Abstract-In this article, a linear phased antenna array for beam scanning is considered with a fixed narrow/broad interference out of the scanning region. This interference is aimed to be suppressed by optimizing the positions of array elements while avoiding the rise of maximum sidelobe level (MSLL) during the main beam is scanning within the prescribed region. These two objectives; suppressing the fixed interference and avoiding the rise of MSLL during scanning are in conflict with one another. In order to evaluate the effectiveness of such multi-objective approaches it is important to report Pareto optimal solutions which are the objective way of solving multi-objective optimization problems. Thus, in this work, the genetic algorithm (GA) is introduced for the purpose of obtaining the Pareto optimal fronts for the two conflicting objectives to show the effectiveness of the proposed method.
The authors study and compare the properties of two types of highly directive broadband antennas: linear tapered slot antenna (LTSA) and leaky lens antenna (LLA). The performance in terms of dispersion and phase centre stability is investigated for both antennas over a bandwidth exceeding 1:3, by means of experimental results. The pulse distortion is quantified by calculating the angular dependence of the fidelity factor directly from the measurements. The phase centre movement with frequency is also measured and the corresponding phase error loss is estimated when these antennas are to be used as wideband feeds of reflectors. As a consequence of its high phase centre stability, LLA achieves better efficiency than LTSA in terms of phase aberration for broadband reflector systems. However, the efficiency of LTSA can be considerably enhanced by proper positioning of the antenna along the reflector axis.
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