Design and Fabrication of Dual Polarized Reflectarray in X-band

This paper presents a novel unit cell of dual linearly polarized reflectarray antenna at X band for the center frequency of 10.7 GHz. This unit cell is able to control the phase characteristics by varying the length of delay line attached to patch along the x and y axes which results reflection coefficient of less than -0.14 dB and cross polarization beyond -60 dB for the normal incidence. Its phase characteristics slope is at the center frequency. The simulation of unit cell is done based on floquet model in CST MWS 0/113 ◦ɥ/m Software. A 13×13 reflectarray antenna using proposed unit cell at the aforementioned frequency was designed, fabricated and measured. The measurement results show the maximum gain of 22.5 dB with the 43.8% aperture efficiency, 13% of 1dB gain bandwidth and the cross polarization level less than -22 dB for the E- and H-Planes.