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Community May 2026 Roundup 📣
🌟 Altair Community Update: Events, Highlights & What’s New Hello Altair Community! Welcome to this month’s community roundup—your go-to source for the latest discussions, expert insights, and standout solutions. Whether you're here to troubleshoot a challenge, discover new techniques, or stay up to date on trending topics,…
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How to copute the RCS of an infinite long dielectric cylinder?
Hi, I would like to know how to compute the 2D RCS (scattering width) of an infinitely long dielectric cylinder in FEKO. The official example for an infinitely long PEC cylinder removes the top and bottom faces before applying a 1D Periodic Boundary Condition. Should the same procedure be followed for a dielectric…
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Student License Mismatch: Error Code 9 Feature Not Found (HWFEKOGUI)
Hello, I am a student using a university account profile. I have activated my Student Edition using my Activation Key via the License Utility, but the software fails to launch with 'Error Code 9: Feature Not Found (HWFEKOGUI)'. My current license text blocks entirely lack the Feko module flags. Could an Altair…
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newFASANT for FEKO 2026.1
hi please can you inform me if there is appropriate newFASANT installer for the last FEKO 2026.1 kind regards Mitsos
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Unable to open FEKO anymore
Description: Hello, I've been successfully using a FEKO student license since May and it has been working without issue. However, recently, the program stopped running and I received the error detailed below. I had this error earlier while trying to install the program and was able to do it after staff had deactivated and…
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Electrically short HF Monopole - high nearfield result
Hi, I am simulating a monopole to see the electric field at 3m away with the following parameters; 8m long and 0.08m diameter, frequency range 2Mhz to 30Mhz, power 100W, 5dBi gain Approaching the low frequency end ~2Mhz the electric field strength increases significantly. ~ 600 V/m Using hand-calc approximation for…
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How to use optimization mask in FEKO
Hello, I have a couple of questions regarding optimization mask in FEKO. In optimization mask, there are X and Y. Recently, I have watched the video in the following link: https://youtu.be/AxjK4xUl-pM?si=jJZl1ZErpoVoeZuF Where the engineer specified some specific frequencies and s-parameters in X and Y columns,…
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Use SSH FEKO
Hello, I am trying to run FEKO on a server and have two questions : Is it possible to run FEKO simulation on a distant server without having FEKO installed there ? For example, a SSH call need FEKO on the distant machine. I was wondering then if there was an option with MPI or so allowing to execute the simulation on a…
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Student License "Error activating license:This lic. was already activated using different HostIDs"
I startet evaluating Feko yesterday, especially its LUA scripting capabilities. After some hours of scripting, I run into license problems. As it seemed I had some zombie Feko processes running, I tried killing all Feko processes without success. Rebooting did not help as well. Consequently, I checked the license storage…
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What is the recommended way to feed a dipole antenna with a physical gap in Altair Feko when the d
In my model, the dipole is made of cylindrical PEC/metal parts separated by a small gap. I would like to excite the antenna across this gap and obtain reliable input impedance, current distribution, and radiated power results. Should I use a discrete/edge port directly between the two cylindrical faces, a small feeding…
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FEKO .ffe antenna pattern import into WinProp - incorrect power results compared to omnidirectional
Hi, I'm trying to import a 2x2 patch antenna pattern from FEKO (POSTFEKO v2025.1) into WinProp (ProMan) as a .ffe file, but the results are incorrect. Situation: In FEKO/POSTFEKO, the main beam is pointing in the Z-axis direction (upward), with a Total Gain of about 13-17 dBi I exported the far field as a 3D_pattern .ffe…
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Claude AI with FEKO
I have a model for a large platform such as Gulfstream aircraft. I have an antenna on the fuselage. I want Claude to keep moving antenna along fuselage. The problem is the antenna coordinates is not in any files that are easily readable text and same for aircraft geometry. Is there any way around it, is there MCP server i…
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file size increasing by 30MB every save
i have FEKO 2026. i have a very large model of gulfstream aircraft. the file size is 30MB. if i add simple geometry like a single wire and save the file size increases by 30MB, basically doubling. then if i add another wire and save the file size becomes 90MB. so every time i change geometry FEKO adds 30MB. what do you…
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CADFeko very slow at responding to mouse commands
Hello, I'm brand new to Feko, and I wanted to try it out. However I haven't managed to run a simulation because the CAD visualization isn't working. It takes on the order of 5 seconds for my mouse inputs to be registered. Bare in mind, my current CAD geometry is a single cube with a FEM model source. Why is it so slow? I…
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Reactivate suspended Student Edition account – d.ramirezr@uniandes.edu.co
Hello Altair Academic Support Team, I am requesting the reactivation of a suspended Altair Student Edition account. I am a graduate student at Universidad de los Andes (Colombia), and I originally obtained a free Student Edition license (Feko) using my institutional email: d.ramirezr@uniandes.edu.co That account is now…
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Issue running simulation
Hi, I created a slot antenna in Feko and am having trouble running it. What do I do? This is the message I get: NOTE: Running PREFEKO since file "slot_antenna.fek" not found Altair Feko - PREFEKO Version 2026-5018 from 2025-11-24 [Release/2026.0.0 @3b0d124c5395 ] Copyright (c) 1999-2014 Altair Engineering (Pty) Ltd…
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AR optimization config
Hello, i wanted to make sure my setup for AR and S11 optimization of microstrip antenna is proper. I want to optimize my structure by optimizing 2 parameters, my goals are set as: S11 less than 15dB AR<3dB RHCP
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Request for help with Student License
Hi, I am a masters student at Texas A&M University. I want to try out FEKO as part of my thesis, and wanted to use the student license. However, I keep getting errors whenever I run it. The license file I got looks like it doesn't include FEKO. How do I get around this? I also can't find the "altair_lic.dat" file.
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CADFEKO critical error pk_error_tag_limit_exceeded when creating many unit cells via Lua macro
Hi, I am using a Lua macro in CADFEKO to programmatically generate a large periodic structure for multiport analysis. The geometry creation involves operations such as creating patches, vias, and assigning edge ports. The script works correctly for smaller models, but when the total model becomes sufficiently large,…
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Can I simulate the band at 7 GHz in WinProp - workaround for FR1/FR2 validation error?
Hello, I am running coverage simulations in WinProp / ProMan for a master's thesis on multi-band cellular planning. My current scenario includes three bands working correctly: LTE B8 (950 MHz), LTE B1 (2160 MHz), and NR n77 (3525 MHz). I now want to add a fourth band at 7 GHz, corresponding to the IMT-2030 candidate range…
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FEKO SCRIPTING INTERFACE
I am trying to run scripts on feko scripting interface and nothing happens. Can someone kindly assist on how to go about it?
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Is there any way to simulate an infinitely periodic ground with a single antenna.
Description: I am trying to simulate a single antenna above an in-homogeneous soil. Currently I have an antenna placed above a checkerboard of solid blocks of soil, and I want to tile this out to infinity. When trying to implement infinite periodic boundary conditions, or expanding it as an array, the system always tiles…
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Verify Shunt Capacitor Sweep Setup in FEKO
I'm looking to plot S-Parameters for the purpose of extracting capacitance values throughout a frequency sweep. I am able to run the simulation, plot S-parameters and export the SnP file, but here are the issues: Either the capacitance is about twice what it should be, or this shunt capacitor electrically looks like a…
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Constant Errors Regarding Twisted Pair Wires
Hello, I am using a twisted pair wire with the following values: Metric Value Core Radius 0.000335 Insulation Layer Thickness 0.0009 Twisted Pair Radius 0.0025 Twisted Pair Length 0.003 This shows no errors, but when I try to run Feko Solver I get: ERROR 53993: Twisted pair: expecting a twist pitch length that would result…
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Cannot Add Current Source to Model
Hello. I am trying to model the coupling between two wires running parallel on Feko v2025.1. I have been following the EMI/EMC learning series using Altair Feko Example 1-3 YouTube series, as well as EMI/EMC learning series using Altair Feko Example 4 Shielded Cable Crosstalk, as best I can. But for most of the model's…