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Comments(6)
NAEEM UL HAQUE on:Sun Apr 11, 2010
 Nice but the question is that data rate depends on frequency. so how could such high data rate be achieved through such a low frequency. what would be its standard.

 
Moiz on:Tue Apr 13, 2010
 u have written 60Hz up there, please correct it!

 
Moiz on:Tue Apr 13, 2010
 u have written 60Hz up there, please correct it!

 
Unaiza Ahsan on:Tue Apr 13, 2010
 Hi there. @Naeem ul Haque The frequency is actually 60 GHz - there has been a typo there, sorry. At this extremely high frequency, there is no question of long-haul communication (over huge distances). The range is therefore very short, within a room. And at THIS range, near-fibre-optic speeds can be achieved, as was tested by the WiGig Alliance. Hope this is clear now :) @Moiz Thanks for pointing it out :). The typo will be corrected very soon, IA.

 
Type Your Name on:Fri May 21, 2010
 Nice...And nice use of 60-GHz-Sever-Attenuation... One thing... A quantum of electromagnetic radiation has the energy that is proportional to the frequency... A ripple in a quiet pool of water should travel more if it carries more energy...Water being the medium... So, what were your thinking parameters when you regarded a high-frequency radiation as incapable of traveling to longer distances? I know this is a stupid question, but I hope you won't say it explicitly.

 
Unaiza Ahsan on:Fri May 21, 2010
 Thank you for the question :). Every query is welcome actually because it makes one think and reflect and then answer The point you made about a ripple of water travelling more in a still pool of water is valid. But for water waves. The electromagnetic waves follow the inverse square law, where the distance they can travel is inversely proportional to their signal strength. So a lower frequency wave will have greater signal strength and will be able to travel further. And they do too. Another factor is that the medium that EM waves travel through also affect their propagation characteristics. So low frequency waves are attenuated less than higher ones. Again, this leads to high frequency waves travelling shorter distances. Also, the high frequency wave is more absorbed or scattered compared to the low frequency one, hence for short-range wireless communication, very high frequency waves are used. And finally, yep you are right. E = hf (basic formula for energy content of the wave being directly proportional to its frequency). But in EM waves, having a higher energy isn't the sole factor in propagation... other factors like medium, scatter etc play a role too and THUS the general observation they travel shorter distances.

 
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