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+//Chapter-9 example 2
+//=============================================================================
+clc;
+clear;
+//input data
+Da    = 2.5;//diameter of parabolic antenna in m
+F     = 5*10^9;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+
+//Calculations
+lamda = Vo/F;//wavelength
+Gp    = 6.4*(Da/lamda)^2//gain of parabolic reflector
+G     = 10*log10(Gp)//gain in dB
+//Output
+mprintf('Gain of parabolic reflector is %3.2f dB',G);
+
+//=============end of the program==============================================