Implementation of an SHF/EHF field-to-wire coupling model into IEMCAP

An SHF/EHF field-to-wire coupling model has been implemented in the Intrasystem Electromagnetic Compatibility Analysis Program (IEMCAP), which is a widely used code for intrasystem EMC modeling and analysis. IEMCAP includes a coupling model for an external field incident on a wire over a ground plane. This model incorporates a bounding algorithm based on transmission line theory. High frequencies or large distances above the ground plane cause the transmission line model to break down. The new model handles field-to-wire coupling from 1 GHz to 40 GHz. The model was verified experimentally. Tests in an anechoic chamber showed the same sensitivity of shielding effectiveness to port termination condition and the lack of sensitivity to cable length predicted by the model. Measurements of the current coupled into a bare wire above a ground plane, for a variety of illumination conditions, show excellent agreement with the theoretically derived bounds for the bare-wire coupling.<>