Flat Luneburg Lens at 0.24 THz for Antenna Beam Steering Applications

This paper presents an all dielectric flat Luneburg lens using transformation optics for THz beam steering. Using gradient-index dielectric materials it is possible to manipulate the direction of propagation of a THz wave in the medium. However, at THz frequencies, the dielectric losses become prominent and this suppresses the gain of a dielectric lens antenna. As a result, in this work the dielectric loss of the material for the THz lens is measured precisely and used in the modelled lens in CST Microwave Studio to predict its performance. Additionally, the possibility of beam steering using such a lens at THz frequencies is also discussed.