THz Imaging Using Rail-Based Synthetic Aperture Radar for the Detection of Concealed Objects

We present, a rail-based synthetic aperture radar (SAR) imaging system for THz band. A 1-port full-duplex frequency extender coupled with a vector network analyzer was used as the transceiver module. Using a motorized linear stage, slanted object is scanned across the transmitter field of view and reflection is measured in frequency domain in two waveguide bands (220-325 GHz and 500-750 GHz). Processing the frequency data, images of metallic objects concealed in thick dielectric layers were reconstructed with resolution as fine as 0.8 mm.