A Subcell Finite-Difference Time-Domain Implementation for Narrow Slots on Conductive Panels

Abstract

Efficiently modeling thin features using the finite-difference time-domain (FDTD) method involves a considerable reduction in the spatial mesh size. However, in real-world scenarios, such reductions can lead to unaffordable memory and CPU requirements. In this manuscript, we present two stable and efficient techniques in FDTD to handle narrow apertures on conductive thin panels. One technique employs conformal methods, while the other utilizes subgridding methods. We validate their performance compared to the classical Gilbert-Holland model and present experimental results in reverberation environments to shed light on these models’ actual confidence margins in real electromagnetic compatibility (EMC) scenarios.

Accurate Nonstandard Path Integral Models for Arbitrary Dielectric Boundaries in 2-D NS-FDTD Domains

“…Nevertheless, the NS-FDTD method uses discrete space points to simulate electromagnetic wave propagation on orthogonal grids as in the FDTD technique [1][2][3][4][5]. Therefore, the discrete space treatment is unsuitable for realistic problems with arbitrarily shaped objects and fine details, not aligned to the grid axes [4,5,[7][8][9][10][11], owing to the use of the insufficient staircase approximation on orthogonal grids in an effort to model the realistic object under study. Such structures can be, frequently, encountered in various applications, ranging from electromagnetic compatibility configurations [12][13][14] and microwave devices [15][16][17] to antennas [18][19][20], optical arrangements [21][22][23][24][25], and designs of low observability, including RCS scenarios.…”