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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,...
Investigations into a device that separates one input signal into two signals of equal power, namely 3dB power divider, were carried out. This paper presents 3dB power divider using double layer metal slotted structure without any dielectric plate. The proposed structure with low coupling effect operates at 54GHz and has a 2GHz bandwidth. All the operating principles and simulation characteristics...
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.
This paper presents our latest study on the design of reconfigurable antennas and the performance achievable by employing such antennas in multiple-input multiple-output (MIMO) systems. The proposed antenna system consists of two identical dielectric resonator antennas (DRA) placed on a horizontal ground plane and separated by a distance of 0.2}i at design frequency of 2.45 GHz. Each element has three...
This paper presents our study on the dielectric resonator antennas (DRA) to achieve pattern reconfigurability. The antenna array consists of two identical DRA placed at the center of two perpendicular planes. The antenna demonstrates radiation pattern reconfiguration in the 2.4 GHz frequency spectrum and therefore improves the channel capacity of a MIMO communication system. With 3 antenna modes in...
This paper presents our initial study on a novel reconfigurable MIMO slot antenna to achieve pattern diversity and therefore improve the system performance. The MIMO antenna consists of two identical reconfigurable slot antennas which are separated by a distance of less than quarter wavelength designed at the frequency of 5.2 GHz suitable for WLAN applications. Each of the slots can be reconfigured...
This paper features some of the recent advances in study of the 802.11n Compact MIMO DRA, developed at the Sony Ericsson Research Center and Queen Mary, University of London. The indoor MIMO channel capacity is analysed in a MIMO channel model based on the ray tracing technique. The performances of the 3-element DRA are compared with a 3-element lambda/2 spaced, ideal dipole uniform linear array.
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