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shan25

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About shan25

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  1. Hi Torben, I was expecting this answer. As the wedge and corner diffracted fields from feko were predicting fields as if the plate is of PEC type. You can convey to feko developer that for a homogeneous dielectric slab/coating UTD wedge and corner diffracted formulates can be easily modified. It also seems to me that UTD corner diffracted formulations implemented in feko is based on this paper "First-order equivalent current and corner diffraction scattering from flat plate structures". This formulation is not accurate I noticed it when comparing UTD results with MoM.
  2. I applied dielectric coating to PEC plate and computed nearfield results using UTD and MoM. Thickness of the layered dielectric was set to be lambda/200. Result obtained by UTD for observation points in spherical coordinates with theta>70 deg looks identical to result obtained from a PEC plate. I have attached the result figure and feko model files. Can you please comment on the result. 4lambda4lambda_dielectric_coating_plate_dipole_MOM.cfx 4lambda4lambda_dielectric_coating_plate_dipole_UTD.cfx 4lambda4lambda_pec_plate_dipole_UTD.cfs
  3. Hi Mel, Thanks for your reply. I tried modeling the structure using FEM solver. I get this error ERROR 50058: Missing buffer zone for the anisotropic FEM region when coupling MoM and FEM I don't have any MoM regions in the model. I get the same error message when enabling/disabling "Decouple from MoM" in solver settings. Can you please explain the reason for this error message. anisodielectric_slab_xy_plane_4GHz_WH1_T_004_biaxial_2_2_8_FEM.cfx
  4. Hi I am modeling a thin bi-axial anisotropic slab with plane wave illumination using FDTD solver. In order to validate result from FDTD I made the anisotropic tensor to be isotropic and modeled the structure using MOM-MLFMM solver. When I compared the near field results I find a shift in total electric field for certain observation points. I have attached the model and postfeko file for your reference. Can you please have a look at the FDTD solver model and let me know if I have to change any simulation settings. Thanks, Shan25 anisodielectric_slab_xy_plane_4GHz_WH1_T_004_biaxial_2_2_2.cfx anisodielectric_slab_xy_plane_4GHz_WH1_T_004_biaxial_2_2_2_MOM.cfx
  5. Hello Jif Thanks for your reply. Can you let me know how to define symmetry planes in FDTD. When I activate FDTD solver in solver settings, symmetry button in solve/run tab gets disabled.
  6. Hi, I am tried simulating an dielectric lens (attached ) using varies solvers in FEKO. When I increased the diameter of the lens to be greater than 15 lambda I run into memory issues (I have a 256GB RAM computer), out of core computation also failed. I don't want to use RLGO as it is not very accurate. I tried symmetric planes in FEM simulation but no success. Can you please suggest some solution for this problem. I have a FEKO university license, when I run FDTD solver I get this error message "The voxel mesh is currently limited to less than 2 000 000 000 voxels" is there a possibility to use symmetric planes in FDTD mesh? Thanks! Manu convexconcave_lens4GHzD2_5_test.cfx
  7. 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.
  8. Thanks for your reply. Can FEKO compute the reflection and transmission coefficients of a single layer biaxial anisotropic slab problem? i.e. isotropic-biaxial anisotropic-isotropic interface. Can it also treat in homogeneous anisotropic media?
  9. I would like to know if it is possible to determine the transmission and reflection coefficient for a half space problem in FEKO? Half space problem contains isotropic-biaxial anisotropic interface. I tried modelling in FEKO and requested for the reflection and transmission coefficients, but came across simulation errors. Is there a FEKO example for this problem?
  10. Hallo JIF, Thanks for your reply, Now I can visualize rays. Does RLGO considers higher order effects such as Transmission-reflection? (i.e. transmitted at first interface, reflected at second interface and again reflected at first interface) Is the radius of curvatures of front and back faces of the lens are considered when evaluating the radius of curvature of the transmitted and reflected rays? Can RLGO handle non homogeneous anisotropic dielectric materials? Regards, Shan25
  11. I have an homogeneous isotropic dielectric lens currently modeling with RLGO solver. I would like to know if it is possible to view reflected, transmitted, wedge diffracted rays in POSTFEKO? I have attached the model cfx file for your reference. I enabled "Export ray file for post-processing" option in solver setting and tried to view UTD rays in postfeko, but postfeko stops responding. dielectric_lens_43lam_case2_rlgo.cfx
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