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Marcus Chang

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About Marcus Chang

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    Beginner

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  • Country
    Taiwan
  • Are you University user?
    Yes
  1. Dear all, So far I try to modify solver setting, active “Solve model with the multilevel fast multi pole method (MFLMM)”, and it’s seemed much more faster now. If there is any further question, I will let you know, thanks a lot. BR/Marcus
  2. Dear support team, Recently, we run a simulation for a absorber placed between sphere two horn, we would like to get S parameter from this setup. However, this simulation was stuck as shown in attached figure, LU decomposition of the matrix, for almost two days. And also I think our server system is good enough for this simulation with 512 RAM. In this simulation, how can I decrease the simulation in hour through the setting, I think it is must be something wrong in my setting for absorber in this simulation. Because it is one of an urgent studies for a paper, pleas help us solve this issue ASAP, appreciated. BR/Marcus
  3. Hi Mel, Is this warning message affect the results of the power received by near field receiving antenna? BR/Marcus
  4. Hi Mel, After I upgrade Feko to version 2019, and try to solve the same problem, another similar warning show up again as below, please check: The following message from the master process (MYID= 0): WARNING 53119: Possibly inaccurate active power (far field gain) when using equivalent sources in a coupled environment is there any suggested solution to solve it? BR/Marcus
  5. Dear all, Recently, I try to use a near field data as the source, and try to get it's far field results. However, it shows a warning message as below: WARNING 3411: No accurate power calculation possible if two non-orthogonal elementary dipoles of the same type are at the same position Received message from server process 2: WARNING 2407: Computation of the near field of a Hertzian dipole not possible at the dipole location Could you help us check what does it exactly mean in this case? Is there any solution to solve it? BR/Marcus validate NFsource radiate direction.cfx campactrange_PlaneWavesource_cornerreflector_190827_Ray_01_NearField.efe campactrange_PlaneWavesource_cornerreflector_190827_Ray_01_NearField.hfe campactrange_PlaneWavesource_metallicsphere_190827_NearField.efe campactrange_PlaneWavesource_metallicsphere_190827_NearField.hfe
  6. Hi @Torben Voigt, Recently, I tried to simulate a near field source radiate a signal to CATR reflector and use near field receiving antenna to receive the power of scattered field. The schematic diagram is shown as attached, please check it. And I found that the size of the reflector is 0.37m*0.37m, around 12 times lambda (operating frequency = 10 GHz)...if I would like to use GO method for it, it is smaller than 20 times lambda you suggest. Due to I spent almost 2 days to solve this kind of problem by using MoM/MLFMM method, is it possible to use GO method in this case? What is the tolerance range for this problem if I use GO method not MoM method? Or is there any other suggestion, such as modify the setting, to boost the simulation? BR/Marcus
  7. Hi @Torben Voigt, Now I have a question that, is it possible to change the size of corner reflector (s=3*c0/(fmin+f_inc*i), i=0 to 2) for each simualtion (per frequency, such as 9GHz, 10GHz and 11GHz in this case), if it can, can you help me modify this .lua file? BR/Marcus MacroRecording_multifreq91011GHz.lua antenna_only_NF.hfe antenna_only_NF.efe
  8. Hi @Torben Voigt, I've tried to use this .lua file to run the simulation, however, it still doesn't work, and the error message is shown as below, please check: ERROR 30968 in line 40 of the file test2.pre: Error in opening the file 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_1 To my understanding, the input characters should be like this: 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_1.efe not like this: 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_1 So I would like to check with you, how can I write a propreiate code to generate the character string shown as above, such as: 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_1.efe 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_2.efe 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_3.efe BR/Marcus test2.cfx temp.lua
  9. Hi @Torben Voigt, Here is another question for scripting related to this case. If I have three E-field and H-field data, and I would like to use it as my source in next simulation. So I write a script as attached, however, it seemed like I must to input file named including .efe or .hfe these characters. I want to let the input looked like this: but I don't know how to modify this script, such as how to add additional .efe or .hfe these characters to the code as below: properties.EFieldFilename = [[02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_]]..i properties.HFieldFilename = [[02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_]]..i If I use the script as shown as above, it will be looked like: BR/Marcus 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_1.efe 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_1.hfe 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_2.efe 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_2.hfe 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_3.efe 02_NF source_PEC corner reflector_190406_sphere placed 72 lambda_alt_NearField_3.hfe temp.lua
  10. Hi @Torben Voigt, Due the the version problem, could you please help us provide the modified file in previous version (2018.2-338937 (x64)) in this transition period? BR/Marcus
  11. Hi @Torben Voigt, If I would like to do multi-frequencies simulation, such as with a bandwidth, how to use script to import near field data for every single frequency in this case. Because when I try to run a multi-frequencies problem, I use the first .cfx file and add multi-frequencies setup, I can get a NF data with multi-frequencies. But when I use this NF data as my equivalent source (NF source), the error message was shown as below: ERROR 3392: The near field source cannot be used inside an implicit frequency loop (frequency dependent data) And I check there was a member had similar problem, it seemed like I need to solve it with EDITFEKO. Can you provide us an example (EDITFEKO), for this three files, such as how to write a loop then I can finally get a plot with RCS values in a bandwidth, such as 9-11 GHz. BR/Marcus
  12. Dear Mel, Is there any update for the modified .cfx file? Looking forward receiving your response. BR/Marcus
  13. Dear Mel, Thanks for your help, it works now! BR/Marcus
  14. Dear Mel, I have tried to union all the parts, and it still didn't work. And also, due to there is an error if I use waveguide port, so I use lump port alike, to excite it. It would be grateful if you can help us modify the settings for this simulation. BR/Marcus
  15. Dear support team, Recently I try to simulate a very simple patch antenna working at 2.45 GHz, but it show an error message as below, please check it: ERROR 3849: Wrong specification of the medium for a metallic triangle and I try to open POSTFEKO and use "Find Element" method, to see the problems occurs by which triangle, but two meshes seemed like not overlap. can you help us check what's going on in my simulation? Thanks a lot! BR/Marcus patch.cfx
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