Geometrical and Physical Optics Analysis of Sub-THz Elliptical Dielectric Lens

This paper presents the Geometrical Optics (GO) and Physical Optics (PO) techniques for calculating the radiation pattern of a dielectric lens mounted on top of an open-ended WR6 waveguide. A ray tracing tool is used, and the far-field radiation pattern is calculated by applying Kirchhoff's Diffraction Theory on the lens surface. The results from the asymptotic methods are compared with full-wave simulation and far-field measurements at 160 GHz, with good agreement of the main lobe.