Abstract
The standard active element pattern (AEP) method is presented to predict the radiation from large-scale arrays, in which the AEPs of large array are approximated by those of a small array. However, this method needs to compute and store each AEP of the small array. To avoid this fussy process, a novel AEP method is derived, which simply formulates the radiation field of the large array with that of two small arrays. Furthermore, using the AEP method to evaluate the fitness function of genetic algorithm, a low sidelobe level linear array of 16 aperture-coupled microstrip antennas is designed by optimisation of the element excitations. Numerical results show that the modified AEP method has the same accuracy as the Ansoft HFSS simulation while saving 71% computational cost compared to the standard AEP method.
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