Beam-Steering Lens Antenna for Point to Multipoint Communications at 28 GHz Band

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In this article, we propose a new design of a multibeam cylindrical Luneburg lens antenna designed in the 28 GHz band. The proposed antenna is based on the parallel plate waveguide technique, in which the plates are separated by a fixed spacing and a homogenous dielectric material is applied between the plates. The most intuitive advantage of the proposed lens against the previous ones is the simplicity of the lens profile and volume, which is essential for the whole design and manufacturing processes for high-frequency applications. In addition, it provides a cost-effective and simple mechanical assembly. To reduce the losses associated with the feed elements, the lens is excited by an array of simple and compact integrated waveguide elements. The measured results show that the proposed antenna achieves a maximum gain of 17.73 dB and a maximum beam steering angle of 57.7° in the azimuth plane. Furthermore, the measured gain of the antenna varies by only 1 dB over the entire beam steering rang and the measured side lobe level of the antenna is less than −12.2 dB.