大型有限阵列天线中有源阻抗的渐近特性研究
Investigation of the Asymptotic Properties of Active Impedance in Large Finite Array Antennas
- Saab Surveillance（萨博监视）
- KTH Royal Institute of Technology, EECS（皇家理工学院，电气与计算机工程）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出改进的有限阵列天线全波求解器，研究发现含1000单元的有限阵列有源阻抗渐近行为与无限阵列有差异，提出的两种预测方法可判定阵列近似方法的适用时机。
AI中文摘要：
本文提出一种改进的有限阵列天线全波求解器，并用其研究大型规则阵列的有源阻抗渐近特性。该改进求解器基于适配于更通用有限几何的预处理方案及改进的数据结构，这两项改进使求解器兼具快速、稳定且内存占用更低的特性。通过研究有限阵列的有源阻抗发现，即便对于含1000个单元的阵列，其渐近行为也可能与无限阵列存在差异。结合这些特性，本文提出了关于阵列中心单元有源阻抗行为的不同预测方法，其中两种最优预测方法对所研究的宽带阵列表现出色，可用于判定单元胞法等阵列近似方法的适用时机，而非仅依据阵列大小做笼统判断。
英文摘要：
This paper presents an improved full-wave solver for finite array antennas, and uses this solver to examine asymptotic properties of active impedance for large regular arrays. The improved solver is based on a preconditioning scheme that has been adapted for use on more general finite geometries, and an improved data structure. These two improvements result in a fast and stable solver with a lower memory footprint. By investigating the active impedance of finite arrays it is found that, even for arrays with 1000 elements, asymptotic behavior may differ from infinite arrays. Tied to these properties, different predictors on how the active impedance of the center element in the array behaves are presented. The two best predictors work very well for the wideband arrays investigated, and may be used to decide when array approximations, such as unit cell methods, are appropriate, rather than general statements on array size.
