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Found 48 results

  1. Hello, I'm performing a convergence study on the attached model. The idea is to run multiple simulations for the same model using different mesh sizes, and then determine the appropriate mesh size for this model to guarantee accurate S-parameter results. The simulations were performed using custom meshing for 3.5 mm, 2.5 mm, 1.5 mm, 1.0 mm, 0.5 mm in all of these trials the S-parameter plots were different. Thank you. H_pln1.cfx
  2. Dear All, I have an issue concerning the use of “Double NeGative” (DNG) metamaterials. The issue regards either the electromagnetic scattering of plane waves from DNG metamaterial cylinders or the evaluation of the reflection coefficient for waveguides partially filled with metamaterials. I firstly considered an indefinite (along the z axis), homogeneous cylinder having radius = 4lambda in the case of normally incident plane wave with TM polarization at f = 300MHz (see Fig. 1 in attached files). The cylinder is filled up with a DNG metamaterial having eps_r= -2.2, while mu_r<0 changes from case to case. An indefinite cylinder has been obtained with periodic boundary conditions. The result from FEKO is compared with a cylindrical wave expansion (see “Normal Incidence Plane Wave Scattering by Conducting Circular Cylinder: TMzPolarization” – Advanced Engineering Electromagnetic, Constantine A. Balanis). FEKO and the cylindrical wave expansion agree for mu_r =-1 (see Fig. 2) and for mu_r = -1.2 (see Fig. 3), while they disagree for mu_r= -1.3 and mu_r = -1.5 (see Fig. 4 and Fig. 5). Please, find attached the related .cfx file and relative figures. In the second case, I considered an X-band rectangular waveguide structure (see Fig.6) partially filled with a DNG metamaterial, now with epr_r = -2 and mu_r<0 changing from case to case, and terminated with a short circuit. The result from FEKO has been compared with waveguide theory. While for mu_r from -1 to -1.2 the reflection coefficient is ok, for mu_r = -1.5 (or in general lower than mu_r=-1.3) the phases of the numerical and analytical reflection coefficients differ: the numerical phase is -79.7° while the analytical one is -105.1°. Again, the .cfx file is attached. Thank you very much for any help. A_Case1a_metacylinder_DNG_epsr2.2_mur1.cfx A_Case1b_metacylinder_DNG_epsr2.2_mur1.2.cfx A_Case1c_metacylinder_DNG_epsr2.2_mur1.3.cfx A_Case1d_metacylinder_DNG_eps_2.2_mu_1.5.cfx B_Case1a_Rectangular_Waveguide_ partially_filled_memetamaterial_DNG_epsr2_mur1_.cfx B_Case1b_Rectangular_Waveguide_ partially_filled_memetamaterial_DNG_epsr2_mur1.3_.cfx B_Case1c_Rectangular_Waveguide_ partially_filled_memetamaterial_DNG_epsr2_mur12_.cfx B_Case1d_Rectangular_Waveguide_ partially_filled_memetamaterial_DNG_epsr2_mur1.5_.cfx
  3. Is there any option in feko to import far field radiation pattern E theta and E phi? Please help
  4. In the help file it says that "The user can either select a predefined air interface file (*.wst) which is available from AWE Communications for most of the common wireless technologies ", but I cannot find nor download the wst files to use with ProMan
  5. Hello guys, I found some commands on FEKO User Guide to run PREFEKO, make mesh ans run FEKO solver. The commands are (cadfeko_batch; runfeko) and I can run them from DOS (prompt command window on Windows). These commands are interesting because I do not have to open FEKO GUI (Graphical user interface) to make mesh and run the solver, and I can call them from MATLAB. But I am having problems to export from the simulation only Data I want without open POSTFEKO GUI, for example : Transmission and Reflection coefficients and range of frequencies. Does someone have a clue? If I open POSTFEKO and load the simulated file I can export the information as (*.tr) extension, a file with what I want, but I cannot find any information on how to call this kind of "exporting flag" on command line... I do not want to open GUI at all. The image below has one option [--data-export-format n], but on the function description do not have any information about extension (*.tr) Does anyone have an example of a FEKO problem when FEKO did not have GUI? Or some examples of all DOS commands to manipulate FEKO? Thank you in advance. Best Regards, Nikolas Nascimento Aguilar
  6. 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
  7. 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
  8. Hi! can anyone please guide me how to re arrange the trace text, I want mode 1 to appear 1st and then 2nd-5th Regards
  9. 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 !
  10. 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!
  11. Hi Everyone, I am new to FEKO software and using it to design antennas - what I would like to do is export my antennas into an STL or other format to do 3D prints of them. Is anyone able to help me understand the best approach to do this? Thanks, Kelly
  12. 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
  13. Hi, I have problem when I try to solve my fekocad file. This happen ERROR 20103 in line 105 of the file @C:\Program Files\Altair\2018-edu\feko\FEKOenvironment.lua: Non-ASCII character detected! - Undefined behaviour! Someone already had this error in the past? thanks for reply!
  14. 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
  15. 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
  16. 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
  17. 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!
  18. 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.
  19. 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.
  20. 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
  21. 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
  22. 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.
  23. Hi, Hope everybody are good. Please find attached full question with diagrams. A coax-fed patch antenna with dimensions given in table below, is simulated in HFSS, CST and FEKO softwares. It is seen that: The results of the CST software in the case of - The phase Z component of the electric field on the line parallel to y axis and The results of the FEKO software in the case of - The magnitude of X component of the electric field on the line parallel to y axis - The phase of X component of the electric field on the line parallel to y axis - The phase of Z component of the electric field on the line parallel to y axis - The phase of Z component of the electric field on the line parallel to x axis and The results of the HFSS software in the case of - The phase of X component of the electric field on the line parallel to y axis - The phase of Z component of the electric field on the line parallel to y axis are completely different from the results of the two other softwares (despite partial similarity of the field behavior in other cases). The question is why it is such different. Question.pdf
  24. 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
  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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