Tri-Band Dual-Linear Polarized Reflectarray Antenna with Independent Beam Control

This paper proposes a simple tri-band reflectarray antenna with independent beam control at three operating frequencies and relatively low phase sensitivity for enhanced feasibility. Simply printed on one metal layer, three sets of dipole elements are designed with less mutual interference and thus each is used to flexibly control the main beam direction in the corresponding band. The proposed reflectarray element achieves 360° phase coverage in each band and shows reduced phase sensitivity to improve aperture efficiency. A tri-band reflectarray antenna with a square aperture of side length 120 mm was prototyped and tested. The measured gain is 16.6 dBi for a 7.9-GHz main beam at 16°, 17.9 dBi for a 10.9-GHz main beam at 15°, and 20.7 dBi for the 16GHz main beam at 7°. The measured aperture efficiencies are 36.4%, 25.8%, and 22.8% at 7.9, 10.9, and 16 GHz, respectively.