Near-field measurement and analysis procedures for characterizing electromagnetic interference

This dissertation discusses and studies the near-field scanning technique and its application in characterizing electromagnetic interference.; The first section reviews the history and the methodology of the near-field scanning. A brief introduction is given to the main contributions of the research work presented herein.; The second section studies the disturbance of a near-field probe to the near-field scanning. Numerical simulations were used to investigate the disturbance introduced by placing a small magnetic loop probe in the near field of a driven loop in this section.; The third section describes and demonstrates a procedure for the calibration and compensation of near-field scanning. The calibration determines the probe's receiving characteristics. The characteristics, in turn, can be used to correct for (compensate) the effects of the probe in making near field measurements. In this way, the true unperturbed fields that would have existed in the absence of the probe could be extracted from the probe's near-field measurements.; The last section of this dissertation presents a procedure for applying the equivalent current approach to the problem of characterizing radiated electromagnetic interference that may include nearby near-field objects through the use of near-field scanning measurements.