A highly efficient numerical solution for dielectric-coated PEC targets
A highly efficient numerical solution for dielectric-coated PEC targets
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DOI：
10.1080/17455030802520883
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发表时间：
2009-02
影响因子：
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通讯作者：
Shiquan He;Z. Nie;Jiangong Wei;Jun Hu
中科院分区：
文献类型：
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作者：
Shiquan He;Z. Nie;Jiangong Wei;Jun Hu
本文首次提出了多层介质薄片积分方程方法。该方法将几何模型划分为多个薄层，并假设每层内的磁通密度相对于法线方向恒定。因此，在保持结果精度的同时，大大减少了未知数的数量。然后，将多层TDS积分法与PEC（完美电导体）边界条件相结合，处理介质包覆PEC物体的散射。这种新方法将耦合表面（对于导体）-体积（对于电介质）积分简化为具有更少未知数的表面-表面积分。此外，本文还提出了一种补救方法，以改善开放组合结构在边界附近由于明显的奇异电流而导致的精度下降。与传统的PEC-TDS方法相比，本文提出的方法可以处理具有任意横向或正向不均匀性的厚层或分层涂层的散射。它的改进也能够处理开放的PEC表面上的介电涂层。最后的数值计算结果与文献吻合较好，表明了这些解的准确性和有效性。
In this paper, the multi-layer TDS (thin dielectric sheet) integral equation approach is first proposed. This method divides the geometric model into multiple thin layers and assumes the flux density to be constant with respect to the normal direction within each layer. Consequently, the number of unknowns is significantly reduced while the precision of the results could be maintained. Then, the multi-layer TDS integral approach is combined with the PEC (perfect electric conductor) boundary conditions together to handle scattering from dielectric coated PEC objects. This new procedure simplifies the coupled surface (for the conductor)–volume (for dielectric) integral to a surface–surface integral with much fewer unknowns. Furthermore, a remedy approach is also presented in this paper to improve the deteriorated precision for open composed structures due to the significant singular currents near the boundary edges. Compared with traditional PEC-TDS methods, the method presented in this paper can deal with scattering from thick or stratified coatings with arbitrarily lateral or normal inhomogeneity. Its improvement is also capable of handling dielectric coatings on open PEC surfaces. The numerical results at the end show good agreement with the references, showing the accuracy and the validity of these solutions.