A Reflectarray Antenna with Inverted U Patch Backed by a Metallic Plate at 9.5 GHz

High gain requirements of antenna, especially for radar applications are a challenging task. In order to combine the high gain characteristics and low profileness of the geometrical structures, this work proposed a reflectarray antenna at the frequency 9.5 GHz. The unit cell consists of an inverted U patch etched on a substrate and backed by a metallic plate at a distance of 2 mm. The antenna was fabricated on Roger RO4003C^TM. with a relative permittivity ε_r=3.55, tan δ=0.0027 and a thickness of 0.51 mm. The simulation result shows that the reflectarray antenna design with 13×13 array form has 18.25 dBi gain oriented to 2°. The measurement validated the radiation diagram however with the main beam to the direction 18°.