A schematic representation for a recursively generated thinned hexagonal array. The first four stages of growth are indicated by the blue (Stage 1), red (Stage 2), green (Stage 3), and orange (Stage 4) arrays respectively. The six-element generating sub-array is shown in the upper-right-hand corner, where the elements are located at the vertices of the hexagon.

Contour plots of the radiation patterns for Stage 1 through Stage 4 of the recursively generated thinned hexagonal arrays shown in the previous figure.