Design and fabrication of 3D-printed planar Fresnel zone plate lens

These slides give the design principle about the 3D-printed planar Fresnel zone plate lens. CST was used for simulate the lens. The lens can be modelled as 3 solid concentric rings with different permittivity (shown in the slides). The paper is open access and freely available: http://ieeexplore.ieee.org/document/7466939/