The application of transmission-line modeling (TLM) to electromagnetic compatibility problems

The essential features of transmission-line modeling (TLM) and its relevance to EMC problems are briefly described. The manner in which an EMC problem can be modeled using TLM is outlined, and three important applications are presented. Results are shown for a spherical dipole antenna placed near conducting walls, where a detailed model of the antenna and the surrounding space is used to determine the radiation resistance and its variation with proximity to the walls. The electromagnetic emission pattern from a typical device under test placed in a practical environment is determined by simulation. The current induced on wires placed on either side of a thin conducting plate is obtained by TLM, and the results are compared with measurements. Although a relatively coarse mesh of points has been used, the comparisons are very encouraging. Further developments to the code, which will allow a more efficient treatment of fine features and enhance the poser of the method to solve realistic EMC problems, are discussed.