A 3-GHZ MICROWAVE IMAGING-SYSTEM BASED ON A MODULATED SCATTERING TECHNIQUE AND ON A MODIFIED BORN APPROXIMATION

This article deals with short-range active microwave imaging. In parti cular, a 3-GHz imaging system based on a modulated scattering techniqu e is described. By using a probe made of an array of (passive) dipoles rotating around a test area, it is possible to measure the field scat tered by a long cylinder under approximately transverse-magnetic illum ination conditions. Moreover, some considerations are made concerning the relationship for the modulated scattering techniques. Finally, som e preliminary experimental results are presented. They were obtained b y using a numerical approach to the electromagnetic inverse scattering problem which is developed in the spatial domain, and by making use o f a modified Born approximation. (C) 1998 John Wiley & Sons, Inc.