基于FIT的外壳开孔屏蔽性能仿真计算

Shielding Efficiency Simulation of Aperture in an Enclosure Based on FIT

针对电气产品中的屏蔽问题,使用时域有限积分算法,对电气电子产品的机箱外壳开孔问题作了电磁场仿真,适用于辐射电磁干扰典型的频段30 MHz^1 GHz,计算并比较其屏蔽效能.仿真计算的结果表明,在相同面积、不同形状的开孔情况下,电场屏蔽效能和磁场屏蔽效能的特性,为设计电磁兼容屏蔽提供了帮助.

Apertures in a enclosure of electronic equipment are main channels of radio disturbance radiated. Based on FIT, this paper simulates electromagnetic field for Shielding Efficiency, applied on typical radiated emission frequency（30 MHz ～ 1 GHz） ,their shilding efficiencies are computed and compared. The simulation results show that SE for E-field and H-Field are different under the same area and different shapes. It is helpful for engineers who are designing EMC shields.