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2008-10-27
Dual Beam Synthesis Using Element Position Perturbations and the G3-GA Algorithm
By
Progress In Electromagnetics Research, Vol. 87, 43-61, 2008
Abstract
The position perturbations of linear antenna elements are used for designing non-uniformly spaced reconfigurable antennas radiating with multiple pattern such that the same amplitude distribution and perturbed positions produces either a pencil or a flat topped beam, the difference being dependent upon phase distribution of the array. The perturbation method consists of inducing small perturbations in the element positions of a linear array to obtain the desired patterns and offer the flexibility of simple design and is similar to other adaptive techniques like phase only or phase/amplitude synthesis. The problem of finding the element position perturbations is treated as a non linear problem and has been solved using a the generalized generation gap steady state genetic algorithm (G3-GA) using parent centric crossover. In the G3-GA approach the population diversity versus selection pressure problem considers both the parent selection and the replacement plans of GA. The positionphase synthesis method using the G3-GA approach is compared with the G3-GA phase-only synthesis technique. It is seen that, an optimal set of element-perturbed positions in a constrained position range with uniform amplitude, unequally spaced elements with unequal phases has the potential to overcome the design challenge of phase only syntheses that uses a larger number of elements to get the same desired side lobe level. Further when the main beam is scanned it is found that the proposed method can maintain a sidelobe level without distortion during beam steering for the angular positions studied.
Citation
Sevoor Meenakshisund Vaitheeswaran , "Dual Beam Synthesis Using Element Position Perturbations and the G3-GA Algorithm," Progress In Electromagnetics Research, Vol. 87, 43-61, 2008.
doi:10.2528/PIER08091601
http://www.jpier.org/PIER/pier.php?paper=08091601
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