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Which is the best polarization?

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  • #60743 Reply
    Rubel
    Guest

    Dear,

    Can any one pls help me which polarization is good in the rain zone and why?

    Regards
    Rubel

    #60744 Reply
    Pix
    Guest

    Rubel,

    I’ve never read anything about a polarization that works better under the rain, but someone else knows perhaps better than i do.

    Rain drops are spherical, so they offer the same shape whichever angle you look at it 🙂

    #60745 Reply
    Prabeen
    Guest

    Hey Pix,

    Might be rain DROPS are spherical. But not a heavy rain dude. N thats y they calculate intensity of rain in centimeters n not in radius. Am i right????

    Polarization – Hmmm i dont think there is a relation between polarization and rain. A cross polarized antenna is much preferred. Wild guess.

    #60746 Reply
    Pix
    Guest

    Prabeen,

    Your explanation doesn’t make any sense at all, so I assume it is a joke ??

    When you talk about rain intensity measurement in “centimeters”, you know that the cm (or mm, usually) just refer to the height of water that falled onto the ground… not the actual size of the rain drops.

    Imagine a rain drop of 5cm, you could drown in that ! Or at least lost an eye…
    And finally… just for the sake of it : radius can be measured in cm 😉

    Rubel,

    Open this URL, interesting investigation of rain vs radio propagation :

    nopr.niscair.res.in/bitstream/123456789/4711/1/IJRSP%2036(6)%20502-513.pdf

    best regards,
    pix

    #60747 Reply
    Paras
    Guest

    Best polarisation in rain is Vertical.

    fading due to rain drops is lesser in V pol than in H pol coz in H pol electromagnetic waves travels horizontally and rain drops falls on it fades the signal.

    #60748 Reply
    AliAsgher
    Guest

    Limiting my discussion to GSM only, say till GSM1900 frequencies, the wavelength is still large enough (~157 cm) to be affected by a rain drop.

    For higher frequency bands (in the range 10GHz or higher, the link posted by Pix seems good)

    #60749 Reply
    Pix
    Guest

    Ali,

    Wavelength for GSM900 is 32cm !
    16.7cm for DCS1800

    For GSM, experiments show an attenuation of around 3dB when there is heavy rain.
    But they don’t mention polarization.

    -pix

    #60750 Reply
    AliAsgher
    Guest

    Thanks Pix. :)Seems I forgot a decimal in my below post.

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