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In this Chapter the time-domain analysis of the velocity of theelectromagnetic field pulses generated by a spatially compact source in freespace is presented. Recent simulations and measurements of anomaloussuperluminal, subluminal, and negative velocities are discussed. It is shownthat such velocities are local and instantaneous in nature and do not violateeither causality or special relativity. Although these effects are mainlyconfined to the near- and intermediate-field zones, some of them seemparadoxical and still lack adequate physical interpretation.

Superluminal, subluminal, and negative velocities in free-space electromagnetic propagation