Design of W-band single-layer broadband reflectarray element

In this paper, two novel W-band single-layer broadband reflectarray elements are proposed, which are respectively applied to linearly polarized and circularly polarized reflectarray antennas using a linearly polarized feed. The linearly polarized element has a flat phase slope and good broadband characteristics in the range of 86GHz to 102GHz. Besides, the circularly polarized element can convert a linearly polarized incident wave into a circularly polarized reflected wave and change the polarization mode or direction of the reflected wave by rotating the feed. It has a smooth phase shift curve and good broadband characteristics in the range of 84GHz to 100GHz.