There are many things facing satellite communication in the c-band which effect on the system performance efficiency.
Dear Colleague Hisham,
There is already geosynchronous communication satellites operating in the C-Band with the uplink frequency of 6GHz and the down link frequency of 4GHz. In such frequencies the path loss high but it is still smaller than the satellites operating in the higher bands such as the Ku-Band.
It is so that the path loss is proportional to the the square of the frequency.
There is additional path losses due air mass of the earth which can attenuate the microwave frequencies such as rain and fog. One has to choose the frequencies which suffer from the additional path loss by the air mass. I think the selection of the 4 and 6 GHz is guided by this concept in addition to the ease of electronic implementation of the transmitter and receiver.
Concerning the antenna size, it decreases with the increase in the frequency. So, at such C.Band frequencies the size of Antennas will be appreciably larger than that for the Ku-Band to obtain the same antenna gain. So, this may be a major disadvantage of using the C-Band versus the Ku-Band
Best wishes
C-band received signal is very weak due to the long distance from GSO to earth. Thus it is very vulnerable to interference coming from Fixed Wireless Access FWA services operating in the same or adjacent frequency bands (c-band 3.4-3.8GHz; or extended C-band 3.8-4.2GHz).
Check the following research papers covering this issue:
Article Review Ongoing Research of Several Countries on the Interfer...
and;
Presentation My PhD VIVA slides Presentation in 2011, about: Coexistence ...
and;
Conference Paper Novel computation of expecting interference between FSS and ...
and;
Article Broad-Spectrum Model for Sharing Analysis between IMT- Advan...
With my best wishes
The problems associated with satellite communication are high propagation delay, low bandwidths as compared to terrestrial media, and noise due to the effect of rain and atmospheric disturbances. The large propagation delay in satellite networks poses problems for voice communication.
C-band received signal is very weak due to the long distance from GSO to earth. Thus it is very vulnerable to interference coming from Fixed Wireless Access FWA services operating in the same or adjacent frequency bands (c-band 3.4-3.8GHz; or extended C-band 3.8-4.2GHz).
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