The lenses are used to collimate incident energy and to prevent it from spreading in undesired directions (the beam focusing).
In this application note, we show Luneburg lens illuminated by corrugated horn antenna. The lens is represented as spherically symmetric structure with variable index of refraction. Basically, Luneburg lens is modelled in WIPL-D Pro as 5 spheres with coinciding centers.
The simulation results include 2D and 3D radiation pattern, as well as focused near field. Comparing free space radiation with the radiation of the overall lens shows energy collimation and gain increase. Simulations are carried out at inexpensive desktop PC, while the simulation can be further speeded up by using the GPU solver.