Please find attached some relevant references:

http://www.moldedfiberglass.com/sites/default/files/docs/MFG_Technical_Design_Guide_FRP_Composite_0.pdf

http://www.siwi.com.cn/en/Products/Antennas/pdf/Parabolic%20Reflector%20Antenna/007-15GHz%20Ku%20Band%20High%20Performance%20Parabolic%20Antenna.pdf

http://link.springer.com/article/10.1186/2251-6832-4-5

http://www.rericjournal.ait.ac.th/index.php/reric/article/viewFile/1119/444

http://ap-s.ei.tuat.ac.jp/isapx/2011/pdf/[WeA1-1]%20A09_1002.pdf

http://oce.jpl.nasa.gov/practices/2210.pdf

I hope you find the usefu

Dear Gokul Kannan, probably, synthetic fibers are preferable because they allow to obtain better strength and physical properties of composites, including form stability under influence of humidity and moisture  than natural ones. 

Dear gokul,

       Most of the situation dish antenna placed in the open environment,so its undervent summer and winter season also,it might be go for synthetic fiber like glass,carbon....if possible make coating( paint) on the Antenna surface

Dear gogul better go for synthetic  fibre.For better strength and stable in environment as well as contact properties are required so go for carbon fibre

Dear Gyorgy Banhegyi, thanks for your valuable suggestions its very helpful......

Dear Serge V. Shil’ko, thank you for valuable answer....

Dear R. Prithivirajan, thanks for your helpful conversation....