3 Ultra-wideband antennas 3 Wavelets (Mathematics) 3 Chirality 2 Electromagnetic waves 2 Iterative methods (Mathematics) 2 Multigrid methods (Numerical analysis) 2 Scattering 2 Boundary element methods 1 Electric lines -- 1 Electric power transmission -- 1 Electromagnetic theory -- 1 Galerkin methods 1 Integral equations 1 Magnetic fields 1 Magnetism of ships 1 Microwave filters 1