Dielectric Wide Angle Lenses for Millimeter-Wave Focal Plane Imaging

Various design procedures for millimeter-wave dielectric lenses have been studied and compared with regard to the wide angle characteristics of the resulting lens contours. The paper describes the simulation and optimisation of the focusing properties of the lenses for large scanning angles using a hybrid method involving ray-tracing techniques and aperture field integration, the realisation of unzoned and zoned lenses and the farfield pattern measurements at 75 and 150 GHz. The theoretical and experimental results show that a scanning range of 40° (±20°) with very low beam degradation can be achieved.