| Frequently in finite difference time domain simulation of high speed digital and microwave circuits, there are devices and transmission line building blocks which can be represented by their port characteristics without considering the full-wave electromagnetic behavior within the physical structure. Separating these circuit-like features from the important electromagnetic features of a problem can lead to a significant reduction in model complexity, as well as computational savings. A method for linking the port behavior of these circuit subsystems with the time domain electromagnetic solver is needed to determine the overall performance of complex signal propagation paths. A methodology for incorporating macromodels representing arbitrary dispersive, multiport networks in finite difference time domain (FDTD) transmission line simulations is presented, along with a technique for implementation at a microstrip transmission line open end and validating examples. |
