Abstract
Conference Title: 2015 Loughborough Antennas & Propagation Conference (LAPC) Conference Start Date: 2015, Nov. 2 Conference End Date: 2015, Nov. 3 Conference Location: Loughborough, Leicestershire, United Kingdom This paper presents the design of a 3D-printed flat graded-index lens based on ray optics. The lens is comprised of several concentric dielectric rings with bespoke relative permittivities for transforming spherical waves into plane waves. 3D-printing was used to fabricate this lens with graded and tailored dielectric properties in a single process. The 3D-printed flat lens is low-cost and light-weight, but provides broadband and high gain performance. Measurement results show that the realised gain of the lens is 8 to 10 dB over the frequency band ranging from 12 to 18 GHz.