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Found 55 results

  1. Hi, I have 16 sets of configuration in CADFEKO that generate near and far field in each set of configuration. Can I know how to generate a continuous result for near and far field in POSTFEKO? The result that I want is not in the form of Out file display but in the form of Cartesian graph. It is because results that are able to be plotted in the Cartesian graph can exported to clipboard as well. If there is a need to use parameter sweep in this case, can anyone help me on how to link parameter sweep with the multiple near and far field? The snapshot of the activity done in the CADFEKO and POSTFEKO will be attached as well. Hope to hear from you soon. Thank you. Each set of configuration has different scattered angle of near and far field. Image of POSTFEKO.
  2. Is there any option in feko to import far field radiation pattern E theta and E phi? Please help
  3. I'm having a problem with the parameter sweep macro in Cadfeko/Postfeko. The model creation and solver portion of the macro generates the cfx files and runs the models ok, no problem there. I have an issue when the "combine results" macro is run in Postfeko; either when it's run "automatically" on completion of the Feko solver or if I run "combine_parameter_sweep_results" in the script editor. In some cases, the results files are combined properly in Postfeko and everything is fine, but in about half the sweeps that I've tried to run, the macro fails with: ------ Running combine_parameter_sweep_results ------ Found 1 NearFields(s) Found 1 Power(s) .\shared_helper.lua:116: Error 18111: The number of values on the axis must be the same as the number of data sets provided. shared_helper.lua line 116 is just: 115 function error( message ) 116 error_( CleanMessage( message ) ) 117 end I've tried to debug, but I can't find the error code listed anywhere, and generally can't figure out what's going wrong or what's different between the sweeps that work and those that don't. I've had this failure on sweeps of different variables--geometry-related and medium-parameter-related. Really need to get this fixed, so I can continue with this work. Of course happy to provide more information and upload more files, but I've started here by attaching the .cfx files as well as the .xml generated by the macro for a sweep of the conductivity value for scattering from an infinite dielectric cylinder. Any help will be greatly appreciated! inf_cyl_pbc_variable_cond_03.cfx inf_cyl_pbc_variable_cond_04.cfx inf_cyl_pbc_variable_cond_original.cfx inf_cyl_pbc_variable_cond.xml inf_cyl_pbc_variable_cond_01.cfx inf_cyl_pbc_variable_cond_02.cfx
  4. Hi Guys, I need to do some micro-Doppler simulations simulations in Feko (of a bird). Unfortunately I can not find a user guide or How to do guide of micro-Doppler simulations. However in literature, some have done so (attached image). How can I perform micro-Doppler simulations in Feko?
  5. Hi, I put the coating (3 mm) on a cube with working at the frequncey 18 GHz, and then Feko reminded me a error and warning. Error 17063: Cube.Face15 - Coating LayeredDielectric1 on Cube.Face15 must be geometrically and electrically thin unless solved using physical optics (PO). Warning 17064: Cube.Face13 - Coating LayeredDielectric1 on Cube.Face13 is not geometrically thin. Thus, how to solve the problem and can Feko solve the coating problems? Thanks.
  6. Hi guys, I want to learn to simulate the RCS for different polarisations, VV, HH, VH, HV. I understand the example stated out in the example guide - however, it does not explicitly state how to go about for the four polarisations. How do we go about simulating the RCS for the four polarisations? Nyasha
  7. 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
  8. When I run my model with the default solver (I guess it is MOM), I get an error which says "ERROR 33238: Not enough memory available on the hard disk for an out-of-core file" though I already have 8 GB of RAM and more than 200 GB of free HDD space. However, when I switch to FDTD solver, it doesn't show up the error, but it takes a really really long time. I have attached the model to this post. Please help me what to do with this error as I haven't found any good solutions yet. 08262019_Feko_two_blades.fek
  9. I want to import a stp file in Feko but I can see all options in grey at import > Geometry. How can I fix this? I have tried all possible formats for importing it but in all of them I have mesh related issues. Please help!
  10. Hi, I have plotted data in POSTFEKO with API scripting, but I do not know how I can export each graph as a .dat file. Can someone help me with that? And is there a macro recording option for POSTFEKO, because I could not find it. Thanks in advance! With kind regards, Meerten Lua_example_post.lua
  11. Hi, I am a new user of FEKO. At present, I am doing two-port impedance matching network designs for a power amplifier in ADS based on lumped elements. The input signal frequency can vary from 20 MHz to 200 MHz. Is it possible to do lumped element based impedance matching network in FEKO where one of the ports has complex impedance? Thanks in advance. Regards A N M Wasekul Azad University of Missouri-Kansas City
  12. Hi guys, I have an arbitrary target and I need to visualise the RCS intensity - as shown in the attached image - (From EMSSFEKO YouTube channel). I tried looking for steps from the Feko help document but I couldnt find the RCS visualisation steps. What are the detailed steps involved from importing the CAD model to visualising its RCS signature? Regards, Farai
  13. Hello ! I am get this warning while trying to simulate a structure within feko WARNING 37591: Non-radiating characteristic modes were removed do you have any explanation to this warning ?! Thank you!
  14. hi everyones I try to simulate an antenna but I confront an error: error33238:Not enough memory available on the hard disk for an out-of-core file. in addition it has a warning by contents: warning 1663:Inhomogeneous segmentation for triangles. I use edge port to excite a quadridged horn antenna with coaxial cable. thanks in advanced.
  15. Hello, Could anyone please answer whether there is an option in FEKO for performing batch simulations. In case if such an option is available in FEKO, can anyone guide me.
  16. Could someone specify the format for the external ASCII file when loading radiation pattern data into the AR Card in EDITFEKO? I am aware of the documentation but would appreciate a clearer example of the format. Thankyou
  17. Hi, I am trying to export Y-parameters of an array which includes 16 elements, hence, 16 ports. I want to create a .y16p file but every time I try to export POSTFEKO crashes and is not responding. I know it is a lot of data to export, but is there any other way to get Zparameter data? Thanks in advance!
  18. Hi friends ! I want to do Log Periodic Dipole Array Antenna Example but i get the error in sigmaN function veriable when entering veriables. tau:0.93 (entered) sigma0: 0.7 (entered) sigma1...sigma11: sigmaN=sigma(N-1)/tau ( ı did not do this function) how ı enter this veriable ? Thanks in advance !
  19. I have noticed that FEKO (SE) shows surface currents at the boundary between different epsilon_r regions. Could someone explain this effect please? description in detail: A dielectric plate is placed inside a conductive cavity resonator. There are two seperate regions inside with different dielectric constant (eps_r=eps_0 & eps_r=2.2). At the resonant frequency of a low order mode the surface current is displayed using postfeko. They are shown at the conductive walls, which is quite clear, but also at the dielectric boundary shell. Why is there a surface current present at this kind of boundery, a dielectric boundery? Is this some kind of: 1. displacement currens 2. manifestations of the ExH field on the surface at that position and because of the surface mesh at the boundery 3. based on the implementation of the BEM, MoM / boundery conditions 4. somewhat else Thanks
  20. Hi, I am new in Feko, can anyone here provide me a tutorial how to design an array microstrip antenna? because i couldnt find any tutorial on designing array microstrip antenna. Thank you for anyone that provide me tutorials.
  21. Hello, I would need some clarification to enable me understand what I am doing on FEKO. I am relatively new to using FEKO but I am having a hard time understanding some terminology. 1. What is the difference between MoM matrix and MoM impedance matrix. If there is a difference, how to I obtain the MoM impedance matrix on FEKO else I guess they are both the same. 2. What is the major difference between the surface current, current density vector and eigen-current. How do I obtain the eigen current on FEKO 3. The MoM matrix does not tend to match in terms of dimension with the current density vector on FEKO, how can I reconcile this
  22. Hello guys, I studding the deformation of a structure (plane) in HyperMesh (with the Optistruct tool ), so after having the deformation in HyperView I want to export is to Feko to do an electromagnetic simulation. How can I do the exportation from HyperView to Feko? And witch extension type of file I have to export from HyperView to Feko to have a geometry in Feko and not a mesh. Here you have the "*.hm" file that I am studying attached. Thank you for your help. Regards, Samir. direct_response_flat_plate.hm
  23. Greetings, I'm having a little trouble with simulating jobs remotely, specifically using the front-end on Windows pre-process and then remote solving on a Linux machine. I have setup ssh with passwordless login and confirmed that it works between my two machines. Next, I try launching from the gui with the appropriate Component launch options set on the FEKO Solver tab, but no joy. I then open a Feko terminal and put the particulars on the command line as follows: C:\Users\user1\projects\fy19\antenna_lib\ant01>runfeko ant05l_matched2 --remote-host 192.168.1.11 -np 12 --machines-file C:\Users\user1\AppData\Roaming\feko\2018.0_caf82d78\machines.feko --parallel-authenticate default and get the following response in the terminal: C:\Users\user1\projects\fy19\antenna_lib\ant01>runfeko ant05l_matched2 --remot e-host 192.168.1.11 -np 12 --machines-file C:\Users\user1\AppData\Roaming\ feko\2018.0_caf82d78\machines.feko --parallel-authenticate default Altair Feko - RUNFEKO Version 2018.2.1-12 from 2018-10-19 Copyright (c) 1999-2014 Altair Development S.A. (Pty) Ltd Copyright (c) 2014-2018 Altair Engineering, Inc. NOTE: Running PREFEKO locally since using remote launching Altair Feko - PREFEKO Version 2018.2.1-63 from 2018-12-07 Copyright (c) 1999-2014 Altair Development S.A. (Pty) Ltd Copyright (c) 2014-2018 Altair Engineering, Inc. Creating file ant05l_matched2.fek, please be patient ... File ant05l_matched2.fek has been created: 1 metallic wire segments in free space (of which 1 are curvilinear) 388 metallic triangles in free space Altair Feko - ADAPTFEKO Version 2018.2.1-15 from 2018-10-12 Copyright (c) 1999-2014 Altair Development S.A. (Pty) Ltd Copyright (c) 2014-2018 Altair Engineering, Inc. Altair Feko - PREFEKO Version 2018.2.1-63 from 2018-12-07 Copyright (c) 1999-2014 Altair Development S.A. (Pty) Ltd Copyright (c) 2014-2018 Altair Engineering, Inc. Creating file ant05l_matched2.fek, please be patient ... File ant05l_matched2.fek has been created: 1 metallic wire segments in free space (of which 1 are curvilinear) 388 metallic triangles in free space --------------------------------------------------------------- ADAPTFEKO frequency analysis band no. 1 of 1 ADAPTFEKO analysis no. 1 (max. 75) at frequency 5.00000e+07 Hz Completed subintervals: 0.0% --------------------------------------------------------------- Altair Feko - RUNFEKO Version 2018.2.1-12 from 2018-10-19 Copyright (c) 1999-2014 Altair Development S.A. (Pty) Ltd Copyright (c) 2014-2018 Altair Engineering, Inc. NOTE: Running PREFEKO since file "ant05l_matched2_fr_1_ada_1.fek" not found Altair Feko - PREFEKO Version 2018.2.1-63 from 2018-12-07 Copyright (c) 1999-2014 Altair Development S.A. (Pty) Ltd Copyright (c) 2014-2018 Altair Engineering, Inc. Creating file ant05l_matched2_fr_1_ada_1.fek, please be patient ... File ant05l_matched2_fr_1_ada_1.fek has been created: 1 metallic wire segments in free space (of which 1 are curvilinear) 388 metallic triangles in free space Launching of the job remotely on the host "192.168.1.11" Copying files to remote host ... Altair Feko - RUNFEKO Version 2018.2.1-12 from 2018-10-19 Copyright (c) 1999-2014 Altair Development S.A. (Pty) Ltd Copyright (c) 2014-2018 Altair Engineering, Inc. Host key verification failed. Warning: List of hostnames not found. - Temporary directories on nodes not delet ed. ERROR 20032: Error opening the source file "ant05l_matched2_fr_1_ada_1.out" for copying. C:\Users\user1\projects\fy19\antenna_lib\ant01> Any suggestions on how to overcome this error and get this model solved remotely? Thanks. v/r, DLH
  24. Hi, I have a 4by4 symmetrical phased array, but something strange is happening with my S-parameters. Because my array is symmetrical, the following should approximately be the same: S11=S1616, S21 = S1516 etc. However, when I look in my .s16p file, S1516 is -180 degrees shifted in phase with respect to S21. What causes this shift? Thanks in advance! MWA_tile_sur_v3.cfx MWA_tile_sur_v3.cfx.bak MWA_tile_sur_v3.fek MWA_tile_sur_v3.opt MWA_tile_sur_v3.out MWA_tile_sur_v3.pfg MWA_tile_sur_v3.pre MWA_tile_sur_v3.str MWA_tile_sur_v3_SParameter1.s16p MWA_tile_sur_v3.bof MWA_tile_sur_v3.cfm MWA_tile_sur_v3.cfs
  25. Hi expert Feko, I would like to ask FEKO team about the warning that I received when I have tried to simulate my dipole antenna using wire port. What does the warning mean so that I can make improvements to my model to achieve the results? Thank you, attach is the warning message.
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