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16th January 2010 at 09:25 #60743RubelGuest
Can any one pls help me which polarization is good in the rain zone and why?
Rubel16th January 2010 at 21:09 #60744PixGuest
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 🙂18th January 2010 at 05:29 #60745PrabeenGuest
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.18th January 2010 at 06:50 #60746PixGuest
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 😉
Open this URL, interesting investigation of rain vs radio propagation :
pix18th January 2010 at 14:39 #60747ParasGuest
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.20th January 2010 at 09:22 #60748AliAsgherGuest
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)20th January 2010 at 15:37 #60749PixGuest
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.
-pix21st January 2010 at 07:45 #60750AliAsgherGuest
Thanks Pix. :)Seems I forgot a decimal in my below post.