Frequency resolved susceptibility testing as a substitute for angular resolved susceptibility testing

In commercial radiated susceptibility testing, only a few irradiation directions are used, making the risk of undertesting huge. We propose a model to reduce the undertesting without increasing the number of irradiation directions. The method uses frequency resolved radiated susceptibility testing as a substitute for the angular resolved radiated susceptibility testing. We have experimentally tested the model on different test objects, and it generally works, but fails within some limited frequency intervals, due to resonance peaks in the susceptibility of the equipment under test.