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Metamaterials have the advantage to control the electromagnetic waves freely, and hence they have a lot of potential applications. One of the typical applications is the gradient refractive-index lens. In the earlier study and design of lens antennas, the metamaterials are used to control the wave fronts, i.e., to transform the spherical wave fronts into planar waves. In this presentation, through optimizing the lens refractive-index distribution, we introduce a method to control the electromagnetic wave amplitude and phase simultaneously on the lens aperture. By designing, the Taylor circle array amplitude and the flat phase of aperture field are achieved. We fabricate such new metamaterial lens antennas by using non-resonant metamaterial elements, which have a broad frequency band (covering from 12 GHz to 18 GHz in our experiment) with extremely high efficiency. The simulation and measurement results agree very well with high performance.

metamaterial; antenna