A 3-GHz microwave imaging system based on a modulated scattering technique and on a modified born approximation

Abstract

This article deals with short-range active microwave imaging. In particular, a 3-GHz imaging system based on a modulated scattering technique 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 scattered by a long cylinder under approximately transverse-magnetic illumination conditions. Moreover, some considerations are made concerning the relationship for the modulated scattering techniques. Finally, some preliminary experimental results are presented. They were obtained by using a numerical approach to the electromagnetic inverse scattering problem which is developed in the spatial domain, and by making use of a modified Born approximation. © 1998 John Wiley & Sons, Inc.