Security of air passengers is an important aim in order to achieve safe and unimpeded traffic. One of the most effective safeguards is the utilization of modern concepts for personnel screening by millimetre waves. Electromagnetic waves, with wavelengths in the region of a few millimetres, are able to penetrate the clothing. They are reflected by possible objects beneath the clothes and by the human skin, thus allowing to detect concealed items. The quality of a screening system, and as a consequence its ability to reliably recognize hidden dangers, is influenced by several technical parameters, as for instance the aperture size of the antenna array, the used bandwidth, the number of single transmitting and receiving antennas and their smart arrangement. Furthermore, the efficiency in reconstructing the image information from the gathered measurement data as well as an intelligent image processing are mandatory for a capable screening system.
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