Compact Reflectarray Antenna Element using Split Ring Resonator

This paper presents a compact reflectarray element using split ring resonators (SRRs) for small size and high gain reflectarray design. The proposed element is constructed of dual concentric split rings and a metal line on different layers. Several design parameters of the unit cell are studied for obtaining better phase response. The proposed unit cell achieves a good phase response of 700 degrees at X-band. The unit cell size is 14 mm x 14 mm (0.36 lambda(0) x 0.36 lambda(0)). Due to the small unit cell size, the reflectarray with the proposed element can be expected to achieve high gain.