A 2D Transmitarray-Augmented Luneburg Lens Antenna for Millimeter-Wave Applications

This paper demonstrates a circular transmitarray- augmented Luneburg lens antenna for beam-forming at a millimeter-wave (mmWave) regime. The proposed structure is comprised of an augmentation of 80 dielectric cubes phase correction layer and two semi-circular 10-layer Luneburg lenses. The circular transmitarray-augmented Luneburg lens antenna is fed by a 9 dBi horn antenna at normal incidence and an oblique incidence of −150. The beam is successfully transmitted with an angle up to +45°. When the feed is oriented in normal incidence, a pencil beam is transmitted at 166°and 151°with a realized gain of 20.3 dBi, and sidelobe level (SSL) below −10.0 dB, at 28 GHz.