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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 


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  1. Hello, I would like to learn the .lua script of the MIMO Performance Evaluation for the calculation of envelope correlation coefficient (ECC). What does "intFactor" and "Gainfactor" exactly stand for and how does the algorithm work to calculate ECC? Thanks.
  2. CPW-fed patch antenna

    Hi, You can use the edge port as i illustrated in the figure.
  3. Question about .mat file generated by FEKO

    Hello, Using the attached utilities, it shows only one MoM matrix for a single frequency. Is there a way to display all MoM matrices calculated within a frequency range? Thanks
  4. Hi, Using characteristic mode configuration, one can obtain eigenvalues, modal significance, etc. I would like to know if the corresponding eigenvector values can be exported and read. Thanks.
  5. Interpretation of the Near Field

    Hi JIF, I have attached a model in which near field and the reflection coefficient are calculated at a distance of 10 wavelengths. Although the round trip phase shift should also be a multiple of 2*pi, there is a 180 degrees phase difference between the near field and the reflection coefficient results. I would greatly appreciate it if you explain its reason. Thanks. reflectarray.rar
  6. Interpretation of the Near Field

    Hi JIF, Thank you for your response. As Johan suggested, selecting the "Calculate only the scattered part of the field" option yields only the reflected field, thus its amplitude is in accordance with the reflection coefficient. However I am more interested in finding the reflection phase but the phase of the reflected field and the phase of the reflection coefficient have different values. The reason of my interest in obtaining the reflection coefficient from the reflected field is to compute the modal components of the reflection coefficient. Since adding transmission/reflection request to the characteristic mode configuration is not supported, utilizing the information of the modal reflected fields seems like the only option for the computation of the modal reflection coefficients. Besides that, although characteristic mode analysis is supported for models with periodic boundary conditions in FEKO 7.0, it is not supported anymore in FEKO 14.0, unless I am missing something. A similar work has also been done in http://ieeexplore.ieee.org/document/7695921/. Thanks.
  7. Interpretation of the Near Field

    Hi, I would like to know how we can relate near field solutions and reflection coefficients in the simulations of periodic structures. When I simulate the Jerusalem cross FSS model in the example guide, near field results above the structure are always greater than the incident field (which is 1 V/m). Moreover, when the reflection coefficients are requested on the plane positioned above the structure where near field results are calculated, there is no correlation between near field results and reflection coefficient results when they are plotted as a function of frequency. Since the reflection coefficient is basically Er/Ei, how should we interpret near field results and Er? Thanks.
  8. Extracting MoM Matrix

    I would like to know if there is a way to obtain MoM impedance matrix in 14.0. Thanks.