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Kalyan Durbhakula

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About Kalyan Durbhakula

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  1. Kalyan Durbhakula

    Parametric sweep of permittivity

    Hi Mel, It worked. I had to mesh the structure finer and that solved my problem. Thanks a lot for your valuable suggestions. I appreciate your help. --Kalyan Durbhakula
  2. Kalyan Durbhakula

    Parametric sweep of permittivity

    Hi Mel, Thanks for the comment. However, I cannot seem to find the automatic report generation tool. Was this tool recently added to POSTFEKO? I am using 14.0.432 version. Also, the script editor seems to have a problem with importing some .bof files into POSTFEKO, as shown below. Can you please help me understand what could be the problem here? I could not attach the .out files since their file size exceeded the max total size. Thank you --Kalyan Durbhakula
  3. Kalyan Durbhakula

    Parametric sweep of permittivity

    Hi mel, Thanks for the comment. It worked. I have a question about viewing and exporting results. I would like to export the surface currents and characteristic mode results from all POSTFEKO files into a PDF. Is there a way to do this in POSTFEKO? Thanks in advance! --Kalyan Durbhakula
  4. Kalyan Durbhakula

    Parametric sweep of permittivity

    Hello, I would like to do a parametric sweep of dielectric permittivity from 2 to 500 (no loss tangent) for a dielectric cube. In order to do that, I am using the EDITFEKO to give the required inputs and outputs. I have saved the list of permittivity values in a txt file. I would like to call this txt file and run the EDITFEKO and then save outputs. The below figure shows the piece of code from my EDITFEKO file. Unfortunately, the EDITFEKO is showing an error saying it cannot read the txt file. I also tried creating an XML file but it did not work either. I would really appreciate any help on this problem. Thanks a lot. I have also attached txt file for reference, Alternatively, can we vary the permittivity using for loop? --Kalyan Durbhakula permittivity.txt
  5. Kalyan Durbhakula

    Error 3977

    Hi JIF, We currently have FEKO 2017.2.0 and minor update (2017.2.5) available right now. However, this does not seem to resolve my problem with running A1.cfx file on Linux. I could run the same A1.cfx on Windows. I simulated a different cfx file (graphe_cshape.cfx) on Linux machine and the simulation completed without any errors. The problem only seems to be with running A1.cfx on Linux but not on Windows. I am quite not sure what is happening with this particular file (A1.cfx). Please see the attached files and please let me know if you need any information about our Linux machine configurations etc and I am happy to provide them. Thanks a lot for your help.
  6. Kalyan Durbhakula

    Importing dxf files

    I apologize for the confusion. Now I understand what you mean by finite thickness strips. All my models did not have finite thickness for strips except in my other post talking about Error 3977, where I wanted to use finite thickness for strips. I have got satisfactory answers on this post and thank you so much for your time. --Kalyan
  7. Kalyan Durbhakula

    Error 3977

    Hi JIF, Thanks for looking into that issue. We recently updated to FEKO's latest version 2017.2 on Linux. I am not sure if the latest version has not been installed properly or if the problem is something else. In addition to above design, I am seeing a similar error with another design file (please see attached A1.cfx and A1.out files) that I am trying to simulate, now with planar multilayer substrate. Thanks once again for your continuous help. --Kalyan
  8. Kalyan Durbhakula

    Importing dxf files

    Hi Peter and Jif, Thanks a lot for those great examples. I was aware of the translate and apply option, however, I was not aware that I could drag the designs using ctrl+shift to any reference locations. Your suggestions really helped expedite the process. JIF, I can understand that creating a finite substrate and solving it using MoM takes huge time. Are you recommending to use the planar multilayer substrate option? Also, Can I use the layered dielectric option to assign dielectric properties to the flat 2D face in my previously attached design (B1.cfx)?
  9. Kalyan Durbhakula

    Error 3977

    Hello, I have been trying to run the attached design, however, after few minutes the simulation suddenly stops and displays the following error. I am not quite sure on why I am seeing this repeatedly. I am attaching .cfx and .out file for more information. Thanks a lot for your help in advance. paralleltraces_bayram.cfx paralleltraces_bayram.out
  10. Kalyan Durbhakula

    Importing dxf files

    Hello, In the attached B1.cfx file, I have three dxf files, which needs to be aligned on top of each other. These dxf files were sent to me by my fellow researcher. However, one dxf file is not aligning with other two files. Since I do not know their exact coordinates in 3D space, is there any way in CADFEKO that I can drag or arrange all three dxf files to the origin? The M1is a ground plane, M1_1 are the PCB traces and M1_2 is the substrate. The M1_2 needs to be sweeped in postivie z direction of certain thickness. The M1_2 is offset by some distance to M1 and M1_1 designs. Thanks a lot in advance. --Kalyan B1.cfx
  11. Kalyan Durbhakula

    Coaxial feed excitation using FEM modal port

    Hi JIF, Thank you for your timely suggestions and useful information. I really appreciate your help. --Kalyan
  12. Kalyan Durbhakula

    Coaxial feed excitation using FEM modal port

    Hi JIF, Thanks for your suggestions. I tried out all the options you mentioned in your previous 2 replies. We tweaked the geometry from last time for faster results. However, I could still not eliminate the feeding problem either with the outer metal as PEC or as dielectric material surrounded by air region. Attached are the .cfx and error message (.jpg) files for the both models. When using the dielectric material and air region, which face needs to be selected as FEM modal port? Also, I am not aware on how to do a mesh convergence study. If you have any link, cfx file or attachment that explains about this study, please share it with me. I really appreciate your help. --Kalyan FWM_FEM_outercoaxasdm.cfx FWM_FEM__Outercoaxaspec.cfx
  13. Kalyan Durbhakula

    Coaxial feed excitation using FEM modal port

    The only reason I decided to use FEM instead of MoM is the computational time and also I am only interested in the z-directed E-field, right above the patches. As you know, MoM calculates the impedance matrix and hence I would like to avoid that in my case to save computational time. Please correct me if I am wrong here. But, thanks for the "unit cell" suggestion, I will definitely give it a try.
  14. Kalyan Durbhakula

    Coaxial feed excitation using FEM modal port

    Hello, I have been trying to excite the coax feed using a FEM modal port, however, I am seeing an error, which says "Missing buffer zone for the FEM region when decoupling MoM and FEM". Can somebody please help me understand what this error means and solution to this error ? The outer cylinder of coax is copper and the inner cylinder is a pec. Also, is there anyway in FEKO to accelerate meshing for large structures? Attached is the design that I am working on. I really appreciate any suggestions or help. Thanks. DESIGN_MOM_updated.cfx
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