Zoning technique for a broadband fishnet metamaterial lens

The profile of any lens can be reduced by applying a zoning technique, at the expense of a narrower frequency range. Here, using an optimized zoning technique, a slim broadband zoned fishnet metamaterial lens with fractional bandwidth of 8.5% is designed, fabricated and measured at millimeter waves. Measurements are in good accordance with simulation results and demonstrate good performance of the zoned fishnet metamaterial lens. A high directivity of 16.6 dBi is experimentally achieved in the lens antenna system.