Millimetre-wave multi-view near-field scattering tomography system

In a previous study by Shahir et al., the permittivity profile of object under test (OUT) from electric fields measured outside OUT is accurately estimated by considering the region of interest confined within the boundary of the OUT. This study proposes a continuous-wave multi-view near-field scattering tomography system at the millimetre-wave frequency range and reformulates the sub-space approach for reconstructing the continuous-wave tomographic images while considering the region of interest beyond the OUT boundary. The OUT reconstructed tomographic images enable one to localise the OUT boundaries. The proposed system also eliminates the need for fully systemic isolation (i.e. anechoic chamber) or water as a background medium by reducing multipath effects substantially at millimetre wave. The system performance is evaluated by reconstructing the tomographic images of various samples, and the experimental results are presented.