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If the whole earth is to be connected by line of sight communication using space waves (no restriction of antenna size or tower height). What is the minimum number of antennas required? |
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Answer» 2  `d_(m)^(2)=(R+h_(T))^(2)+(R+h_(T))^(2)=2(R+h_(T))^(2)` As `d_(m)=sqrt(2h_(T)R)+sqrt(2h_(T)R)=2sqrt(2h_(T)R)` `therefore 8h_(T)R=2(R+h_(T))^(2)` or `4h_(T)=R^(2)+2Rh_(T)+h_(T)^(3)` or `R^(2)-2h_(T)R+h_(T)^(2)` or `R^(2)-2h_(T)R+h_(T)^(3)` or `(R-h_(T))^(3)=0` or `R=h_(T)` |
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