Dual-band dual-polarized reconfigurable unit-cell for reflectarray antenna in Ku-Band

This paper presents a reconfigurable dual-band dual-polarized reflectarray cell at Ku band centered at 12 and 14 GHz. The novel unit-cell is composed of a printed cross-dipole element with a rectangular split-ring element. In order to achieve reconfigurable capability, 5 varactor diodes controlled by only two voltages- one for each frequency- are employed to control the phase response of the unit-cell. Simulated results show that at each frequency band the phase response is dependent on only one of the applied voltages. This means that by using the proposed unit-cell, a single layer microstrip reflectarray antenna could be realized possessing independent beam scanning capability in two closely separated frequency bands.