Simulation of chassis electromagnetic shielding characteristic based on ANSYS

In electronic equipment, the chassis has both the function of mechanical support and electromagnetic shielding. In the paper, the shielding effect of chassis in high-frequency electromagnetic environment is numerically analyzed with ANSYS. Through the simulation, it is can known that the maximum shielding effect can be obtained with fully shielded structure, but the cooling requirement can not be meet. Thus, the aperture is designed to enhance the thermal performance of the chassis, but a great deal of electromagnetic energy leak occurs simultaneously. To overcome the contradiction between shielding effectiveness and cooling, a waveguide window is used over the aperture. According to the theoretical and numerical analysis, an effective method to design waveguide window is proposed. The numerical simulation method of the shielding effectiveness of the chassis is validated and can be applied in applications.