Measurement-based circuit modeling of conducted and radiated automotive immunity test setups

Simulations of automotive immunity test setups are often used to analyze the systems at early design stages and therefore to predict and to avoid failures in advance. Accurate models for different setup structures are needed to evaluate the RF coupling levels to DUTs. In this work an accurate measurement based approach to build models for passive test setup structures is proposed. These models are applied to estimate the interfering RF current levels at DUT inputs. A measurement-based modeling procedure for BCI coupling to a cable harness and for incident field coupling to a cable harness is presented. The proposed methods reproduce the existing test setups in a simulation environment and therefore accelerate and simplify further investigations. In order to ascertain the validity of the approach, simple test structures with different termination impedances are investigated.