A Single-Layered Hook-Shaped Unit Cell Design for Wideband Reflectarrays

A single-layered hook-shaped unit cell design is presented for wideband reflectarrays. A gentle reflected phase curve is realized by varying the hook-shaped structure's length. A reflectarray containing
$23\times 23$
elements and offset fed is designed and simulated. The gain and aperture efficiency at 10 GHz are 25.3 dBi and 62.8%, respectively. A 30.8% bandwidth for 1-dB gain drop is also obtained.