A wideband circularly polarized 2x2 sequentially rotated patch antenna array

A wideband circularly polarized 2 X 2 sequentially rotated patch antenna array is presented. This array applies the wideband circularly polarized elements to the sequential rotated feeding to realize wide bandwidth by a simple structure. A measured -10-dB return loss bandwidth of 102% and an AR < 3-dB bandwidth of 43.7% are obtained. (c) 2007 Wiley Periodicals, Inc.