Millimeter-Wave Multi-Beamforming Reflectarray Antenna with Wide-Angle Beam Scanning

In this article, a millimeter-wave beamforming reflectarray antenna with a U-shaped parasitic wideband patch element employed in a 1×10 configuration as the one-dimensional feed source is proposed. The one-dimensional phase-controlled feed source can generate ±50° beam scanning along the H-plane direction, while covering a wide impedance bandwidth range of 70–85 GHz. The size of the array based on the outer square inner ring reflection structure is 65.6mm × 131.2mm, which is used to compensate for the spatial wave path difference of the feed with a focal length of 33mm. By using a single-layer planar reflection structure, the spherical wave on the E-plane is converted to plane wave, while ensuring that the phase compensation on the H-plane remains unchanged to further increase the spatial beam gain. An optimization design was conducted on a one-dimensional planar reflector array, and the results indicate that this array can achieve wide scanning angle of ±40°in the horizontal plane (H-plane), with a maximum gain of 23.l dBi.