Modeling GRIN lens in FEKO

shan25_22144
shan25_22144 Altair Community Member
edited October 2020 in Community Q&A

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. 

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Answers

  • JIF
    JIF
    Altair Employee
    edited April 2018

    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.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2018

    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: 

    <?xml version="1.0" encoding="UTF-8"?>NF.thumb.JPG.7082f71381682113411ee399435e8bf9.JPG<?xml version="1.0" encoding="UTF-8"?>Focusing.thumb.JPG.56a02a4d9a3b0885f5ae98d86d9e83de.JPG

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