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Some experiences from FDTD analysis of infinite and finite multi-octave phased arrays

机译：FDTD分析无限和有限多倍频程相控阵的一些经验

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摘要

Some experiences from finite-differences time-domain (FDTD) analysis of infinite and finite multi-octave phased arrays are presented. First, a more unified derivation of equations suitable for unit-cell analysis of phased arrays or other types of periodic structures using FDTD is presented. Second, results from FDTD calculations of small to very large multi-octave finite arrays are summarized in order to answer the question of how large an array model must be in order to capture the characteristics of both the interior and the edge elements of a large multi-octave phased array. It is found that a considerably larger number of elements is required in the broad-band case than in the normal narrow-band case, and it is also found that FDTD is well suited for such calculations. Third, simple methods to save computer memory using locally fine grids in an otherwise coarse FDTD grid to model finite-phased arrays are explored. The two local grid methods tested were found in our application to suffer from numerical instabilities.
机译：给出了无限和有限多倍频程相控阵的时域有限差分时域分析的一些经验。首先，提出了适用于使用FDTD对相控阵或其他类型的周期性结构进行单元格分析的方程式的更统一推导。其次，总结了从小到非常大的多倍频程有限阵列的FDTD计算结果，以回答为了捕获大型多倍频程的内部和边缘元素的特征而必须具有多大阵列模型的问题。 -倍频程相控阵。已经发现，与正常的窄带情况相比，在宽带情况下需要大量的元素，并且还发现FDTD非常适合这种计算。第三，探索了一种简单的方法来节省计算机内存，这些方法可以使用本地的精细网格（在其他情况下为粗略的FDTD网格）来建模有限相控阵。在我们的应用程序中发现测试的两种局部网格方法存在数值不稳定性。

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