Wheel-of-time array devoted to near-field imaging applications

The design and fabrication of an ultrawideband (UWB) imaging radar system for near-field applications is presented. First, the geometric parameters related to the elliptical curve of Vivaldi antenna, i.e. major and minor radii and center, are introduced as additional design parameters. Second, the complete circular UWB radar imaging system is fabricated. Finally, time-domain responses of a target under test are processed. An initial near-field image of the target under test in the area of radiation exposure is depicted, and the target is localized.