A Wideband Reflectarray Adopting Quasi-Self-Complementary Elements

A wideband reflectarray adopting quasi-self-complementary elements is presented. The unit cell contains an inverted L-shape patch and an inverted L-shape slot embedded within a rectangular patch, forming a quasi-self-complementary configuration. The element can achieve a linear phase span of 370°, leading to a broadband behavior. Simulations reveal that adopting the proposed element, the reflectarray antenna can achieve a 39% bandwidth for 1-dB gain drop as well as a 67% aperture efficiency at 10 GHz.