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A comprehensive study of 220GHz waveguide power divider has been presented in this paper, which includes a E-Y junction and a H-Y junction power divider. This research is developed for THz multi-channel array application, such as passive imaging system, aerospace remote sensing system, etc. Both the E-plane and the H-plane power divider shows the great simulation performance from 170GHz to 260GHz...
This paper presents our study on a sparse antenna array for 0.22 THz imaging. Based on the effective aperture concept for the design of sparse antenna array, two schemes for high performance THz imaging of a target at distance of 1 m have been achieved in simulation. Then, different schemes of larger array element spacing and mechanical scanning spacing have been investigated to build the relationship...
This paper presents a low-cost UWB radar system for imaging concealed metallic targets. A rotating linear UWB antenna array is adopted to form a 2D aperture. LabVIEW is used to enable an automated control of the array. Two imaging algorithms, i.e. Delay-and-Sum (DAS) and Time Reversal (TR) are employed in simulation and experiment. It is shown that the DAS method is better at imaging in free space,...
The detection of concealed metallic weapons in bags/suitcase by using UWB (ultra widbeband) imaging is a cheap alternative to the security in the airport, subway or public area, compared to X-ray machines. In this paper, we have proposed and studied a novel UWB imaging system, including a rotating UWB antenna array, RF components and the 2D implementation of the delay-and-sum (DAS) imaging algorithm.
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