A Planar Lens Antenna With Circular Edge Inspired by Gaussian Optics

A novel two-dimensional fan-beam lens is presented. The principle of operation of the lens is based on Gaussian optics. The focal point of the circular interface between the dielectric and air is coincident with a focal point of a hyperbolic reflector, while the feeding source is located in the other focal point. The ray tracing method along with physical optics and full wave finite element method (Ansys HFSS) are used to simulate the structure and study the effect of the feed blockage. The two-dimensional lens is implemented in a parallel-plates waveguide and a technique for matching the feeding structure is proposed. Measurement results are presented and confirm the predicted performance.