In descending order of resolution, they are finite difference methods in time-domain (FDTD), transmission line method (TLM), finite integration method in the time domain (FITD), finite element method (FEM), moment method (MoM), line method (ML), boundary element method (BEM), spectral-domain method (SM), mode-matching method (MM), transverse resonance method (TRM), and analytical method. The numerical methods are divided into zero-order, first-order, second-order, and high-order methods. These methods include analytical, semi-analytical, and numerical methods.

In the time domain, the numerical algorithms are Finite Difference Time Domain (FDTD), and Finite Integration Technology (FIT). In the frequency domain, the numerical algorithms are Finite Element Method (FEM – Finite Element Method), Method of Moments (MoM – Method of Moments), Difference Method (FDM – Finite Difference Methods), Boundary Element Method (BEM – Boundary Element Method), and the Transmission-Line-matrix Method (TLM). There are many different algorithms in computational electromagnetics, such as finite difference method in time-domain (FDTD), finite integral method in the time domain (FITD), finite element method (FE), moment method (MoM), boundary element method (BEM), spectral-domain method (SM), transmission line method (TLM), mode-matching method (MM), transverse resonance method (TRM), line method (ML) and analytical method, etc.

9 kinds of electromagnetic simulation software and methods, do you know what are they?

Cst electromagnetic