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Thread: Cross polarized antenna modeling in Atoll

  1. #11
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    Default Re: Cross polarized antenna modeling in Atoll

    Watch these two files carefully. You will see a difference.
    P45_M45.jpg
    BR Slava

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    Default Re: Cross polarized antenna modeling in Atoll

    for CDMA case i suggest you can average out each azimuth values in antenna file

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    Default Re: Cross polarized antenna modeling in Atoll

    Hi!
    You can use the special Antenna Pattern Editor program to analyze the antenna pattern in .msi format.
    Download the Antenna Pattern Editor download link here:
    https://mega.nz/#!ofx1TChY!qbuKCKrsw...hm-0NJnJVDxQUA
    BR Slava

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    Default Re: Cross polarized antenna modeling in Atoll

    Hi!
    In my opinion, there are two reasons why you can take any of the 2 patterns + or-45 deg :
    1.The difference between gain is usually less than 1.5 dB. in this case, the accuracy of the propagation model is usually more than 6...8 dB. Therefore, the error in the pattern will not be visible
    2. There is no guarantee that the jumpers were not mixed up when installing the antenna. And instead of + 45, it works -45.

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    Default Re: Cross polarized antenna modeling in Atoll

    Although , I couldn't open the .jpg due to my finetopix user privileges limitation , but it is clear from your explanation that the radiation pattern is not the same for M45 and P45 .

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    Default Re: Cross polarized antenna modeling in Atoll

    Hi!
    Download and install the Antenna Pattern Editor. You can see the beam patterns for your case in the Antenna Pattern Editor and see the difference.
    BR Slava

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    Default Re: Cross polarized antenna modeling in Atoll

    Hi,

    As somebody already mentioned earlier, you will not find ideal 100% perfect antennas. It's normal to have small deviations in pattern files due to some physical effects (temperature, manufacturing process, precision, physical array position in multiband antennas, etc). And as far as I know modelling X-pol (+45° & -45°) antenna by using both pattern is not possible in atoll.

    However you could superpose both pattern and create a new pattern file withe the antenna envelope! But is it worth the work.. I don't think so.

    Some of the antennas I use in my network have more than 2k pattern files, from my point of view it's just not justified and worth to implement them all.

    Best practice is to implement only what is really needed: give your self a rule and implement what is necessary.
    - choose one polarisation type e.g. M45 or P45
    - choose one frequency per band. e.g. center freq, upper or lower freq.
    - implement only one array or every array
    - implement every e.tilt position, or only min e.tilt (and simulate real tilt position via mec.tilt setting)

    This approach will make your work much easier.

    pathloss

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    Default Re: Cross polarized antenna modeling in Atoll

    Thanks Slava121, agree with you.

    I personally do not see there is any argument needed for difference between two polarization angle, as they are naturally different, and is also the reason why antenna vendor provides the two antenna pattern separately.

    Untitled.jpg

    The question here is really, does Atoll support cross-polarization antenna modelling? And if yes, how to do it. If no, then what is the compromised way/workaround.


    Quote Originally Posted by slava121 View Post
    Watch these two files carefully. You will see a difference.
    P45_M45.jpg

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  14. #19
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    Default Re: Cross polarized antenna modeling in Atoll

    it is necessary to check.
    BR Slava

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    Default Re: Cross polarized antenna modeling in Atoll

    Quote Originally Posted by pathloss View Post
    Hi,

    As somebody already mentioned earlier, you will not find ideal 100% perfect antennas. It's normal to have small deviations in pattern files due to some physical effects (temperature, manufacturing process, precision, physical array position in multiband antennas, etc). And as far as I know modelling X-pol (+45° & -45°) antenna by using both pattern is not possible in atoll.

    However you could superpose both pattern and create a new pattern file withe the antenna envelope! But is it worth the work.. I don't think so.

    Some of the antennas I use in my network have more than 2k pattern files, from my point of view it's just not justified and worth to implement them all.

    Best practice is to implement only what is really needed: give your self a rule and implement what is necessary.
    - choose one polarisation type e.g. M45 or P45
    - choose one frequency per band. e.g. center freq, upper or lower freq.
    - implement only one array or every array
    - implement every e.tilt position, or only min e.tilt (and simulate real tilt position via mec.tilt setting)

    This approach will make your work much easier.

    pathloss
    Thank you so much Pathloss for clarification and recommendations

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