Effects of elements distribution in near focused arrays

The performance of six configurations for focused array antennas is investigated. The proposed arrays are in the form of; Ring, Four corners with central elements, Ring with Cross, Four orthogonal arrows rotated by 45 degree, Octal with Cross and Octal with Cross without central elements arrays. The studied parameters are the size of focal spot, the depth of field, the level of field at the focal point, and sidelobes of the focused field. Computer simulations using MATLAB are used to estimate these parameters. The array of Octal firm with a cross shape shows the lowest sidelobe level. These results will be useful in array design for the different near field applications.