US Patent 9711866 Stacked parasitic array

The present disclosure is directed to a stacked parasitic array. The stacked parasitic array may include a stack of multiple parasitic antenna arrays (ex.—layers). Each of the parasitic antenna arrays (ex.—layers) may be independently tuned for multiband operation or, alternatively, the parasitic antenna arrays (ex.—layers) may be designed for common band and fed coherently as a collinear array for promoting increased gain and elevation beam steering.