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We present a novel approach to non-uniformly spaced array of radiating elements and evaluate its performance and its application potential. In general non-uniformly spaced array elements are difficult if not impossible to analyze. It is often not possible to derive analytically a closed form expression for its radiating pattern. In addition radiating elements of the array are just the primary radiating...
The design and realization of a low-profile linearly ultra-wideband (UWB) antenna array operating across 2–10 GHz with wide scan has been presented. The array element consists of a pair of identical inverted-L shaped patches and is excited by an external wideband balun to achieve low cross-polarization. Each inverted-L shaped patch is comprised of a horizontal patch and a vertical trapezoidal patch...
This paper presents a fan-beam patch antenna array with low cross-polarization. The proposed antenna array consists of 13 sub-arrays and each array has 7 elements. The element distance in each array is equal, whereas the distances between the sub-arrays are designed to be different in order to decrease the radiation in the side lobe level. Narrower beam width and lower side lobe level can be realized...
In this paper, the application of dielectric resonator antenna (DRA) array in 5G communication system is studied. Firstly, an 8-way Wilkinson power divider with fold structure is designed, whose port phase and transmission efficiency are applicable for a feed network. Secondly, a kind of semi cylindrical DRA unit operated on 28 GHz is presented. It is fed by aperture coupled microstrip line. The 8-unit...
Some major global optimization algorithms, which involves all the optimized variables in one problem, were used to synthesize time-modulated linear antenna arrays (TMLAs) in the existing literature. In this work, a hybrid approach, combining differential evolution (DE) algorithm and convex optimization, is proposed. This hybrid method is performed to optimize the static excitations amplitude and the...
The comparison of the modern microwave screening systems is given in this paper in the aspect of employing mono-static or multi-static antenna configuration, with their numerical models described and applied in the presented numerical experiments. The phenomenological model of scattering from human body and foreign objects is used to obtain the radar signal, which is processed according to the given...
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