Abstract
An analytical transmission line (TL) coupling model is presented for evaluating the deviation between the susceptibility of a DUT in the near- and far-field of a noise source. Appropriate field solutions of elementary antennas are used in combination with coupling equations of an electrically short two-wire TL. A normalized coupling is defined to quantify the difference between the near- and far-field disturbances. It is found that the field coverage and the wave impedance of the radiating source are the dominant factors. The evaluation of the normalized coupling voltage results in potential deviations up to an order of magnitude. Therefore, it is concluded that standard EMC-test in the far-field may not always reflect the coupling level under different realistic circumstances appropriately. The analytical model is validated by accurate three dimensional field simulations and experiments.
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