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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.
Achieving high data rate greater than 200Mbps for MB-OFDM UWB communications is a challenging task. Constrains of limited power and degrading transmission medium are the key hurdles. Currently most existing data systems can reach a data rate of only 80Mbps. This study proposes the use of spatial diversity to enhance the MB-OFDM UWB system performance while achieving high data rate. Spatial diversity...
A novel and simple ultrawideband (UWB) printed quasi-self-complementary antenna is presented. The proposed antenna, which is fed by a microstrip line, has been demonstrated to provide an ultrawide 10-dB impedance bandwidth with satisfactory radiation properties. It also features both physically and electrically small dimensions, 16 mm times 25 mm in a physical size and 0.24lambda in an electrical...
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