To efficiently simulate and calculate the radar cross section (RCS) related electromagnetic problems by employing the finite-difference time-domain (FDTD) algorithm, an efficient stretched coordinate perfectly matched layer (ESC-PML) based upon the exponential time differencing (ETD) method is proposed. The proposed implementation can not only reduce the number of auxiliary variables in the SC-PML regions but also maintain the ability of the original SC-PML in terms of the absorbing performance. Compared with the other existed algorithms, the ETD-FDTD method shows the least memory consumption resulting in the computational efficiency. The effectiveness and efficiency of the proposed ESC-PML scheme is verified through the RCS relevant problems including the perfect E conductor (PEC) sphere model and the patch antenna model. The results indicate that the proposed scheme has the advantages of the ETD-FDTD method and ESC-PML scheme in terms of high computational efficiency and considerable computational accuracy.

中文翻译：

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基于指数时差的高效 SC-PML 用于 RCS 仿真

通过采用有限差分时域 (FDTD) 算法，一种基于指数时间差分 (ETD) 的高效拉伸坐标完美匹配层 (ESC-PML)，有效地模拟和计算雷达截面 (RCS) 相关的电磁问题方法提出。所提出的实现不仅可以减少 SC-PML 区域中辅助变量的数量，还可以保持原始 SC-PML 在吸收性能方面的能力。与其他现有算法相比，ETD-FDTD 方法显示出最少的内存消耗，从而提高了计算效率。通过RCS相关问题，包括完美E导体（PEC）球模型和贴片天线模型，验证了所提出的ESC-PML方案的有效性和效率。