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Synthesis of Arbitrary Planar Arrays with Optimised Polarisation Under Directivity Pattern Constraints Using Genetic Algorithms

Glogowski, R. ; Peixeiro, C. ; Mosig, JM

Synthesis of Arbitrary Planar Arrays with Optimised Polarisation Under Directivity Pattern Constraints Using Genetic Algorithms, Proc European Conf. on Antennas & Propagation - EUCAP, Gotheburg, Sweden, Vol. 1, pp. 1 - 1, April, 2013.

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Abstract
In this work the authors investigate the trade-off between optimising antenna array radiation pattern and optimising its polarisation properties. In most applications antenna arrays are used to obtain a desired shape of the radiation pattern. This goal is achieved by feeding the array elements using signals with amplitudes and phases that follow a special amplitude-phase law. In all the classical methods of array synthesis the polarisation properties of elementary radiators are ignored. On the other hand, the sequential rotation technique improves the quality of circular polarisation of an antenna array but cannot be used together with a more complicated beamshaping. Recently, different authors proposed methods that combine pattern synthesis with polarisation purity optimisation. However, all the proposed techniques introduce some constraints on the type of problems they can be applied to. In this work the authors propose to use evolutionary algorithms to optimise simultaneously the directivity pattern of an antenna array and its axial ratio. The resulting approach has an advantage of a great flexibility in terms of the optimisation goal definition. On top of this, a Multiobjective Genetic Algorithm is employed to generate the Pareto front in order to visualise the trade-off between the pattern shape and circular polarisation purity goals.