In this article, characteristic modes for metallic-dielectric composite structures (MDCS) are explored for fast and accurate analysis of scattering from large antenna arrays. Specifically, a generalized eigenvalue equation is formulated from a method of moments (MoM) impedance matrix of the electric field integral equation and Poggio, Miller, Chang, Harrington, Wu, and Tsai formulation. Modal currents for an antenna element with MDCS are then used as entire domain basis functions in the MoM for expanding equivalent currents over a large antenna array with MDCS. Only a small number of the modal currents are required to approximate the induced current over the antenna array with sufficient accuracy. Thus, the number of the unknowns and the corresponding CPU time in the MoM are significantly reduced in the proposed method. Furthermore, as the periodicity and intrinsic relationship of the matrix elements are considered when using the modal currents as entire domain basis functions, the computational efficiency of the proposed method is further improved. Numerical results of typical antenna arrays with MDCS are presented to illustrate the efficiency and accuracy of the proposed method.

中文翻译：

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使用特征模式快速分析金属-电介质复合大天线阵列的散射

在本文中，探索了金属电介质复合结构 (MDCS) 的特征模式，以快速准确地分析大型天线阵列的散射。具体而言，广义特征值方程是根据电场积分方程的矩量法 (MoM) 阻抗矩阵和 Poggio、Miller、Chang、Harrington、Wu 和 Tsai 公式来制定的。然后将具有 MDCS 的天线元件的模态电流用作 MoM 中的整个域基函数，以在具有 MDCS 的大型天线阵列上扩展等效电流。只需要少量的模态电流即可以足够的精度近似天线阵列上的感应电流。因此，在所提出的方法中，未知数的数量和 MoM 中相应的 CPU 时间显着减少。此外，由于在使用模态电流作为整个域基函数时考虑了矩阵元素的周期性和内在关系，进一步提高了该方法的计算效率。给出了具有 MDCS 的典型天线阵列的数值结果，以说明所提出方法的效率和准确性。