- Dielectric Lens Antennas
Axial choke horn antenna with lens
Lenses are classically used by engineers and scientists to shape wave fronts. In some cases the wave fronts are focused, while in other cases they are defocused to split energy in different directions according to the designer's requirements. Such lenses may be implemented in a wide range of materials and shapes, ranging from planar 2D lenses printed on PCB to 3D lenses made out of various dielectric materials.
FEKO offers users several numerical methods that are applicable to the modelling of lenses. Each method has its own particular strengths and when applied correctly can accurately and quickly perform simulations for any kind of lens. Examples of FEKO numerical methods that are applicable to lens modelling include:
- Method of Moments (MoM) with its planar Green's function, surface equivalence principle and volume equivalence principle for full-wave modelling of dielectric lenses.
- Multi-level Fast Multipole Method (MLFMM) for the full-wave solution of electrically large MoM problems.
- Ray Launching Geometric Optics (RL-GO) for the solution of problems that are computationally expensive to solve with full-wave methods and where fast, memory economical solutions are required.
A typical example of a printed lens is the Rotman lens configuration. This clip demonstrates how energy incident on a single port of the Rotman lens is equally distributed to all relevant output ports of the lens. As this lens is a printed circuit, the MoM planar Green's function method was used to model the lens in FEKO and animations were produced in POSTFEKO.
Current distribution over printed Rotman lens animated vs. phase
Axial choke horn antenna Slot coupled microstrip patch antenna Focusing effect of a lens for antennas