通过比较不同细缝算法(TSF)计算误差随细缝宽度相对网格步长占比和频率的变化,以及各TSF算法计算获得的孔缝处及远离孔缝位置场分布的差异,给出了时域有限差分(FDTD)计算中不同TSF算法的适用性。在此基础上,将TSF算法用于分析工程中搭接缝结构的屏蔽效能问题,结果表明: 将工程搭接缝等效模型与TSF算法结合,能够使用FDTD快速地计算其屏蔽效能,有效解决了基于FDTD的含细缝复杂结构的屏蔽效能评估问题。

The applicability of thin slot formalisms(TSFs) in finite-difference time-domain(FDTD) simulation is investigated by comparing the average relative error of different TSFs to fine-gridded FDTD in terms of slot width occupancy and frequency, and by comparing the electric field distribution inside and outside the thin slot. On this basis, the TSFs are employed to predict the shielding effectiveness(SE) of metallic enclosure with thin slot and of an infinite metallic plate with an overlapped rectangular thin slot. Results demonstrate great improvement of computational efficiency caused by applying TSFs in FDTD simulation of structures containing complex thin slot, which are widely used in engineering.