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lostarmour

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lostarmour last won the day on October 2 2019

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About lostarmour

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  1. For example, take this example file I am attaching. In this I have excited only one TE mode at a frequency where the only TE mode is propagating. In this case also, in spite of having a mesh size of lambda/40, I still get some z component of E field. I guess because of this, when I add more modes, the z components due to only TE modes also get added. 1wg_OnlyTEmodes_NF_V2.cfx
  2. Yes, I have all the other modes propagating as you mentioned. Therefore, I also tested when all these modes are active (excited) at the port and the result is different. And I even excited only the TM modes out of these modes and the result is again different. I have a theoretical model on MATLAB and I use z component for TE as 0 and for TM non-zero. My only TM mode simulation in FEKO matches the results of MATLAB (all modes excited). Therefore, I expected that the only TE mode excitation in FEKO should give me almost 0 z component of electric field.
  3. Hi everyone, I have been trying to simulate a waveguide junction problem with waveguide ports to calculate the field distribution on the aperture. I have a 5 circular waveguide problem where I use only TE modes at the small waveguide port. On the other end I have used a port with 0 excitation from all the modes to ensure an absorbing boundary condition. The problem is that I still get a finite z component for the aperture E field. However, from theory we know that the aperture fields for a TE mode should have a 0 z component. This I have observed in only 1 waveguide problem too. This also happens when the discretization is lambda/25. Is that a numerical artifact? I am adding the cfx file also to this thread. circular_5wg_5modes_1mm_2cm_1mm_fields_lam25_OnlyTE.cfx
  4. Thank you very much and I am looking forward to it.
  5. In this example I actually specify which modes I need and I want to study S parameter convergence by having more modes. Is there any way to do it?
  6. Hi all, I am getting an error which says "The following message from the server process (MYID= 15): ERROR 36100: Too many modes included at a circular waveguide port." I wanted to know why does that happen. Thanks!
  7. 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
  8. 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?
  9. 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
  10. 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?
  11. 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?
  12. Yes it is very helpful. Thanks a lot.
  13. 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?
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