Abstract
This paper presents the design of a two-dimensional (2-D) wide-scanning flat Luneburg lens antenna operating at Ka-band. Based on the transformation optics (TO) theory, the conventional Luneburg lens is compressed to the flat form while keeping its beam focus characteristics unchanged. The 2-D flat Luneburg lens consists of six discretized lens layers made of all-dielectric materials. A 15-element linear patch antenna array is employed to feed the lens between the metallic parallel plates. Experimental results show that the 1-D beam-scanning lens antenna has a scanning coverage of $-50^{\circ} \sim 48^{\circ}$ in the azimuth plane, which can be obtained by switching the feed array elements. The 3 dB beamwidth in the elevation plane is 79° at 28 GHz due to the low profile of proposed lens antenna. With the advantages of low profile, wide-scanning and low cost, the proposed 2-D flat Luneburg lens antenna is attractive for 5G communication.
Published Version
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