Dual-polarized feed for mmWave lens antennas

Sammanfattning: The fact of being bulky and not very cost-efficient made lens antennas not to be takenmuch into account in the past. Nowadays, this kind of antennas has attracted moreattention due to the increasing demand of higher frequencies in 5G, where lensesbecome considerably smaller. Moreover, the advances achieved in manufacturingtechniques such as 3D printing have reduced the costs to a great extent. Lenses canbe used to transform the Electromagnetic (EM) waves coming from a source into anydesired radiation pattern. For example, a directive beam in any specific direction couldcounteract the higher path losses at the new frequency bands used in 5G.In order to feed the lens, a transition from a coaxial cable to a waveguide or hornantenna working at the desired frequency band has been used as the source. However,most of the time, these feeds are only able to support a single polarization, thus notexploiting the capabilities, such as the increase in capacity, of using Polarization-Division Multiplexing (PDM).In this thesis, a system composed of a dual-polarized array feed and a Gutman lensoperating at the frequency band of 28 GHz is designed and simulated in order toanalyze its performance. Commercial software CST Microwave Studio is used for thatpurpose. Some prototype ideas to be manufactured in the future are also analyzed.