UWB Millimeter-wave 1D MIMO Array for Non-destructive Testing

A sparse, UWB, multi-module 1D MIMO array at D-band (110-160 GHz) is proposed for 2D imaging of hot steel slabs during the hot rolling process in steelworks. The MIMO array consists of 22 transmitting and 175 receiving antennas. Results illustrate that the MIMO array provides significantly low level of side lobes and high resolution capability. Besides the MIMO concept and first simulations, this paper describes the wide band antenna concept which will be integrated in the system. Full-wave simulation results for the antenna show 37% bandwidth with more than 85% radiation efficiency, and stable −3 dB beamwidth over the whole frequency band.