Expert: Cezar L. Palconet - 10/13/2010

Question
Hi Cezar,

Thank you very much for your answer, which  clearly explained ratio of channels.
But I am still confused.Let me put my previous question this way:
L band( center freq @~1.5GHz)  has a bandwith of ~ 1GHz, C band(cf@~5GHZ)a bw of ~2GHz,and Ku (cf@~15GHz) a bw of ~6GHz, and Ka band (cf@~33GHz) a bw of ~14GHz.
We can see, the bandwtidth goes wider while the bands' center freq goes higher.
My question is :
who defined these L, C, Ku, Ka band, and why the higher, the wider?

Best regards
J.C

Answer
Hi, James

While most of the bands that you mentioned as examples, involves the space service, and the satellite service are by in large DAMA systems that have flexible bandwidth use (as per transmission requirements), most of the time the bandwidths that are assigned are much larger than the necessary bandwidth of the actual transmission, the authority that recommends the bands and the amount of spectrum per channels are the ITU-R, they provide the recommendations on spectrum use,and its coordination between different regions of the world, this more pronounced in practice specially in the space services assignments.

More info on the subject, are available at the ITU web site and its various publications and recommendations.

Best regards.