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Worst-case model of bonding strap effectiveness for equipment case irradiated by an electromagnetic field

The worst-case model to estimate bonding strap effectiveness (the ratio of induced voltage of the interference on equipment case irradiated by an electromagnetic field and grounded with a bonding strap to the voltage of the interference on ungrounded equipment case) is built. The developed computationally efficient model accounts for the resonance in the oscillating circuit formed by bonding strap inductance and the capacity between equipment case and ground plane. The model is designed to analysis of intersystem and intrasystem EMC and makes it possible to estimate increase in voltage on the case for the worst conditions. In addition, a rough worst-case estimate of the absolute value of voltage on equipment case is presented. The model can be used to estimate interferences induced at the shields of cables connected to equipment case. Correctness of the model was proved through validation by the method of moments (the maximum underestimate was 2 dB).