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lostarmour

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  1. Hi all, I am getting an error which says it is an internal error. I always gets stuck at 7%. It happens with all kind of mesh sizes (Fine, Standard and Coarse). I am attaching the model here. circular_2wg.cfx
  2. Thanks for the insight. Does it have a rule for the standard mesh? Like how much it is going to reduce based on wavelength inside the medium and conductivity?
  3. Hello everyone, I have a small doubt regarding the mesh size of the FEM solver when the material inside a 3D body (for RCS consideration) is characterized with some finite conductivity. I can see the standard mesh default for FEM is around `\lambda/10` but with a conductivity of 10 inside a material (`\epislon_r = 1`), the mesh size for standard meshing is around `\lambda/145`. Does it change when the skin depth changes? I have attached my cfx here. Cyliner_FEM_V2.cfx
  4. Yes! However, the meaning of a face with a medium as layered dielectric as I showed in the question means that it is a thin dielectric sheet only?
  5. Hello everyone, I have a mode of a propeller in which I have only faces and edges. However, it is a 3D figure. When I want to make the medium of the model a dielectric medium, I get to choose between PEC, layered dielectric and default. The thing I do not understand is how can be a layered dielectric be a medium? Is it over a medium already? What exactly does it do when I select the medium as layered dielectric?
  6. Yes, it is very helpful. Thanks a lot.
  7. Yes it is very helpful. Thanks a lot.
  8. Hello Everyone, I want to receive the RCS data of a propeller for both co and cross polarization. When I do a calculate field in the same direction on the far field as plane wave incidence, it gives me monostatic RCS. Therefore, I assume it depends on the plane wave incidence. However, in the plane wave incidence I can put one polarization for transmit and the result that I get is the co polarization (Either HH and VV). How can I receive monostatic HV and VH?
  9. I have attached both. The second figure is wires and inside is Free Space.
  10. Hi Mel, This is the cfx file. Here the medium inside the surface of the polygon is PEC. So, if you see my plane wave model of incidence, it should be the same if I fill the medium with free space. However, I have different results. Is Feko treating the PEC as a finite conductance such that causes some kind of current distribution on the surface even though the electric field is just on the plane of the surface? Or does it consider the PEC to be of infinity conductivity? EDIT: I have attached the free space model too. 08202019_feko_one_prop_2_blades_PEC.cfx 08202019_feko_one_prop_2_blades_Free_Space.cfx
  11. Please find it. I want to run it only with UTD to save time. 2Bladdes3D_Carbide_V2.cfx
  12. I followed it and I selected UTD for each face in the model. Still, I have 2 regions too on which I can not change the solver to UTD. When I run after remeshing, I get an error which says "ERROR 2688: The model tolerance is too large as compared to the length of one UTD edge".
  13. I want to run my simulation with explicitly UTD or explicitly PO. However, I don't understand the solver settings in 2018. In default settings, I don't have the option to only select UTD as the PO/MoM has to be selected on top.
  14. I have a simple doubt. I have a 2D polygon (XY plane) on my model and the incident plane wave and electric field is also on the same plane (XY plane) and the magnetic field is perpendicular to the plane XY (on z). Theoretically the monostatic RCS should be the same for a PEC and for a Free space medium inside the polygon as the wave can't penetrate inside. And, unfortunately I can't change the properties of the edges. Edges remains edges. I can't put any material for edges in the model. And, I get different results for a PEC and for a Free Space medium inside the polygon. Why? I have made a comparison on PEC and free space. Please help. 2Blades_comparison_4_GHz.eps
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