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+//Chapter-9 example 11
+//=============================================================================
+clc;
+clear;
+//input data
+F     = 10*10^9;//radar operating frequency in hz
+Vo    = 3*10^8;//velocity of EM wave in m/s
+IE    =0.6;//illumination efficiency
+Da    =12;//diameter of antenna
+//Calculations
+lamda = Vo/F;//wavelength
+Gp    = IE*(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==============================================