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Torben Voigt

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Posts posted by Torben Voigt


  1. Hi tejasw,

     

    Could you please check if you can open it by double-clicking. When double-clicking a *.fek or a *.bof file POSTFEKO should open. I assume that the simulation of at least this model failed. You would also see error messgages in the related out file in that case. The Parameter Sweep: Combine Phase tool can only work with models that succesfully finished.


  2. Hi tejaswi,

     

    The 'parameter sweep:combine phase' script tries to load models (*.bof and *.fek files) into the session, which are specified in the *.xml file. The error message says that coupling_lua_new_freq_01.bof' can't be opened. Could you please check if this file exists and if you can open it by double-clicking. By default the parameter script stores the models and additional files in a subfolder called parameter_sweep. Look there first.


  3. Hi sem,

     

    I'm not sure why you expect the ff_VN far field to be symmetric? The model is not symmetric to the VN plane, and as Johan Huysman already mentioned, the (strong) currents in the feed lines contribute to the far field radiation:

     

    image.png.25472d0643566ec9edeb5602f9651a5a.png

     

    You may specify which faces contribute to a far field by using Scope in the far field diaogue. Here, only the patches are taken into acount:

    image.png.477575d77df058508c353a479d5025e8.png

     

    Now the patterns are almost symmetric. Of course still the position of the feedlines disturbs.

    image.thumb.png.caa98a14ef71f1974087eee3667f3f4f.png


  4. Hi tejaswi,

     

    The pics/graphs in your pdf do all come from a StandardConfiguration.

    • Figure 1: 3D view - FarField - Gain [dB]
      image.png.ea92c332fe4794c08d6f493e935b90bf.png
    • Figure 2: VoltageSource - Reflection- dB
      image.png.a1fca2276e6d1b3c30f03d128ad00a43.png
    • Figure 3: VoltageSource - VSWR - dB
      image.png.612cf2f07e1784e2589242af6e0f6d83.png

    If I understand correctly you want Reflection coeficient and VSWR for both antennas while one is active and one is passive. For this you would create two StandardConfigurations. One with port 1 excited and port 2 loaded and one vice versa.

     

     


  5. Hi tejaswi,

     

    Maybe a SParameterConfiguration in CADFEKO is what you're looking for? It'll take care of exciting ports while terminating others. Multiple different configurations can be set in one model, e.g. SParameterConfiguration for S11 ... S22 and a StandardConfiguration for the radiated far field of two active antennas.

    image.png.90c7570700c245069a53fb8d22d52ff6.png

    Note, you can set  Frequency, sources, loads and power to be per configuration instead of global. This allows you to e.g. calculate the s-parameters for a wide frequency range while calculating the far field only for single frequencies.

    image.png.b13c9dce8149065bc986c6b35c301ea7.png

    UserExample B.1 Antenna Coupling on an Electrically Large Object may get you going.


  6. Hi FieldForcer,

     

    There are only two faulty faces in your model. I copied them and deleted them from the original part. After unioning the faces and the origibnal part again the part is fault-free.

    image.png.a820f7dba913860c2c5195bb1d1054d8.png

    The model can be downloaded here: https://securefiletransfer.altair.de/link/ZHfgEDvz7uVl9n1IK83Fm8

     

    PS: In the file you uploaded a 3.2 GByte (!) out file was included, which obviously does not belong to the model.


  7. Hello Professor Hussain Al-Rizzo,

     

    I was only concentrating on the creation of the infinite structure like shown in Hi_imp_sievenpiper.pdf

    image.png.dd63b8c65ca9f3ee5b0a5d964b4bf482.png

     

    Regarding the option of dispersion diagrams of infinite (Periodic Boundary Condition) structures in FEKO, there is a feature request under discussion. This feature request was originally started from an email from you to FEKO Support in November 2012 :) I will in any case keep you updated if there are good news for you.

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