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+//Chapter-9 example 15
+//=============================================================================
+clc;
+clear;
+//input data
+//Da = 6*lamda;
+
+//Calculations
+
+//Gp  = 6.4*(Da/lamda)^2; //power gain 
+
+//Gp  = 6.4*(6*lamda/lamda)^2 //power gain of parabolic reflector
+Gp    =6.4*(6)^2;
+G     = 10*log10(Gp)//gain in dB
+
+
+//Output
+mprintf('Gain of parabolic reflector is %3.2f dB\n',G);
+
+//=============end of the program==============================================