Design of Cascaded Millimeter Wave Radar for Concealed Item Imaging

In this paper a 12-transmitter, 16-receiver cascaded millimeter-wave(mmWave) radar is designed for scenarios such as concealed item imaging and damage detection. The designed cascaded radar has 12 transmit antennas and 16 receive antennas, forming a virtual antenna array with 192 antenna elements. The cascaded radar is sampled in space by the movement of a two-axis motorized rail for two-dimensional (2-D) image reconstruction of metal items hidden under clothing, plastic, and packaging. The cascaded radar system extends the antenna array, and shortens the imaging scanning time, which has great potential in complex security inspection applications.