Do you know any software that simulates electromagnetic waves or electromagnetic fields?

FIDELITY is a full three-dimensional electromagnetic field simulator based on the non-uniform grid finite difference time domain method, which can solve field distribution problems with complex filled media solution domains. Simulation results include S-, Y-, Z-parameters, VSWR, RLC equivalent circuit, near-field distribution, Poynting vector and radiation pattern, etc. FIDELITY can analyze problems with non-insulating and complex dielectric structures. It is used in microwave/millimeter wave integrated circuits (MMIC), RF printed board circuits, microstrip antennas, wires and other forms of RF antennas, HTS circuits and filters, IC internal connections and high-speed digital circuit packaging, EMI and EMC has a wide range of applications. The increasing number of related functions has put strict restrictions on electromagnetic interference. Therefore, aviation plugs are often enclosed with a metal shell to prevent internal electromagnetic energy radiation or interference from external electromagnetic fields. At low frequencies, only magnetic materials can significantly shield the magnetic field. At this time, there are certain regulations on the electrical continuity of the metal shell, that is, the shell contact resistance safety parameter insulation resistance. Insulation resistance refers to the application of voltage to the insulated part of the aviation plug, thereby causing leakage current in or on the surface of the insulated part. And the resistance value presented.