Exponential time differencing based efficient SC-PML for RCS simulation

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.