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May I know if it is possible to define a gradient index dielectric media in FEKO? I would like to define a radial GRIN formulation for representing variation of refractive index.
Hello shan25,
I don't have much experience with metamaterials, but FEKO does support them. However, for a gradient index media, the media properties need to change as a function of its position (correct?) and that is not supported in FEKO at the moment. FEKO only supports media properties that vary as a function of frequency.
Hi Shan
FEKO is a very powerful tool for Microwave lens design. If the lens aperture is not very large MLFMM is a the best solver to choose for modelling dielectric lenses.
If the lens is large then RLGO is very fast and efficient way to model the lens.
A proof of concept is shown in the attached pictures. The lens is designed to have focal length of 250 mm.
Lens Diameter:220 mm
Thickness: 45 mm
Frequency: 12 GHz
The index of refraction at lens center equal to 2 which means permittivity of 4.
Taken from a publication where FEM was used for simulation ,which will be a very resource demanding computation , the RLGO simulation takes few minutes!
Simulation results for RLGO:
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