On the convergence of common FDTD feed models for antennas
On the convergence of common FDTD feed models for antennas
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DOI：
10.1109/tap.2003.815414
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发表时间：
2003-08-01
影响因子：
5.7
通讯作者：
Smith, GS
中科院分区：
文献类型：
--
作者：
Hertel, TW;Smith, GS
时域有限差分法（FDTD）通常用于计算简单天线的输入导纳/阻抗。输入导纳/阻抗的值取决于方法中使用的离散化水平，并且随着离散化变得更精细，应该收敛到最终值。本文采用两种常见的馈源模型：硬源馈源模型和输电在线馈源模型，研究了收敛所需的离散化程度。首先，考虑了在这些模型中引入电压和电流的最简单和最朴素的方法，并证明了导纳的结果不收敛。其次，构造了在这些模型中引入电压和电流的改进方法。然后显示导纳的结果收敛，并为收敛所需的离散化水平提供指导。此外，还讨论了与导纳计算有关的两个一般问题：不同简单馈电模型计算的导纳之间的一致性，以及这些导纳与测量值之间的一致性。
The finite-difference time-domain (FDTD) method is routinely used to calculate the input admittance/impedance of simple antennas. The value of the input admittance/impedance depends on the level of discretization used in the method, and should converge to a final value as the discretization becomes finer. In this paper, the level of discretization necessary for convergence is studied using two common feed models: the hard-source feed and the transmission-line feed. First, the simplest and most naive methods for introducing the voltage and the current in these models are considered, and the results for the admittance are shown not to converge. Next, improved methods for introducing the voltage and current in these models are constructed. The results for the admittance are then shown to converge, and guidelines are offered for the level of discretization needed for convergence. In addition, two general problems associated with the computation of the admittance are discussed: the agreement between admittances computed with different simple feed models, and the agreement between these admittance's and measurements.