A numerical computational method used to analyze electromagnetic fields. It uses Maxwell’s equation to derive integral equations for a target structure, and applies weighting functions (moments) to numerically calculate the distribution of currents over a structure. Unlike the FDTD method that can use structures of any given shape, the method of moments allows only certain shapes to be used. The process is also more complicated than the FDTD method. If a certain shape is used, however, this method allows high-precision analysis, so it is often used in antenna calculations.