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A concentric-arrayed radial line slot array (CA-RLSA) antenna is presented for THz (350 GHz) operation. This CA-RLSA antenna is optimized using particle swarm optimization (PSO) method. The PSO optimized THz antenna is demonstrated for five rows CA-RLSA. The final CA-RLSA antenna is delivering 24 dB gain, −44 dB cross-pol and has an axial ratio < 1.5 dB.
Through-wall radar images taken from man-portable systems have limited resolution due to the finite bandwidth and aperture size. However, these images can be enhanced by exploiting scene sparseness (leading to sharper images) or homogeneity (leading to more natural, i.e., visually intuitive, images). To realize these enhancements, we employ a constrained non-linear optimization algorithm based on...
Four microwave imaging methods are presented with the goal of suppressing natural clutter from such images. Unlike traditional clutter filtering approaches, based on a known clutter distribution, imaging algorithms aim to suppress any scattering mechanism not “stable” across all sensor locations. The four methods considered are (a) Coherence factor correction, (b) Model-based correction, (c) Adaptive...
A fully overlapping domain decomposition method (DDM) is proposed for finite element modeling of small features within large domains. The approach decouples the fine mesh associated with antenna details from that of the background domain. This allows for unstructured meshing, providing great flexibility in designing in situ antennas. Another advantage of this algorithm is its faster convergence as...
An efficient algorithm which utilizes non-linear optimization methods for fast super-resolution enhancement of through-wall radar imagery is proposed. The non-linear optimization methods are based around regularization of the forward model to maximize image sparseness. Algorithm efficiency is realized by employing coherence factor filtering on simple back-projection images to determine imaging regions...
A type of UWB body-of-revolution monopole antenna is presented with an outer surface which is characterized by a sequence of 2-D line segments defined by their length and angle. Using the genetic algorithm, a 24″ wide and 6″ tall metallic antenna structure is optimized to deliver a highly stable radiation pattern particularly at high frequency end (up to 2.5 GHz). Moreover, a different configuration...
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