The finite difference time domain (FDTD) method has been used for the calculation of scattering (S) parameters for a number of years. A difficult problem is separating the interaction between the source excitation and the time domain reflections. In a previous paper Luebbers and Langdon (see IEEE Transactions on Antennas and Propagation, vol.44, no.7, p.1535-9, 1996) presented the idea of a voltage source with an internal source resistance as a means for exciting a microstrip patch antenna. The resistive source feed also allows one to position the feed very close to the structure, thereby reducing the number of cells and computer memory needed. In addition the number of time steps needed can be drastically reduced, especially for a resonant structure. We extend the resistive source approach to the calculation of multiport S parameters. Each FDTD calculation determines one column of the matrix. For example, if port 1 is excited then that calculation provides S/sub 11/, S/sub 21/, "...", S/sub N1/.
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机译：多年来，有限差分时域（FDTD）方法已用于计算散射（S）参数。一个困难的问题是分离源激发和时域反射之间的相互作用。在先前的论文Luebbers和Langdon（请参阅IEEE Transactions on Antennas and Propagation，第44卷，第7期，第1535-9页，1996年）中，提出了一种具有内部源电阻的电压源激励电源的想法。微带贴片天线。电阻源馈源还允许人们将馈源放置在非常靠近结构的位置，从而减少了所需的单元数量和计算机内存。另外，可以大大减少所需的时间步长，特别是对于谐振结构。我们将电阻源方法扩展到多端口S参数的计算。每次FDTD计算都会确定矩阵的一列。例如，如果端口1被激励，则该计算将提供S / sub 11 /，S / sub 21 /，“ ...”，S / sub N1 /。
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