Electromagnetic simulation is a process of simulating and analyzing the behavior and characteristics of electromagnetic field in various equipment, systems or environments by using computer software. Through electromagnetic simulation, we can simulate and study the propagation, reflection, refraction of electromagnetic field and the response of different materials or structures to electromagnetic waves. This technique is commonly used in electronics, communications systems, antenna design, radar, radio spectrum analysis, electromagnetic compatibility assessment, and other fields related to electromagnetic fields to help engineers and researchers better understand and optimize the performance of electromagnetic systems.